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  • jquery——左右按钮点击切换一组图片功能

    一、最终效果

    二、功能分析

    1、需求分析

    点击左边pre按钮,显示前面三个图片,点击右边的next按钮,显示后面的一组(三个)图片。初始化只显示next按钮,到最后一组只显示pre按钮,中间过程两按钮都显示。

    效果图是最终效果有做响应式,但这不是重点,不做介绍。

    2、html结构分析

     <div class="activity" id="activity-slide">
            <a href="javascript:void(0)" class="pg_left ps_pre"></a>
            <a href="javascript:void(0)" class="pg_right ps_next" ></a>
              <ul class="clearfix">
                <li><a href="javascript:;"><img src="images/activity01-1410.jpg"></a></li>
                <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
                <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
                <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
                <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
          </ul>
    </div>

     #activity-slide是整个幻灯的入口,后面会将其作为参数来调用幻灯功能。

     两个按钮ps_pre和ps_next将添加click事件响应点击切换功能。

     3、功能分析

    因为左右切换都是三个为一组的切换,如果li总个数不是3的倍数时,需要增加li节点填满。

    //需要追加的li节点个数
    var addli = 0;
    //一组切换3个li
    var num=3;
    var lisize = a.find("ul li").size();//获取li个数
    
    //判断需要添加的li节点数量
    var reminder=lisize%num;
    if(lisize%num!=0){addli = num-reminder;}
    else{addli = 0;}
    addlist();

    上面是判断得到需要追加的个数lisize,然后调用addlist追加。

    addlist如下,从ul的第一个li开始复制,需要几个就复制出几个节点追加。节点追加完毕后重新计算ul的宽度。

            function addlist(){
                for(i=0;i<addli;i++){
                    var html = a.find("ul li").eq(i).html();
                    a.find("ul").append("<li>"+html+"</li>");    
                }
                a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
            }

    现在准备工作已经完成了。接下来就是给按钮添加响应事件。在幻灯切换时涉及到左右按钮的显示和隐藏,所以先说这个按钮显示功能,将此分装成一个函数btnshow。

            /***
            参数说明:
            now:当前是第几组,默认是0
            c:总共有几组
            d:初始化时li的个数
            e:每组显示li个数
            ***/
            function btnshow(now,c,d,e){
                if(d<=e){//如果初始化时li的个数小于一组要显示的数,则不显示pre和next按钮
                    a.find(".ps_next").hide();
                    a.find(".ps_pre").hide();
                }else if(now==0){//初始化now=0,显示第一组,只显示next
                    a.find(".ps_next").show();
                    a.find(".ps_pre").hide();    
                }else if(now==c-1){//显示到最后一组,只显示pre
                    a.find(".ps_next").hide();
                    a.find(".ps_pre").show();    
                }else{//显示中间组,pre和next都需要显示
                    a.find(".ps_next").show();
                    a.find(".ps_pre").show();
                }
            }

     接下来幻灯切换。这里a是传入的参数,也就是 #activity-slide。给它下面的所有的pre和next添加响应。

    向前一组,组数now减一,now是几,就让ul的margin-left为负几倍的组宽(即3倍的(li宽度+margin宽度)),然后显示对于按钮即可。

    向后滑动一组li同理。

            function photoscroll(){
                a.find(".ps_pre").on("click",function(){//console.log(num);    
                    now--;
                    if(now >= 0){                  
                        a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
                        btnshow(now,parseInt((lisize+addli)/num),lisize,num);
                    }
                });
    
                a.find(".ps_next").on("click",function(){//console.log(num);    
                    now++;
                    if(now < (lisize+addli)/num){    
                        a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
                        btnshow(now,parseInt((lisize+addli)/num),lisize,num);
                    }    
                });    
                btnshow(now,parseInt((lisize+addli)/num),lisize,num);        
            }

    4、问题

    可能是jquery写的原因,加了浏览器缩放尺寸响应后点击切换按钮响应有延时。

    三、代码

    1、用到图片

    2、完整代码

    完整代码

    <!DOCTYPE HTML>
    <html>
    <head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" type="text/css" href="css/style.css">
    
    <script>
    window.onresize=function(){
        var winWidth = document.body.clientWidth;
        if(winWidth <=1180){
            body.className="grid-960"; 
        }else  if (winWidth<= 1410){
            body.className="grid-1180"; 
        }else if (winWidth>1410){
            body.className="grid-1410"; 
        }else {
            alert("do not know!");
        }
    }
    </script>
    </head>
    <body id="body" class="">
    <script>//初始化状态显示样式判断,放在body后面
    var winWidth = document.body.clientWidth;
    if (winWidth <=1180){
        body.className="grid-960"; 
    }else  if (winWidth<= 1410){
        body.className="grid-1180"; 
    }else if (winWidth>1410){
        body.className="grid-1410"; 
    }else {
        alert("do not know!");
    }
    </script>
    <div class="wapper">
        
        <div class="section">
            <h2 class="title">热门活动</h2>
            <div class="activity" class="movie" id="activity-slide">
                <a href="javascript:void(0)" class="pg_left ps_pre"></a>
                <a href="javascript:void(0)" class="pg_right ps_next" ></a>
                <ul class="clearfix">
                    <li><a href="javascript:;"><img src="images/activity01-1410.jpg"></a></li>
                    <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
                    <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
                    <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
                    <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
                </ul>
            </div>
        </div>
    
    </div>
    
    
    </body>
    </html>
    <script src="http://code.jquery.com/jquery-latest.js"></script>
    <script>
    //首页图片滚动切换
    (function($){
        $.photolist=function(a){        
            var w_li = a.find("li").width();
            var h_li = a.find("li").height();
            var margin_li=parseInt(a.find("li").css("marginLeft"));
            var now = 0;
            var num = 0;
            var addli = 0;
            var lisize = a.find("ul li").size();
            var htmlall = a.find("ul").html();
            
            //判断每次滚动数量
            /*
            var w_body = $("body").width();
            if(w_body <=1170){
                var num = 3;
            }else if(w_body<= 1380){
                var num = 4;
            }else if(w_body>1380){
                var num = 5;
            }
            */
            var num=3;
            
            //判断需要添加的li节点数量
            var reminder=lisize%num;
            if(lisize%num!=0){addli = num-reminder;}
            else{addli = 0;}
            addlist();
            //点击滚动事件
            photoscroll();
            
            $(window).resize(function(){
                //location.reload();
                now = 0;
                addli = 0;
                a.find("ul").html(htmlall);//html内容还原初始值
                a.find(".ps_next").show();//按钮样式初始化
                a.find(".ps_pre").hide();
                //判断每次滚动数量
                /*
                var w_body = $("body").width();
                if(w_body <=1170){
                    var num = 3;
                }else if(w_body<= 1380){
                    var num = 4;
                }else if(w_body>1380){
                    var num = 5;
                }
                */
                var num=3;
                //判断需要添加的li节点数量
                var reminder=lisize%num;
                if(lisize%num!=0){addli = num-reminder;}
                else{addli = 0;}
                addlist();
                w_li = a.find("li").width();
                margin_li=parseInt(a.find("li").css("marginLeft"));
                a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
                a.find("ul").animate({"margin-left":0});//ul位置还原
                btnshow(now,parseInt((lisize+addli)/num),lisize,num);
            });
            
            
            function addlist(){
                for(i=0;i<addli;i++){
                    var html = a.find("ul li").eq(i).html();
                    a.find("ul").append("<li>"+html+"</li>");    
                }
                a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
                //console.log(a.find("ul li").size());
            }
            function photoscroll(){
                a.find(".ps_pre").on("click",function(){//console.log(num);    
                    now--;
                    if(now >= 0){                  
                        a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
                        btnshow(now,parseInt((lisize+addli)/num),lisize,num);
                    }
                });
    
                a.find(".ps_next").on("click",function(){//console.log(num);    
                    now++;
                    if(now < (lisize+addli)/num){    
                        a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
                        btnshow(now,parseInt((lisize+addli)/num),lisize,num);
                    }    
                });    
                btnshow(now,parseInt((lisize+addli)/num),lisize,num);        
            }
            /***
            参数说明:
            now:当前是第几组,默认是0
            c:总共有几组
            d:初始化时li的个数
            e:每组显示li个数
            ***/
            function btnshow(now,c,d,e){
                if(d<=e){//如果初始化时li的个数小于一组要显示的数,则不显示pre和next按钮
                    a.find(".ps_next").hide();
                    a.find(".ps_pre").hide();
                }else if(now==0){//初始化now=0,显示第一组,只显示next
                    a.find(".ps_next").show();
                    a.find(".ps_pre").hide();    
                }else if(now==c-1){//显示到最后一组,只显示pre
                    a.find(".ps_next").hide();
                    a.find(".ps_pre").show();    
                }else{//显示中间组,pre和next都需要显示
                    a.find(".ps_next").show();
                    a.find(".ps_pre").show();
                }
            }
            
        }
    })(jQuery); 
    $.photolist($("#activity-slide"));
    </script>
    View Code

    css部分:

    @charset "utf-8";
    body, div, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, code, form, fieldset, legend, button, textarea, table, tbody, tfoot, thead, th, td, article, aside, dialog, figure, footer, header, hgroup, menu, nav, section, time, mark, audio, video { margin: 0; padding: 0; outline:nonebackground:transparent;
    }
    article, aside, dialog, figure, footer, header, hgroup, nav, section { display: block; }
    body, button, input, select, textarea { font: 12px/1.5 arial, 5b8b4f53, sans-serif; }
    h1, h2, h3, h4, h5, h6, button, input, select, textarea { font-size: 100%; outline: none }
    address, cite, dfn, em, var { font-style: normal; }
    code, kbd, pre, samp { font-family: courier new, courier, monospace; }
    small { font-size: 12px; }
    ul, ol, li { list-style: none; }
    img { border: none; }
    a { text-decoration: none; outline: thin none; }
    a:hover { text-decoration: underline; }
    table { border-collapse: collapse; border-spacing: 0; }
    .clear { clear: both; }
    .clearfix:after { visibility: hidden; display: block; font-size: 0; content: " "; clear: both; height: 0; }
    html { -webkit-text-size-adjust: none; }
    body { font: 12px/1.5 5FAE8F6F96C59ED1, tahoma, arial, 5b8b4f53, sans-serif; }
    
    
    
    
    
    .grid-960 .wapper { width: 100%; min-width:960px;height: auto; margin: 0 auto; background: url(../images/bg-body-960.jpg) no-repeat center top; }
    .grid-1180 .wapper { width: 100%; min-width:1180px;height: auto; margin: 0 auto; background: url(../images/bg-body-1180.jpg) no-repeat center top; }
    .grid-1410 .wapper { width: 100%; min-width:1410px;height: auto; margin: 0 auto; background: url(../images/bg-body-1410.jpg) no-repeat center top; }
    
    /*热门活动*/
    .grid-960 .section { width: 960px;  margin: 0 auto;background-color:#eaf2ff; }
    .grid-1180 .section { width: 1180px;  margin: 0 auto;background-color:#eaf2ff;}
    .grid-1410 .section { width: 1410px;  margin: 0 auto;background-color:#eaf2ff;}
    
    .title{padding:0 102px;height:70px;line-height:70px;font-size:24px;font-weight:normal;color:#fff;text-shadow: 0 3px #df2828, 3px 0 #df2828;background:#cc2223 url(../images/bg-title.jpg) no-repeat left top;}
    
    .viewall:hover{text-decoration:none;}
    .viewall{font-size:18px;;color:#fff;text-shadow: 0 3px #df2828, 3px 0 #df2828;float:right;}
    
    .grid-1410 .title {padding:0 116px;background-image:url(../images/bg-title-1410.jpg);}
    
    .grid-960 .contentwrap{width:800px;margin:0 auto;}
    .grid-1180 .contentwrap{width:980px;margin:0 auto;}
    .grid-1410 .contentwrap{width:1180px;margin:0 auto;}
    
    .grid-960 .activity{width:826px;height:152px;overflow:hidden;margin:0 auto;position:relative;}
    .grid-1180 .activity{width:1020px;height:192px;overflow:hidden;margin:0 auto;position:relative;}
    .grid-1410 .activity{width:1230px;height:232px;overflow:hidden;margin:0 auto;position:relative;}
    
    .grid-960 .activity ul{height:152px;overflow:hidden;}
    .grid-1180 .activity ul{height:192px;overflow:hidden;}
    .grid-1410 .activity ul{height:232px;overflow:hidden;}
    
    .activity li img{display:block;width:100%;height:100%;}
    .activity li{display:block;float:left;}
    
    .grid-960 .activity li{width:250px;height:125px;overflow:hidden;margin:12px;}
    .grid-1180 .activity li{width:300px;height:150px;overflow:hidden;margin:20px;}
    .grid-1410 .activity li{width:360px;height:180px;overflow:hidden;margin:25px;}
    /*js切换*/
    .pg_left,.pg_right {position: absolute;z-index: 999;width: 35px;height: 50px;overflow: hidden;}
    .pg_right {background: transparent url(../images/pg_right.png) no-repeat scroll 5px 7px;}
    .pg_right:hover {background: transparent url(../images/hover.png) no-repeat scroll 0 0;}
    .grid-960 .pg_right{top:75px;right:16px;margin-top:-25px;}
    .grid-1180 .pg_right{top:95px;right:20px;margin-top:-25px;}
    .grid-1410 .pg_right{top:115px;right:25px;margin-top:-25px;}
    
    .pg_left {background: transparent url(../images/pg_left.png) no-repeat scroll 5px 7px;}
    .pg_left:hover {background: transparent url(../images/hover.png) no-repeat scroll right 0;}
    .grid-960 .pg_left{top:75px;left:13px;margin-top:-25px;}
    .grid-1180 .pg_left{top:95px;left:20px;margin-top:-25px;}
    .grid-1410 .pg_left{top:115px;left:25px;margin-top:-25px;}
    View Code

    本文作者starof,因知识本身在变化,作者也在不断学习成长,文章内容也不定时更新,为避免误导读者,方便追根溯源,请诸位转载注明出处:http://www.cnblogs.com/starof/p/4956293.html有问题欢迎与我讨论,共同进步。

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  • 原文地址:https://www.cnblogs.com/starof/p/4956293.html
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