输入数字的验证控制 [英] Validation control for entering numbers

问题描述

你好朋友，

我的注册表上有一个文本框.用户必须在其中输入数字，但不能输入字母.

长度必须只能是4位，例如2005.

如果用户输入字母，则应显示一条消息请仅输入数字"

请帮助我，应该使用哪种验证方式.

谢谢.

Hello Frnds,

I have a Textbox on my Registration Form. The user Must enter only numbers into it BUT not alphabets.

the numbers lenght must be only 4 digits like 2005.

If the user enters alphabets, a message should be displayed "Please enter numbers only"

Please help me, which validation should be used, to do this.

Thanks.

推荐答案

您可以通过两种方式使用它:-

1. Javascript
只需将此脚本添加到页面的HTML端

You Can use it by two ways:-

1. Javascript
just add this script on page''s HTML side

<script type="text/javascript">
function checking()
{
  var check1 = document.getElementById("<%=yourtextboxid.ClientID %>").length;
  if(var<>4)
  {
        alert('Please Enter Only 4 digit no.');
        return false;
  }
   else
    {
   return true;
    }
}

//this function is stopping the albhabet values has to be entered
function CheckNemericValue()
        {      
        if((event.keyCode >= 48 && event.keyCode <= 57) )
        {
        event.keyCode = event.keyCode; 
        }
        else
        {
        alert("Only Numbers are allowed");
        event.keyCode = 0;
        return false
        }
        }
</script>

和页面加载事件

and on page load event

protected void Page_Load(object sender, EventArgs e)
{
//this will invoke your javascript function on keypress event of textbox
yourtextboxid.Attributes.Add("onkeypress", "return CheckNemericValue(event);");
}

然后在Button上添加这样的javascript函数.

and on Button just add this javascript function like this.

<asp:button id="Button1" runat="server" text="Add" onclientclick="return checking()" onclick="Button1_Click" xmlns:asp="#unknown" />

这对您有帮助.

和
2.通过验证控件

使用

this will help you.

and the
2. By validation controls

use

<asp:regularexpressionvalidator id="RegularExpressionValidator1" runat="server" errormessage="Please Enter numeric Value Which contains 4 Digits Only" controltovalidate="yourtextboxid" setfocusonerror="True" validationexpression="^([0-9]{4})

" 验证组 =" xmlns:asp =" >

您还可以将文本框的最大长度设置为4.因此用户输入的数字不能超过4位.//这是可选的

告诉我是否有任何错误.

如果有帮助，请将其标记为答案".

You can also set text box''s maximum length=4. so the user can''t input more than 4 digit.//this is optional

tell me if for any error.

Mark it as Answer if it help you.

将范围验证器附加到该文本框，并将最大长度指定为4.

Attach a range validator to that textbox and specify the maximum length as 4.

这篇关于输入数字的验证控制的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！