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Asked: 2026-05-14T19:22:31+00:00

I am experimenting with HTML and JavaScript. The following code should print something when

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I am experimenting with HTML and JavaScript. The following code should print something when entering a keystroke in a textbox:

<html>
    <body>
        <input type="text" id="commandInput" name="command" size="50" />
        <script type="text/javascript">
            var commandInput = document.getElementById("commandInput");
            commandInput.onkeydown = function (evt) {
                document.writeln("Test");
            };
        </script>    

    </body>
</html>

For some reason the textbox disappears when entering a keystroke, leaving nothing but a white page.

Any ideas why this is happening?

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1 Answer

  1. Editorial Team

    You shouldn’t use document.write or document.writeln after the page has loaded. Calling it after the page has loaded (in Firefox, at least) does an automatic call to document.open(), which wipes out the current document.

    If you’re using it as a debugging tool, I’d suggest using Firebug and console.log() instead.

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