jquery plug-in development to implement google circle selection function_jquery

;(function ($) {
    /*
     * 基于jQuery实现类似Google+圈子选择功能插件（支持键盘事件）@Mr.Think(http://mrthink.net/)
     */
    $.fn.iChoose = function (options) {
        var SELF=this;
        var iset = $.extend({}, $.fn.iChoose.defaults, options);
        var _h,pull=null;
        var main=$(iset.choMain);
        var chose=$(iset.choCls,main);
        var input=$(SELF);
        var tips=$(iset.tips,main);
        var cls=iset.selCls;
        var ids=$(iset.chsIds);
        var _l=iset.limit;
        //若无列表数据则中断
        if(iset.data.length==0){return false}
        //初始化下拉列表
        var tpl='';
if(pull==null){
main.append(tpl);
}
pull=$('.' iset.pullCls,main);
_h= pull.find('li').outerHeight(true);
pull.width(main.width()-2);
//Action function
var Action={
init:function (){
                                                                                                                                                                                                             . removeClass(cls);
});
Action.choose($(this) );
                                                                                              });
                                                          Select
                                                                                                                                                            },
move: function(dir) {
                                                                                                                                                                                                                                                                        ; ).filter(':visible');
var cur=item.filter('.' cls);
cur.size()==0 ? index=-1 : index=item.index(cur );
item.eq(dir=='up' ? (index<1 ? 0 : index-1) : index 1).addClass(cls).siblings().removeClass(cls);
/Follow scroll when moving
if(item.size()>_l){
//Scroll down
if(dir=='down'){
              pull.scrollTop((index 2-_l)*_h);
                                               
                    //上翻滚动
                    if(dir=='up'){
                        pull.scrollTop((index-1)*_h);
                    }
                }
            },
            choose:function(el){
                //列表选择
                var mid=el.attr('data-mid');
                var name=el.text();
                tips.before('');
                input.focus();
                el.hide().removeClass('hook_visible');
                //返回选中列表id
                ids.val() =='' ? ids.val(mid) : ids.val(ids.val() ',' mid);
                pull.find('li.hook_visible:first').addClass(cls).siblings().removeClass(cls);
                this.upstyle();
            },
            undock:function(el){
                //删除已选
                var mid=el.attr('data-mid');
                var idsArr=ids.val().split(',');
                input.focus();
                el.parent().remove();
                idsArr=$.grep(idsArr,function(v,k){
                   return v != mid;
                });
                ids.val(idsArr.join(','));
                pull.find('li.hook_' mid).show().addClass('hook_visible');
                this.upstyle();
            },
            show:function(){
                //显示列表
                pull.slideDown(100,function(){Action.match('')});
                pull.find('li.hook_visible:first').addClass(cls).siblings().removeClass(cls);
                $(SELF).focus();
                tips.hide();
                input.addClass(iset.inputWCls);
            },
            hide:function(){
                //隐藏列表
                pull.slideUp(100);
                $(SELF).blur();
                tips.show();
                input.removeClass(iset.inputWCls);
            },
            upstyle:function(type){
                //更新下拉列表样式 - 当已选换行时 --
                var len=pull.find('li.hook_visible').size();
                if(type=='match'){
                    len=pull.find('li:visible').size();
                }
if(len<_l){
pull.height(_h*len);
if(len==0){
This.hide();
}
} else{
pull.height(_h*_l);
}
pull.css('top',chose.outerHeight());
} ,
match:function(str) {
                                                                                                                                                                                  var name=$( this).attr('data-name');
name.match(str.toUpperCase())!=null ? $(this).show() : $(this).hide();
});
If(visible.size()==0 && $('.' iset.noResCls).size()==0){
pull.find('li:first').before ('

No selection list yet

')
                                                                                                     🎜> blur:function(str){
//Click to hide the non-selected area
pull.find('li.hook_visible').each(function(){
var name=$ (this). text();
if(name == str){
                                                                  });
input.val('');
                                                                                                                                   . > 'keyup change':function(){
var val= $.trim(input.val());
Action.match(val);
}.          } ,
                                                                                                                                                              .
40 - down;
9 - tab;
13 - enter
*/
'keydown':function(e){
switch (e.keyCode) {
case 8:
                                                                                                                                                                                                                                      through ose.find('.' iset.removeEl ':last');
                                                                                                                                                                                                                                                                                                   }
}
                        break;
                    case 27:
                        e.preventDefault();
                        Action.hide();
                        break;
                    case 38:
                        e.preventDefault();
                        Action.move('up');
                        break;
                    case 40:
                        e.preventDefault();
                        Action.move('down')
                        break;
                    case 9:
                    case 13:
                        e.preventDefault();
                        Action.choose(pull.find('.' cls));
                        break;
                    default:
                        $.noop();
                }
            }
        });
        //点击非当前区域隐藏弹出层
        main.click(function(e){
            e.stopPropagation();
        });
        $(document).click(function(){
           Action.hide();
        });
    }
    $.fn.iChoose.defaults = {
        /*
        data:传入值，可以实时ajax传上，演示中是json值，具体格式可参考mod.udatas.js中的$.map(...)
        limit:每次显示的条数，其他滚动显示
        choMain:载入区域id
        pullCls:弹出列表的class
        choCls:已选择列表的外围class
        selItemCls:已选择的单个元素class
        removeEl:删除元素的class
        selCls:列表高亮的class
        inputWCls:input的class
        tips:默认提示值元素钩子
        noResCls:列表中无结果时的cls
        chsIds:已选择列表的id值，传给后端用的。(This value can also be passed back from the plug-in using the callback function) 'icm-list',
choCls:'.icm-box',
selItemCls:'icm-item',
removeEl:'icm-delete',
selCls:'selected',
inputWCls:'icm-input-w',
tips:'.icm-cur-txt',
noResCls:'hook_noresult',
chsIds:'#iChooseIds'
}
})(jQuery);