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Editorial Team
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Asked: 2026-05-16T22:11:00+00:00

The alert is showing, but the value is not changing…. why? <html> <head> <title>Test

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The alert is showing, but the value is not changing…. why?

<html>
    <head>
        <title>Test EuDock</title>
    </head>
    <body >
        <label id="labelID">test</label>
        <script type="text/javascript" >

            document.onkeyup = KeyCheck;

            function KeyCheck(e) {

                var KeyID = (window.event) ? event.keyCode : e.keyCode;

                switch(KeyID)
                {
                    case 39: // right arrow
                        document.getElementById('labelID').value="BLZ";
                        alert('ok');
                        break;
                }

            }
        </script>
    </body>
</html>
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1 Answer

  1. Editorial Team

    Only input elements have the property value. You want innerHTML :

    document.getElementById('labelID').innerHTML="BLZ";

    innerHTML is the only attribute that is supported by all browsers.

    innerText is not supported by Firefox and textContent is not supported by <= IE8.

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