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POHiding and disabling elements based on a combobox's value with JavaScript
 

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  1. POHiding and disabling elements based on a combobox's value with JavaScript
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    <p>I have a page where, depending on whether the value of a combobox is false (no), an <code>input</code> box should be hidden and a <code>fieldset</code> disabled. When the combobox's value changes to true (yes), the form should show the <code>input</code> box and enable the <code>fieldset</code>.</p> <p>This is what I have so far:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;combo&lt;/title&gt; &lt;script language="javascript"&gt; function ToggleDisplay(Section, boolHide) { if (boolHide == true) { Section.style.display = "none"; } else { Section.style.display = ""; } } function disableElement(element, boolHide) { var input = document.getElementById(element).getElementsByTagName("input"); for(var i = 0; i &lt; input.length; i++) { input[i].setAttribute("disabled",boolHide); } } function hideShowElement(CurrentSection, OtherSection, DisableSection) { var sectionVal = CurrentSection.value; if (sectionVal == 0) { ToggleDisplay(OtherSection, true); //disableGroup (this.form, 'Radio1' , true); disableElement(DisableSection, "true"); } else { ToggleDisplay(OtherSection, false); //disableGroup (this.form, 'Radio1' , true); disableElement(DisableSection, "false"); } } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form name="testForm" action="" method="post"&gt; Show Hidden Text? &lt;select name="cmbYN" onchange="hideShowElement(this, MyDIV, 'OptionGrp1');"&gt; &lt;option value="0" selected="selected"&gt;&lt;/option&gt; &lt;option value="1"&gt;Yes&lt;/option&gt; &lt;option value="0"&gt;No&lt;/option&gt; &lt;/select&gt; &lt;div id="MyDIV" style="display: none"&gt; My Hidden Text: &lt;input name="Text1" type="text" /&gt; &lt;br&gt; &lt;/div&gt; &lt;fieldset id="OptionGrp1" name="Group1"&gt; Option Group&lt;br&gt;&lt;br&gt; Option 1&lt;input name="Radio1" type="radio" checked&gt; Option 2&lt;input name="Radio1" type="radio"&gt; &lt;/fieldset&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>This is hiding the <code>input</code> box and disabling the <code>fieldset</code>, but not re-enabling them.</p>
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    1. USRick
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    1. COPersonally I like adding/removing a class (like "hidden") because that gets around the sticky problem of having to figure out what the style was before you changed it. With a class, you leave the presentation (that is, the hiding/not hiding) to CSS.
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    2. COBut note that you can't enable/disable with CSS.
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      1. USPointy
 

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