jquery drag sorting example of elements_jquery
Complete code: (download at the end of the aspx file)
下边,我们一步一步来实现这个功能。
<span id="show"> <div> <input id="check" type="checkbox" /> </div> <div> <input type="hidden" id="orderlist" /> <ul id="list"> <asp:Repeater ID="rptOrder" runat="server"> <ItemTemplate> <li id="<%#Eval("ID") %>" title="<%#Eval("OrderID") %>"> <img alt="img" src="<%#Eval("Link") %>" /> </li> </ItemTemplate> </asp:Repeater> </ul> </div>
有一个单选框,当用户选中后,拖动图片时对数据库中数据排序进行更改。隐藏域保存原来的图片排列顺序。ul显示图片列表。
为了能看得过去,稍微加了点样式:
var show = jQuery("#show"); //输出提示 var orderlist = jQuery("#orderlist"); //原顺序 var check = jQuery("#check"); //是否更新到数据库
首先将常用的选择器保存下来,这样后边调用就变得比较简洁。这一部大家肯定没有问题。^_^
//保存原来的排列顺序 var order = []; list.children("li").each(function() { order.push(this.title); //原排列顺序保存在title,得到后更改title jQuery(this).attr("title", "你可以拖动进行排序"); }); orderlist.val(order.join(','));
保存原来的排列顺序到隐藏域。这里用到了数组的push()方法,就是将ul每个li中的title(原来的排列顺序)添加到数组中。最后用join()方法,得到了原排列顺序,返回一个字符串。现在排列顺序格式为1,2,3 。
//ajax更新 var Update = function(itemid, itemorder) { jQuery.ajax({ type: "post", url: "update.aspx", //id:新的排列对应的ID,order:原排列顺序 data: { id: itemid, order: orderlist.val() }, beforeSend: function() { show.html("正在更新"); }, success: function() { show.html("更新成功"); } }); };
接下来,将ajax更新块单独分出来。这样程序变得比较整洁,这块没有新东西。
//调用ajax更新方法 var Submit = function(update) { var order = []; list.children("li").each(function() { order.push(this.id); }); var itemid = order.join(','); //如果单选框选中,则更新表中排列顺序 if (update) { Update(itemid); } else { show.html(""); } };
和得到排列顺序类似,将ID组成一个字符串传递给了Update()方法。函数中的参数update为checkbox是否选中。
//执行排列操作 list.sortable({ opacity: 0.7, update: function() { Submit(check.attr("checked")); } });
最后,执行排列操作。后台部分就是对现在ID对应原来排列顺序的更新,相信大家并不陌生。
可以看出如果不进行数据库操作,该插件只需要调用sorttable便可完成对元素的拖动。

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