如何验证只接受数字值的文本框? [英] how to validate the textbox that should accept only Numeric values?

问题描述

有人知道吗?

如何验证只接受数字值的文本框?

解决方案

在文本框上调用JS函数.为此，请使用以下代码:

 <   asp:textbox     id   ="     runat   =" 服务器" 宽度   150px"  onkeypress   ="   xmlns:asp   #未知"  >  <  /asp:textbox  >  

JS函数

 函数 isNumericWithDecimal(e)
{
    如果(((例如<  48  || e.which> 如果(例如==  8  || e.which ==  0 )
        {
            返回 真；
        }
        其他
        {
            返回 假；
        }
    }
} 

使用javascript之类的工具进行验证，

功能 allownumbers(e)
   {
     var 键= 窗口 .event? e.keyCode:e.which;
     var  keychar = 字符串 .fromCharCode(key);
     var  reg = 新  RegExp (" )
    如果(键==  8 )
    {
     keychar = 字符串 .fromCharCode(key);
    }
    如果(键==  13 )
    {
     key =  8 ;
     keychar = 字符串 .fromCharCode(key);
    }
    返回 reg.test(keychar);
   }

调用在文本框的ONKEYPRESS事件中的此方法
txtBox.Attributes.Add(" ，"  javascript:return allownumbers(event);"); 

更多选项:

http://forums.asp.net/t/1156966.aspx/1 [ ^ ]

< asp:RegularExpressionValidator id = " 
                   ControlToValidate = " 
                   ValidationExpression = " 
                   Display = " 
                   EnableClientScript = " 
                   ErrorMessage = " 
                   runat = " /> 

hi,

Can anyone know?

how to validate the textbox that should accept only Numeric values?

解决方案

Hi, call JS function on textbox. use below code for this:

<asp:textbox id="txtBox" runat="server" width="150px" onkeypress="javascript:return isNumericWithDecimal(event);" xmlns:asp="#unknown"> </asp:textbox>

JS Function

function isNumericWithDecimal(e) 
{
    if ((e.which < 48 || e.which > 57)) 
    {
        if (e.which == 8 || e.which == 46 || e.which == 0) 
        {
            return true;
        }
        else 
        {
            return false;
        }
    }
}

Validate using javascript like,

function allownumbers(e)
   {
    var key = window.event ? e.keyCode : e.which;
    var keychar = String.fromCharCode(key);
    var reg = new RegExp("[0-9.]")
    if (key == 8)
    {
     keychar = String.fromCharCode(key);
    }
    if (key == 13)
    {
     key=8;
     keychar = String.fromCharCode(key);     
    }
    return reg.test(keychar);
   } 

Call this method in ONKEYPRESS event of the textbox like,
txtBox.Attributes.Add("onkeypress","javascript:return allownumbers(event);");

More options:

http://forums.asp.net/t/1156966.aspx/1[^]

<asp:RegularExpressionValidator id="RegularExpressionValidator1"
                   ControlToValidate="TextBox1"
                   ValidationExpression="\d+"
                   Display="Static"
                   EnableClientScript="true"
                   ErrorMessage="Please enter numbers only"
                   runat="server"/>

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