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Editorial Team
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Asked: 2026-05-22T18:50:10+00:00

Can you explain me how can I enable/disable a text box (that means, can

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Can you explain me how can I enable/disable a text box (that means, can or cannot be edit) depending on a combobox?
If the combobox value = 1 -> textbox enable; if combobox = 0 -> textbox disable.

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1 Answer

  1. Editorial Team

    You want to use the onchange event of the select element. Here’s an example:

    <html>
<head>
<script type="text/javascript">
function select1changed()
{
    var select1 = document.getElementById('select1');
    var txt1 = document.getElementById('txt1');
    txt1.disabled = (select1.value == '0');
}
</script>
</head>
<body>
    <form>
    Combo: 
    <select id="select1" onchange="select1changed();">
        <option value="0">Option 0</option>
        <option value="1">Option 1</option>
    </select>
    Text: <input id="txt1" type="text" value="sometext" disabled="disabled" />
    </form>
</body>

    Note: I marked txt1 as disabled to handle the initial state when the page is loaded and select1 is set to Option 0.

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