| Author: lakshya 05 Nov 2009 | Member Level: Gold | Rating:  Points: 2 |
<script type="text/javascript">
function validate()
{
var obj = document.getElementById('<%=ListBox1.ClientID %>');
var sel =obj.selectedIndex;
if(sel==-1)
{
alert("Must select at least one value");
return false;
}
}
</script>
Happy dotneting Spread Smiles :-)
Visit Lakshya
|
| Author: Venkatesh Kumar 18 Nov 2009 | Member Level: Silver | Rating: Points: 2 |
Hi,
Try this code,
<script type="text/javascript">
function selectMultiple()
{
var myArray="";
try
{
for (var i=0; i<document.getElementById('mySelect').options.length; i++)
{
if (document.getElementById('mySelect').options[i].selected == true)
{
//alert(document.getElementById('mySelect').options[i].text);
myArray += document.getElementById('mySelect').options[i].text + ";";
}
}
var resArray = myArray.split(";");
if(resArray.length<=1)
alert("Please select the values in the list");
else
alert("You have selected = "+(resArray.length-1));
}
catch(e)
{
alert(e.message);
}
}
</script>
</head>
<body><form>
<select name="mySelect" size="10" multiple>
<option>Apple</option>
<option>Pear</option>
<option>Pea</option>
<option>Banana</option>
<option>Orange</option>
<option>Mango</option>
<option>Lime</option>
<option>Goa</option>
<option>Dates</option>
</select>
<input type="button" onclick="selectMultiple()" value="Select multiple">
</form></body>
</html>
Regards,
Venkatesh
|