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Editorial Team
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Asked: 2026-05-27T18:27:22+00:00

Why does alert(p1) show null ? http://pastebin.com/VAKwwEge <!DOCTYPE html> <html> <head> <script type=text/javascript src=js/product.js></script>

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Why does alert(p1) show null?

http://pastebin.com/VAKwwEge

<!DOCTYPE html>
<html>
<head>
    <script type="text/javascript" src="js/product.js"></script>
</head>
<body>
    Device:<select id="device" name="device" style="width:250px;"> </select>                      Line:<select id="line" name="line" style="width:250px;"> </select>
</body>
</html>

window.onload = load();
function load() {
    var p1 = document.getElementById("device");
    var l1 = document.getElementById("line");
    alert(p1);
    alert(l1);
}
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1 Answer

  1. Editorial Team

    You need to change this line:

    window.onload = load();

    To read the following:

    window.onload = load;

    Note the difference, the first example will invoke the load() function, and assign its return value to window.onload, which of course will be undefined.

    The second example will assign the function itself to window.onload, which is what you want, and will alert [object HTMLSelectElement] (in Firefox anyways).

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