如何限制用户不要在文本框中输入其他数字 [英] how to restrict user not to enter other numbers in textbox

问题描述

如何限制用户不要在文本框中输入除12以外的其他数字。

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i我的网页上有一个文本框，用户只能输入此文本框中的数字12。



如果他输入其他数字，则必须显示错误。



请给我一个很好的解决方案。顺便说一下我在asp.net c＃上工作。



Hlep me！提前谢谢

how to restrict user not to enter other numbers in textbox except 12.
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i have a textbox on my webpage the user should enter only the number 12 in this textbox.

if he enters other number, it must shows a error .

Please give me good solution. by the way am working on asp.net c#.

Hlep me ! thank you in advance

推荐答案

最简单的方法是处理 keydown [ ^ ]活动，只允许输入12个。



其他一些可能提供一些见解的文章 -

http://help.dottoro.com/ljlkwans.php [ ^ ]

http://blog.pothoven.net/2008/05/keydown-vs-keypress-in-javascript.html [ ^ ]

The easiest would be to handle the keydown[^] event and only allow 12 to be entered.

Some other articles that might provide some insight -
http://help.dottoro.com/ljlkwans.php[^]
http://blog.pothoven.net/2008/05/keydown-vs-keypress-in-javascript.html[^]

您可以限制用户输入除数字或任何标准以外的任何字符ticular字符集。看看这篇文章。它讨论了类似的技术。



一个用于常见验证方案的小型Javascript框架。 [ ^ ]



它会像

You can restrict the user to enter any characters other than numbers or any particular set of characters. Check out this article. it talks about a technique to so the similar thing.

A Tiny Javascript Framework for Common Validation Scenarios.[^]

it would be something like

<asp:TextBox ID="TextBox7" runat="server" onkeypress="return AcceptRegExOnly(event, /^(1|2)

/）; MaxLength = 2 > < / asp：TextBox >

/);" MaxLength="2"></asp:TextBox>

使用此框架。这里唯一的问题是11和22也被接受，但可以通过使用正确的正则表达式来规避。

using this framework. the only catch here is that 11 and 22 are also accepted but that can be circumvented by using a proper regex.

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