Prototype - getDimensions() Method

This method finds the computed width and height of element and returns them as key/value pairs of an object.

This method returns the correct values on elements whose display is set to none either in an inline style rule or in an CSS stylesheet.

Note that the value returned is a number, only although it is expressed in pixels.

Syntax

element.getDimensions();

Return Value

It returns key/value pairs of an object {height: Number, width: Number}.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var dimensions = $('rectangle').getDimensions();
            alert("Element width is " +  dimensions.width );
            alert("Element height is " +  dimensions.height );
         }
      </script>
   </head>

   <body>
      <p>Click the button to see the result.</p>
      
      <div id = "rectangle" 
         style = "font-size: 10px; width: 20em; height: 10em">
         <p>This is the paragraph.</p>
      </div>
      <br />
      
      <input type = "button" value = "showResult" onclick = "showResult();"/>
   </body>
</html>

Output

prototype_element_object.htm