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My first Ajax Program

Source: Internet
Author: User
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Myfirstajax.htm:
<! Doctype HTML public "-// W3C // dtd html 4.0 transitional // en">
<HTML>
<Head>
<Title> my first Ajax </title>

<Script language = "JavaScript">
// ================================================ ========================================================== ======================================
VaR XMLHTTP;
Function createxmlhttprequest ()
{

If (window. activexobject)
XMLHTTP = new window. activexobject ("Microsoft. XMLHTTP ");
Else if (window. XMLHttpRequest)
XMLHTTP = new window. XMLHttpRequest ();

}


// ==================================== ========================================================== =====================================================< BR> function loadlist ()
{< br> createxmlhttprequest ();
XMLHTTP. onreadystatechange = handlestatechange_1;
XMLHTTP. open ("get", "data. XML ", true);
XMLHTTP. send (null);
}

Function handlestatechange_1 ()
{
If (XMLHTTP. readystate = 4)
{
If (XMLHTTP. Status = 200)
{
Try
{
Filllist ();
}
Catch (exception)
{
Alert ("error ");
}

}
}
}

Function addoption (list, text, value)
{
VaR Index = List. Options. length;
List. Options [Index] = New Option (text, value );
// List. selectedindex = index;
}

Function filllist ()
{
VaR xmldoc = XMLHTTP. responsexml;
VaR nodes = xmldoc. getelementsbytagname ("pro ");
For (I = 0; I <nodes. length; I ++)
{
VaR nodevalue = nodes [I]. getattribute ("name ");
Addoption (document. Ajax. Province, nodevalue, nodevalue );

}

}
// ================================================ ========================================================== ======================================
Function startrequest ()
{
Createxmlhttprequest ();
XMLHTTP. onreadystatechange = handlestatechange;
XMLHTTP. Open ("get", "data. xml", true );
XMLHTTP. Send (null );
}

Function handlestatechange ()
{
If (XMLHTTP. readystate = 4)
{
If (XMLHTTP. Status = 200)
{
Try
{
Simple (document. Ajax. province. selectedindex );
}
Catch (exception)
{
Alert ("error ");
}
}
}
}
Function simple (INDEX)
{
// Alert (document. Ajax. province. selectedindex); // selectedindex starts from 0. If not selected,-1 is returned.
If (Index =-1)
{
Document. Ajax. province. selectedindex = 0;
Index = 0;
}

VaR STR = "";
VaR pro = Document. Ajax. Name. value;
VaR xmldoc = XMLHTTP. responsexml;
VaR jiangnode = xmldoc. getelementsbytagname ("pro") [Index];
// Alert (jiangnode. getattribute ("name "));
STR = jiangnode. getattribute ("name") + ":"
VaR detailnode = jiangnode. getelementsbytagname ("detail ");
For (I = 0; I <detailnode. length; I ++)
{
If (I = 0)
{
STR = STR + detailnode [I]. childnodes [0]. nodevalue;
}
Else
{
STR = STR + "," + detailnode [I]. childnodes [0]. nodevalue;
}
}
Document. Ajax. Name. value = STR;
}
// ================================================ ========================================================== ======================================
Function re_size ()
{
// Alert (event. srcelement. Name );
If (event. srcelement. Name = "add ")
{
Document. Ajax. province. size = Document. Ajax. province. Size + 1;
}
Else if (event. srcelement. Name = "sub ")
{
If (document. Ajax. province. size> = 2)
Document. Ajax. province. size = Document. Ajax. province. Size-1;
}
}
</SCRIPT>

</Head>
<Body onload = "loadlist ()">

 

<Form action = # name = "ajax">
<Input type = button name = "add" value = "+" onclick = "re_size ()">
<Input type = button name = "sub" value = "-" onclick = "re_size ()">

<Br>
<Select name = "Province" size = 5>
</SELECT>
<Br>
<Input type = text name = "name" size = 50> </input>
<Input type = button value = "get" onclick = "startrequest ()"> </input>
</Form>

</Body>
</Html>

Data. xml:
<? XML version = "1.0" encoding = "gb2312"?>
<Root>
<Pro name = "Jiangsu Province">
<Detail> Nanjing </detail>
<Detail> Suzhou </detail>
<Detail> Wuxi </detail>
<Detail> Changzhou </detail>
<Detail> Zhenjiang </detail>
<Detail> Nantong </detail>
<Detail> Yangzhou </detail>
<Detail> Xuzhou </detail>
</Pro>
<Pro name = "Zhejiang Province">
<Detail> Hangzhou </detail>
<Detail> Ningbo </detail>
<Detail> Wenzhou </detail>
<Detail> Shaoxing </detail>
<Detail> Jiaxing </detail>
<Detail> Huzhou </detail>
</Pro>
<Pro name = "Fujian Province">
<Detail> Fuzhou </detail>
<Detail> Xiamen </detail>
</Pro>
<Pro name = "Guangdong Province">
<Detail> Guangzhou </detail>
<Detail> Shenzhen </detail>
<Detail> Dongguan </detail>
<Detail> Zhuhai </detail>
</Pro>
<Pro name = "Shandong Province">
<Detail> Jinan </detail>
<Detail> Qingdao </detail>
<Detail> Weihai </detail>
<Detail> Yantai </detail>
</Pro>
</Root>

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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