gusucode.com > 248 - 黄色单页 html99精品模板 > 248 - 黄色单页/js/jquery.easydropdown.js
/*
* EASYDROPDOWN - A Drop-down Builder for Styleable Inputs and Menus
* Version: 2.1.4
* License: Creative Commons Attribution 3.0 Unported - CC BY 3.0
* http://creativecommons.org/licenses/by/3.0/
* This software may be used freely on commercial and non-commercial projects with attribution to the author/copyright holder.
* Author: Patrick Kunka
* Copyright 2013 Patrick Kunka, All Rights Reserved
*/
(function($){
function EasyDropDown(){
this.isField = true,
this.down = false,
this.inFocus = false,
this.disabled = false,
this.cutOff = false,
this.hasLabel = false,
this.keyboardMode = false,
this.nativeTouch = true,
this.wrapperClass = 'dropdown',
this.onChange = null;
};
EasyDropDown.prototype = {
constructor: EasyDropDown,
instances: {},
init: function(domNode, settings){
var self = this;
$.extend(self, settings);
self.$select = $(domNode);
self.id = domNode.id;
self.options = [];
self.$options = self.$select.find('option');
self.isTouch = 'ontouchend' in document;
self.$select.removeClass(self.wrapperClass+' dropdown');
if(self.$select.is(':disabled')){
self.disabled = true;
};
if(self.$options.length){
self.$options.each(function(i){
var $option = $(this);
if($option.is(':selected')){
self.selected = {
index: i,
title: $option.text()
}
self.focusIndex = i;
};
if($option.hasClass('label') && i == 0){
self.hasLabel = true;
self.label = $option.text();
$option.attr('value','');
} else {
self.options.push({
domNode: $option[0],
title: $option.text(),
value: $option.val(),
selected: $option.is(':selected')
});
};
});
if(!self.selected){
self.selected = {
index: 0,
title: self.$options.eq(0).text()
}
self.focusIndex = 0;
};
self.render();
};
},
render: function(){
var self = this,
touchClass = self.isTouch && self.nativeTouch ? ' touch' : '',
disabledClass = self.disabled ? ' disabled' : '';
self.$container = self.$select.wrap('<div class="'+self.wrapperClass+touchClass+disabledClass+'"><span class="old"/></div>').parent().parent();
self.$active = $('<span class="selected">'+self.selected.title+'</span>').appendTo(self.$container);
self.$carat = $('<span class="carat"/>').appendTo(self.$container);
self.$scrollWrapper = $('<div><ul/></div>').appendTo(self.$container);
self.$dropDown = self.$scrollWrapper.find('ul');
self.$form = self.$container.closest('form');
$.each(self.options, function(){
var option = this,
active = option.selected ? ' class="active"':'';
self.$dropDown.append('<li'+active+'>'+option.title+'</li>');
});
self.$items = self.$dropDown.find('li');
if(self.cutOff && self.$items.length > self.cutOff)self.$container.addClass('scrollable');
self.getMaxHeight();
if(self.isTouch && self.nativeTouch){
self.bindTouchHandlers();
} else {
self.bindHandlers();
};
},
getMaxHeight: function(){
var self = this;
self.maxHeight = 0;
for(i = 0; i < self.$items.length; i++){
var $item = self.$items.eq(i);
self.maxHeight += $item.outerHeight();
if(self.cutOff == i+1){
break;
};
};
},
bindTouchHandlers: function(){
var self = this;
self.$container.on('click.easyDropDown',function(){
self.$select.focus();
});
self.$select.on({
change: function(){
var $selected = $(this).find('option:selected'),
title = $selected.text(),
value = $selected.val();
self.$active.text(title);
if(typeof self.onChange === 'function'){
self.onChange.call(self.$select[0],{
title: title,
value: value
});
};
},
focus: function(){
self.$container.addClass('focus');
},
blur: function(){
self.$container.removeClass('focus');
}
});
},
bindHandlers: function(){
var self = this;
self.query = '';
self.$container.on({
'click.easyDropDown': function(){
if(!self.down && !self.disabled){
self.open();
} else {
self.close();
};
},
'mousemove.easyDropDown': function(){
if(self.keyboardMode){
self.keyboardMode = false;
};
}
});
$('body').on('click.easyDropDown.'+self.id,function(e){
var $target = $(e.target),
classNames = self.wrapperClass.split(' ').join('.');
if(!$target.closest('.'+classNames).length && self.down){
self.close();
};
});
self.$items.on({
'click.easyDropDown': function(){
var index = $(this).index();
self.select(index);
self.$select.focus();
},
'mouseover.easyDropDown': function(){
if(!self.keyboardMode){
var $t = $(this);
$t.addClass('focus').siblings().removeClass('focus');
self.focusIndex = $t.index();
};
},
'mouseout.easyDropDown': function(){
if(!self.keyboardMode){
$(this).removeClass('focus');
};
}
});
self.$select.on({
'focus.easyDropDown': function(){
self.$container.addClass('focus');
self.inFocus = true;
},
'blur.easyDropDown': function(){
self.$container.removeClass('focus');
self.inFocus = false;
},
'keydown.easyDropDown': function(e){
if(self.inFocus){
self.keyboardMode = true;
var key = e.keyCode;
if(key == 38 || key == 40 || key == 32){
e.preventDefault();
if(key == 38){
self.focusIndex--
self.focusIndex = self.focusIndex < 0 ? self.$items.length - 1 : self.focusIndex;
} else if(key == 40){
self.focusIndex++
self.focusIndex = self.focusIndex > self.$items.length - 1 ? 0 : self.focusIndex;
};
if(!self.down){
self.open();
};
self.$items.removeClass('focus').eq(self.focusIndex).addClass('focus');
if(self.cutOff){
self.scrollToView();
};
self.query = '';
};
if(self.down){
if(key == 9 || key == 27){
self.close();
} else if(key == 13){
e.preventDefault();
self.select(self.focusIndex);
self.close();
return false;
} else if(key == 8){
e.preventDefault();
self.query = self.query.slice(0,-1);
self.search();
clearTimeout(self.resetQuery);
return false;
} else if(key != 38 && key != 40){
var letter = String.fromCharCode(key);
self.query += letter;
self.search();
clearTimeout(self.resetQuery);
};
};
};
},
'keyup.easyDropDown': function(){
self.resetQuery = setTimeout(function(){
self.query = '';
},1200);
}
});
self.$dropDown.on('scroll.easyDropDown',function(e){
if(self.$dropDown[0].scrollTop >= self.$dropDown[0].scrollHeight - self.maxHeight){
self.$container.addClass('bottom');
} else {
self.$container.removeClass('bottom');
};
});
if(self.$form.length){
self.$form.on('reset.easyDropDown', function(){
var active = self.hasLabel ? self.label : self.options[0].title;
self.$active.text(active);
});
};
},
unbindHandlers: function(){
var self = this;
self.$container
.add(self.$select)
.add(self.$items)
.add(self.$form)
.add(self.$dropDown)
.off('.easyDropDown');
$('body').off('.'+self.id);
},
open: function(){
var self = this,
scrollTop = window.scrollY || document.documentElement.scrollTop,
scrollLeft = window.scrollX || document.documentElement.scrollLeft,
scrollOffset = self.notInViewport(scrollTop);
self.closeAll();
self.getMaxHeight();
self.$select.focus();
window.scrollTo(scrollLeft, scrollTop+scrollOffset);
self.$container.addClass('open');
self.$scrollWrapper.css('height',self.maxHeight+'px');
self.down = true;
},
close: function(){
var self = this;
self.$container.removeClass('open');
self.$scrollWrapper.css('height','0px');
self.focusIndex = self.selected.index;
self.query = '';
self.down = false;
},
closeAll: function(){
var self = this,
instances = Object.getPrototypeOf(self).instances;
for(var key in instances){
var instance = instances[key];
instance.close();
};
},
select: function(index){
var self = this;
if(typeof index === 'string'){
index = self.$select.find('option[value='+index+']').index() - 1;
};
var option = self.options[index],
selectIndex = self.hasLabel ? index + 1 : index;
self.$items.removeClass('active').eq(index).addClass('active');
self.$active.text(option.title);
self.$select
.find('option')
.removeAttr('selected')
.eq(selectIndex)
.prop('selected',true)
.parent()
.trigger('change');
self.selected = {
index: index,
title: option.title
};
self.focusIndex = i;
if(typeof self.onChange === 'function'){
self.onChange.call(self.$select[0],{
title: option.title,
value: option.value
});
};
},
search: function(){
var self = this,
lock = function(i){
self.focusIndex = i;
self.$items.removeClass('focus').eq(self.focusIndex).addClass('focus');
self.scrollToView();
},
getTitle = function(i){
return self.options[i].title.toUpperCase();
};
for(i = 0; i < self.options.length; i++){
var title = getTitle(i);
if(title.indexOf(self.query) == 0){
lock(i);
return;
};
};
for(i = 0; i < self.options.length; i++){
var title = getTitle(i);
if(title.indexOf(self.query) > -1){
lock(i);
break;
};
};
},
scrollToView: function(){
var self = this;
if(self.focusIndex >= self.cutOff){
var $focusItem = self.$items.eq(self.focusIndex),
scroll = ($focusItem.outerHeight() * (self.focusIndex + 1)) - self.maxHeight;
self.$dropDown.scrollTop(scroll);
};
},
notInViewport: function(scrollTop){
var self = this,
range = {
min: scrollTop,
max: scrollTop + (window.innerHeight || document.documentElement.clientHeight)
},
menuBottom = self.$dropDown.offset().top + self.maxHeight;
if(menuBottom >= range.min && menuBottom <= range.max){
return 0;
} else {
return (menuBottom - range.max) + 5;
};
},
destroy: function(){
var self = this;
self.unbindHandlers();
self.$select.unwrap().siblings().remove();
self.$select.unwrap();
delete Object.getPrototypeOf(self).instances[self.$select[0].id];
},
disable: function(){
var self = this;
self.disabled = true;
self.$container.addClass('disabled');
self.$select.attr('disabled',true);
if(!self.down)self.close();
},
enable: function(){
var self = this;
self.disabled = false;
self.$container.removeClass('disabled');
self.$select.attr('disabled',false);
}
};
var instantiate = function(domNode, settings){
domNode.id = !domNode.id ? 'EasyDropDown'+rand() : domNode.id;
var instance = new EasyDropDown();
if(!instance.instances[domNode.id]){
instance.instances[domNode.id] = instance;
instance.init(domNode, settings);
};
},
rand = function(){
return ('00000'+(Math.random()*16777216<<0).toString(16)).substr(-6).toUpperCase();
};
$.fn.easyDropDown = function(){
var args = arguments,
dataReturn = [],
eachReturn;
eachReturn = this.each(function(){
if(args && typeof args[0] === 'string'){
var data = EasyDropDown.prototype.instances[this.id][args[0]](args[1], args[2]);
if(data)dataReturn.push(data);
} else {
instantiate(this, args[0]);
};
});
if(dataReturn.length){
return dataReturn.length > 1 ? dataReturn : dataReturn[0];
} else {
return eachReturn;
};
};
$(function(){
if(typeof Object.getPrototypeOf !== 'function'){
if(typeof 'test'.__proto__ === 'object'){
Object.getPrototypeOf = function(object){
return object.__proto__;
};
} else {
Object.getPrototypeOf = function(object){
return object.constructor.prototype;
};
};
};
$('select.dropdown').each(function(){
var json = $(this).attr('data-settings');
settings = json ? $.parseJSON(json) : {};
instantiate(this, settings);
});
});
})(jQuery);