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Thread: Problem while taking data from Ajax

  1. #1
    Join Date
    Jul 2009
    Location
    Turkey
    Posts
    10

    Exclamation Problem while taking data from Ajax

    Hello to everyone,

    I'm starter at Ajax and I've a problem while taking data(xml) from ajax. I used a javascript function named "ajaxFunction" to take data from DB with a parameter. I tested I succesfully take data from DB but can't send back to script.

    I followed the instructions from w3schools. (http://www.w3schools.com/Ajax/ajax_responsexml.asp)

    Here's my code, I'll be soo happy if someone helps me..

    Thanx in advance,
    Talha

    Code:
    function ajaxFunction(str)
    	{
    		var xmlhttp;
    		if (window.XMLHttpRequest)
    		  {
    		  // code for IE7+, Firefox, Chrome, Opera, Safari
    		  xmlhttp=new XMLHttpRequest();
    		  }
    		else if (window.ActiveXObject)
    		  {
    		  // code for IE6, IE5
    		  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    		  }
    		else
    		  {
    		  alert("Your browser does not support XMLHTTP!");
    		  }
    		// xmlHttpRequest objesi olusturuldu
    		var url = "callback.jsp" + "?q=" + str;
    		
    		xmlhttp.onreadystatechange=stateChanged;
    		xmlhttp.open("GET",url,true);
    		xmlhttp.send(null);
    		//xmlhttp.onreadystatechange=function()
    		//{
    		function stateChanged()
    		{
    		if(xmlhttp.readyState==4)
    		  {
    		  	// Now I'll set ExtJS textfields values with the data I took from DB	
    		  	var xmlDoc=xmlhttp.responseXML.documentElement;
    		  	
    		  	Ext.getCmp("noText").setValue(xmlDoc.getElementsByTagName("numara")[0].childNodes[0].nodeValue);
    		  	Ext.getCmp("cinsText").setValue(xmlDoc.getElementsByTagName("cinsiyet")[0].childNodes[0].nodeValue);
    		  	Ext.getCmp("emailText").setValue(xmlDoc.getElementsByTagName("email")[0].childNodes[0].nodeValue);
    		  }
    		}
    	}
    Server-side: (jsp)
    Code:
    <%
    		String ad = request.getParameter("q");
    		System.out.println("callback.jsp calisti, gelen parametre: " + ad);
    		int numara=0;
    		String cinsiyet="default", email="default";
    		try{
    			Class.forName("com.mysql.jdbc.Driver").newInstance();
    			Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/ogrdb","root", "");
    			Statement st = con.createStatement();
    			String sql = "select * from ogr where AdSoyad=\'" + ad + "\'";
    			ResultSet rs = st.executeQuery(sql);
    			while(rs.next()) {
    				numara = rs.getInt("Numara");
    				cinsiyet = rs.getString("Cinsiyet");
    				email = rs.getString("Email");
    			}
    			System.out.println("Kisi Bilgileri\n-----\n" + numara + " - " + cinsiyet + " - " + email); 
    			response.setContentType("text/xml");  
    			response.setHeader("Cache-Control", "no-cache");  
    			response.getWriter().write("<?xml version='1.0' encoding='ISO-8859-1'?>");
    			response.getWriter().write("<ogr>");
    			response.getWriter().write("<numara>" + numara + "</numara>");
    			response.getWriter().write("<cinsiyet>" + cinsiyet + "</cinsiyet>");
    			response.getWriter().write("<email>" + email + "</email>");
    			response.getWriter().write("</ogr>");
    		} catch(Exception e) {
    			e.printStackTrace();
    		}
    	%>

  2. #2
    Join Date
    May 2003
    Location
    Between Baltimore and DC
    Posts
    3,579
    Why are you not using Ext's Ajax functionality?

    http://extjs.com/deploy/dev/docs/?class=Ext.Ajax

    Eric
    Tech Author [Ajax In Action, JavaScript: Visual Blueprint] | twitter | linkedin | http://www.pascarello.com

  3. #3
    Join Date
    Jul 2009
    Location
    Turkey
    Posts
    10
    thanx A1ien51, but my problem isn't Ajax connection problem.. But still I changed my connection as u said.. My problem is that I can't take back the data from Ajax to script..

    Code:
    Ext.Ajax.request({
      url: 'callback.jsp' + "?q=" + secim ,
      method: 'GET',
      success: function(result, request) {
    	// *** Here, how can I take data(xml) ???
         }
           });
    *** I tried the code as I wrote above; but it failed..

    Waiting ur helps..
    Thanx,
    Talha

  4. #4
    Join Date
    May 2003
    Location
    Between Baltimore and DC
    Posts
    3,579
    take back means what, you mean you can not read the data?

    Your error would be?

    Eric
    Tech Author [Ajax In Action, JavaScript: Visual Blueprint] | twitter | linkedin | http://www.pascarello.com

  5. #5
    Join Date
    Jul 2009
    Location
    Turkey
    Posts
    10
    OK dear Eric thanx a lot..

    I found the right syntax to send data to script.. I used Ext's "result.responseXML" class & it worked..

    Thanx a lot again for ur care..
    Talha

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