Allow only numbers in Textbox not working : ASP.NET

Question

I need only numbers in textbox. This is the javascript code that I am using :

 function onlyNumbers(evt) {
     evt = (evt) ? evt : window.event;
     var charCode = (evt.which) ? evt.which : evt.keyCode;
     if (charCode > 31 && (charCode < 48 || charCode > 57)) {
         alert(charCode);
         return false;
     }
     return true;
 }

The ASP text box on which I am calling the above function is :

<asp:TextBox ID="txtArtCount" placeholder="Numeric" onKeypress="return onlyNumbers(event);" runat="server" Width="65px" CssClass="searchTextBoxes"></asp:TextBox>

I am using Internet Explorer8 browser. I checked in Chrome as well but it is not working.

On pressing key in textbox, alert is shown but the text gets typed in the textbox as well.

would you check and add the html source code extracting it after render? — mrsrizan
– mrsrizan, Commented Jan 15, 2015 at 6:33
ther's something wrong in rendering part , see answer and run snippet , reply if it works for you — Vishal Sharma
– Vishal Sharma, Commented Jan 15, 2015 at 6:41

Vishal Sharma · Accepted Answer · 2015-01-15 06:32:06Z

2

code works correctly , I used input type text instead asp one , check in view source if something renders incorrectly or not

function onlyNumbers(evt) {
     evt = (evt) ? evt : window.event;
     var charCode = (evt.which) ? evt.which : evt.keyCode;
     if (charCode > 31 && (charCode < 48 || charCode > 57)) {
         alert(charCode);
         return false;
     }
     return true;
 }

<input type="text" ID="txtArtCount" placeholder="Numeric" onKeypress="return onlyNumbers(event);" />

hope that helps !

answered Jan 15, 2015 at 6:32

Vishal Sharma

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