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<!doctype html>
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< html lang = "en" >
< head >
< meta charset = "utf-8" >
< title > jQuery UI Widget - Default functionality< / title >
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< link rel = "stylesheet" href = "../../themes/base/all.css" >
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< script src = "../../jquery.js" > < / script >
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< script src = "../../ui/core.js" > < / script >
< script src = "../../ui/position.js" > < / script >
< script src = "../../ui/widget.js" > < / script >
< script src = "../../ui/button.js" > < / script >
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< link rel = "stylesheet" href = "../demos.css" >
< style >
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.custom-colorize {
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font-size: 20px;
position: relative;
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width: 75px;
height: 75px;
}
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.custom-colorize-changer {
font-size: 10px;
position: absolute;
right: 0;
bottom: 0;
}
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< / style >
< script >
$(function() {
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// the widget definition, where "custom" is the namespace,
// "colorize" the widget name
$.widget( "custom.colorize", {
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// default options
options: {
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red: 255,
green: 0,
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blue: 0,
// callbacks
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change: null,
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random: null
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},
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// the constructor
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_create: function() {
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this.element
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// add a class for theming
.addClass( "custom-colorize" )
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// prevent double click to select text
.disableSelection();
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this.changer = $( "< button > ", {
text: "change",
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"class": "custom-colorize-changer"
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})
.appendTo( this.element )
.button();
// bind click events on the changer button to the random method
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this._on( this.changer, {
// _on won't call random when widget is disabled
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click: "random"
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});
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this._refresh();
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},
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// called when created, and later when changing options
_refresh: function() {
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this.element.css( "background-color", "rgb(" +
this.options.red +"," +
this.options.green + "," +
this.options.blue + ")"
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);
// trigger a callback/event
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this._trigger( "change" );
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},
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// a public method to change the color to a random value
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// can be called directly via .colorize( "random" )
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random: function( event ) {
var colors = {
red: Math.floor( Math.random() * 256 ),
green: Math.floor( Math.random() * 256 ),
blue: Math.floor( Math.random() * 256 )
};
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// trigger an event, check if it's canceled
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if ( this._trigger( "random", event, colors ) !== false ) {
this.option( colors );
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}
},
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// events bound via _on are removed automatically
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// revert other modifications here
_destroy: function() {
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// remove generated elements
this.changer.remove();
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this.element
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.removeClass( "custom-colorize" )
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.enableSelection()
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.css( "background-color", "transparent" );
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},
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// _setOptions is called with a hash of all options that are changing
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// always refresh when changing options
_setOptions: function() {
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// _super and _superApply handle keeping the right this-context
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this._superApply( arguments );
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this._refresh();
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},
// _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;
}
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this._super( key, value );
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}
});
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// initialize with default options
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$( "#my-widget1" ).colorize();
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// initialize with two customized options
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$( "#my-widget2" ).colorize({
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red: 60,
blue: 60
});
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// initialize with custom green value
// and a random callback to allow only colors with enough green
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$( "#my-widget3" ).colorize( {
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green: 128,
random: function( event, ui ) {
return ui.green > 128;
}
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});
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// click to toggle enabled/disabled
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$( "#disable" ).click(function() {
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// use the custom selector created for each widget to find all instances
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// 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 {
$( ":custom-colorize" ).colorize( "disable" );
}
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});
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// click to set options after initialization
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$( "#black" ).click( function() {
$( ":custom-colorize" ).colorize( "option", {
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red: 0,
green: 0,
blue: 0
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});
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});
});
< / script >
< / head >
< body >
< div >
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< div id = "my-widget1" > color me< / div >
< div id = "my-widget2" > color me< / div >
< div id = "my-widget3" > color me< / div >
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< button id = "disable" > Toggle disabled option< / button >
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< button id = "black" > Go black< / button >
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< / div >
< div class = "demo-description" >
< p > This demo shows a simple custom widget built using the widget factory (jquery.ui.widget.js).< / p >
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< p > The three boxes are initialized in different ways. Clicking them changes their background color. View source to see how it works, its heavily commented< / p >
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< / div >
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< / body >
< / html >
