https://www.foshang.org/statics/js/navscroll/navbarscroll.js

1/*
2 * 移动端模拟导航可点击自动滑动 0.1.4
3 * Date: 2017-01-11
4 * by: foshang
5 * 导航可左右滑动，可点击边缘的一个，自动滚动下一个到可视范围【依赖于iscroll.js】
6 */
7(function ($) {
8    $.fn.navbarscroll = function (options) {
9        //各种属性、参数
10        var _defaults = {
11            className:'cur', //当前选中点击元素的class类名
12            clickScrollTime:300, //点击后滑动时间
13            duibiScreenWidth:0.4, //单位以rem为准，默认为0.4rem
14            scrollerWidth:3, //单位以px为准，默认为3,[仅用于特殊情况：外层宽度因为小数点造成的不精准情况]
15            defaultSelect:0, //初始选中第n个，默认第0个
16            fingerClick:0, //目标第0或1个选项触发,必须每一项长度一致，方可用此项
17            endClickScroll:function(thisObj){}//回调函数
18        }
19        var _opt = $.extend(_defaults, options);
20        this.each(function () {
21            //插件实现代码
22            var _wrapper = $(this);
23            var _win = $(window);
24            var _win_width = _win.width(),_wrapper_width = _wrapper.width(),_wrapper_off_left = _wrapper.offset().left;
25            var _wrapper_off_right=_win_width-_wrapper_off_left-_wrapper_width;
26            var _obj_scroller = _wrapper.children('.scroller');
27            var _obj_ul = _obj_scroller.children('ul');
28            var _obj_li = _obj_ul.children('li');
29            var _scroller_w = 0;
30            _obj_li.css({"margin-left":"0","margin-right":"0"});
31            for (var i = 0; i < _obj_li.length; i++) {
32                _scroller_w += _obj_li[i].offsetWidth;
33            }
34            _obj_scroller.width(_scroller_w+_opt.scrollerWidth);
35            var myScroll = new IScroll('#'+_wrapper.attr('id'), {
36                eventPassthrough: true,
37                scrollX: true,
38                scrollY: false,
39                preventDefault: false
40            });
41            _init(_obj_li.eq(_opt.defaultSelect));
42            _obj_li.click(function(){
43                _init($(this));
44            });
45			//解决PC端谷歌浏览器模拟的手机屏幕出现莫名的卡顿现象，滑动时禁止默认事件（2017-01-11）
46			_wrapper[0].addEventListener('touchmove',function (e){e.preventDefault();},false);
47            function _init(thiObj){
48                var $this_obj=thiObj;
49                var duibi=_opt.duibiScreenWidth*_win_width/10,this_index=$this_obj.index(),this_off_left=$this_obj.offset().left,this_pos_left=$this_obj.position().left,this_width=$this_obj.width(),this_prev_width=$this_obj.prev('li').width(),this_next_width=$this_obj.next('li').width();
50                var this_off_right=_win_width-this_off_left-this_width;
51                if(_scroller_w+2>_wrapper_width){
52                    if(_opt.fingerClick==1){
53                        if(this_index==1){
54                            myScroll.scrollTo(-this_pos_left+this_prev_width,0, _opt.clickScrollTime);
55                        }else if(this_index==0){
56                            myScroll.scrollTo(-this_pos_left,0, _opt.clickScrollTime);
57                        }else if(this_index==_obj_li.length-2){
58                            myScroll.scrollBy(this_off_right-_wrapper_off_right-this_width,0, _opt.clickScrollTime);
59                        }else if(this_index==_obj_li.length-1){
60                            myScroll.scrollBy(this_off_right-_wrapper_off_right,0, _opt.clickScrollTime);
61                        }else{
62                            if(this_off_left-_wrapper_off_left-(this_width*_opt.fingerClick)<duibi){
63                                myScroll.scrollTo(-this_pos_left+this_prev_width+(this_width*_opt.fingerClick),0, _opt.clickScrollTime);
64                            }else if(this_off_right-_wrapper_off_right-(this_width*_opt.fingerClick)<duibi){
65                                myScroll.scrollBy(this_off_right-this_next_width-_wrapper_off_right-(this_width*_opt.fingerClick),0, _opt.clickScrollTime);
66                            }
67                        }
68                    }else{
69                        if(this_index==1){
70                            myScroll.scrollTo(-this_pos_left+this_prev_width,0, _opt.clickScrollTime);
71                        }else if(this_index==_obj_li.length-1){
72                            if(this_off_right-_wrapper_off_right>1||this_off_right-_wrapper_off_right<-1){
73                                myScroll.scrollBy(this_off_right-_wrapper_off_right,0, _opt.clickScrollTime);
74                            }
75                        }else{
76                            if(this_off_left-_wrapper_off_left<duibi){
77                                myScroll.scrollTo(-this_pos_left+this_prev_width,0, _opt.clickScrollTime);
78                            }else if(this_off_right-_wrapper_off_right<duibi){
79                                myScroll.scrollBy(this_off_right-this_next_width-_wrapper_off_right,0, _opt.clickScrollTime);
80                            }
81                        }
82                    }
83                }
84                $this_obj.addClass(_opt.className).siblings('li').removeClass(_opt.className);
85                _opt.endClickScroll.call(this,$this_obj);
86            }
87        });
88    };
89})(jQuery);