ASP.NET实例教程:51job网站地区选择功能

文章出处:it560.com 作者:Andy Lau 发布时间:2010-02-01

最终效果图:

难点: 定位,其实不难, 取得父元素(省)的位置,然后设置 市(初始隐藏)的位置 = 父元素位置偏移n个px

id为pop 的div是模式窗口

说一下流程吧

1.ajax读出所有省市

2.市放在一个div里面,初始是隐藏的,然后给每一个省加一个onclick事件,控制这个省的市显示还是隐藏

3.完成。

说得简单了点,不过看代码就看明白了!有不明白可以在这里留言,我会关注!

html代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="test_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
    <script type="text/javascript" src="../js/jquery-1.3.2.min.js"></script>
   
    <script>
    var xmlHttp;
function createXMLHttpRequest()
{
    if(window.ActiveXObject)
    {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else if(window.XMLHttpRequest)
    {
        xmlHttp = new XMLHttpRequest();
    }
}
function startRequest()
{
    createXMLHttpRequest();
    try
    {      
        xmlHttp.onreadystatechange = handleStateChange;
        xmlHttp.open("GET", "Default.aspx?ct=1", true);
        xmlHttp.send(null);
    }
    catch(exception )
    {
    alert(exception);
        alert("请稍候再试!");
    }
}
function handleStateChange()
{   
    if(xmlHttp.readyState == 4)
    {       
        if (xmlHttp.status == 200 || xmlHttp.status == 0)
        {  
            var param = xmlHttp.responseText;  
            $("#divlist").append(param);
            alert(param);
        }
    }
}
 function cc(){
    $('#divdialog').fadeIn('fast');
    $('#pop').css({'width': '100%','height': '100%','display': 'inline'});
    startRequest();
    }
   
    function selectitem(obj){
    $("#txt1").val(obj);
    }
 
    function showc(obj,objname){
    if($("#divct"+obj).text() == ""){
    selectitem(objname); //如果没有市,就选择省
    }else{
      var pos = $("#apro"+obj).position();   //父元素位置  
      var left = pos.left+40+ "px"; //偏移量
      var top = pos.top+15+ "px";
      $("#divct"+obj).css({
        "top": top,
        "left":left,
        "background":"#F3FBEA",
        "color":"#666600"
    }).show();
   
    setTimeout(hidect2(obj),4000);//4秒定时关闭
    }  
    }
   
    function hidect(obj){
    $("#divct"+obj).hide();
    }
    function hidect2(obj){
    return function(){hidect(obj);}
    }
    function closect(){
    $("#divdialog").hide();
    $('#pop').css({'width': '0','height': '0','display': 'none'});
    }
  
  
   
    </script>
   
<style>
.proul{list-style:none}
.proul li{width:100px;height:30px;float:left; cursor:pointer}
.ctul{list-style:none}
.ctul li{width:100px;height:30px;float:left; cursor:pointer}
.ctdiv{display:none;position: absolute; border:1px #666600 solid; width:auto; height:auto}
.dtl{font-size:12px; color:White; font-weight:bold; cursor:pointer}
.f_r{float:right}
.f_l{float:left}
</style>
</head>
<body>

    <form id="form1" runat="server">
   
        <input id="Button1" type="button" value="选择地区" onclick="cc();" />
    <div id="pop" style="background-color:#000000;position: absolute ;top:0;left:0;z-index:1;display:none;filter:Alpha(opacity=30);"></div>
   
    <div id="divdialog" style="border: #4b8500 1px solid;display: none; left: 217px; background-image: url(../images/t_bg.jpg); width: 477px;  background-repeat: repeat-x;
        position: absolute; top: 172px; height: 350px; background-color: #faffeb; z-index:99999">
        <div style="padding-right: 5px; overflow: hidden; line-height: 25px; height: 25px;text-align: right">
            <span  style="float: left; padding:4px 0px 4px 0px" ><img src="../images/t_bg_l.gif" width="16" height="16" /></span>
            <span class="dtl f_l">请选择地区</span>           
            <span onclick="closect();" class="dtl f_r">[关闭]</span>
               <span onclick="closect();$('#txt1').val('不限');" class="dtl f_r">[不限]</span>
        </div>
        <div id="divlist" style="font-size: 12px; margin: 0px auto; width: 462px; color: #000; height:320px; overflow:scroll; text-align:left" runat="server">
           
            </div>
           
    </div>
        <input id="txt1" type="text" />
    </form>
</body>
</html>

后台输出代码

private void Bind()
    {
        IList
<heyjob.Model.c_Province> listP = bllP.DataTableToList(bllP.GetAllList().Tables[0]);
        
string arr = string.Empty;
        
string ct = string.Empty;
        
for (int i = 0; i < listP.Count; i++)
        {
            IList
<heyjob.Model.c_City> listC = bllC.DataTableToList(bllC.GetList("provinceid='" + listP[i].ProvinceID + "'").Tables[0]);

            arr 
+= "<ul class='proul'><div id='divpro" + listP[i].ProvinceID + "'>";
            arr 
+= "<li><a id='apro" + listP[i].ProvinceID + "' onclick=showc('" + listP[i].ProvinceID + "'" +",'" + listP[i].ProvinceName + "');>" + listP[i].ProvinceName + "</a></li>";
            arr 
+= "</div></ul>";

            ct 
+= "<div class='ctdiv' id='divct" + listP[i].ProvinceID + "'><ul class='ctul'>";
            
for (int j = 0; j < listC.Count; j++)
            {
                
if (listC.Count > 0)
                {
                    
if (listC[j].ProvinceID == listP[i].ProvinceID)
                    {
                        
if (j == 0)
                        {
                            ct 
+= listP[i].ProvinceName + "<br/><br/>";
                        }
                        ct 
+= "<li><a onclick=selectitem('" + listC[j].CityName + "');>" + listC[j].CityName + "</a></li>";
                    }
                }
            }
            ct 
+= "</ul></div>";
            arr 
+= ct;

        }

        Response.Write(arr);
        Response.End();
    }

原作者:Andy Lau文章出自: www.it560.com