Home Web Front-end JS Tutorial jquery drag sorting example of elements_jquery

jquery drag sorting example of elements_jquery

May 16, 2016 pm 05:03 PM
drag sort

Complete code: (download at the end of the aspx file)

Copy code The code is as follows:






jquery学习-jquery对元素拖动排序













jQuery对元素拖动排序


拖动时同时更新数据库数据:






  • img



  • img



  • img







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>
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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
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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(','));
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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"); 
    } 
  }); 
};
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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(""); 
  } 
};
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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")); 
  } 
});
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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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