Widget Factory


Create stateful jQuery plugins using the same abstraction as all jQuery UI widgets.

This demo shows a simple custom widget built using the widget factory (jquery.ui.widget.js).

The three boxes are initialized in different ways. Clicking them changes their background color. View source to see how it works, its heavily commented

view source
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI Widget - Default functionality</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.11.2/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<style>
.custom-colorize {
font-size: 20px;
position: relative;
width: 75px;
height: 75px;
}
.custom-colorize-changer {
font-size: 10px;
position: absolute;
right: 0;
bottom: 0;
}
</style>
<script>
$(function() {
// the widget definition, where "custom" is the namespace,
// "colorize" the widget name
$.widget( "custom.colorize", {
// default options
options: {
red: 255,
green: 0,
blue: 0,
// callbacks
change: null,
random: null
},
// the constructor
_create: function() {
this.element
// add a class for theming
.addClass( "custom-colorize" )
// prevent double click to select text
.disableSelection();
this.changer = $( "<button>", {
text: "change",
"class": "custom-colorize-changer"
})
.appendTo( this.element )
.button();
// bind click events on the changer button to the random method
this._on( this.changer, {
// _on won't call random when widget is disabled
click: "random"
});
this._refresh();
},
// called when created, and later when changing options
_refresh: function() {
this.element.css( "background-color", "rgb(" +
this.options.red +"," +
this.options.green + "," +
this.options.blue + ")"
);
// trigger a callback/event
this._trigger( "change" );
},
// a public method to change the color to a random value
// can be called directly via .colorize( "random" )
random: function( event ) {
var colors = {
red: Math.floor( Math.random() * 256 ),
green: Math.floor( Math.random() * 256 ),
blue: Math.floor( Math.random() * 256 )
};
// trigger an event, check if it's canceled
if ( this._trigger( "random", event, colors ) !== false ) {
this.option( colors );
}
},
// events bound via _on are removed automatically
// revert other modifications here
_destroy: function() {
// remove generated elements
this.changer.remove();
this.element
.removeClass( "custom-colorize" )
.enableSelection()
.css( "background-color", "transparent" );
},
// _setOptions is called with a hash of all options that are changing
// always refresh when changing options
_setOptions: function() {
// _super and _superApply handle keeping the right this-context
this._superApply( arguments );
this._refresh();
},
// _setOption is called for each individual option that is changing
_setOption: function( key, value ) {
// prevent invalid color values
if ( /red|green|blue/.test(key) && (value < 0 || value > 255) ) {
return;
}
this._super( key, value );
}
});
// initialize with default options
$( "#my-widget1" ).colorize();
// initialize with two customized options
$( "#my-widget2" ).colorize({
red: 60,
blue: 60
});
// initialize with custom green value
// and a random callback to allow only colors with enough green
$( "#my-widget3" ).colorize( {
green: 128,
random: function( event, ui ) {
return ui.green > 128;
}
});
// click to toggle enabled/disabled
$( "#disable" ).click(function() {
// use the custom selector created for each widget to find all instances
// all instances are toggled together, so we can check the state from the first
if ( $( ":custom-colorize" ).colorize( "option", "disabled" ) ) {
$( ":custom-colorize" ).colorize( "enable" );
} else {
$( ":custom-colorize" ).colorize( "disable" );
}
});
// click to set options after initialization
$( "#green" ).click( function() {
$( ":custom-colorize" ).colorize( "option", {
red: 64,
green: 250,
blue: 8
});
});
});
</script>
</head>
<body>
<div>
<div id="my-widget1">color me</div>
<div id="my-widget2">color me</div>
<div id="my-widget3">color me</div>
<button id="disable">Toggle disabled option</button>
<button id="green">Go green</button>
</div>
</body>
</html>

Want to learn more about the widget factory? Check out the API documentation.