mirror of
https://github.com/puppeteer/puppeteer
synced 2024-06-14 14:02:48 +00:00
cb684ebbc4
This patch: - introduces `page.waitForXPath` method - introduces `frame.waitForXPath` method - amends `page.waitFor` to treat strings that start with `//` as xpath queries. Fixes #1757.
879 lines
24 KiB
JavaScript
879 lines
24 KiB
JavaScript
/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const fs = require('fs');
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const EventEmitter = require('events');
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const {helper} = require('./helper');
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const {ExecutionContext, JSHandle} = require('./ExecutionContext');
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const ElementHandle = require('./ElementHandle');
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const readFileAsync = helper.promisify(fs.readFile);
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class FrameManager extends EventEmitter {
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/**
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* @param {!Puppeteer.CDPSession} client
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* @param {{frame: Object, childFrames: ?Array}} frameTree
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* @param {!Puppeteer.Page} page
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*/
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constructor(client, frameTree, page) {
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super();
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this._client = client;
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this._page = page;
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/** @type {!Map<string, !Frame>} */
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this._frames = new Map();
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/** @type {!Map<string, !ExecutionContext>} */
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this._contextIdToContext = new Map();
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this._client.on('Page.frameAttached', event => this._onFrameAttached(event.frameId, event.parentFrameId));
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this._client.on('Page.frameNavigated', event => this._onFrameNavigated(event.frame));
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this._client.on('Page.frameDetached', event => this._onFrameDetached(event.frameId));
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this._client.on('Runtime.executionContextCreated', event => this._onExecutionContextCreated(event.context));
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this._client.on('Runtime.executionContextDestroyed', event => this._onExecutionContextDestroyed(event.executionContextId));
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this._client.on('Runtime.executionContextsCleared', event => this._onExecutionContextsCleared());
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this._client.on('Page.lifecycleEvent', event => this._onLifecycleEvent(event));
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this._handleFrameTree(frameTree);
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}
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/**
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* @param {!Object} event
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*/
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_onLifecycleEvent(event) {
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const frame = this._frames.get(event.frameId);
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if (!frame)
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return;
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frame._onLifecycleEvent(event.loaderId, event.name);
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this.emit(FrameManager.Events.LifecycleEvent, frame);
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}
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/**
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* @param {{frame: Object, childFrames: ?Array}} frameTree
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*/
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_handleFrameTree(frameTree) {
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if (frameTree.frame.parentId)
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this._onFrameAttached(frameTree.frame.id, frameTree.frame.parentId);
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this._onFrameNavigated(frameTree.frame);
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if (!frameTree.childFrames)
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return;
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for (const child of frameTree.childFrames)
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this._handleFrameTree(child);
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}
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/**
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* @return {!Frame}
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*/
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mainFrame() {
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return this._mainFrame;
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}
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/**
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* @return {!Array<!Frame>}
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*/
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frames() {
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return Array.from(this._frames.values());
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}
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/**
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* @param {!string} frameId
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* @return {?Frame}
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*/
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frame(frameId) {
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return this._frames.get(frameId) || null;
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}
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/**
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* @param {string} frameId
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* @param {?string} parentFrameId
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* @return {?Frame}
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*/
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_onFrameAttached(frameId, parentFrameId) {
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if (this._frames.has(frameId))
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return;
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console.assert(parentFrameId);
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const parentFrame = this._frames.get(parentFrameId);
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const frame = new Frame(this._client, this._page, parentFrame, frameId);
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this._frames.set(frame._id, frame);
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this.emit(FrameManager.Events.FrameAttached, frame);
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}
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/**
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* @param {!Object} framePayload
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*/
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_onFrameNavigated(framePayload) {
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const isMainFrame = !framePayload.parentId;
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let frame = isMainFrame ? this._mainFrame : this._frames.get(framePayload.id);
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console.assert(isMainFrame || frame, 'We either navigate top level or have old version of the navigated frame');
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// Detach all child frames first.
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if (frame) {
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for (const child of frame.childFrames())
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this._removeFramesRecursively(child);
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}
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// Update or create main frame.
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if (isMainFrame) {
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if (frame) {
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// Update frame id to retain frame identity on cross-process navigation.
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this._frames.delete(frame._id);
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frame._id = framePayload.id;
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} else {
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// Initial main frame navigation.
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frame = new Frame(this._client, this._page, null, framePayload.id);
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}
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this._frames.set(framePayload.id, frame);
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this._mainFrame = frame;
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}
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// Update frame payload.
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frame._navigated(framePayload);
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this.emit(FrameManager.Events.FrameNavigated, frame);
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}
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/**
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* @param {string} frameId
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*/
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_onFrameDetached(frameId) {
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const frame = this._frames.get(frameId);
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if (frame)
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this._removeFramesRecursively(frame);
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}
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_onExecutionContextCreated(contextPayload) {
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const context = new ExecutionContext(this._client, contextPayload, this.createJSHandle.bind(this, contextPayload.id));
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this._contextIdToContext.set(contextPayload.id, context);
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const frame = context._frameId ? this._frames.get(context._frameId) : null;
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if (frame && context._isDefault)
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frame._setDefaultContext(context);
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}
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/**
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* @param {!ExecutionContext} context
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*/
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_removeContext(context) {
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const frame = context._frameId ? this._frames.get(context._frameId) : null;
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if (frame && context._isDefault)
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frame._setDefaultContext(null);
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}
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/**
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* @param {string} executionContextId
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*/
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_onExecutionContextDestroyed(executionContextId) {
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const context = this._contextIdToContext.get(executionContextId);
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if (!context)
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return;
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this._contextIdToContext.delete(executionContextId);
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this._removeContext(context);
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}
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_onExecutionContextsCleared() {
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for (const context of this._contextIdToContext.values())
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this._removeContext(context);
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this._contextIdToContext.clear();
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}
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/**
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* @param {string} contextId
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* @param {*} remoteObject
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* @return {!JSHandle}
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*/
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createJSHandle(contextId, remoteObject) {
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const context = this._contextIdToContext.get(contextId);
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console.assert(context, 'INTERNAL ERROR: missing context with id = ' + contextId);
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if (remoteObject.subtype === 'node')
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return new ElementHandle(context, this._client, remoteObject, this._page);
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return new JSHandle(context, this._client, remoteObject);
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}
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/**
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* @param {!Frame} frame
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*/
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_removeFramesRecursively(frame) {
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for (const child of frame.childFrames())
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this._removeFramesRecursively(child);
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frame._detach();
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this._frames.delete(frame._id);
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this.emit(FrameManager.Events.FrameDetached, frame);
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}
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}
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/** @enum {string} */
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FrameManager.Events = {
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FrameAttached: 'frameattached',
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FrameNavigated: 'framenavigated',
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FrameDetached: 'framedetached',
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LifecycleEvent: 'lifecycleevent'
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};
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/**
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* @unrestricted
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*/
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class Frame {
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/**
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* @param {!Puppeteer.CDPSession} client
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* @param {?Frame} parentFrame
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* @param {string} frameId
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*/
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constructor(client, page, parentFrame, frameId) {
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this._client = client;
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this._page = page;
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this._parentFrame = parentFrame;
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this._url = '';
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this._id = frameId;
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/** @type {?Promise<!ElementHandle>} */
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this._documentPromise = null;
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/** @type {?Promise<!ExecutionContext>} */
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this._contextPromise = null;
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this._contextResolveCallback = null;
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this._setDefaultContext(null);
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/** @type {!Set<!WaitTask>} */
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this._waitTasks = new Set();
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this._loaderId = '';
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/** @type {!Set<string>} */
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this._lifecycleEvents = new Set();
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/** @type {!Set<!Frame>} */
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this._childFrames = new Set();
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if (this._parentFrame)
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this._parentFrame._childFrames.add(this);
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}
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/**
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* @param {?ExecutionContext} context
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*/
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_setDefaultContext(context) {
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if (context) {
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this._contextResolveCallback.call(null, context);
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this._contextResolveCallback = null;
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for (const waitTask of this._waitTasks)
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waitTask.rerun();
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} else {
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this._documentPromise = null;
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this._contextPromise = new Promise(fulfill => {
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this._contextResolveCallback = fulfill;
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});
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}
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}
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/**
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* @return {!Promise<!ExecutionContext>}
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*/
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executionContext() {
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return this._contextPromise;
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}
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/**
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* @param {Function|string} pageFunction
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* @param {!Array<*>} args
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* @return {!Promise<*>}
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*/
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async evaluate(pageFunction, ...args) {
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const context = await this._contextPromise;
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return context.evaluate(pageFunction, ...args);
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}
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/**
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* @param {string} selector
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* @return {!Promise<?ElementHandle>}
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*/
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async $(selector) {
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const document = await this._document();
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const value = await document.$(selector);
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return value;
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}
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/**
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* @return {!Promise<!ElementHandle>}
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*/
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async _document() {
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if (this._documentPromise)
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return this._documentPromise;
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this._documentPromise = this._contextPromise.then(async context => {
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const document = await context.evaluateHandle('document');
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return document.asElement();
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});
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return this._documentPromise;
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}
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/**
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* @param {string} expression
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* @return {!Promise<!Array<!ElementHandle>>}
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*/
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async $x(expression) {
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const document = await this._document();
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const value = await document.$x(expression);
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return value;
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}
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/**
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* @param {string} selector
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* @param {Function|string} pageFunction
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* @param {!Array<*>} args
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* @return {!Promise<(!Object|undefined)>}
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*/
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async $eval(selector, pageFunction, ...args) {
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const elementHandle = await this.$(selector);
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if (!elementHandle)
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throw new Error(`Error: failed to find element matching selector "${selector}"`);
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const result = await this.evaluate(pageFunction, elementHandle, ...args);
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await elementHandle.dispose();
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return result;
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}
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/**
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* @param {string} selector
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* @param {Function|string} pageFunction
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* @param {!Array<*>} args
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* @return {!Promise<(!Object|undefined)>}
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*/
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async $$eval(selector, pageFunction, ...args) {
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const context = await this._contextPromise;
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const arrayHandle = await context.evaluateHandle(selector => Array.from(document.querySelectorAll(selector)), selector);
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const result = await this.evaluate(pageFunction, arrayHandle, ...args);
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await arrayHandle.dispose();
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return result;
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}
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/**
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* @param {string} selector
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* @return {!Promise<!Array<!ElementHandle>>}
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*/
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async $$(selector) {
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const document = await this._document();
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const value = await document.$$(selector);
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return value;
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}
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/**
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* @return {!Promise<String>}
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*/
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async content() {
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return await this.evaluate(() => {
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let retVal = '';
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if (document.doctype)
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retVal = new XMLSerializer().serializeToString(document.doctype);
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if (document.documentElement)
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retVal += document.documentElement.outerHTML;
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return retVal;
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});
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}
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/**
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* @param {string} html
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*/
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async setContent(html) {
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await this.evaluate(html => {
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document.open();
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document.write(html);
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document.close();
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}, html);
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}
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/**
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* @return {string}
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*/
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name() {
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return this._name || '';
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}
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/**
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* @return {string}
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*/
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url() {
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return this._url;
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}
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/**
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* @return {?Frame}
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*/
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parentFrame() {
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return this._parentFrame;
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}
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/**
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* @return {!Array.<!Frame>}
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*/
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childFrames() {
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return Array.from(this._childFrames);
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}
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/**
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* @return {boolean}
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*/
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isDetached() {
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return this._detached;
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}
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/**
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* @param {Object} options
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* @return {!Promise<!ElementHandle>}
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*/
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async addScriptTag(options) {
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if (typeof options.url === 'string') {
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const url = options.url;
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try {
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const context = await this._contextPromise;
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return (await context.evaluateHandle(addScriptUrl, url)).asElement();
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} catch (error) {
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throw new Error(`Loading script from ${url} failed`);
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}
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}
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if (typeof options.path === 'string') {
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let contents = await readFileAsync(options.path, 'utf8');
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contents += '//# sourceURL=' + options.path.replace(/\n/g, '');
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const context = await this._contextPromise;
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return (await context.evaluateHandle(addScriptContent, contents)).asElement();
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}
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if (typeof options.content === 'string') {
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const context = await this._contextPromise;
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return (await context.evaluateHandle(addScriptContent, options.content)).asElement();
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}
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throw new Error('Provide an object with a `url`, `path` or `content` property');
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/**
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* @param {string} url
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* @return {!Promise<!HTMLElement>}
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*/
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async function addScriptUrl(url) {
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const script = document.createElement('script');
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script.src = url;
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document.head.appendChild(script);
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await new Promise((res, rej) => {
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script.onload = res;
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script.onerror = rej;
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});
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return script;
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}
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/**
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* @param {string} content
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* @return {!HTMLElement}
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*/
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function addScriptContent(content) {
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const script = document.createElement('script');
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script.type = 'text/javascript';
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script.text = content;
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document.head.appendChild(script);
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return script;
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}
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}
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/**
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* @param {Object} options
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* @return {!Promise<!ElementHandle>}
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*/
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async addStyleTag(options) {
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if (typeof options.url === 'string') {
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const url = options.url;
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try {
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const context = await this._contextPromise;
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return (await context.evaluateHandle(addStyleUrl, url)).asElement();
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} catch (error) {
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throw new Error(`Loading style from ${url} failed`);
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}
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}
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if (typeof options.path === 'string') {
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let contents = await readFileAsync(options.path, 'utf8');
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contents += '/*# sourceURL=' + options.path.replace(/\n/g, '') + '*/';
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const context = await this._contextPromise;
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return (await context.evaluateHandle(addStyleContent, contents)).asElement();
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}
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if (typeof options.content === 'string') {
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const context = await this._contextPromise;
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return (await context.evaluateHandle(addStyleContent, options.content)).asElement();
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}
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throw new Error('Provide an object with a `url`, `path` or `content` property');
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/**
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* @param {string} url
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* @return {!Promise<!HTMLElement>}
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*/
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async function addStyleUrl(url) {
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const link = document.createElement('link');
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link.rel = 'stylesheet';
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link.href = url;
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document.head.appendChild(link);
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await new Promise((res, rej) => {
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link.onload = res;
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link.onerror = rej;
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});
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return link;
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}
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/**
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* @param {string} content
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* @return {!HTMLElement}
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*/
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function addStyleContent(content) {
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const style = document.createElement('style');
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style.type = 'text/css';
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style.appendChild(document.createTextNode(content));
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document.head.appendChild(style);
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return style;
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}
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}
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/**
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* @param {string} selector
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* @param {!Array<string>} values
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* @return {!Promise<!Array<string>>}
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*/
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async select(selector, ...values){
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for (const value of values)
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console.assert(helper.isString(value), 'Values must be strings. Found value "' + value + '" of type "' + (typeof value) + '"');
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return await this.$eval(selector, (element, values) => {
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if (element.nodeName.toLowerCase() !== 'select')
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throw new Error('Element is not a <select> element.');
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const options = Array.from(element.options);
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element.value = undefined;
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for (const option of options)
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option.selected = values.includes(option.value);
|
|
element.dispatchEvent(new Event('input', { 'bubbles': true }));
|
|
element.dispatchEvent(new Event('change', { 'bubbles': true }));
|
|
return options.filter(option => option.selected).map(option => option.value);
|
|
}, values);
|
|
}
|
|
|
|
/**
|
|
* @param {(string|number|Function)} selectorOrFunctionOrTimeout
|
|
* @param {!Object=} options
|
|
* @param {!Array<*>} args
|
|
* @return {!Promise}
|
|
*/
|
|
waitFor(selectorOrFunctionOrTimeout, options = {}, ...args) {
|
|
const xPathPattern = '//';
|
|
|
|
if (helper.isString(selectorOrFunctionOrTimeout)) {
|
|
const string = /** @type {string} */ (selectorOrFunctionOrTimeout);
|
|
if (string.startsWith(xPathPattern))
|
|
return this.waitForXPath(string, options);
|
|
return this.waitForSelector(string, options);
|
|
}
|
|
if (helper.isNumber(selectorOrFunctionOrTimeout))
|
|
return new Promise(fulfill => setTimeout(fulfill, selectorOrFunctionOrTimeout));
|
|
if (typeof selectorOrFunctionOrTimeout === 'function')
|
|
return this.waitForFunction(selectorOrFunctionOrTimeout, options, ...args);
|
|
return Promise.reject(new Error('Unsupported target type: ' + (typeof selectorOrFunctionOrTimeout)));
|
|
}
|
|
|
|
/**
|
|
* @param {string} selector
|
|
* @param {!Object=} options
|
|
* @return {!Promise}
|
|
*/
|
|
waitForSelector(selector, options = {}) {
|
|
return this._waitForSelectorOrXPath(selector, false, options);
|
|
}
|
|
|
|
/**
|
|
* @param {string} xpath
|
|
* @param {!Object=} options
|
|
* @return {!Promise}
|
|
*/
|
|
waitForXPath(xpath, options = {}) {
|
|
return this._waitForSelectorOrXPath(xpath, true, options);
|
|
}
|
|
|
|
/**
|
|
* @param {Function|string} pageFunction
|
|
* @param {!Object=} options
|
|
* @return {!Promise}
|
|
*/
|
|
waitForFunction(pageFunction, options = {}, ...args) {
|
|
const timeout = options.timeout || 30000;
|
|
const polling = options.polling || 'raf';
|
|
return new WaitTask(this, pageFunction, polling, timeout, ...args).promise;
|
|
}
|
|
|
|
/**
|
|
* @return {!Promise<string>}
|
|
*/
|
|
async title() {
|
|
return this.evaluate(() => document.title);
|
|
}
|
|
|
|
/**
|
|
* @param {string} selectorOrXPath
|
|
* @param {boolean} isXPath
|
|
* @param {!Object=} options
|
|
* @return {!Promise}
|
|
*/
|
|
_waitForSelectorOrXPath(selectorOrXPath, isXPath, options = {}) {
|
|
const timeout = options.timeout || 30000;
|
|
const waitForVisible = !!options.visible;
|
|
const waitForHidden = !!options.hidden;
|
|
const polling = waitForVisible || waitForHidden ? 'raf' : 'mutation';
|
|
return this.waitForFunction(predicate, {timeout, polling}, selectorOrXPath, isXPath, waitForVisible, waitForHidden);
|
|
|
|
/**
|
|
* @param {string} selectorOrXPath
|
|
* @param {boolean} isXPath
|
|
* @param {boolean} waitForVisible
|
|
* @param {boolean} waitForHidden
|
|
* @return {?Node|boolean}
|
|
*/
|
|
function predicate(selectorOrXPath, isXPath, waitForVisible, waitForHidden) {
|
|
const node = isXPath
|
|
? document.evaluate(selectorOrXPath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue
|
|
: document.querySelector(selectorOrXPath);
|
|
if (!node)
|
|
return waitForHidden;
|
|
if (!waitForVisible && !waitForHidden)
|
|
return node;
|
|
const element = /** @type {Element} */ (node.nodeType === Node.TEXT_NODE ? node.parentElement : node);
|
|
|
|
const style = window.getComputedStyle(element);
|
|
const isVisible = style && style.visibility !== 'hidden' && hasVisibleBoundingBox();
|
|
const success = (waitForVisible === isVisible || waitForHidden === !isVisible);
|
|
return success ? node : null;
|
|
|
|
/**
|
|
* @return {boolean}
|
|
*/
|
|
function hasVisibleBoundingBox() {
|
|
const rect = element.getBoundingClientRect();
|
|
return !!(rect.top || rect.bottom || rect.width || rect.height);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {!Object} framePayload
|
|
*/
|
|
_navigated(framePayload) {
|
|
this._name = framePayload.name;
|
|
this._url = framePayload.url;
|
|
}
|
|
|
|
/**
|
|
* @param {string} loaderId
|
|
* @param {string} name
|
|
*/
|
|
_onLifecycleEvent(loaderId, name) {
|
|
if (name === 'init') {
|
|
this._loaderId = loaderId;
|
|
this._lifecycleEvents.clear();
|
|
}
|
|
this._lifecycleEvents.add(name);
|
|
}
|
|
|
|
_detach() {
|
|
for (const waitTask of this._waitTasks)
|
|
waitTask.terminate(new Error('waitForFunction failed: frame got detached.'));
|
|
this._detached = true;
|
|
if (this._parentFrame)
|
|
this._parentFrame._childFrames.delete(this);
|
|
this._parentFrame = null;
|
|
}
|
|
}
|
|
helper.tracePublicAPI(Frame);
|
|
|
|
class WaitTask {
|
|
/**
|
|
* @param {!Frame} frame
|
|
* @param {Function|string} predicateBody
|
|
* @param {string|number} polling
|
|
* @param {number} timeout
|
|
* @param {!Array<*>} args
|
|
*/
|
|
constructor(frame, predicateBody, polling, timeout, ...args) {
|
|
if (helper.isString(polling))
|
|
console.assert(polling === 'raf' || polling === 'mutation', 'Unknown polling option: ' + polling);
|
|
else if (helper.isNumber(polling))
|
|
console.assert(polling > 0, 'Cannot poll with non-positive interval: ' + polling);
|
|
else
|
|
throw new Error('Unknown polling options: ' + polling);
|
|
|
|
this._frame = frame;
|
|
this._polling = polling;
|
|
this._timeout = timeout;
|
|
this._predicateBody = helper.isString(predicateBody) ? 'return ' + predicateBody : 'return (' + predicateBody + ')(...args)';
|
|
this._args = args;
|
|
this._runCount = 0;
|
|
frame._waitTasks.add(this);
|
|
this.promise = new Promise((resolve, reject) => {
|
|
this._resolve = resolve;
|
|
this._reject = reject;
|
|
});
|
|
// Since page navigation requires us to re-install the pageScript, we should track
|
|
// timeout on our end.
|
|
this._timeoutTimer = setTimeout(() => this.terminate(new Error(`waiting failed: timeout ${timeout}ms exceeded`)), timeout);
|
|
this.rerun();
|
|
}
|
|
|
|
/**
|
|
* @param {!Error} error
|
|
*/
|
|
terminate(error) {
|
|
this._terminated = true;
|
|
this._reject(error);
|
|
this._cleanup();
|
|
}
|
|
|
|
async rerun() {
|
|
const runCount = ++this._runCount;
|
|
/** @type {?JSHandle} */
|
|
let success = null;
|
|
let error = null;
|
|
try {
|
|
success = await (await this._frame.executionContext()).evaluateHandle(waitForPredicatePageFunction, this._predicateBody, this._polling, this._timeout, ...this._args);
|
|
} catch (e) {
|
|
error = e;
|
|
}
|
|
|
|
if (this._terminated || runCount !== this._runCount) {
|
|
if (success)
|
|
await success.dispose();
|
|
return;
|
|
}
|
|
|
|
// Ignore timeouts in pageScript - we track timeouts ourselves.
|
|
if (!error && await this._frame.evaluate(s => !s, success)) {
|
|
await success.dispose();
|
|
return;
|
|
}
|
|
|
|
// When the page is navigated, the promise is rejected.
|
|
// We will try again in the new execution context.
|
|
if (error && error.message.includes('Execution context was destroyed'))
|
|
return;
|
|
|
|
// We could have tried to evaluate in a context which was already
|
|
// destroyed.
|
|
if (error && error.message.includes('Cannot find context with specified id'))
|
|
return;
|
|
|
|
if (error)
|
|
this._reject(error);
|
|
else
|
|
this._resolve(success);
|
|
|
|
this._cleanup();
|
|
}
|
|
|
|
_cleanup() {
|
|
clearTimeout(this._timeoutTimer);
|
|
this._frame._waitTasks.delete(this);
|
|
this._runningTask = null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {string} predicateBody
|
|
* @param {string} polling
|
|
* @param {number} timeout
|
|
* @return {!Promise<*>}
|
|
*/
|
|
async function waitForPredicatePageFunction(predicateBody, polling, timeout, ...args) {
|
|
const predicate = new Function('...args', predicateBody);
|
|
let timedOut = false;
|
|
setTimeout(() => timedOut = true, timeout);
|
|
if (polling === 'raf')
|
|
return await pollRaf();
|
|
if (polling === 'mutation')
|
|
return await pollMutation();
|
|
if (typeof polling === 'number')
|
|
return await pollInterval(polling);
|
|
|
|
/**
|
|
* @return {!Promise<*>}
|
|
*/
|
|
function pollMutation() {
|
|
const success = predicate.apply(null, args);
|
|
if (success)
|
|
return Promise.resolve(success);
|
|
|
|
let fulfill;
|
|
const result = new Promise(x => fulfill = x);
|
|
const observer = new MutationObserver(mutations => {
|
|
if (timedOut) {
|
|
observer.disconnect();
|
|
fulfill();
|
|
}
|
|
const success = predicate.apply(null, args);
|
|
if (success) {
|
|
observer.disconnect();
|
|
fulfill(success);
|
|
}
|
|
});
|
|
observer.observe(document, {
|
|
childList: true,
|
|
subtree: true,
|
|
attributes: true
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* @return {!Promise<*>}
|
|
*/
|
|
function pollRaf() {
|
|
let fulfill;
|
|
const result = new Promise(x => fulfill = x);
|
|
onRaf();
|
|
return result;
|
|
|
|
function onRaf() {
|
|
if (timedOut) {
|
|
fulfill();
|
|
return;
|
|
}
|
|
const success = predicate.apply(null, args);
|
|
if (success)
|
|
fulfill(success);
|
|
else
|
|
requestAnimationFrame(onRaf);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {number} pollInterval
|
|
* @return {!Promise<*>}
|
|
*/
|
|
function pollInterval(pollInterval) {
|
|
let fulfill;
|
|
const result = new Promise(x => fulfill = x);
|
|
onTimeout();
|
|
return result;
|
|
|
|
function onTimeout() {
|
|
if (timedOut) {
|
|
fulfill();
|
|
return;
|
|
}
|
|
const success = predicate.apply(null, args);
|
|
if (success)
|
|
fulfill(success);
|
|
else
|
|
setTimeout(onTimeout, pollInterval);
|
|
}
|
|
}
|
|
}
|
|
|
|
module.exports = {FrameManager, Frame};
|