javascript - 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();
})();