Tutorials Point


  Learn Prototype
  Prototype Resources
  Selected Reading

Copyright © 2014 by tutorialspoint



  Home     References     Discussion Forums     About TP  

Prototype blank() Method


previous next AddThis Social Bookmark Button


Advertisements

This method checks if the string is 'blank', meaning either empty or containing only whitespace.

Syntax:

string.blank();

Return Value:

  • Returns a boolean value. Either true if string is empty or false if string is not empty

Example:

<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript" 
   src="/javascript/prototype.js">
</script>
<script>

function showResult(){

  var str = '';

  alert("''.blank() : " + str.blank() );
  
  str = '  ';
  alert("'  '.blank() : " + str.blank() );

  str = 'a';
  alert("a.blank() : " + str.blank() );
}

</script>
</head>

<body>

  <p>Click the button to see the result.</p>
  <br />
  <br />
  <input type="button" value="Result" onclick="showResult();"/>

</body>
</html>

To understand it in better way you can Try it yourself.



previous next Printer Friendly

Advertisements


  

Advertisements