如何限制asp.net文本框中的字符 [英] How to restrict characters in the asp.net textbox

问题描述

如何限制asp.net文本框中的字符
我写了脚本，但是不起作用，
以下代码有什么问题

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

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

推荐答案

应该怎么做?
如果您只想要数字，那为什么不使用Char.IsDigit [

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

好，这是我的操作方法.您需要对其进行修改以适合您的需求

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)"

您可以使用以下JS函数:

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 == "

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