puppeteer/lib/Page.js

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/**
* 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.
*/
let fs = require('fs');
let EventEmitter = require('events');
let mime = require('mime');
let NetworkManager = require('./NetworkManager');
let Navigator = require('./Navigator');
let Dialog = require('./Dialog');
let EmulationManager = require('./EmulationManager');
let FrameManager = require('./FrameManager');
let Keyboard = require('./Keyboard');
let helper = require('./helper');
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class Page extends EventEmitter {
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/**
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* @param {!Connection} client
* @return {!Promise<!Page>}
*/
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static async create(client) {
await Promise.all([
client.send('Network.enable', {}),
client.send('Page.enable', {}),
client.send('Runtime.enable', {}),
client.send('Security.enable', {}),
]);
let userAgentExpression = helper.evaluationString(() => window.navigator.userAgent);
let {result:{value: userAgent}} = await client.send('Runtime.evaluate', { expression: userAgentExpression, returnByValue: true });
let frameManager = await FrameManager.create(client);
let networkManager = new NetworkManager(client, userAgent);
let page = new Page(client, frameManager, networkManager);
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// Initialize default page size.
await page.setViewport({width: 400, height: 300});
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return page;
}
/**
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* @param {!Connection} client
* @param {!FrameManager} frameManager
* @param {!NetworkManager} networkManager
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*/
constructor(client, frameManager, networkManager) {
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super();
this._client = client;
this._frameManager = frameManager;
this._networkManager = networkManager;
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/** @type {!Map<string, function>} */
this._inPageCallbacks = new Map();
this._keyboard = new Keyboard(this._client);
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this._screenshotTaskChain = Promise.resolve();
this._frameManager.on(FrameManager.Events.FrameAttached, event => this.emit(Page.Events.FrameAttached, event));
this._frameManager.on(FrameManager.Events.FrameDetached, event => this.emit(Page.Events.FrameDetached, event));
this._frameManager.on(FrameManager.Events.FrameNavigated, event => this.emit(Page.Events.FrameNavigated, event));
this._networkManager.on(NetworkManager.Events.Request, event => this.emit(Page.Events.Request, event));
this._networkManager.on(NetworkManager.Events.Response, event => this.emit(Page.Events.Response, event));
this._networkManager.on(NetworkManager.Events.RequestFailed, event => this.emit(Page.Events.RequestFailed, event));
this._networkManager.on(NetworkManager.Events.RequestFinished, event => this.emit(Page.Events.RequestFinished, event));
client.on('Page.loadEventFired', event => this.emit(Page.Events.Load));
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client.on('Runtime.consoleAPICalled', event => this._onConsoleAPI(event));
client.on('Page.javascriptDialogOpening', event => this._onDialog(event));
client.on('Runtime.exceptionThrown', exception => this._handleException(exception.exceptionDetails));
}
/**
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* @return {!Frame}
*/
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mainFrame() {
return this._frameManager.mainFrame();
}
/**
* @return {!Keyboard}
*/
get keyboard() {
return this._keyboard;
}
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/**
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* @return {!Array<!Frame>}
*/
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frames() {
return this._frameManager.frames();
}
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/**
* @param {?function(!InterceptedRequest)} interceptor
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*/
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async setRequestInterceptor(interceptor) {
return this._networkManager.setRequestInterceptor(interceptor);
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}
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/**
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* @param {string} url
* @return {!Promise}
*/
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async addScriptTag(url) {
return this.evaluate(addScriptTag, url);
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/**
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* @param {string} url
*/
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function addScriptTag(url) {
let script = document.createElement('script');
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script.src = url;
let promise = new Promise(x => script.onload = x);
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document.head.appendChild(script);
return promise;
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}
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}
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/**
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* @param {string} filePath
* @return {!Promise}
*/
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async injectFile(filePath) {
const contents = await new Promise((resolve, reject) => {
fs.readFile(filePath, 'utf8', (err, data) => {
if (err) return reject(err);
resolve(data);
});
});
return this._client.send('Runtime.evaluate', { expression: contents, returnByValue: true });
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}
/**
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* @param {string} name
* @param {function(?)} callback
*/
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async setInPageCallback(name, callback) {
if (this._inPageCallbacks[name])
throw new Error(`Failed to set in-page callback with name ${name}: window['${name}'] already exists!`);
this._inPageCallbacks[name] = callback;
let expression = helper.evaluationString(inPageCallback, name);
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await this._client.send('Page.addScriptToEvaluateOnLoad', { scriptSource: expression });
await this._client.send('Runtime.evaluate', { expression, returnByValue: true });
function inPageCallback(callbackName) {
window[callbackName] = async(...args) => {
const me = window[callbackName];
let callbacks = me['callbacks'];
if (!callbacks) {
callbacks = new Map();
me['callbacks'] = callbacks;
}
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const seq = (me['lastSeq'] || 0) + 1;
me['lastSeq'] = seq;
const promise = new Promise(fulfill => callbacks.set(seq, fulfill));
// eslint-disable-next-line no-console
console.debug('driver:InPageCallback', JSON.stringify({name: callbackName, seq, args}));
return promise;
};
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}
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}
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/**
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* @param {!Object} headers
* @return {!Promise}
*/
async setHTTPHeaders(headers) {
return this._networkManager.setHTTPHeaders(headers);
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}
/**
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* @return {!Object}
*/
httpHeaders() {
return this._networkManager.httpHeaders();
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}
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/**
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* @param {string} userAgent
* @return {!Promise}
*/
async setUserAgent(userAgent) {
return this._networkManager.setUserAgent(userAgent);
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}
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/**
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* @return {string}
*/
userAgent() {
return this._networkManager.userAgent();
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}
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/**
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* @param {!Object} exceptionDetails
*/
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async _handleException(exceptionDetails) {
let message = await helper.getExceptionMessage(this._client, exceptionDetails);
this.emit(Page.Events.PageError, new Error(message));
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}
async _onConsoleAPI(event) {
if (event.type === 'debug' && event.args.length && event.args[0].value === 'driver:InPageCallback') {
let {name, seq, args} = JSON.parse(event.args[1].value);
let result = await this._inPageCallbacks[name](...args);
let expression = helper.evaluationString(deliverResult, name, seq, result);
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this._client.send('Runtime.evaluate', { expression });
function deliverResult(name, seq, result) {
window[name]['callbacks'].get(seq)(result);
window[name]['callbacks'].delete(seq);
}
return;
}
let values = await Promise.all(event.args.map(arg => helper.serializeRemoteObject(this._client, arg)));
this.emit(Page.Events.Console, ...values);
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}
_onDialog(event) {
let dialogType = null;
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if (event.type === 'alert')
dialogType = Dialog.Type.Alert;
else if (event.type === 'confirm')
dialogType = Dialog.Type.Confirm;
else if (event.type === 'prompt')
dialogType = Dialog.Type.Prompt;
else if (event.type === 'beforeunload')
dialogType = Dialog.Type.BeforeUnload;
console.assert(dialogType, 'Unknown javascript dialog type: ' + event.type);
let dialog = new Dialog(this._client, dialogType, event.message);
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this.emit(Page.Events.Dialog, dialog);
}
/**
* @return {!string}
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*/
url() {
return this.mainFrame().url();
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}
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/**
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* @param {string} html
* @return {!Promise}
*/
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async setContent(html) {
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this.evaluate(html => {
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document.open();
document.write(html);
document.close();
}, html);
}
/**
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* @param {string} html
* @param {!Object=} options
* @return {!Promise<!Response>}
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*/
async navigate(url, options) {
const referrer = this._networkManager.httpHeaders()['referer'];
this._navigator = new Navigator(this._client, url, referrer, options);
return this.reload();
}
/**
* @return {!Promise<!Response>}
*/
async reload() {
if (!this._navigator)
return;
/** @type {!Map<string, !Response>} */
const responses = new Map();
const onResponse = response => responses.set(response.url, response);
this._networkManager.on(NetworkManager.Events.Response, onResponse);
try {
await this._navigator.navigate();
} finally {
this._networkManager.removeListener(NetworkManager.Events.Response, onResponse);
}
const response = responses.get(this.mainFrame().url());
console.assert(response);
// Await for a single raf rountrip to ensure basic rasterization is complete.
await this.evaluate(() => new Promise(fulfill => requestAnimationFrame(fulfill)));
return response;
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}
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/**
* @param {!Page.Viewport} viewport
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* @return {!Promise}
*/
async setViewport(viewport) {
const needsReload = await EmulationManager.emulateViewport(this._client, viewport);
this._viewport = viewport;
if (needsReload)
await this.reload();
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}
/**
* @return {!Page.Viewport}
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*/
viewport() {
return this._viewport;
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}
/**
* @return {!Promise<!Array<string>>}
*/
static emulatedDevices() {
return EmulationManager.deviceNames(name);
}
/**
* @param {string} name
* @param {!Object=} options
* @return {!Promise}
*/
emulate(name, options) {
return Promise.all([
this.setUserAgent(EmulationManager.deviceUserAgent(name)),
this.setViewport(EmulationManager.deviceViewport(name, options))
]);
}
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/**
* @param {function()} pageFunction
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* @param {!Array<*>} args
* @return {!Promise<(!Object|undefined)>}
*/
async evaluate(pageFunction, ...args) {
return this._frameManager.mainFrame().evaluate(pageFunction, ...args);
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}
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/**
* @param {function()} pageFunction
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* @param {!Array<*>} args
* @return {!Promise}
*/
async evaluateOnInitialized(pageFunction, ...args) {
let scriptSource = helper.evaluationString(pageFunction, ...args);
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await this._client.send('Page.addScriptToEvaluateOnLoad', { scriptSource });
}
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/**
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* @param {!Object=} options
* @return {!Promise<!Buffer>}
*/
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async screenshot(options) {
options = options || {};
let screenshotType = null;
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if (options.path) {
let mimeType = mime.lookup(options.path);
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if (mimeType === 'image/png')
screenshotType = 'png';
else if (mimeType === 'image/jpeg')
screenshotType = 'jpeg';
console.assert(screenshotType, 'Unsupported screenshot mime type: ' + mimeType);
}
if (options.type) {
console.assert(!screenshotType || options.type === screenshotType, `Passed screenshot type '${options.type}' does not match the type inferred from the file path: '${screenshotType}'`);
console.assert(options.type === 'png' || options.type === 'jpeg', 'Unknown options.type value: ' + options.type);
screenshotType = options.type;
}
if (!screenshotType)
screenshotType = 'png';
if (options.quality) {
console.assert(screenshotType === 'jpeg', 'options.quality is unsupported for the ' + screenshotType + ' screenshots');
console.assert(typeof options.quality === 'number', 'Expected options.quality to be a number but found ' + (typeof options.quality));
console.assert(Number.isInteger(options.quality), 'Expected options.quality to be an integer');
console.assert(options.quality >= 0 && options.quality <= 100, 'Expected options.quality to be between 0 and 100 (inclusive), got ' + options.quality);
}
console.assert(!options.clip || !options.fullPage, 'options.clip and options.fullPage are exclusive');
if (options.clip) {
console.assert(typeof options.clip.x === 'number', 'Expected options.clip.x to be a number but found ' + (typeof options.clip.x));
console.assert(typeof options.clip.y === 'number', 'Expected options.clip.y to be a number but found ' + (typeof options.clip.y));
console.assert(typeof options.clip.width === 'number', 'Expected options.clip.width to be a number but found ' + (typeof options.clip.width));
console.assert(typeof options.clip.height === 'number', 'Expected options.clip.height to be a number but found ' + (typeof options.clip.height));
}
this._screenshotTaskChain = this._screenshotTaskChain.then(this._screenshotTask.bind(this, screenshotType, options));
return this._screenshotTaskChain;
}
/**
* @param {string} format
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* @param {!Object=} options
* @return {!Promise<!Buffer>}
*/
async _screenshotTask(format, options) {
if (options.fullPage) {
const metrics = await this._client.send('Page.getLayoutMetrics');
const width = Math.ceil(metrics.contentSize.width);
const height = Math.ceil(metrics.contentSize.height);
await this._client.send('Emulation.resetPageScaleFactor');
const mobile = this._viewport.isMobile || false;
const deviceScaleFactor = this._viewport.deviceScaleFactor || 1;
const landscape = this._viewport.isLandscape || false;
const screenOrientation = landscape ? { angle: 90, type: 'landscapePrimary' } : { angle: 0, type: 'portraitPrimary' };
await this._client.send('Emulation.setDeviceMetricsOverride', { mobile, width, height, deviceScaleFactor, screenOrientation });
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}
let clip = options.clip ? Object.assign({}, options['clip']) : undefined;
if (clip)
clip.scale = 1;
let result = await this._client.send('Page.captureScreenshot', { format, quality: options.quality, clip });
if (options.fullPage)
await this.setViewport(this._viewport);
let buffer = new Buffer(result.data, 'base64');
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if (options.path)
fs.writeFileSync(options.path, buffer);
return buffer;
}
/**
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* @param {string} filePath
* @param {!Object=} options
* @return {!Promise<!Buffer>}
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*/
async pdf(options) {
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options = options || {};
let scale = options.scale || 1;
let displayHeaderFooter = options.displayHeaderFooter || false;
let printBackground = options.printBackground || true;
let landscape = options.landscape || false;
let pageRanges = options.pageRanges || '';
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let paperWidth = 8.5;
let paperHeight = 11;
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if (options.format) {
let format = Page.PaperFormats[options.format];
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console.assert(format, 'Unknown paper format: ' + options.format);
paperWidth = format.width;
paperHeight = format.height;
} else {
paperWidth = convertPrintParameterToInches(options.width) || paperWidth;
paperHeight = convertPrintParameterToInches(options.height) || paperHeight;
}
let marginOptions = options.margin || {};
let marginTop = convertPrintParameterToInches(marginOptions.top) || 0;
let marginLeft = convertPrintParameterToInches(marginOptions.left) || 0;
let marginBottom = convertPrintParameterToInches(marginOptions.bottom) || 0;
let marginRight = convertPrintParameterToInches(marginOptions.right) || 0;
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let result = await this._client.send('Page.printToPDF', {
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landscape: landscape,
displayHeaderFooter: displayHeaderFooter,
printBackground: printBackground,
scale: scale,
paperWidth: paperWidth,
paperHeight: paperHeight,
marginTop: marginTop,
marginBottom: marginBottom,
marginLeft: marginLeft,
marginRight: marginRight,
pageRanges: pageRanges
});
let buffer = new Buffer(result.data, 'base64');
if (options.path)
fs.writeFileSync(options.path, buffer);
return buffer;
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}
/**
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* @return {!Promise<string>}
*/
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async plainText() {
return this.evaluate(() => document.body.innerText);
}
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/**
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* @return {!Promise<string>}
*/
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async title() {
return this.evaluate(() => document.title);
}
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/**
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* @return {!Promise}
*/
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async close() {
await this._client.dispose();
}
/**
* @param {string} selector
* @param {!Promise<number>}
*/
async _querySelector(selector) {
let {root} = await this._client.send('DOM.getDocument', { depth: 1 });
let {nodeId} = await this._client.send('DOM.querySelector', {
nodeId: root.nodeId,
selector
});
if (!nodeId)
throw new Error('No node found for selector: ' + selector);
return nodeId;
}
/**
* @param {string} selector
* @param {!Promise}
*/
async click(selector) {
let center = await this.evaluate(selector => {
let node = document.querySelector(selector);
if (!node)
return null;
let rect = node.getBoundingClientRect();
return {
x: (rect.left + rect.right) / 2,
y: (rect.top + rect.bottom) / 2
};
}, selector);
if (!center)
throw new Error('No node found for selector: ' + selector);
let x = Math.round(center.x);
let y = Math.round(center.y);
this._client.send('Input.dispatchMouseEvent', {
type: 'mouseMoved',
x, y
});
this._client.send('Input.dispatchMouseEvent', {
type: 'mousePressed',
button: 'left',
x, y,
clickCount: 1
});
await this._client.send('Input.dispatchMouseEvent', {
type: 'mouseReleased',
button: 'left',
x, y,
clickCount: 1
});
}
/**
* @param {string} selector
* @param {!Promise}
*/
async focus(selector) {
let success = await this.evaluate(selector => {
let node = document.querySelector(selector);
if (!node)
return false;
node.focus();
return true;
}, selector);
if (!success)
throw new Error('No node found for selector: ' + selector);
}
/**
* @param {string} text
* @param {!Promise}
*/
async type(text) {
return this._keyboard.type(text);
}
/**
* @param {string} selector
* @return {!Promise<undefined>}
*/
waitFor(selector) {
return this.mainFrame().waitFor(selector);
}
/**
* @param {string} selector
* @param {!Array<string>} filePaths
* @return {!Promise}
*/
async uploadFile(selector, ...filePaths) {
try {
const nodeId = await this._querySelector(selector);
await this._client.send('DOM.setFileInputFiles', { nodeId, files: filePaths });
} finally {
await this._client.send('DOM.disable');
}
}
/**
* @param {string} selector
* @param {function(!Element):T} pageFunction
* @param {!Array<*>} args
* @return {!Promise<?T>}
*/
async $(selector, pageFunction, ...args) {
return this.mainFrame().$(selector, pageFunction, ...args);
}
/**
* @param {string} selector
* @param {function(!Element):T} pageFunction
* @param {!Array<*>} args
* @return {!Promise<!Array<T>>}
*/
async $$(selector, pageFunction, ...args) {
return this.mainFrame().$$(selector, pageFunction, ...args);
}
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}
/** @enum {string} */
Page.PaperFormats = {
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Letter: {width: 8.5, height: 11},
Legal: {width: 8.5, height: 14},
Tabloid: {width: 11, height: 17},
Ledger: {width: 17, height: 11},
A0: {width: 33.1, height: 46.8 },
A1: {width: 23.4, height: 33.1 },
A2: {width: 16.5, height: 23.4 },
A3: {width: 11.7, height: 16.5 },
A4: {width: 8.27, height: 11.7 },
A5: {width: 5.83, height: 8.27 },
};
let unitToPixels = {
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'px': 1,
'in': 96,
'cm': 37.8,
'mm': 3.78
};
/**
* @param {(string|number|undefined)} parameter
* @return {(number|undefined)}
*/
function convertPrintParameterToInches(parameter) {
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if (typeof parameter === 'undefined')
return undefined;
let pixels;
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if (typeof parameter === 'number') {
// Treat numbers as pixel values to be aligned with phantom's paperSize.
pixels = /** @type {number} */ (parameter);
} else if (typeof parameter === 'string') {
let text = parameter;
let unit = text.substring(text.length - 2).toLowerCase();
let valueText = '';
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if (unitToPixels.hasOwnProperty(unit)) {
valueText = text.substring(0, text.length - 2);
} else {
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// In case of unknown unit try to parse the whole parameter as number of pixels.
// This is consistent with phantom's paperSize behavior.
unit = 'px';
valueText = text;
}
let value = Number(valueText);
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console.assert(!isNaN(value), 'Failed to parse parameter value: ' + text);
pixels = value * unitToPixels[unit];
} else {
throw new Error('page.pdf() Cannot handle parameter type: ' + (typeof parameter));
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}
return pixels / 96;
}
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Page.Events = {
Console: 'console',
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Dialog: 'dialog',
// Can'e use just 'error' due to node.js special treatment of error events.
// @see https://nodejs.org/api/events.html#events_error_events
PageError: 'pageerror',
Request: 'request',
Response: 'response',
RequestFailed: 'requestfailed',
RequestFinished: 'requestfinished',
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FrameAttached: 'frameattached',
FrameDetached: 'framedetached',
FrameNavigated: 'framenavigated',
Load: 'load',
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};
/** @typedef {{width: number, height: number, deviceScaleFactor: number|undefined, isMobile: boolean|undefined, isLandscape: boolean, hasTouch: boolean|undefined}} */
Page.Viewport;
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module.exports = Page;