遮罩的文字框 [英] Masked textbox

问题描述

如何制作仅包含双精度数字的文本框?

How can i make a textbox which takes only double numbers??

推荐答案

通常，方法是不同的:您验证用户输入，仅接受表示双精度值的值数字.
输入无效时，会向用户提示消息错误.
:)

Usually the approach is different: you validate the user input, accepting only values representing double numbers.
On invalid input a message error is prompted to the user.
:)

我认为您需要在触发文本框的keypress事件时验证数字.

只需使用Javascript即可:

I think you need to validate the number when keypress event is triggered for the textbox.

Just use Javascript to do that :

function check_double(e,fieldid)
{
     var field = document.getElementById(fieldid);
     if (!(((e.keyCode>=48)&&(e.keyCode<=57))||(e.keyCode==46)))
     {
        e.returnValue = false;        
        e.keyCode=0;                   
     }     
     if (e.keyCode==46)
     {
        var patt1=new RegExp("\\.");        
        var ch =patt1.exec(field);       
        if(ch==".")
        {
            e.returnValue = false;
            e.keyCode=0;
        }                        
     }
} 

现在，在您的Page_Load中使用以下代码:

Now in your Page_Load use this :

TextBox.Attributes.Add("onkeypress", "javascript:check_double(event,''" + TextBox.ClientID + "'');");

只需将其放置在要验证Double的每个文本框中即可.

希望您喜欢该解决方案.
干杯
:rose:

Just place this for every textbox for which you want to validate Double.

I hope you will like the solution.
Cheers
:rose:

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