Prototype - empty() Method

This method checks if the string is empty. This method is different from blank(). See example carefully.

Syntax

string.empty();

Return Value

Returns a boolean value. If string is empty, then it returns true otherwise false.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var str = '';
            alert("''.empty() : " + str.empty() );
            alert("''.blank() : " + str.blank() );
            
            var str = ' ';
            alert("' '.empty() : " + str.empty() );
            alert("' '.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>

Output

prototype_string_processing.htm