Thread: dynamic fields

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    How do I use javascript to dynamically show form fields when a selection has been made from a drop-down menu? The fields can be one or many select boxes, radio boxes, text boxes, etc.
    Is this possible?
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    If you do not want to reload the page you can use select menus. If someone makes a choice in one list the other lists adjust accordingly. This is possible because you can dynamically add, remove or edit options in a select list by using JavaScript. There are a lot of tutorials available on-line that can help you with this. Probably Devshed has a tutorial on this topic.

    If you want to visually adjust other form elements you have to reload your page, with some additional parameters or use a frameset to have the intial choice in one frame and the rest of the form in another one. .

    Ramon Litjens
    Boradoli Web Design
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    Lets say you have a form named myForm and in that form you have a drop down menu as follows
    <select name="mySelect">
    <option value="value1">value1</option>
    <option value="value2">value2 plus some text</option>
    <option value="value3">value3</option>

    and you have a field you want the selcted copied to:
    <input type="text" name="myField">

    you the make a small script (remember to place it between the <head></head>-tags for good styles sake)

    <script language="javascript" type="text/javascript">
    function myFunction(theForm) {
    theForm.myField.value = theForm.mySelect.value;

    now all you need to do is to make the dropdown call the function. You do that by adding a bit of code to the <select>-tag:

    <select name="mySelect" onChange="myFunction(this.form)">

    You can also call it using onKeyUp, onkeypress etc.

    // Martin
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    I had the same problem.
    What I resorted to was executing a new cgi
    script when the change event occured.
    The cgi script then determined the contents
    of the new page and re-sent them.
    This method saves having to have multiple
    html pages that are all similar.

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