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Editorial Team
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Asked: 2026-05-27T01:17:21+00:00

I’m trying to find a function in JavaScript that is called everytime when a

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I’m trying to find a function in JavaScript that is called everytime when a <form> or <select> is created. Does anyone have a idea?

I want something like:

<body onload="jsFunction();">

More exactly, I need to make a <select> that will be included in many pages, and I want everytime this is loaded, to select one of it’s values based on a request variable. So the function that will make the selection must called from this included script and must be included in this script.

I’m using JSP on the server side

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1 Answer

  1. Editorial Team

    This makes no sense. Just set the whole selected attribute programmatically based on the request parameter. Here’s an example:

    <select name="foo">
    <option value="bar" ${param.foo == 'bar' ? 'selected' : ''}>Bar</option>
    <option value="baz" ${param.foo == 'baz' ? 'selected' : ''}>Baz</option>
    <option value="waa" ${param.foo == 'waa' ? 'selected' : ''}>Waa</option>
</select>

    or if you have it in a collection:

    <select name="foo">
  <c:forEach items="${foos}" var="foo">
    <option value="${foo}" ${param.foo == foo ? 'selected' : ''}>${foo}</option>
  </c:forEach>
</select>

    The same is true for normal inputs:

    <input type="text" name="bar" value="${fn:escapeXml(param.bar)}" />

    (the fn:escapeXml() is there to prevent XSS attacks)

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