如何仅在javascript中输入字符时获取数字 [英] how to get numbers only while entering characters in javascript

问题描述

尊敬的先生，


我只需要数字，

示例:我的输入是(044)(2000023)，并将其存储在数据库中.
只会得到0442000023.

如何编写代码


请告诉我

by mohan

Dear sir,


I need only number,

example: my input is (044)(2000023) and stored it in database.
and get only 0442000023.

How to write code


please tell me

by mohan

推荐答案

，您可以使用正则表达式定义控件，以允许用户仅输入数字并获取数字.[0 -9] ...

you can use regex for defining the control to allow the user to enter only the number and get number.. [0-9]...

您可以使用jQuery验证.......

You can use jQuery validation .......

我想您是在问:如何仅从字符串中获取数字字符，而忽略其他所有内容.您可以使用正则表达式，然后将所有匹配项组合在一起，但是当您可以轻松地逐个字符地处理它时，这似乎有点过头了:

I think you''re asking: how to get only the numeric characters out of a string, ignoring everything else. You could use a regex and then stick all the matches together, but that seems like overkill when you can process it character by character easily enough:

string NumbersOnly(string input){
 StringBuilder output = new StringBuilder();
 foreach(char c in input)
  if(c >= ''0'' && c <= ''9'') output.Append(c);
 return output.ToString();
}

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