CODEWITHSUNDEEP
javascript
Nick
Nick

Reputation: 45

Focus tab event Javascript

How I can detect when user focus in this tab and when user unfocus current tab I'm trying this code:

window.onfocus = function() {
    alert('Got focus');
}

Why this not work?

Upvotes: 2

Views: 7520

Answers (3)

GMchris
GMchris

Reputation: 5658

This IS the API for tracking when the current tab gains or loses focus. You can spell it like so, and it will work for almost all browsers. I suggest using the following syntax:

window.addEventListener('focus', function(e){
    console.log('Focused');
})

window.addEventListener('blur', function(e){
    console.log('Unfocused');
})

One reason I can think of for not firing the event is that you're mostly sitting in your browser console. Window does not receive focus or blue events if the dev tools are what you've actually "focused".

Upvotes: 0

Mahesh
Mahesh

Reputation: 1081

For particular HTML element..... 

 $("#elementId").focus(function(){
       //fire when element is focused...
  });
  $("#elementId").blur(function(){
      //fire when element is unfocused...
  });

For window.....

$(function() {
    $(window).focus(function() {
        console.log('Focus event');
    });

    $(window).blur(function() {
        console.log('un focus');
    });
});

Upvotes: 0

Mijamo
Mijamo

Reputation: 3516

The event you are looking for is visibilityChange https://developer.mozilla.org/en-US/docs/Web/Events/visibilitychange

When the event if fired, you can check if the page is visible or not through document[hidden]. See https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API for a working example.

Upvotes: 4

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