Script Categories













Forms >>> No Duplicates.

Prevents you from selecting the same choice when choosing from two different pulldown menus.

Try to select the same color:

Add the below code to the <body> section of your page:

<script language="javascript" type="text/javascript">
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
var OptLstTxt = new Array;
var OptLstVal = new Array;
var OptLen = 0;
function NoDupl(SelObjFrom, SelObjTo) {
var OldToVal = SelObjTo.options[SelObjTo.selectedIndex].value;
if (OptLen == 0) {
OptLen = SelObjFrom.length;
for (var i = 1; i < OptLen; i++) {
OptLstTxt[i] = SelObjFrom.options[i].text;
OptLstVal[i] = SelObjFrom.options[i].value;
   }
}
var j = 1;
for (var i = 1; i < OptLen; i++) {
if (OptLstVal[i] != SelObjFrom.options[SelObjFrom.selectedIndex].value) {
if (j == SelObjTo.length) {
SelObjTo.options[j] = new Option(OptLstTxt[i]);
}
else {
SelObjTo.options[j].text = OptLstTxt[i];
}
SelObjTo.options[j].value = OptLstVal[i];
if (OptLstVal[i] == OldToVal) {
SelObjTo.selectedIndex = j;
}
j++;
   }
}
if (SelObjTo.length > j)
SelObjTo.options[(SelObjTo.length - 1)] = null;
}
//  End -->
</script>
<form method="POST" name="MForm">
Try to select the same color:
<br>
<
nobr>
<select name="Color_1" onChange="NoDupl(this,document.MForm.Color_2)">
<option
selected value=''>Select your first prefered color</option>
<option
value='R'>Red</option>
<option
value='J'>Yellow</option>
<option
value='G'>Green</option>
<option
value='B'>Blue</option>
</select>
<select
name="Color_2" onChange="NoDupl(this,document.MForm.Color_1)">
<option
selected value=''>Select Second Prefered color</option>
<option
value='R'>Red</option>
<option
value='J'>Yellow</option>
<option
value='G'>Green</option>
<option
value='B'>Blue</option>
</select>
</nobr>
</form>

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