Asynchronus functions

Question

When a window.alert() is called, the script shouldnt wait for the user input(clicking ok for example), it should continue.

How could I achieve that without using the setTimeout() function?

this.alert('Window')
console.log('Continue here, dont wait for user input on the "Window"')

• Rayon: alert is blocking.. Use some custom UI to display alert instead of window.alert
• Daniel A. White: you can't block in javascript.
• Thomas: @Faizy the keyword is modal box take a look at that topic.
• Thomas: @DanielA.White, try this console.time("alert"); alert("...waiting"); console.timeEnd("alert"); If you cannot block, the measured duration should be like < 1ms
• Daniel A. White: @Thomas you can't block other than those functions....

Answer 1

No. JavaScript is single threaded. You simply can't. Unless the user input hook is completed, thread pauses there.

You can just tweak/have the DOM look like an alert with styling (weird but ok).

Answer 2

The alert function will pause any further execution of javascript until the user clicks the OK button because the code all runs in a single thread.

You may find this question useful as it addresses the precise problem you are trying to overcome.

Prevent alert() from halting the execution of JavaScript

Answer 3

Since JavaScript runs on single thread, alert/prompt/confirm will pause the execution until response is received from user.

But there are ways you can prevent this:- 1. Use custom UI instead of browser's. 2. By using WebWorkers API 3. By using setTimeout/setInterval 4. By using requestNextFrame function