jquery拖拽效果

这个拖拽排序的效果的区别在于: 运用了插入insertBefore 和 insertAfter 的方法

步骤:

1.实现随鼠标移动的效果;

2.初始化一个元素及其坐标;

3.拖拽对象的最后坐标,与元素的坐标 进行计算和判断 来确定 要插入的目标元素;

4.用insertBefore 方法 插入到目标元素的前面

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>拖动</title>
    <script type="text/javascript" src="jquery-2.1.1.min.js"></script>
    <style type="text/css">
         body, div { margin: 0; paading: 0; font-size: 12px; }
         body { width: 960px; margin: 0 auto; }
         ul, li { margin: 0; padding: 0; list-style: none; }
        .clear { clear: both; width: 1px; height: 0px; line-height: 0px; font-size: 1px; }

        .box { width: 600px; height: auto; margin: 25px 0 0 0; padding: 5px; border: 1px solid #f00; }
        .main { position: static; width: 600px; height: 80px; margin-bottom: 5px; border: 1px solid blue; background: #ccc; }
        .maindash { position: absolute; width: 600px; height: 80px; margin-bottom: 5px; border: 1px dashed blue; background: #ececec; opacity: 0.7; }

        .hide { width: 600px; height: 80px; margin-bottom: 5px; }
        .dash { position: static; width: 600px; height: 80px; margin-bottom: 5px; border: 1px dashed #f00; }
        </style>

</head>
<body>
<script>
    $(document).ready( function () {

             var range = { x: 0, y: 0 };//鼠标元素偏移量
             var lastPos = { x: 0, y: 0, x1: 0, y1: 0 }; //拖拽对象的四个坐标
             var tarPos = { x: 0, y: 0, x1: 0, y1: 0 }; //目标元素对象的坐标初始化

             var theDiv = null, move = false;//拖拽对象 拖拽状态
             var theDivId =0, theDivHeight = 0, theDivHalf = 0; tarFirstY = 0; //拖拽对象的索引、高度、的初始化。
             var tarDiv = null, tarFirst, tempDiv;  //要插入的目标元素的对象, 临时的虚线对象

             $(".main").each(function(){
                     $(this).mousedown(function (event){
                             //拖拽对象
                             theDiv = $(this);

                             //鼠标元素相对偏移量
                             range.x = event.pageX - theDiv.offset().left;
                             range.y = event.pageY - theDiv.offset().top;

                             theDivId = theDiv.index();
                             theDivHeight = theDiv.height();
                             theDivHalf = theDivHeight/2;
                             move = true;

                             theDiv.attr("class","maindash");
                             // 创建新元素 插入拖拽元素之前的位置(虚线框)
                             $("<div class='dash'></div>").insertBefore(theDiv);

                         });
                 });

             $(document).mousemove(function(event) {

                     if (!move) return false;

                     lastPos.x = event.pageX - range.x;
                     lastPos.y = event.pageY - range.y;
                     lastPos.y1 = lastPos.y + theDivHeight;

                     // 拖拽元素随鼠标移动
                     theDiv.css({left: lastPos.x + 'px',top: lastPos.y + 'px'});
                     // 拖拽元素随鼠标移动 查找插入目标元素

                     var  $main = $('.main'); // 局部变量:按照重新排列过的顺序  再次获取 各个元素的坐标,
                     tempDiv = $(".dash"); //获得临时 虚线框的对象

                     $main.each(function () {
                            tarDiv = $(this);
                            tarPos.x = tarDiv.offset().left;
                            tarPos.y = tarDiv.offset().top;
                            tarPos.y1 = tarPos.y + tarDiv.height()/2;

                            tarFirst = $main.eq(0); // 获得第一个元素
                             tarFirstY = tarFirst.offset().top + theDivHalf ; // 第一个元素对象的中心纵坐标

                             //拖拽对象 移动到第一个位置
                             if (lastPos.y <= tarFirstY) {
                                         tempDiv.insertBefore(tarFirst);
                                 }
                             //判断要插入目标元素的 坐标后, 直接插入
                             if (lastPos.y >= tarPos.y - theDivHalf && lastPos.y1 >= tarPos.y1 ) {
                                     tempDiv.insertAfter(tarDiv);
                                 }

                         });

                 }).mouseup(function(event) {
                     theDiv.insertBefore(tempDiv);  // 拖拽元素插入到 虚线div的位置上
                     theDiv.attr("class", "main"); //恢复对象的初始样式
                    $('.dash').remove(); // 删除新建的虚线div
                    move=false;
                 });
         });
</script>
<div class="box" id="box">
         <div class="main" id="main0">div1</div>
         <div class="main" id="main1">div2</div>
         <div class="main" id="main2">div3</div>
         <div class="main" id="main3">div4</div>
         <div class="main" id="main4">div5</div>
         <div class="main" id="main5">div6</div>
         <div class="main" id="main6">div7</div>
</div>
</body>
</html>

有个小bug,这个bug产生的 原因是: 由于运用的jquery的链式方法。当鼠标mousemove的时候 才把 tempDiv = $('.dash'); 当鼠标不移动的时候,触发mouseup事件时,tempDiv .remove(); 这个tempDiv,是为空的,删除不了。所以才会产生点击一下,不拖动鼠标的时候删除不了div。改了“$('.dash').remove;” 就可以了

posted @ 2015-07-13 09:59  江湖丶丿新进程  阅读(187)  评论(0)    收藏  举报