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Asked: 2026-05-24T20:01:32+00:00

I’m struggling to make the code blow work… Then, I’m wondering why window.focus() and

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I’m struggling to make the code blow work…

Then, I’m wondering why window.focus() and window.blur() methods are not working / only working from input button. They are not working when I call from setInterval().

For example, in the case below, when I push the button in HTML, it makes window at first time, and then focus the window from second time I press the button.

However, I also set setInterval() to make the window focus but it doesn’t work. I can see the log on console, so setInterval function works correctly but win.focus() is ignored by somehow.

<head>
...
    <script>
    var win;
    function makePopup(){
        if (!win || win.closed) {
            win = window.open("","","width=200, height=200");
            win.blur();
        }else{
            win.focus();
            console.log("opened");
        }
    }
    setInterval(function(){makePopup();},4000);
    </script>
</head>

<body>
    <input type="button" onclick="makePopup()"/>
</body>

So the problems are:

  1. window.blur() doesn’t work at all.
  2. window.focus() works only when I call makePopup() from the HTML button and doesn’t work from setInterval().

I’m testing in Chrome and Safari with Mac OSX.

If you could give me some suggestion, I really appreciate it.

Thanks in advance.

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1 Answer

  1. Editorial Team

    The browser knows the difference between someone clicking a link to open a pop-up and when it is triggered by a script. In order to prevent malicious activity many browsers prevent scripted pop-ups.

    By specifying a URL that is on the same domain as the hosted page, it should work.

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