JavaScript Cancel on Prompt

Question

Hi I was wondering what the difference between the prompt() method and confirm() methods are?

and also: I was wondering how to modify the following code, so that when the user cancels the prompt box, a block of code is executed.

var userInput = prompt("Write your name","");
if(prompt == //user cancels//){
code to be executed;
}

Thanks.

This question is already answered here [link](http://stackoverflow.com/questions/6962718/javascript-prompt-box-cancel-button) — Amol Bais, Jul 18 '16 at 06:41

Yeldar Kurmangaliyev · Accepted Answer · 2016-07-18T06:41:18.487

If user cancels prompt, then it returns null.
Since null is falsy, you can simply check for !prompt:

var result = prompt("ask user something");
if (!result) {

};

However, in your case, it looks like you want confirm function.
The difference is that prompt is a text input dialog, which returns inputed string or null.
Confirm is Yes / No dialog, which returns true or false.

var result = confirm('Click Yes or No!');

// Both approaches are working, choose the one you like:
if (result) console.log('Yes (result)');
if (result === true) console.log('Yes (result === true)');

// Both approaches are working, choose the one you like:
if (!result) console.log('No (!result)');
if (result === false) console.log('No (result === false)');

score 1 · Answer 2 · answered Jul 18 '16 at 06:41

1

On Cancel null is returned

 var a = prompt("ask user something", "")
    if (a === null) {
      alert(' Cancel pressed')
    }

JSFIDDLE

answered Jul 18 '16 at 06:41

brk

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JavaScript Cancel on Prompt

2 Answers2