jQuery拖拽排序

修改了原文章一个致命bug,以及删除了认为多余的代码,下一步就是实现数据异步提交了

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery拖拽</title>
<style type="text/css">
body, div { margin: 0; paading: 0; font-size: 12px;user-select: none;}
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; }

.dash { width: 600px; height: 80px; margin-bottom: 5px; border: 1px dashed #f00; display:block;};
</style>
<script type="text/javascript" src="jquery-3.3.1.min.js"></script>
<script type="text/javascript">

$(document).ready( function () {

    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 theDivHeight = 0, tarFirstY = 0; //拖拽对象的索引、高度、的初始化。
    var tarDiv = null, tarFirst = null;  //要插入的目标元素的对象, 临时的虚线对象
    var tempDiv =  $("<div class='dash'></div>"); //虚线框对象
    
        $(".main").mousedown(function (event){
            //拖拽对象
            theDiv = $(this);
           
            theDivHeight = theDiv.height();
            move = true;
            theDiv.attr("class","maindash");
			
			theDiv.css({top: event.pageY-theDivHeight/2});
            tempDiv.insertBefore(theDiv);
                   
        });
    
   
    $(document).mousemove(function(event) {
   
        if (!move) return false;

        lastPos.y = event.pageY - theDivHeight/2;
        lastPos.y1 = lastPos.y + theDivHeight;
       
        // 拖拽元素随鼠标移动
        theDiv.css({top: lastPos.y});
        // 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,
       
        $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 + theDivHeight/2 ; // 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 - theDivHeight/2 && 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
        theDiv =null; //用完的对象记得释放
        tempDiv.remove(); // 删除新建的虚线div
        move=false;
       
    });
   
});


</script>
</head>

<body> 
<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>
</body>
</html>

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转载自blog.csdn.net/n994298535/article/details/80766681