Cross-browser: detect blur event on window

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挽巷
挽巷 2021-02-08 03:24

I just read, I think all the thread that deals with this subject, and I can\'t find a real solution to my problem. I need to detect when the browser window loses its focus, i.e.

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  • 2021-02-08 03:42

    You can use jQuery's blur method on window, like so:

    $(document).ready(function() {
      $(window).blur(function() {
        // Put your blur logic here
        alert("blur!");
      });
    });
    

    This works in Firefox, IE, Chrome and Opera.

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  • 2021-02-08 03:44

    The document.hasFocus (MDN) is an implementation that can resolve the problem with Firefox, but in Opera it isn't supported. So, a combined approach can reach out the problem you are facing.

    The function below exemplifies how can you use this method:

    function getDocumentFocus() {
        return document.hasFocus();
    }
    

    Since your question isn't clear enough about the application (timed, pub/sub system, event driven, etc), you can use the function above in several ways.

    For example, a timed verification can be like the one implemented on this fiddle (JSFiddle).

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  • 2021-02-08 03:49

    I tried using the addEventListener DOM function

    window.addEventListener('blur', function(){console.log('blur')});
    window.addEventListener('click', function(event){console.log(event.clientX)});
    

    I got it to work after the first blur. but it didnt work when I didnt have the click function attached to it. There might be some kind of refresh that happens when a click function is interpreted

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  • 2021-02-08 03:53

    It appears that jQuery no longer supports these tests for FireFox:

    • jQuery bug ticket is here: http://bugs.jquery.com/ticket/13363
    • jQuery close/deprecation commit is here: https://github.com/jquery/jquery/pull/1423

    I am searching for a better way to support Firefox blur eventing, but until I find a better approach, this is a more current status relative to the original accepted answer.

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  • 2021-02-08 03:57

    I tried both:

    document.addEventListener('blur', function(){console.log('blur')});
    

    and

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

    and they both worked in my version of FF (33.1).

    Here's the jsfiddle: http://jsfiddle.net/hzdd06eh/

    Click inside the "run" window and then click outside it to trigger the effect.

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  • 2021-02-08 04:03

    Here is an alternative solution to your question but it uses the Page Visibility API and Solution is Cross Browser compatible.

    (function() {
        var hidden = "hidden";
    
        // Standards:
        if (hidden in document)
            document.addEventListener("visibilitychange", onchange);
        else if ((hidden = "mozHidden") in document)
            document.addEventListener("mozvisibilitychange", onchange);
        else if ((hidden = "webkitHidden") in document)
            document.addEventListener("webkitvisibilitychange", onchange);
        else if ((hidden = "msHidden") in document)
            document.addEventListener("msvisibilitychange", onchange);
        // IE 9 and lower:
        else if ("onfocusin" in document)
            document.onfocusin = document.onfocusout = onchange;
        // All others:
        else
            window.onpageshow = window.onpagehide = window.onfocus = window.onblur = onchange;
    
        function onchange(evt) {
            var v = "visible",
                h = "hidden",
                evtMap = {
                    focus: v,
                    focusin: v,
                    pageshow: v,
                    blur: h,
                    focusout: h,
                    pagehide: h
                };
    
            evt = evt || window.event;
            if (evt.type in evtMap) {
                console.log(evtMap[evt.type]);
            } else {
    
                console.log(this[hidden] ? "hidden" : "visible");
            }
        }
    
        // set the initial state (but only if browser supports the Page Visibility API)
        if (document[hidden] !== undefined)
            onchange({
                type: document[hidden] ? "blur" : "focus"
            });
    })();
    
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