puppeteer/lib/ElementHandle.js
JoelEinbinder 60ba8c3af9 feat: add page.xpath (#1620)
This patch adds xpath support with the following methods:
- page.xpath
- frame.xpath
- elementHandle.xpath

Fixes #537
2017-12-19 16:23:45 -08:00

218 lines
5.9 KiB
JavaScript

/**
* Copyright 2017 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const path = require('path');
const {JSHandle} = require('./ExecutionContext');
const {helper, debugError} = require('./helper');
class ElementHandle extends JSHandle {
/**
* @param {!Puppeteer.ExecutionContext} context
* @param {!Puppeteer.Session} client
* @param {!Object} remoteObject
* @param {!Puppeteer.Page} page
*/
constructor(context, client, remoteObject, page) {
super(context, client, remoteObject);
this._client = client;
this._remoteObject = remoteObject;
this._page = page;
this._disposed = false;
}
/**
* @override
* @return {?ElementHandle}
*/
asElement() {
return this;
}
async _scrollIntoViewIfNeeded() {
const error = await this.executionContext().evaluate(element => {
if (!element.isConnected)
return 'Node is detached from document';
if (element.nodeType !== Node.ELEMENT_NODE)
return 'Node is not of type HTMLElement';
element.scrollIntoViewIfNeeded();
return false;
}, this);
if (error)
throw new Error(error);
}
/**
* @return {!Promise<{x: number, y: number}>}
*/
async _visibleCenter() {
await this._scrollIntoViewIfNeeded();
const box = await this.boundingBox();
if (!box)
throw new Error('Node is not visible');
return {
x: box.x + box.width / 2,
y: box.y + box.height / 2
};
}
async hover() {
const {x, y} = await this._visibleCenter();
await this._page.mouse.move(x, y);
}
/**
* @param {!Object=} options
*/
async click(options = {}) {
const {x, y} = await this._visibleCenter();
await this._page.mouse.click(x, y, options);
}
/**
* @param {!Array<string>} filePaths
* @return {!Promise}
*/
async uploadFile(...filePaths) {
const files = filePaths.map(filePath => path.resolve(filePath));
const objectId = this._remoteObject.objectId;
return this._client.send('DOM.setFileInputFiles', { objectId, files });
}
async tap() {
const {x, y} = await this._visibleCenter();
await this._page.touchscreen.tap(x, y);
}
async focus() {
await this.executionContext().evaluate(element => element.focus(), this);
}
/**
* @param {string} text
* @param {{delay: (number|undefined)}=} options
*/
async type(text, options) {
await this.focus();
await this._page.keyboard.type(text, options);
}
/**
* @param {string} key
* @param {!Object=} options
*/
async press(key, options) {
await this.focus();
await this._page.keyboard.press(key, options);
}
/**
* @return {!Promise<?{x: number, y: number, width: number, height: number}>}
*/
async boundingBox() {
const result = await this._client.send('DOM.getBoxModel', {
objectId: this._remoteObject.objectId
}).catch(error => void debugError(error));
if (!result)
return null;
const quad = result.model.border;
const x = Math.min(quad[0], quad[2], quad[4], quad[6]);
const y = Math.min(quad[1], quad[3], quad[5], quad[7]);
const width = Math.max(quad[0], quad[2], quad[4], quad[6]) - x;
const height = Math.max(quad[1], quad[3], quad[5], quad[7]) - y;
return {x, y, width, height};
}
/**
*
* @param {!Object=} options
* @returns {!Promise<Object>}
*/
async screenshot(options = {}) {
await this._scrollIntoViewIfNeeded();
const { layoutViewport: { pageX, pageY } } = await this._client.send('Page.getLayoutMetrics');
const boundingBox = await this.boundingBox();
if (!boundingBox)
throw new Error('Node is not visible');
const clip = Object.assign({}, boundingBox);
clip.x += pageX;
clip.y += pageY;
return await this._page.screenshot(Object.assign({}, {
clip
}, options));
}
/**
* @param {string} selector
* @return {!Promise<?ElementHandle>}
*/
async $(selector) {
const handle = await this.executionContext().evaluateHandle(
(element, selector) => element.querySelector(selector),
this, selector
);
const element = handle.asElement();
if (element)
return element;
await handle.dispose();
return null;
}
/**
* @param {string} selector
* @return {!Promise<!Array<!ElementHandle>>}
*/
async $$(selector) {
const arrayHandle = await this.executionContext().evaluateHandle(
(element, selector) => element.querySelectorAll(selector),
this, selector
);
const properties = await arrayHandle.getProperties();
await arrayHandle.dispose();
const result = [];
for (const property of properties.values()) {
const elementHandle = property.asElement();
if (elementHandle)
result.push(elementHandle);
}
return result;
}
/**
* @param {string} expression
* @return {!Promise<?ElementHandle>}
*/
async xpath(expression) {
const handle = await this.executionContext().evaluateHandle(
(element, expression) => {
const document = element.ownerDocument || element;
return document.evaluate(expression, element, null, XPathResult.FIRST_ORDERED_NODE_TYPE).singleNodeValue;
},
this, expression
);
const element = handle.asElement();
if (element)
return element;
await handle.dispose();
return null;
}
}
module.exports = ElementHandle;
helper.tracePublicAPI(ElementHandle);