Inject jQuery into Puppeteer page

Question

I'm trying to inject jQuery into my Puppeteer page because document.querySelector doesn't cut it for me:

async function inject_jquery(page){   await page.evaluate(() => {     var jq = document.createElement("script")     jq.src = "https://code.jquery.com/jquery-3.2.1.min.js"     document.querySelector("head").appendChild(jq)   })   const watchDog = page.waitForFunction('window.jQuery !== undefined');   await watchDog; } 

The result is it mostly times out. Does anyone have a solution?

Answer 1

I have used page.addScriptTag to inject js files.

... await page.addScriptTag({url: 'https://code.jquery.com/jquery-3.2.1.min.js'}) ... 

page.addScriptTag - documentation

Working example using puppeteer: 0.12.0

import { launch } from 'puppeteer' (async () => {     const browser = await launch({headless: false});     const page = await browser.newPage();     await page.goto('https://example.com', {waitUntil: 'networkidle'});     await page.addScriptTag({url: 'https://code.jquery.com/jquery-3.2.1.min.js'});     await page.close();     await browser.close(); })(); 

Answer 2

For those looking to inject a local copy of jQuery:

await page.addScriptTag({path: require.resolve('jquery')})