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Validates an input field to make sure that only number is entered. If you enter letter it alert.

Label: Validation (Number)

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<script>
/*
You can use this script to check the numeric value of multiple fields with the sequnce number
i.e 
       for example there are two field to enter telephone number of a particular person;
                  checkNumber(1, "frmData", "Telephone")
                  checkNumber(2, "frmData", "Telephone")

If you want to check for just one field just pass null value to nCount field
ie checkNumber(null, "frmData", "Salary")
*/

function checkNumber(nCount, frmName, txtId)
	{
			var nText = eval("Number(document." + frmName + "." + txtId + "" + nCount + ".value)");							
			if (nText.toString() =='NaN')
			{
				alert('Invalid value,\nplease enter numeric value');
				eval("document." + frmName + "." + txtId + "" + nCount + ".value='';")
				eval("document." + frmName + "." + txtId + "" + nCount + ".focus();")
			}
		
	}
</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<form id="frmDetail" name="frmDetail">	
		<input type="text" id="Telephone1" name="Telephone1" onblur="Javascript: checkNumber(1, 'frmDetail', 'Telephone');" size="20">	
		<input type="text" id="Telephone2" name="Telephone2" onblur="Javascript: checkNumber(2, 'frmDetail', 'Telephone');" size="20">	
	</form>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->