exposed function queryseldtcor not working in puppeteer

Question

document.querySelectorAll(\'.summary\').innerText;

this throws error in below snippet saying \"document.querySelector is not a function\" in my pup

Answer 1

I just had the same question. The problem is that the page.evaluate() function callback has to be an async function and your function docTest() will return a Promise when called inside the page.evaluate(). To fix it, just add the async and await keywords to your code:

await page.exposeFunction('docTest', docTest);

var result = await page.evaluate(async () => {
    var summary = await docTest(document);
    console.log(summary);
    return summary;
});

Just remember that page.exposeFunction() will make your function return a Promise, then, you need to use async and await. This happens because your function will not be running inside your browser, but inside your nodejs application.

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