jquery-mobile/js/jquery.mobile.forms.slider.js

/*
* jQuery Mobile Framework : "slider" plugin
* Copyright (c) jQuery Project
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://jquery.org/license
*/
(function($, undefined ) {
$.widget( "mobile.slider", $.mobile.widget, {
	options: {
		theme: null,
		trackTheme: null,
		disabled: false
	},
	_create: function(){
		var self = this,

			control = this.element,

			parentTheme = control.parents('[class*=ui-bar-],[class*=ui-body-]').eq(0),

			parentTheme = parentTheme.length ? parentTheme.attr('class').match(/ui-(bar|body)-([a-z])/)[2] : 'c',

			theme = this.options.theme ? this.options.theme : parentTheme,

			trackTheme = this.options.trackTheme ? this.options.trackTheme : parentTheme,

			cType = control[0].nodeName.toLowerCase(),
			selectClass = (cType == 'select') ? 'ui-slider-switch' : '',
			controlID = control.attr('id'),
			labelID = controlID + '-label',
			label = $('[for='+ controlID +']').attr('id',labelID),
			val = function(){
				return (cType == 'input') ? parseFloat(control.val()) : control[0].selectedIndex;
			},
			min = (cType == 'input') ? parseFloat(control.attr('min')) : 0,
			max = (cType == 'input') ? parseFloat(control.attr('max')) : control.find('option').length-1,
			step = window.parseFloat(control.attr('step') || 1),
			slider = $('<div class="ui-slider '+ selectClass +' ui-btn-down-'+ trackTheme+' ui-btn-corner-all" role="application"></div>'),
			handle = $('<a href="#" class="ui-slider-handle"></a>')
				.appendTo(slider)
				.buttonMarkup({corners: true, theme: theme, shadow: true})
				.attr({
					'role': 'slider',
					'aria-valuemin': min,
					'aria-valuemax': max,
					'aria-valuenow': val(),
					'aria-valuetext': val(),
					'title': val(),
					'aria-labelledby': labelID
				});

		$.extend(this, {
			slider: slider,
			handle: handle,
			dragging: false,
			beforeStart: null
		});

		if(cType == 'select'){
			slider.wrapInner('<div class="ui-slider-inneroffset"></div>');
			var options = control.find('option');

			control.find('option').each(function(i){
				var side = (i==0) ?'b':'a',
					corners = (i==0) ? 'right' :'left',
					theme = (i==0) ? ' ui-btn-down-' + trackTheme :' ui-btn-active';
				$('<div class="ui-slider-labelbg ui-slider-labelbg-'+ side + theme +' ui-btn-corner-'+ corners+'"></div>').prependTo(slider);
				$('<span class="ui-slider-label ui-slider-label-'+ side + theme +' ui-btn-corner-'+ corners+'" role="img">'+$(this).text()+'</span>').prependTo(handle);
			});

		}

		label.addClass('ui-slider');

		// monitor the input for updated values
		control
			.addClass((cType == 'input') ? 'ui-slider-input' : 'ui-slider-switch')
			.change(function(){
				self.refresh( val(), true );
			})
			.keyup(function(){ // necessary?
				self.refresh( val(), true, true );
			})
			.blur(function(){
				self.refresh( val(), true );
			});

		// prevent screen drag when slider activated
		$(document).bind( "vmousemove", function(event){
			if ( self.dragging ) {
				self.refresh( event );
				return false;
			}
		});

		slider
			.bind( "vmousedown", function(event){
				self.dragging = true;
				if ( cType === "select" ) {
					self.beforeStart = control[0].selectedIndex;
				}
				self.refresh( event );
				return false;
			});

		slider
			.add(document)
			.bind( "vmouseup", function(){
				if ( self.dragging ) {
					self.dragging = false;
					if ( cType === "select" ) {
						if ( self.beforeStart === control[0].selectedIndex ) {
							//tap occurred, but value didn't change. flip it!
							self.refresh( self.beforeStart === 0 ? 1 : 0 );
						}
						var curval = val();
						var snapped = Math.round( curval / (max - min) * 100 );
						handle
							.addClass("ui-slider-handle-snapping")
							.css("left", snapped + "%")
							.animationComplete(function(){
								handle.removeClass("ui-slider-handle-snapping");
							});
					}
					return false;
				}
			});

		slider.insertAfter(control);

		// NOTE force focus on handle
		this.handle
			.bind( "vmousedown", function(){
				$(this).focus();
			})
			.bind( "vclick", false );

		this.handle
			.bind( "keydown", function( event ) {
				var index = val();

				if ( self.options.disabled ) {
					return;
				}

				// In all cases prevent the default and mark the handle as active
				switch ( event.keyCode ) {
				 case $.mobile.keyCode.HOME:
				 case $.mobile.keyCode.END:
				 case $.mobile.keyCode.PAGE_UP:
				 case $.mobile.keyCode.PAGE_DOWN:
				 case $.mobile.keyCode.UP:
				 case $.mobile.keyCode.RIGHT:
				 case $.mobile.keyCode.DOWN:
				 case $.mobile.keyCode.LEFT:
					event.preventDefault();

					if ( !self._keySliding ) {
						self._keySliding = true;
						$( this ).addClass( "ui-state-active" );
					}
					break;
				}

				// move the slider according to the keypress
				switch ( event.keyCode ) {
				 case $.mobile.keyCode.HOME:
					self.refresh(min);
					break;
				 case $.mobile.keyCode.END:
					self.refresh(max);
					break;
				 case $.mobile.keyCode.PAGE_UP:
				 case $.mobile.keyCode.UP:
				 case $.mobile.keyCode.RIGHT:
					self.refresh(index + step);
					break;
				 case $.mobile.keyCode.PAGE_DOWN:
				 case $.mobile.keyCode.DOWN:
				 case $.mobile.keyCode.LEFT:
					self.refresh(index - step);
					break;
				}
			}) // remove active mark
			.keyup(function( event ) {
				if ( self._keySliding ) {
					self._keySliding = false;
					$( this ).removeClass( "ui-state-active" );
				}
			});

		this.refresh();
	},

	refresh: function(val, isfromControl, preventInputUpdate){
		if ( this.options.disabled ) { return; }

		var control = this.element, percent,
			cType = control[0].nodeName.toLowerCase(),
			min = (cType === "input") ? parseFloat(control.attr("min")) : 0,
			max = (cType === "input") ? parseFloat(control.attr("max")) : control.find("option").length - 1;

		if ( typeof val === "object" ) {
			var data = val,
				// a slight tolerance helped get to the ends of the slider
				tol = 8;
			if ( !this.dragging
					|| data.pageX < this.slider.offset().left - tol
					|| data.pageX > this.slider.offset().left + this.slider.width() + tol ) {
				return;
			}
			percent = Math.round( ((data.pageX - this.slider.offset().left) / this.slider.width() ) * 100 );
		} else {
			if ( val == null ) {
				val = (cType === "input") ? parseFloat(control.val()) : control[0].selectedIndex;
			}
			percent = (parseFloat(val) - min) / (max - min) * 100;
		}

		if ( isNaN(percent) ) { return; }
		if ( percent < 0 ) { percent = 0; }
		if ( percent > 100 ) { percent = 100; }

		var newval = Math.round( (percent / 100) * (max - min) ) + min;
		if ( newval < min ) { newval = min; }
		if ( newval > max ) { newval = max; }

		//flip the stack of the bg colors
		if ( percent > 60 && cType === "select" ) {

		}
		this.handle.css("left", percent + "%");
		this.handle.attr({
				"aria-valuenow": (cType === "input") ? newval : control.find("option").eq(newval).attr("value"),
				"aria-valuetext": (cType === "input") ? newval : control.find("option").eq(newval).text(),
				title: newval
			});

		// add/remove classes for flip toggle switch
		if ( cType === "select" ) {
			if ( newval === 0 ) {
				this.slider.addClass("ui-slider-switch-a")
					.removeClass("ui-slider-switch-b");
			} else {
				this.slider.addClass("ui-slider-switch-b")
					.removeClass("ui-slider-switch-a");
			}
		}

		if(!preventInputUpdate){
			// update control's value
			if ( cType === "input" ) {
				control.val(newval);
			} else {
				control[ 0 ].selectedIndex = newval;
			}
			if (!isfromControl) { control.trigger("change"); }
		}
	},

	enable: function(){
		this.element.attr("disabled", false);
		this.slider.removeClass("ui-disabled").attr("aria-disabled", false);
		return this._setOption("disabled", false);
	},

	disable: function(){
		this.element.attr("disabled", true);
		this.slider.addClass("ui-disabled").attr("aria-disabled", true);
		return this._setOption("disabled", true);
	}

});
})( jQuery );