allow only numeric value in textbox using javascript

allow only numeric value in textbox using javascript

allow only numeric value in textbox using javascript

Hi Guys today we are going to learn how to allow only numeric in text box using JavaScript . 

just use the below codes to do that..

index.html

<script type="text/javascript">
function checnum(as)
 {
                var dd = as.value;
 if(isNaN(dd))
                {
                dd = dd.substring(0,(dd.length-1));
                as.value = dd;
                }
 }
</script>
<div align="center">
<h2>allow only numeric value in textbox using javascript</h2>
<b> Enter Number:</b> <input type="text" id="text1" onkeyup="checnum(this)" maxlength='20' /> 
</div>

That's is Guys how allow only numeric value in textbox using javascript..
Keep Visiting This blog for more Codes..Thank You...