javascript验证空间 [英] javascriptvalidation for space

问题描述

嗨 我想制作一个JavaScript函数来提示用户在25个字符后放置空格.这意味着用户有必要在总长度为58的文本框中放置25个字符后的空格.

等待中

到现在为止，我一直在使用此

Hi I want to make a javascript function that will prompt user to put space after 25 characters.Means it will be necessary for user to put space after 25 characters in a textbox which has total length of 58.

Waiting

Till now m using this

function nospaces(t){
  if(t.value.match(/\s/g)){
    alert('Sorry, you are not allowed to enter any spaces');
    t.value=t.value.replace(/\s/g,'');
  }
}

<input type="text" maxlength="58" name ="textbox" id="textbox" onkeyup="nospaces(this)">

但是它的作用是不允许有任何空间

ANy Help

but what it does ,it does not allow any space

ANy Help

推荐答案

function isValid(e){
   var value = e.value;

   // check if value is null
   if(value==null) {
     alert('value is null');
     return false;
   }

   // check if value is exact 58 characters long
   if(value.length!=58) {
     alert('value is not 58 characters long');
     return false;
   }

   // check if character 25 is a space
   if(value.substring(25,26)!=' ') {
     alert('character 26 is not a space');
     return false;
   }

   return true;
}

<input type="text" maxlength="58" name ="textbox" id="textbox" onblur="isValid(this)">

尝试以下操作:
按钮的aspx标记

Try this:

the aspx markup for button

<asp:TextBox ID="TextBox1" runat="server" onkeypress="return checkSpace(this);" Width="485px" MaxLength="58"></asp:TextBox>

和JavaScript来实现您想要的

and the javaScript to achieve what you want

function checkSpace(sender)
   {
       var data = sender.value;

       if(data.length == 25 && data.substring(25,26) != ' ')
       {
           alert('please enter space now');
            return false;
       }
   }

我对它进行了最终测试，并且工作正常.让我知道它是否对您也有用.如果没有，我会尝试完善答案.

I tested it on my end and it is working fine. Let me know if it works on your end too. if not I will try to refine my answer.

在正则表达式中查看这些文章
Article1 [ Article2 [ Article3 [第4条 [

look these articles on regular expression
Article1[^]
Article2[^]
Article3[^]
Article4[^]

这篇关于javascript验证空间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！