jQuery+ajax实现无刷新级联菜单示例

前台用AJAX直接调用后台方法，老有人发帖提问，没事做个示例

下面是做的一个前台用JQUERY，AJAX调用后台方法做的无刷新级联菜单

CasMenu.aspx页面：

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<html xmlns="http://www.w3.org/1999/xhtml">
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Porschev--<a href="/tag/qiantai/" target="_blank" class="keywords">前台</a>JS(Jquery)<a href="/tag/diaoyong/" target="_blank" class="keywords">调用</a><a href="/tag/houtai/" target="_blank" class="keywords">后台</a><a href="/tag/fangfa/" target="_blank" class="keywords">方法</a> 级联<a href="/tag/caidan/" target="_blank" class="keywords">菜单</a>@H_<a href="/tag/301/" target="_blank" class="keywords">301</a>_10@ <script src="js/jquery-1.3.2-vsdoc.js" mce_src="js/jquery-1.3.2-vsdoc.js" type="text/javascript"></mce:script> <script type="text/javascript"> $(function() { $("#selPro").change(function() { //省份下拉<a href="/tag/caidan/" target="_blank" class="keywords">菜单</a>的change事件 var params = '{str:"' + $(this).val() + '"}'; //此处参数名要注意和<a href="/tag/houtai/" target="_blank" class="keywords">后台</a><a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>参数名要一致 $.ajax({ type: "POST",//提交方式 url: "CasMenu.aspx/ShowCity",//提交的<a href="/tag/yemian/" target="_blank" class="keywords">页面</a>/<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>名 data: params,//参数（如果没有参数：null） dataType: "text",//类型 contentType: "application/json; charset=utf-8",beforeSend: function(XMLHttpRequest) { $('#tipsDiv').text("正在<a href="/tag/chaxun/" target="_blank" class="keywords">查询</a>..."); },success: function(msg) { $('#tipsDiv').text("<a href="/tag/chaxun/" target="_blank" class="keywords">查询</a>成功!"); $("#selCity option").each(function() { $(this).remove(); //移除原有项 }); $("<option value='0'>===请选择===</option>").appendTo("#selCity"); //<a href="/tag/tianjia/" target="_blank" class="keywords">添加</a>一个默认项 $(eval("(" + msg + ")").d).appendTo("#selCity"); //将返回来的项<a href="/tag/tianjia/" target="_blank" class="keywords">添加</a>到下拉<a href="/tag/caidan/" target="_blank" class="keywords">菜单</a>中 },error: function(xhr,msg,e) { alert("error"); } }); }); }); </script> </head> <body> <form id="form1" runat="server"> <div> Porschev--<a href="/tag/qiantai/" target="_blank" class="keywords">前台</a>JS(Jquery)<a href="/tag/diaoyong/" target="_blank" class="keywords">调用</a><a href="/tag/houtai/" target="_blank" class="keywords">后台</a><a href="/tag/fangfa/" target="_blank" class="keywords">方法</a> 级联<a href="/tag/caidan/" target="_blank" class="keywords">菜单</a><br /> <br /> <select id="selPro" name="selPro"> <%=strPro %> </select>省(直辖市) <select id="selCity" name="selCity"> <option value="0">===请选择===</option> </select>（市） </div> <div id="tipsDiv"> </div> </form> </body> </html> </pre> </div> <p><h3>CasMenu.aspx.cs</h3></p> <div class="jb51code"> <pre class="brush:csharp;"> using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using CasMenuModels; using CasMenuBLL; using System.Text; public partial class _Default : System.Web.UI.Page { public static string strPro = string.Empty; //省份下拉项 public static string strCity = string.Empty; //城市下拉项 protected void Page_Load(object sender,EventArgs e) { if (!IsPostBack) { } ShowPro(); } <h1>region##省份下拉列表框</h1> <p>/// <summary><br /> /// 省份下拉列表框<br /> /// </summary><br /> /// <returns></returns><br /> public string ShowPro()<br /> {<br /> StringBuilder str = new StringBuilder(); //得到所有省份集合<br /> List<CasMenuModels.Province> list = new CasMenuBLL.ProvinceManager().GetAllProvince(); //<a href="/tag/tianjia/" target="_blank" class="keywords">添加</a>一个初始项<br /> str.Append("<option value=\"");<br /> str.Append("0");<br /> str.Append("\">");<br /> str.Append("===请选择===");<br /> str.Append("</option>"); </p> <pre><code>//循环追加省份下拉项 foreach (CasMenuModels.Province p in list) { str.Append("<option value=\""); str.Append(p.ProvinceId); str.Append("\">"); str.Append(p.ProvinceName); str.Append("</option>"); } return strPro = str.ToString(); </code></pre> <p>} </p> <h1>endregion #region##城市下拉列表框</h1> <p>/// <summary><br /> /// 城市下拉列表框<br /> /// </summary><br /> /// <param name="str">省份ID</param><br /> /// <returns></returns><br /> [System.Web.Services.WebMethod()]<br /> public static string ShowCity(string str) //<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>是静态的<br /> {<br /> StringBuilder strCi = new StringBuilder();<br /> if (str == "0") //为初始项<br /> {<br /> strCi.Append("<option value=\"");<br /> strCi.Append("请选择");<br /> strCi.Append("\">");<br /> strCi.Append("请选择");<br /> strCi.Append("</option>");<br /> }<br /> else<br /> {<br /> List<CasMenuModels.City> list = new CasMenuBLL.CityManager().GetAllByProId(Convert.ToInt32(str)); //根据省份ID得到城市集合<br /> foreach (City c in list)<br /> {<br /> strCi.Append("<option value=\"");<br /> strCi.Append(c.CityId);<br /> strCi.Append("\">");<br /> strCi.Append(c.CityName);<br /> strCi.Append("</option>");<br /> }<br /> }<br /> return strCity = strCi.ToString();<br /> } </p> <h1>endregion</h1> <p>} </p> </pre> </div> <p>要注意的地方我都有注释，</p> <p>当然<a href="/tag/qiantai/" target="_blank" class="keywords">前台</a>调入<a href="/tag/houtai/" target="_blank" class="keywords">后台</a><a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>远不止这一种，比如还有AJAXPRO也很好用</p> <p>以上所述就是本文的全部<a href="/tag/neirong/" target="_blank" class="keywords">内容</a>了，希望大家能够喜欢。</p></div> <div class="topcard-tags"><a href="/tag/ajaxp/" class="tag_link" target="_blank">ajax</a><a href="/tag/jQuery/" class="tag_link" target="_blank">jQuery</a><a href="/tag/wushuaxinjiliancaidan/" class="tag_link" target="_blank">无刷新级联菜单</a></div> <ul class="list-group"> <li class="list-group-item"><a href="/ajax/54239.html" title="jQuery结合ajax实现动态加载文本内容">上一篇：jQuery结合ajax实现动态加载文本内</a><a href="/ajax/53972.html" title="jQuery取消ajax请求的方法" class="text-muted pull-right">下一篇：jQuery取消ajax请求的方法</a> </li> </ul> </div> </div> </div>  <div class="row row-sm"> <div class="col-sm-12 col-md-12 col-lg-12"> <div class="card"> <ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-4605373693034661" data-ad-slot="9144498553"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); 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