Prototype blank() Method


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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.


prototype_string_processing.htm

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