c3a3bfe1d2
The PhantomJS has a similar callback called onInitialized. This callback passes control to the automation script when the page gets initialized. To precisely implement this functionality atop of puppeteer, and since puppeteer controller script lives in a separate process to the page, we need an ability to pause page at the moment of initialization. For now, we are not able to do this. However, oftentimes clients want to evaluate certain code in page at the point of page initialization. This patch implements this capability with the Page.evaluateOnInitilized method call. This patch also re-implements phantom's unrandomize.js example with the puppeteer API. This is serves an illustration purpose for the page.evaluateOnInitilized callback.
34 lines
1.1 KiB
JavaScript
34 lines
1.1 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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var Browser = require('../lib/Browser');
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var browser = new Browser();
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browser.newPage().then(async page => {
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await page.evaluateOnInitialized(function() {
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Math.random = () => 42 / 100;
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});
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var result = await page.navigate('http://ariya.github.com/js/random/');
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if (result) {
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console.log(await page.evaluate(function () {
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return document.getElementById('numbers').textContent;
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}));
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} else {
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console.log('Network error.');
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}
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browser.close();
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});
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