另类无刷新、联动下拉列表框(二级+XMLHttpRequest)
2006-05-25 01:50
573 查看
二级的联动下拉列表,从思路上讲,大致分下列几步:
一:触发第一个下拉列表的onchange事件。
二:异步调用处理页后,会返回处理请求后的信息(服务器端用Response.Write方法写入要返回的字符串,客户端用responseText属性接收字符串。
三:用得到的字符串处理后更新第二个下拉列表框
主要代码如下:
一:建立读取XML的类,这里也可以是数据库的查询
public class ReadXmlCS
{
public const string k = "|";
public const string s = ",";
public ReadXmlCS()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static string QueryXml(string filename,string querystr)// @"//Pro_class/@id"
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
System.Xml.XPath.XPathDocument myXPathDocument = new System.Xml.XPath.XPathDocument(filename);
System.Xml.XPath.XPathNavigator myXPathNavigator = myXPathDocument.CreateNavigator();
try
{
System.Xml.XPath.XPathNodeIterator myXPathNodeIterator = myXPathNavigator.Select(querystr);
while(myXPathNodeIterator.MoveNext())
{
sb.Append(myXPathNodeIterator.Current.Value.ToString() +",");//把属性值添加到字符串末尾,添加分组字符“,”
System.Xml.XPath.XPathNavigator myXPathNavigator2 = myXPathNodeIterator.Current.Clone();//克隆当前接点
// while(myXPathNavigator2.MoveToNextAttribute())//移动指针到下一个属性
// {
// sb.Append(myXPathNavigator2.Value.ToString()+"|");//把属性值添加到字符串末尾,添加分组字符“|”
// }
myXPathNavigator2.MoveToNextAttribute();
sb.Append(myXPathNavigator2.Value.ToString()+"|");
}
return sb.ToString();
}
catch{return null;}
}
public static void QueryXml(string filename,string querystr,System.Web.UI.WebControls.DropDownList dd)// @"//Pro_class/@id"
{
System.Xml.XPath.XPathDocument myXPathDocument = new System.Xml.XPath.XPathDocument(filename);
System.Xml.XPath.XPathNavigator myXPathNavigator = myXPathDocument.CreateNavigator();
try
{
System.Xml.XPath.XPathNodeIterator myXPathNodeIterator = myXPathNavigator.Select(querystr);
while(myXPathNodeIterator.MoveNext())
{
System.Web.UI.WebControls.ListItem li = new System.Web.UI.WebControls.ListItem();
li.Value = myXPathNodeIterator.Current.Value.ToString() ;//把属性值(id)添加到ListItem的“值”属性
System.Xml.XPath.XPathNavigator myXPathNavigator2 = myXPathNodeIterator.Current.Clone();//克隆当前接点
// while(myXPathNavigator2.MoveToNextAttribute())//移动指针到下一个属性
// {
// li.Text = myXPathNavigator2.Value.ToString();//把属性值(title)添加到ListItem的“文本”属性
// }
myXPathNavigator2.MoveToNextAttribute();
li.Text = myXPathNavigator2.Value.ToString();
dd.Items.Add(li);
}
}
catch{}
}
}
其中关键的步骤加了注释,其它的大家可以到MSDN上去查找。
二。实现 (WebForm8.aspx.cs页面):
protected System.Web.UI.WebControls.DropDownList DropDownList2;
protected System.Web.UI.WebControls.DropDownList Dropdownlist1;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
string str = this.Request.QueryString["querychild"];
if((str != null) && (str == "yes"))
{
string querystr = "//Pro_class[" + this.Request["parentid"] + "]/Pro_class_small/@id";
string show = zlp.str.ReadXmlCS.QueryXml(@"D:/Inetpub/wwwroot/zlp/XmlData/ProductMenu.xml",querystr);
this.Response.Write(show);
this.Response.End();
}
if(!this.IsPostBack)
{
this.BindDropDownList();//加载页面时,填充第一个下拉列表框
}
}
protected void BindDropDownList()
{
this.Dropdownlist1.Attributes.Add("onchange","javascript:XmlPost(this);"); //服务器端添加属性
zlp.str.ReadXmlCS.QueryXml(@"D:/Inetpub/wwwroot/zlp/XmlData/ProductMenu.xml",@"//Pro_class/@id",this.Dropdownlist1);
}
三:JS脚本(WebForm8.aspx页面)
不知道为什么,这里的JS脚本添加不进来,大家可以在事例下载中得到源码。
文章的结尾:
大家也可以把它添加到用户控件中或者是封装成自定义控件。
要是大家有更好的方法和建议,恳请通知我,欢迎指正,谢谢!
QQ:126083810
zlp8383178@163.com
事例演示:
http://j.thec.cn/zlp8383178/exmDropDownList/webform1.aspx
事例下载
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
一:触发第一个下拉列表的onchange事件。
二:异步调用处理页后,会返回处理请求后的信息(服务器端用Response.Write方法写入要返回的字符串,客户端用responseText属性接收字符串。
三:用得到的字符串处理后更新第二个下拉列表框
主要代码如下:
一:建立读取XML的类,这里也可以是数据库的查询
public class ReadXmlCS
{
public const string k = "|";
public const string s = ",";
public ReadXmlCS()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static string QueryXml(string filename,string querystr)// @"//Pro_class/@id"
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
System.Xml.XPath.XPathDocument myXPathDocument = new System.Xml.XPath.XPathDocument(filename);
System.Xml.XPath.XPathNavigator myXPathNavigator = myXPathDocument.CreateNavigator();
try
{
System.Xml.XPath.XPathNodeIterator myXPathNodeIterator = myXPathNavigator.Select(querystr);
while(myXPathNodeIterator.MoveNext())
{
sb.Append(myXPathNodeIterator.Current.Value.ToString() +",");//把属性值添加到字符串末尾,添加分组字符“,”
System.Xml.XPath.XPathNavigator myXPathNavigator2 = myXPathNodeIterator.Current.Clone();//克隆当前接点
// while(myXPathNavigator2.MoveToNextAttribute())//移动指针到下一个属性
// {
// sb.Append(myXPathNavigator2.Value.ToString()+"|");//把属性值添加到字符串末尾,添加分组字符“|”
// }
myXPathNavigator2.MoveToNextAttribute();
sb.Append(myXPathNavigator2.Value.ToString()+"|");
}
return sb.ToString();
}
catch{return null;}
}
public static void QueryXml(string filename,string querystr,System.Web.UI.WebControls.DropDownList dd)// @"//Pro_class/@id"
{
System.Xml.XPath.XPathDocument myXPathDocument = new System.Xml.XPath.XPathDocument(filename);
System.Xml.XPath.XPathNavigator myXPathNavigator = myXPathDocument.CreateNavigator();
try
{
System.Xml.XPath.XPathNodeIterator myXPathNodeIterator = myXPathNavigator.Select(querystr);
while(myXPathNodeIterator.MoveNext())
{
System.Web.UI.WebControls.ListItem li = new System.Web.UI.WebControls.ListItem();
li.Value = myXPathNodeIterator.Current.Value.ToString() ;//把属性值(id)添加到ListItem的“值”属性
System.Xml.XPath.XPathNavigator myXPathNavigator2 = myXPathNodeIterator.Current.Clone();//克隆当前接点
// while(myXPathNavigator2.MoveToNextAttribute())//移动指针到下一个属性
// {
// li.Text = myXPathNavigator2.Value.ToString();//把属性值(title)添加到ListItem的“文本”属性
// }
myXPathNavigator2.MoveToNextAttribute();
li.Text = myXPathNavigator2.Value.ToString();
dd.Items.Add(li);
}
}
catch{}
}
}
其中关键的步骤加了注释,其它的大家可以到MSDN上去查找。
二。实现 (WebForm8.aspx.cs页面):
protected System.Web.UI.WebControls.DropDownList DropDownList2;
protected System.Web.UI.WebControls.DropDownList Dropdownlist1;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
string str = this.Request.QueryString["querychild"];
if((str != null) && (str == "yes"))
{
string querystr = "//Pro_class[" + this.Request["parentid"] + "]/Pro_class_small/@id";
string show = zlp.str.ReadXmlCS.QueryXml(@"D:/Inetpub/wwwroot/zlp/XmlData/ProductMenu.xml",querystr);
this.Response.Write(show);
this.Response.End();
}
if(!this.IsPostBack)
{
this.BindDropDownList();//加载页面时,填充第一个下拉列表框
}
}
protected void BindDropDownList()
{
this.Dropdownlist1.Attributes.Add("onchange","javascript:XmlPost(this);"); //服务器端添加属性
zlp.str.ReadXmlCS.QueryXml(@"D:/Inetpub/wwwroot/zlp/XmlData/ProductMenu.xml",@"//Pro_class/@id",this.Dropdownlist1);
}
三:JS脚本(WebForm8.aspx页面)
不知道为什么,这里的JS脚本添加不进来,大家可以在事例下载中得到源码。
文章的结尾:
大家也可以把它添加到用户控件中或者是封装成自定义控件。
要是大家有更好的方法和建议,恳请通知我,欢迎指正,谢谢!
QQ:126083810
zlp8383178@163.com
事例演示:
http://j.thec.cn/zlp8383178/exmDropDownList/webform1.aspx
事例下载
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
function XmlPost(obj)
{
var url = "?querychild=yes";
var data = "&parentid=" + obj.value;
Request.sendPOST(url,data,loginResult);
}
function loginResult(response)
{
/*var root = response.responseXML.selectSingleNode("//Pro_class_small[@id]");*/
var root = response.responseText;
/*alert(root);*/
if(root != "")
{
document.all("DropDownList2").length=0;
var piArray = root.split("|");
for(var i=0;i
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