一般来说我们完全可以做一个html页面，而不用server page，但为了顺便说明怎样做组件，我决定作一个server control,先来看一下代码
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.ComponentModel;
namespace Michael.Web.UI.Controls
{
/// <summary>
/// Summary description for chat.
/// </summary>
[DefaultProperty("Text"),
ToolboxData("<{0}:chat runat=server></{0}:chat>")]
public class chat : System.Web.UI.WebControls.Table
{
private string doc;
private string text;
[Bindable(true),
Category("Appearance"),
DefaultValue("")]
public string Text
{
get
{
return text;
}
set
{
text = value;
}
}
/// <summary>
/// Render this control to the output parameter specified.
/// </summary>
/// <param name="output"> The HTML writer to write out to </param>
protected override void Render(HtmlTextWriter output)
{
// The script block is written to the client
output.Write(doc);
base.Render(output);
}
private string Serviceurl = "http://localhost/chat/ChatWebService.asmx?WSDL";
[Bindable(true),
Category("WebServiceProperty"),
DefaultValue("http://localhost/chat/ChatWebService.asmx?WSDL")]
public string ServiceURL
{
get
{
return Serviceurl;
}
set
{
Serviceurl = value;
}
}
private string Behaviorurl = "http://localhost/chat/webservice.htc";
[Bindable(true),
Category("WebServiceProperty"),
DefaultValue("")]
public string BehaviorURL
{
get
{
return Behaviorurl;
}
set
{
Behaviorurl = value;
}
}
private string tablecssclass;
[Bindable(true),
Category("LayoutProperty"),
DefaultValue("")]
public string TableCssClass
{
get
{
return tablecssclass;
}
set
{
tablecssclass = value;
}
}
private string titlecssclass;
[Bindable(true),
Category("LayoutProperty"),
DefaultValue("")]
public string TitleCssClass
{
get
{
return titlecssclass;
}
set
{
titlecssclass = value;
}
}
private string onlinecssclass;
[Bindable(true),
Category("LayoutProperty"),
DefaultValue("")]
public string OnlineCssClass
{
get
{
return onlinecssclass;
}
set
{
onlinecssclass = value;
}
}
private string msgcssclass;
[Bindable(true),
Category("LayoutProperty"),
DefaultValue("")]
public string MSGCssClass
{
get
{
return msgcssclass;
}
set
{
msgcssclass = value;
}
}
private string selusercssclass;
[Bindable(true),
Category("LayoutProperty"),
DefaultValue("")]
public string SelUserCssClass
{
get
{
return selusercssclass;
}
set
{
selusercssclass = value;
}
}
protected override void OnInit(EventArgs e)
{
this.ID = "service";
this.Style["Behavior"] = "url('" + Behaviorurl + "')";
this.Style["Table-Layout"] = "Fixed";
if( this.Attributes["class"] == null) this.Attributes["class"] = tablecssclass;
this.Attributes["onresult"] = UniqueID + "_onmyresult();";
TableRow tr;
// And also create 7 Table Cell elements one by one
TableCell cell = new TableCell();
cell.Attributes["class"] = titlecssclass;
cell.Attributes["Align"] = "Left";
// Set the caption of the control
cell.Text = "Portal 聊天室";
// Instantiate a Table Roa and attach the First Cell to it
tr = new TableRow();
tr.Cells.Add(cell);
// Add the Table Row to our Control
this.Rows.Add(tr);
// Row No 2 starts here
cell = new TableCell();
cell.Attributes["class"] = onlinecssclass;
cell.Text = "在线人员";
tr = new TableRow();
tr.Cells.Add(cell);
this.Rows.Add(tr);
// Row No 3 Starts here
cell = new TableCell();
cell.Style["Height"] = "25%";
// We create a DIV element using HtmlGenericControl object
// We can also do this using the Panel object
HtmlGenericControl d = new HtmlGenericControl("Div");
d.ID = UniqueID + "_ChatMsgs";
d.Style["Height"] = "100%";
d.Style["Width"] = "100%";
d.Style["Overflow"] = "Auto";
d.Style["Padding-Left"] = "15%";
d.ID = UniqueID + "_ChatList";
// Adding the DIV element to the Table Cell
cell.Controls.Add(d);
tr = new TableRow();
tr.Cells.Add(cell);
this.Rows.Add(tr);
// Row No 4 Starts here
cell = new TableCell();
cell.Attributes["class"] = msgcssclass;
cell.Text = "消息:";
tr = new TableRow();
tr.Cells.Add(cell);
this.Rows.Add(tr);
// Row No 5 starts here
cell = new TableCell();
cell.Style["Height"] = "35%";
d = new HtmlGenericControl("Div");
d.ID = UniqueID + "_ChatMsgs";
d.Style["Height"] = "100%";
d.Style["Width"] = "100%";
d.Style["Overflow"] = "Auto";
cell.Controls.Add(d);
tr = new TableRow();
tr.Cells.Add(cell);
this.Rows.Add(tr);
// Row No 6 Starts here
cell = new TableCell();
cell.Attributes["class"] = selusercssclass;
cell.ID = UniqueID + "_Prompt";
cell.Text = "选择一个用户:";
tr = new TableRow();
tr.Cells.Add(cell);
this.Rows.Add(tr);
// Row No 7 starts here
cell = new TableCell();
cell.Text = "<INPUT Type=\"Text\" id= '" + UniqueID + "_UserInput'> \r\n";
cell.Text += "<BR>\r\n";
cell.Text += "<Button id = '" + UniqueID + "_bnSendMsg' onclick = \"return SendMsg();\" class = " + UniqueID + "_TitleLabel style = \"display:none\"> 发送 </Button>\r\n";
cell.Text += "<Button id = '" + UniqueID + "_bnSelectName' onclick = \"return " + UniqueID + "_SelectName();\" class = " + UniqueID + "_TitleLabel style = \"display:block\"> 登陆 </Button> \r\n";
cell.Style["Color"] = "Black";
cell.Style["Background-Color"] = "Gainsboro";
tr = new TableRow();
tr.Cells.Add(cell);
this.Rows.Add(tr);
// First script Block is written into 'doc' variable
doc = "\r\n<SCRIPT FOR = 'window' EVENT = 'onload()'>";
doc += "//alert(\"done\"); \r\n";
doc += "service.use(\"";
doc += Serviceurl + "\",\"ChatWebService\"); \r\n";
doc += "" + UniqueID + "_UserInput.focus();\r\n";
doc += "</SCRIPT> \r\n";
// Then the second script block follows
doc += "<script language=\"JavaScript\">\r\n";
doc += "var " + UniqueID + "_iCallID1, " + UniqueID + "_iCallID2, " + UniqueID + "_iCallID3; \r\n";
doc += "var " + UniqueID + "_NickName; \r\n";
doc += "var " + UniqueID + "_MsgXML = new ActiveXObject(\"MSXML.DOMDocument\");\r\n";
doc += "function " + UniqueID + "_SelectName() \r\n";
doc += "{ \r\n";
doc += "if (" + UniqueID + "_UserInput.value == \"\") return false;\r\n";
doc += "" + UniqueID + "_NickName = " + UniqueID + "_UserInput.value; \r\n";
doc += "" + UniqueID + "_bnSelectName.disabled = 'true'; \r\n";
doc += "" + UniqueID + "_UserInput.disabled = 'true';\r\n";
doc += "" + UniqueID + "_iCallID1 = service.ChatWebService.call(\"Login\"," + UniqueID + "_NickName); \r\n";
doc += "} \r\n";
doc += "function " + UniqueID + "_onmyresult() \r\n";
doc += "{ \r\n";
doc += "if((event.result.error)&&(" + UniqueID + "_iCallID1==event.result.id)) \r\n";
doc += "{ \r\n";
doc += "var xfaultcode = event.result.errorDetail.code; \r\n";
doc += "var xfaultstring = event.result.errorDetail.string; \r\n";
doc += "var xfaultsoap = event.result.errorDetail.raw;\r\n";
doc += "\r\n";
doc += "// Add code to output error information here\r\n";
doc += "alert(xfaultstring);\r\n";
doc += "" + UniqueID + "_bnSelectName.disabled = false;\r\n";
doc += "" + UniqueID + "_UserInput.disabled = false; \r\n";
doc += "" + UniqueID + "_UserInput.focus();\r\n";
doc += "\r\n";
doc += "} \r\n";
doc += "else if((!event.result.error)&&(" + UniqueID + "_iCallID1==event.result.id)) \r\n";
doc += "{ \r\n";
doc += "" + UniqueID + "_ChatList.innerText= event.result.value; \r\n";
doc += "" + UniqueID + "_ChatList.scrollTop = 2000; \r\n";
doc += "" + UniqueID + "_bnSelectName.style.display = 'none';\r\n";
doc += "" + UniqueID + "_bnSendMsg.style.display = 'block';\r\n";
doc += "" + UniqueID + "_UserInput.value = \"\"; \r\n";
doc += "" + UniqueID + "_UserInput.disabled = false; \r\n";
doc += "" + UniqueID + "_UserInput.focus();\r\n";
doc += "" + UniqueID + "_Prompt.innerText = " + UniqueID + "_NickName + \" 说:\"; \r\n";
doc += "window.setTimeout('" + UniqueID + "_iCallID2 = service.ChatWebService.call(\"GetMsgs\"," + UniqueID + "_NickName);',3000); \r\n";
doc += "} \r\n";
doc += "else if((event.result.error)&&(" + UniqueID + "_iCallID2==event.result.id))\r\n";
doc += " {\r\n";
doc += "var xfaultcode = event.result.errorDetail.code; \r\n";
doc += "var xfaultstring = event.result.errorDetail.string; \r\n";
doc += "var xfaultsoap = event.result.errorDetail.raw;\r\n";
doc += "// Add code to output error information here\r\n";
doc += "alert(\"xfaultstring\");\r\n";
doc += " }\r\n";
doc += " else if((!event.result.error)&&(" + UniqueID + "_iCallID2==event.result.id))\r\n";
doc += " {\r\n";
doc += "var xmlResult = event.result.raw.xml; \r\n";
doc += " if (xmlResult != \"\" && xmlResult != null)\r\n";
doc += " {\r\n";
doc += "\r\n";
doc += "" + UniqueID + "_MsgXML.loadXML(xmlResult);\r\n";
doc += " " + UniqueID + "_ChatList.innerText = " + UniqueID + "_MsgXML.selectSingleNode(\"//UserList\").text; \r\n";
doc += "" + UniqueID + "_ChatList.scrollTop = 2000; \r\n";
doc += " " + UniqueID + "_ChatMsgs.innerHTML += " + UniqueID + "_MsgXML.selectSingleNode(\"//Messages\").text;\r\n";
doc += "" + UniqueID + "_ChatMsgs.scrollTop = 2000; \r\n";
doc += " }\r\n";
doc += " window.setTimeout('" + UniqueID + "_iCallID2 = service.ChatWebService.call(\"GetMsgs\"," + UniqueID + "_NickName);',3000);\r\n";
doc += " }\r\n";
doc += "else if((event.result.error)&&(" + UniqueID + "_iCallID3==event.result.id))\r\n";
doc += " {\r\n";
doc += "var xfaultcode = event.result.errorDetail.code; \r\n";
doc += "var xfaultstring = event.result.errorDetail.string; \r\n";
doc += "var xfaultsoap = event.result.errorDetail.raw;\r\n";
doc += "// Add code to output error information here\r\n";
doc += "alert(\"xfaultstring\");\r\n";
doc += " }\r\n";
doc += " else if((!event.result.error)&&(" + UniqueID + "_iCallID3==event.result.id))\r\n";
doc += " {\r\n";
doc += "var xmlResult = event.result.raw.xml; \r\n";
doc += " if (xmlResult != \"\" && xmlResult != null)\r\n";
doc += " {\r\n";
doc += "\r\n";
doc += "" + UniqueID + "_MsgXML.loadXML(xmlResult);\r\n";
doc += " " + UniqueID + "_ChatList.innerText = " + UniqueID + "_MsgXML.selectSingleNode(\"//UserList\").text; \r\n";
doc += " " + UniqueID + "_ChatMsgs.innerHTML += " + UniqueID + "_MsgXML.selectSingleNode(\"//Messages\").text;\r\n";
doc += " " + UniqueID + "_ChatList.scrollTop = 2000; \r\n";
doc += " " + UniqueID + "_bnSendMsg.disabled = false;\r\n";
doc += " " + UniqueID + "_ChatMsgs.scrollTop = 2000; \r\n";
doc += " " + UniqueID + "_UserInput.value = \"\";\r\n";
doc += " " + UniqueID + "_UserInput.disabled = false;\r\n";
doc += " " + UniqueID + "_UserInput.focus();\r\n";
doc += " }\r\n";
doc += " window.setTimeout('" + UniqueID + "_iCallID2 = service.ChatWebService.call(\"GetMsgs\"," + UniqueID + "_NickName);',3000);\r\n";
doc += " }\r\n";
doc += "} \r\n";
doc += "function SendMsg()\r\n";
doc += "{ \r\n";
doc += "if (" + UniqueID + "_UserInput.value == \"\") return false;\r\n";
doc += "" + UniqueID + "_bnSendMsg.disabled = 'true';\r\n";
doc += "" + UniqueID + "_UserInput.disabled = 'true';\r\n";
doc += "" + UniqueID + "_iCallID3 = service.ChatWebService.call(\"XchangeMsgs\"," + UniqueID + "_NickName," + UniqueID + "_UserInput.value);\r\n";
doc += "} \r\n";
doc += "</script> \r\n";
}
}
}
这里有几个问题，
1。我们继承的是Table，记住table等server端控件本身就继承了control类，我们做控件不一定要直接继承control
2。[“。。。”]是metadata他是用来做可视化控件的具体含义看msdn
3。我们这里采用client script的方法，可以看出实现方式与asp中大体一致，即Server端“写”script
4。Dhtml Behavior的应用，Behavior是MS扩展的css元素，大家可去msdn查