how to validate textbox to accept only characters

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hi...
I am using RAD Text box..I want to check that if user is entering the value in text box it should only character allow spacing its OK. I want it through JavaScript and should display the message box for user that should" enter character only" all this functionality should happen on click of Submit Button...
thanks!!!!!

Posted 17-Aug-11 20:49pm

vivek_cool

Updated 21-Aug-17 22:53pm

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Prerak Patel · Answer 1 · 2011-08-17T20:55:00

JavaScript

<script>
function onkeydown(){
     var ch = String.fromCharCode(event.keyCode);
     var filter = /[a-zA-Z]/   ;
     if(!filter.test(ch)){
          event.returnValue = false;
     }
}
</script>

This can restrict the user to input only characters, but you still have to consider that user can paste numbers, or drag in into textbox.

koolprasad2003 · Answer 2 · 2011-08-17T21:07:00

Solution 2

Use event.keyCode to accept only char values.
write a function in javascript and call it on onkeypress event of Textbox

JavaScript

function checkNum()
{

if ((event.keyCode > 64 && event.keyCode < 91) || (event.keyCode > 96 && event.keyCode < 123) || event.keyCode == 8)
   return true;
else
   {
       alert("Please enter only char");
       return false;
   }

}

Posted 17-Aug-11 21:07pm

koolprasad2003

Comments

vivek_cool 18-Aug-11 3:28am

hey thanks
but i want to include space also.. how i can i do this.
i.e. space can allowed

Member 9286545 26-Jul-12 6:52am

need to pass some value to above function .,,,,,how it could be??

Member 9286545 26-Jul-12 6:53am

and what is event above?

Member 11512226 11-Mar-16 0:08am

it doesn't work when i have a text such that number is in between two letters

koolprasad2003 11-Mar-16 0:28am

this javascript method to be call 'onkeypress' event of textbox, so when you press some key (either number or letter) it should be work as expected, let me know what is the issue

Member 12991763 9-Feb-17 10:31am

how to accept only characters in html

koolprasad2003 11-Feb-17 5:46am

Above given solution will work in HTML also, just call onkeypress event of input box
Hope it helps