AJAX ResponseXML Example

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AJAX Basic
AJAX HOME
AJAX Intro
AJAX HTTP Request
AJAX Example
AJAX Browsers
AJAX XMLHttpRequest
AJAX Server
AJAX Server Script
AJAX Advanced
AJAX Suggest
AJAX Source
AJAX Database
AJAX XML File
AJAX ResponseXML
AJAX Examples
AJAX Examples

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# AJAX ResponseXML Example

While responseText returns the HTTP response as a string, responseXML returns the response as XML.

The ResponseXML property returns an XML document object, which can be examined and parsed using W3C DOM node tree methods and properties.

## AJAX ResponseXML Example

In the following AJAX example we will demonstrate how a web page can fetch information from a database using AJAX technology. The selected data from the database will this time be converted to an XML document, and then we will use the DOM to extract the values to be displayed.

## Select a Name in the Box Below

Select a Customer:

## AJAX Example Explained

The example above contains an HTML form, several <span> elements to hold the returned data, and a link to a JavaScript:

    <html>
    <head>
    <script src="selectcustomer_xml.js"></script>
    </head>
    <body>

    <form action="">
    Select a Customer:
    <select name="customers" onchange="showCustomer(this.value)">
    <option value="ALFKI">Alfreds Futterkiste</option>
    <option value="NORTS ">North/South</option>
    <option value="WOLZA">Wolski Zajazd</option>
    </select>
    </form>

    <b><span id="companyname"></span></b><br />
    <span id="contactname"></span><br />
    <span id="address"></span>
    <span id="city"></span><br/>
    <span id="country"></span>

    </body>
    </html>

The example above contains an HTML form with a drop down box called "customers".

When the user selects a customer in the dropdown box, a function called "showCustomer()" is executed. The execution of the function is triggered by the "onchange" event. In other words: Each time the user change the value in the drop down box, the function showCustomer() is called.

The JavaScript code is listed below.

## The AJAX JavaScript

This is the JavaScript code stored in the file "selectcustomer_xml.js":

    var xmlHttp

    function showCustomer(str)
    {
    xmlHttp=GetXmlHttpObject();
    if (xmlHttp==null)
      {
      alert ("Your browser does not support AJAX!");
      return;
      }
    var url="getcustomer_xml.asp";
    url=url+"?q="+str;
    url=url+"&sid="+Math.random();
    xmlHttp.onreadystatechange=stateChanged;
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
    }

    function stateChanged()
    {
    if (xmlHttp.readyState==4)
    {
    var xmlDoc=xmlHttp.responseXML.documentElement;
    document.getElementById("companyname").innerHTML=
    xmlDoc.getElementsByTagName("compname")[0].childNodes[0].nodeValue;
    document.getElementById("contactname").innerHTML=
    xmlDoc.getElementsByTagName("contname")[0].childNodes[0].nodeValue;
    document.getElementById("address").innerHTML=
    xmlDoc.getElementsByTagName("address")[0].childNodes[0].nodeValue;
    document.getElementById("city").innerHTML=
    xmlDoc.getElementsByTagName("city")[0].childNodes[0].nodeValue;
    document.getElementById("country").innerHTML=
    xmlDoc.getElementsByTagName("country")[0].childNodes[0].nodeValue;
    }
    }

    function GetXmlHttpObject()
    {
    var xmlHttp=null;
    try
      {
      // Firefox, Opera 8.0+, Safari
      xmlHttp=new XMLHttpRequest();
      }
    catch (e)
      {
      // Internet Explorer
      try
        {
        xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        }
      catch (e)
        {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
      }
    return xmlHttp;
    }

The showCustomer() and GetXmlHttpObject() functions above are the same as in previous chapters. The stateChanged() function is also used earlier in this tutorial, however; this time we return the result as an XML document (with responseXML) and uses the DOM to extract the values we want to be displayed.

## The AJAX Server Page

The server page called by the JavaScript, is a simple ASP file called "getcustomer_xml.asp".

The page is written in VBScript for an Internet Information Server (IIS). It could easily be rewritten in PHP, or some other server language. Look at a corresponding example in PHP.

The code runs an SQL query against a database and returns the result as an XML document:

    <%
    response.expires=-1
    response.contenttype="text/xml"

    sql="SELECT * FROM CUSTOMERS "
    sql=sql & " WHERE CUSTOMERID='" & request.querystring("q") & "'"

    on error resume next
    set conn=Server.CreateObject("ADODB.Connection")
    conn.Provider="Microsoft.Jet.OLEDB.4.0"
    conn.Open(Server.Mappath("/db/northwind.mdb"))
    set rs=Server.CreateObject("ADODB.recordset")
    rs.Open sql, conn

    if err <> 0 then
    response.write(err.description)
    set rs=nothing
    set conn=nothing
    else
    response.write("<?xml version='1.0' encoding='ISO-8859-1'?>")
    response.write("<company>")
    response.write("<compname>" &rs.fields("companyname")& "</compname>")
    response.write("<contname>" &rs.fields("contactname")& "</contname>")
    response.write("<address>" &rs.fields("address")& "</address>")
    response.write("<city>" &rs.fields("city")& "</city>")
    response.write("<country>" &rs.fields("country")& "</country>")
    response.write("</company>")
    end if
    on error goto 0
    %>

Notice the second line in the ASP code above: response.contenttype="text/xml". The ContentType property sets the HTTP content type for the response object. The default value for this property is "text/html". This time we want the content type to be XML.

Then we select data from the database, and builds an XML document with the data.

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