/**
* slider - jQuery EasyUI
*
* Copyright (c) 2009-2013 www.jeasyui.com. All rights reserved.
*
* Licensed under the GPL or commercial licenses
* To use it on other terms please contact us: jeasyui@gmail.com
* http://www.gnu.org/licenses/gpl.txt
* http://www.jeasyui.com/license_commercial.php
*
* Dependencies:
* draggable
*
*/
(function($){
function init(target){
var slider = $('<div class="slider">' +
'<div class="slider-inner">' +
'<a href="javascript:void(0)" class="slider-handle"></a>' +
'<span class="slider-tip"></span>' +
'</div>' +
'<div class="slider-rule"></div>' +
'<div class="slider-rulelabel"></div>' +
'<div style="clear:both"></div>' +
'<input type="hidden" class="slider-value">' +
'</div>').insertAfter(target);
var name = $(target).hide().attr('name');
if (name){
slider.find('input.slider-value').attr('name', name);
$(target).removeAttr('name').attr('sliderName', name);
}
return slider;
}
/**
* set the slider size, for vertical slider, the height property is required
*/
function setSize(target, param){
var opts = $.data(target, 'slider').options;
var slider = $.data(target, 'slider').slider;
if (param){
if (param.width) opts.width = param.width;
if (param.height) opts.height = param.height;
}
if (opts.mode == 'h'){
slider.css('height', '');
slider.children('div').css('height', '');
if (!isNaN(opts.width)){
slider.width(opts.width);
}
} else {
slider.css('width', '');
slider.children('div').css('width', '');
if (!isNaN(opts.height)){
slider.height(opts.height);
slider.find('div.slider-rule').height(opts.height);
slider.find('div.slider-rulelabel').height(opts.height);
slider.find('div.slider-inner')._outerHeight(opts.height);
}
}
initValue(target);
}
/**
* show slider rule if needed
*/
function showRule(target){
var opts = $.data(target, 'slider').options;
var slider = $.data(target, 'slider').slider;
var aa = opts.mode == 'h' ? opts.rule : opts.rule.slice(0).reverse();
if (opts.reversed){
aa = aa.slice(0).reverse();
}
_build(aa);
function _build(aa){
var rule = slider.find('div.slider-rule');
var label = slider.find('div.slider-rulelabel');
rule.empty();
label.empty();
for(var i=0; i<aa.length; i++){
var distance = i*100/(aa.length-1)+'%';
var span = $('<span></span>').appendTo(rule);
span.css((opts.mode=='h'?'left':'top'), distance);
// show the labels
if (aa[i] != '|'){
span = $('<span></span>').appendTo(label);
span.html(aa[i]);
if (opts.mode == 'h'){
span.css({
left: distance,
marginLeft: -Math.round(span.outerWidth()/2)
});
} else {
span.css({
top: distance,
marginTop: -Math.round(span.outerHeight()/2)
});
}
}
}
}
}
/**
* build the slider and set some properties
*/
function buildSlider(target){
var opts = $.data(target, 'slider').options;
var slider = $.data(target, 'slider').slider;
slider.removeClass('slider-h slider-v slider-disabled');
slider.addClass(opts.mode == 'h' ? 'slider-h' : 'slider-v');
slider.addClass(opts.disabled ? 'slider-disabled' : '');
slider.find('a.slider-handle').draggable({
axis:opts.mode,
cursor:'pointer',
disabled: opts.disabled,
onDrag:function(e){
var left = e.data.left;
var width = slider.width();
if (opts.mode!='h'){
left = e.data.top;
width = slider.height();
}
if (left < 0 || left > width) {
return false;
} else {
var value = pos2value(target, left);
adjustValue(value);
return false;
}
},
onStartDrag:function(){
opts.onSlideStart.call(target, opts.value);
},
onStopDrag:function(e){
var value = pos2value(target, (opts.mode=='h'?e.data.left:e.data.top));
adjustValue(value);
opts.onSlideEnd.call(target, opts.value);
}
});
function adjustValue(value){
var s = Math.abs(value % opts.step);
if (s < opts.step/2){
value -= s;
} else {
value = value - s + opts.step;
}
setValue(target, value);
}
}
/**
* set a specified value to slider
*/
function setValue(target, value){
var opts = $.data(target, 'slider').options;
var slider = $.data(target, 'slider').slider;
var oldValue = opts.value;
if (value < opts.min) value = opts.min;
if (value > opts.max) value = opts.max;
opts.value = value;
$(target).val(value);
slider.find('input.slider-value').val(value);
var pos = value2pos(target, value);
var tip = slider.find('.slider-tip');
if (opts.showTip){
tip.show();
tip.html(opts.tipFormatter.call(target, opts.value));
} else {
tip.hide();
}
if (opts.mode == 'h'){
var style = 'left:'+pos+'px;';
slider.find('.slider-handle').attr('style', style);
tip.attr('style', style + 'margin-left:' + (-Math.round(tip.outerWidth()/2)) + 'px');
} else {
var style = 'top:' + pos + 'px;';
slider.find('.slider-handle').attr('style', style);
tip.attr('style', style + 'margin-left:' + (-Math.round(tip.outerWidth())) + 'px');
}
if (oldValue != value){
opts.onChange.call(target, value, oldValue);
}
}
function initValue(target){
var opts = $.data(target, 'slider').options;
var fn = opts.onChange;
opts.onChange = function(){};
setValue(target, opts.value);
opts.onChange = fn;
}
/**
* translate value to slider position
*/
function value2pos(target, value){
var opts = $.data(target, 'slider').options;
var slider = $.data(target, 'slider').slider;
if (opts.mode == 'h'){
var pos = (value-opts.min)/(opts.max-opts.min)*slider.width();
if (opts.reversed){
pos = slider.width() - pos;
}
} else {
var pos = slider.height() - (value-opts.min)/(opts.max-opts.min)*slider.height();
if (opts.reversed){
pos = slider.height() - pos;
}
}
return pos.toFixed(0);
}
/**
* translate slider position to value
*/
function pos2value(target, pos){
var opts = $.data(target, 'slider').options;
var slider = $.data(target, 'slider').slider;
if (opts.mode == 'h'){
var value = opts.min + (opts.max-opts.min)*(pos/slider.width());
} else {
var value = opts.min + (opts.max-opts.min)*((slider.height()-pos)/slider.height());
}
return opts.reversed ? opts.max - value.toFixed(0) : value.toFixed(0);
}
$.fn.slider = function(options, param){
if (typeof options == 'string'){
return $.fn.slider.methods[options](this, param);
}
options = options || {};
return this.each(function(){
var state = $.data(this, 'slider');
if (state){
$.extend(state.options, options);
} else {
state = $.data(this, 'slider', {
options: $.extend({}, $.fn.slider.defaults, $.fn.slider.parseOptions(this), options),
slider: init(this)
});
$(this).removeAttr('disabled');
}
buildSlider(this);
showRule(this);
setSize(this);
});
};
$.fn.slider.methods = {
options: function(jq){
return $.data(jq[0], 'slider').options;
},
destroy: function(jq){
return jq.each(function(){
$.data(this, 'slider').slider.remove();
$(this).remove();
});
},
resize: function(jq, param){
return jq.each(function(){
setSize(this, param);
});
},
getValue: function(jq){
return jq.slider('options').value;
},
setValue: function(jq, value){
return jq.each(function(){
setValue(this, value);
});
},
enable: function(jq){
return jq.each(function(){
$.data(this, 'slider').options.disabled = false;
buildSlider(this);
});
},
disable: function(jq){
return jq.each(function(){
$.data(this, 'slider').options.disabled = true;
buildSlider(this);
});
}
};
$.fn.slider.parseOptions = function(target){
var t = $(target);
return $.extend({}, $.parser.parseOptions(target, [
'width','height','mode',{reversed:'boolean',showTip:'boolean',min:'number',max:'number',step:'number'}
]), {
value: (t.val() || undefined),
disabled: (t.attr('disabled') ? true : undefined),
rule: (t.attr('rule') ? eval(t.attr('rule')) : undefined)
});
};
$.fn.slider.defaults = {
width: 'auto',
height: 'auto',
mode: 'h', // 'h'(horizontal) or 'v'(vertical)
reversed: false,
showTip: false,
disabled: false,
value: 0,
min: 0,
max: 100,
step: 1,
rule: [], // [0,'|',100]
tipFormatter: function(value){return value},
onChange: function(value, oldValue){},
onSlideStart: function(value){},
onSlideEnd: function(value){}
};
})(jQuery);
