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Basic Ajax tutorial (6) _ tips for creating a tool

Source: Internet
Author: User
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<! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN">

<Html> <Title> Ajax Tool Tip </title>
<Script type = "text/javascript">
Var xmlHttp;
Var dataDiv;
Var dataTable;
Var dataTableBody;
Var offsetEl;
Function createXMLHttpRequest (){
If (window. ActiveXObject ){
XmlHttp = new ActiveXObject ("Microsoft. XMLHTTP ");
} Else if (window. XMLHttpRequest ){
XmlHttp = new XMLHttpRequest ();
}
}

Function initVars (){
DataTableBody = document. getElementByIdx_x ("courseDataBody ");
DataTable = document. getElementByIdx_x ("courseData ");
DataDiv = document. getElementByIdx_x ("popup ");
}

Function getCourseData (element ){
InitVars ();
CreateXMLHttpRequest ();
OffsetEl = element;
Var url = "Handler. ashx? Key = "+ escape (element. id );
XmlHttp. open ("GET", url, true );
XmlHttp. onreadystatechange = callback;
XmlHttp. send (null );
}
 
Function callback (){
If (xmlHttp. readyState = 4 ){
If (xmlHttp. status = 200 ){
SetData (xmlHttp. responseXML );
}
}
}

Function setData (courseData ){
ClearData ();
SetOffsets ();
Var length = courseData. getElementsByTagName_r ("length") [0]. firstChild. data;
Var par = courseData. getElementsByTagName_r ("par") [0]. firstChild. data;
Var row, row2;
Var parData = "Par:" + par
Var lengthData = "Length:" + length;
Row = createRow (parData );
Row2 = createRow (lengthData );
DataTableBody. appendChild_xss (row );
DataTableBody. appendChild_xss (row2 );
}
 
Function createRow (data ){
Var row, cell, txtNode;
Row = document. createElement_x ("tr ");
Cell = document. createElement_x ("td ");
Cell. setAttribute ("bgcolor", "# FFFAFA ");
Cell. setAttribute ("border", "0 ");
TxtNode = document. createTextNode (data );
Cell. appendChild_xss (txtNode );
Row. appendChild_xss (cell );
Return row;
}

Function setOffsets (){
Var end = offsetEl. offsetWidth;
Var top = calculateOffsetTop (offsetEl );
DataDiv. style. border = "black 1px solid ";
DataDiv. style. left = end + 15 + "px ";
DataDiv. style. top = top + "px ";
}

Function calculateOffsetTop (field ){
Return calculateOffset (field, "offsetTop ");
}

Function calculateOffset (field, attr ){
Var offset = 0;
While (field ){
Offset + = field [attr];
Field = field. offsetParent;
}
Return offset;
}
Function clearData (){
Var ind = dataTableBody. childNodes. length;
For (var I = ind-1; I> = 0; I --){
DataTableBody. removeChild (dataTableBody. childNodes [I]);
}
DataDiv. style. border = "none ";
} </Script>

<Body>
<H1> Ajax Tool Tip Example <H3> Golf Courses <Table id = "courses" bgcolor = "# FFFAFA" border = "1" cellspacing = "0" cellpadding = "2"/>
<Tbody>
<Tr> <td id = "1" onmouseover = "getCourseData (this);" onmouseout = "clearData ();"> Augusta National </td> </tr>
<Tr> <td id = "2" onmouseover = "getCourseData (this);" onmouseout = "clearData ();"> pinehirst No. 2 </td> </tr>
<Tr> <td id = "3" onmouseover = "getCourseData (this);" onmouseout = "clearData ();"> St. Andrews Links </td> </tr>
<Tr> <td id = "4" onmouseover = "getCourseData (this);" onmouseout = "clearData ();"> Baltusrol Golf Club </td> </tr>
</Tbody>
</Table>
<Div style = "position: absolute;" id = "popup">
<Table id = "courseData" bgcolor = "# FFFAFA" border = "0" ellspacing = "2" cellpadding = "2"/>
<Tbody id = "courseDataBody"> </tbody> </table>
</Div> </body>

</Html>
CourseData class

Using System;
Using System. Data;
Using System. Configuration;
Using System. Linq;
Using System. Web;
Using System. Web. Security;
Using System. Web. UI;
Using System. Web. UI. HtmlControls;
Using System. Web. UI. WebControls;
Using System. Web. UI. WebControls. WebParts;
Using System. Xml. Linq;

/// <Summary>
/// Summary of CourseData
/// </Summary>
Public class CourseData
{
Public CourseData ()
{
//
// TODO: add the constructor logic here
//
}
Private int par;
Private int length;
Public CourseData (int par, int length) {this. par = par; this. length = length ;}
Public int getPar () {return this. par ;}
Public int getLength () {return this. length ;}
}

Handler. ashx

 

<% @ WebHandler Language = "C #" class = "Handler" %>

Using System;
Using System. Web;
Using System. Collections;

Public class Handler: IHttpHandler {
Private Hashtable courses = new Hashtable ();
Public void ProcessRequest (HttpContext context ){

CourseData augusta = new CourseData (72,729 0 );
CourseData pinehirst = new CourseData (70,721 4 );
CourseData standrews = new CourseData (72,656 6 );
CourseData maid = new CourseData (70,739 2 );
Courses. Add (1, augusta );
Courses. Add (2, pinehirst );
Courses. Add (3, standrews );
Courses. Add (4, baltusrol );

Int key = int. Parse (context. Request. QueryString ["key"]);
CourseData data = (CourseData) courses [key];
Context. Response. ContentType = "text/xml ";
Context. Response. AddHeader ("Cache-Control", "no-cache ");
Context. Response. Write ("<response> ");
Context. Response. Write ("<par>" + data. getPar () + "</par> ");
Context. Response. Write ("<length>" + data. getLength () + "</length> ");
Context. Response. Write ("</response> ");
Context. Response. End ();
}
 
Public bool IsReusable {
Get {
Return false;
}
}

}

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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