SELECT BOX MULTIPLE

Greenster · Apr 18, 2002

In Javascript I am looping thru a SELECT MULTIPLE form, I either want to find out the total number of options in this select box or have a check hwich says:

IF ISSET (document.mainform.did_multiple.value){
do some stuff
}

Any help would be appreciated

Thanx
{Greenster}

kevinclark · Apr 18, 2002

This sample (cut and paste into new html page) will tell you how many options there are, how many are selected and perform a logical check on the selections.
Hope it will help

<BODY>
<form name="F1" >
<select size="5" name="D2" onChange="testme2();" multiple>
<option>Line1</option>
<option>Line2</option>
<option>Line3</option>
<option>Line4</option>
<option>Line5</option>
<option>Line6</option>
<option>Line7</option>
<option>Line8</option>
<option>Line9</option>

</select>
</Form>

<Script language="JavaScript">
function testme2()
{
var MyVar;
MyVar = 0;
alert("Total Options = " + document.F1.D2.options.length);
for (var i = 0; i < document.F1.D2.options.length; i++)
{
if (document.F1.D2.selected)
{
MyVar = MyVar + 1;
if (document.F1.D2.text == "Line3&quot
{
alert("Line" + (i+1) + " selected - Do some stuff"
}
}
}
alert("Total Options Selected = " + MyVar);
}
</Script>
</Body>

starway · Apr 18, 2002

Here it is:

<script>
function getSelected(obj) {
var count = 0;
var returnList = '';

for (var current=0; current < obj.options.length; current++)
{
if (obj.options[current].selected)
{
count++;
returnList += '[ ' + current + ' ] ';
}
}

alert(count + ' selected items from ' + obj.options.length + '\n' + returnList);
}
</script>

<body>
<form>
. . .
<select name="mySelect" multiple>
. . .
</select>

<input type=button value="get selected" onclick=getSelected(this.form.mySelect)>
</form>
</body>

Alert box will show total number of selected options and their order numbers in options array.

good luck

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SELECT BOX MULTIPLE

Greenster

Programmer

kevinclark

Programmer

starway

Programmer

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