- Prototype Tutorial
- Prototype - Home
- Prototype - Short Overview
- Prototype - Useful Features
- Prototype - Utility Methods
- Prototype - Element Object
- Prototype - Number Processing
- Prototype - Strings Processing
- Prototype - Array Processing
- Prototype - Hash processing
- Prototype - Basic Object
- Prototype - Templating
- Prototype - Enumerating
- Prototype - Event Handling
- Prototype - Form Management
- Prototype - JSON Support
- Prototype - AJAX Support
- Prototype - Expressing Ranges
- Prototype - Periodical Execution
- Prototype Useful Resources
- Prototype - Quick Guide
- Prototype - Useful Resources
- Prototype - Discussion
Prototype - setOpacity() Method
This method sets the visual opacity of an element while working around inconsistencies in various browsers.
The opacity argument should be a floating point number, where the value of 0 is fully transparent and 1 is fully opaque.
Element.setStyle method uses setOpacity internally to set opacity.
Syntax
element.setOpacity(opacity);
Return Value
Returns an HTML element.
Example
<html>
<head>
<title>Prototype examples</title>
<script type = "text/javascript" src = "/javascript/prototype.js"></script>
<script>
function reduceOpacity() {
$('test').setOpacity( 0.5 );
// This is equivalent to
// Element.setStyle({ opacity: 0.5 });
}
</script>
</head>
<body">
<p id = "test">Click the button to see the result.</p>
<input type = "button" value = "Click" onclick = "reduceOpacity();"/>
</body>
</html>
Output
prototype_element_object.htm
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