puppeteer: wait N seconds before continuing to the next line

Question

In puppeteer I would like to wait a defined time before going to the next line of code.

I've tried to put a setTimeout in an evaluate function but it seems to be simply ignored

console.log('before waiting'); await page.evaluate(async() => {   setTimeout(function(){       console.log('waiting');   }, 4000) }); console.log('after waiting'); 

This code don't wait and just write before waiting and after waiting

Do you know how to do this?

Answer 1

You can use a little promise function,

function delay(time) {    return new Promise(function(resolve) {         setTimeout(resolve, time)    }); } 

Then, call it whenever you want a delay.

console.log('before waiting'); await delay(4000); console.log('after waiting'); 

If you must use puppeteer use the builtin waitForTimeout function.

await page.waitForTimeout(4000) 

If you still want to use page.evaluate, resolve it after 4 seconds. You are not resolving anything.

await page.evaluate(async() => {     await new Promise(function(resolve) {             setTimeout(resolve, 1000)     }); }); 

But I guess you can simply use the first two examples.