How to restrict characters in the asp.net textbox

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How to restrict characters in the asp.net textbox
i wrote the script but its not working,
whats wrong in the following code

JavaScript

function numberonly(event)
{
var numonly=(event.which) ? event.which : event.keyCode
if(numonly > 31 && (numonly < 97 || numonly > 122))
return true;         
return false;
}

Posted 20-Aug-10 2:13am

venubabu k

Updated 20-Aug-10 2:34am

Prosanta Kundu online

v2

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R. Giskard Reventlov 20-Aug-10 8:24am

You need to format the question and give a better title than your name or you'll never get an answer.

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CPallini · Answer 1 · 2010-08-20T02:34:00

Solution 1

What is supposed to do your function?
if you want just digits then why don't you use the Char.IsDigit [^] method?
:)

Posted 20-Aug-10 2:34am

CPallini

Yusuf · Answer 2 · 2010-08-20T04:19:00

Well Here is how I did it. You need to modify it to suit your needs

function allowOnlyDigit(evt, obj)
  {
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode == 45 ) 
    {
      var val = obj.value;      
      if(val.length > 0)
        return false;      
    }  
    else if (charCode > 31 && (charCode < 48) || (charCode > 57))
    {
      return false;
    }        
    return true;
  }

onkeypress="return allowOnlyDigit(event, this)"

Aggarwal Jatin · Answer 3 · 2010-08-20T04:37:00

You can use following JS Function :

function DisableSplChars(e) 
{
    var keynum
    var keychar
    var numcheck
    // For Internet Explorer
    if (window.event)
    {
        keynum = e.keyCode
    }
    // For Netscape/Firefox/Opera
    else if (e.which)
    {
        keynum = e.which
    }
    keychar = String.fromCharCode(keynum)
    //List of special characters you want to restrict
    if (keychar == "!" || keychar == "@" || keychar == "#"  
    || keychar == "$" || keychar == "%" || keychar == "^" || keychar == "&"
    || keychar == "*" || keychar == "(" || keychar == ")" 
    || keychar == "<" || keychar == ">")
    {
        return false;
    }
    else 
    {
        return true;
    }
}

And on Textbox you can call this javascript function

onkeypress="javascript:return DisableSplChars(event);"

How to restrict characters in the asp.net textbox

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