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https://github.com/puppeteer/puppeteer
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44c15220f9
The ElementHandle.release feels related to ElementHandle.click. The dispose is a more clear name.
99 lines
3.1 KiB
JavaScript
99 lines
3.1 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 helper = require('./helper');
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class ElementHandle {
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/**
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* @param {!Connection} client
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* @param {!Object} remoteObject
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* @param {!Mouse} mouse
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*/
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constructor(client, remoteObject, mouse) {
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this._client = client;
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this._remoteObject = remoteObject;
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this._mouse = mouse;
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this._disposed = false;
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}
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/**
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* @return {!Promise}
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*/
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async dispose() {
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if (this._disposed)
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return;
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this._disposed = true;
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await helper.releaseObject(this._client, this._remoteObject);
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}
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/**
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* @param {function()} 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 evaluate(pageFunction, ...args) {
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console.assert(!this._disposed, 'ElementHandle is disposed!');
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console.assert(typeof pageFunction === 'function', 'First argument to ElementHandle.evaluate must be a function!');
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let stringifiedArgs = ['this'];
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stringifiedArgs.push(...args.map(x => JSON.stringify(x)));
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let functionDeclaration = `function() { return (${pageFunction})(${stringifiedArgs.join(',')}) }`;
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const objectId = this._remoteObject.objectId;
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let { exceptionDetails, result: remoteObject } = await this._client.send('Runtime.callFunctionOn', { objectId, functionDeclaration, returnByValue: false, awaitPromise: true});
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if (exceptionDetails)
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throw new Error('Evaluation failed: ' + helper.getExceptionMessage(exceptionDetails));
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return await helper.serializeRemoteObject(this._client, remoteObject);
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}
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/**
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* @return {!Promise<{x: number, y: number}>}
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*/
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async _visibleCenter() {
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let center = await this.evaluate(element => {
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if (!element.ownerDocument.contains(element))
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return null;
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element.scrollIntoViewIfNeeded();
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let rect = element.getBoundingClientRect();
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return {
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x: (Math.max(rect.left, 0) + Math.min(rect.right, window.innerWidth)) / 2,
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y: (Math.max(rect.top, 0) + Math.min(rect.bottom, window.innerHeight)) / 2
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};
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});
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if (!center)
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throw new Error('No node found for selector: ' + selector);
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return center;
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}
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/**
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* @return {!Promise}
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*/
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async hover() {
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let {x, y} = await this._visibleCenter();
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await this._mouse.move(x, y);
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}
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/**
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* @param {!Object=} options
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* @return {!Promise}
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*/
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async click(options) {
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let {x, y} = await this._visibleCenter();
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await this._mouse.click(x, y, options);
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}
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}
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module.exports = ElementHandle;
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helper.tracePublicAPI(ElementHandle);
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