javascript Implementation Code for Filtering Spaces with Regular Expressions

2021-06-28 10:47:30
OfStack


<html>
<head>
<script type="text/javascript"> 
  //  Remove spaces at left and right ends  
  function trim(str){  
     $a=str.replace(/(^\s*)|(\s*$)/g, ""); 
    alert($a.length);
  //   alert(str.length);
  } 
 
  //  Delete left space  
  function ltrim(str){  
     return str.replace(/(^\s*)/g,""); 
  } 
 
  //  Delete the right space  
  function rtrim(str){  
     return str.replace(/(\s*$)/g,""); 
  } 
</script> 
</head>
<body>
<form>
   Remove spaces at left and right ends : <input type="text" value="" onblur= "trim(this.value)"><br/>
   Delete left space :   <input type="text" value="" onblur= "ltrim(this.value)"><br/>
   Delete the right space    <input type="text" value="" onblur= "rtrim(this.value)">
</form>
</body>
</form>