jQuery仅在按键时允许字符之间留有空格

Question

Hi how to allow empty characters between words only. I have tried but doesn't allow empty character anywhere.

Jquery

  $('#txtName').keypress(function (e) { var regex = new RegExp("^[a-zA-Z0-9_ ]*$"); var str = String.fromCharCode(!e.charCode ? e.which : e.charCode); if (regex.test(str)) { return true; } else { e.preventDefault(); alert('Please Enter Alphabet'); return false; } }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="text" id="txtName"> 

It's for name validation. Thanks.

Answer 1

Use this pattern:

/(\s{2,})|[^a-zA-Z']/g

 $('#txtName').keypress(function(e) { var $this = $(this); $(this).val($this.val().replace(/(\\s{2,})|[^a-zA-Z0-9_']/g, ' ').replace(/^\\s*/, '')); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="text" id="txtName" /> 

From JSFiddle

Answer 2

use Trim() method, with this method you can remove any space in first and last of your string, then put equal to null or white-space Online demo

if you want just Regex with /^[\\s\\\xA0]+|[\\s\\\xA0]+$/g you can get any white-space in first and last of your string then out not equal to null or white-space Demo

for more information see this