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Editorial Team
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Asked: 2026-05-20T09:29:54+00:00

var flag = 0/1 (default=1) I want this flag to checked every 30sec over

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var flag = 0/1 (default=1)
  • I want this flag to checked every 30sec over and over until the flag becomes 0 (by an external event that I cant control).
  • When the flag is 0 the 30sec-check should end until the flag is 1 again
  • As long as the flag is 0 some text should blink on the screen, if the flag goes back to 1 the blinking should stop and the 30sec check should continue.

I tried to do this with setTimeout/setInterval but Im having problem combining them with loops.

Here is some code doing the blinking from another site:

<html>
 <head>
 <script type="text/javascript">
  function init() {
    window.setInterval(blink,1000);
  }

  function blink() {
    var elm = document.getElementById('blinkDiv');
    if (elm.style.color == "#ff0000")
      elm.style.color = "#ffffff";
    else
      elm.style.color = "#ff0000";
  }
</script>
</head>
<body onload="init();" style="background-color: #ffffff;">
<div id="blinkDiv" style="color: #ff0000;">some text</div>
 </body>
</html>
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1 Answer

  1. Editorial Team

    Thanks for your answers I will try them. This is my own try that seems to work OK:

        <script type="text/javascript">

        function controller(){
            if(!f)
                setTimeout("blink();", 1000);
            else if(f)
                setTimeout("controller();", 30000);
        }

        function blink(){
            var elm = document.getElementById('alert');
            if (elm.style.color == "#ff0000")
              elm.style.color = "#ffffff";
            else
              elm.style.color = "#ff0000";

            controller();
        }

    </script>
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