9 Answers

• Can you post the entire code ?

• Thanks, here is the entire code, the xml on cloud is ok to get and read, but not on the local system.

  var data = [];

  var xhr = Ti.Network.createHTTPClient();

  if (Titanium.Network.online == true)

  {
  xhr.open("GET","http://www.cdn.com/data.xml");
  }

  else {

  var f=Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory,'data.xml');

  f.write(this.responseData); // the response you get

  var file=Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory, "data.xml"),

  if(file.exists()){

  Ti.API.info('in file ' + file.nativePath);

  var contents = file.read();

  Ti.API.info('contents = ' + contents.text);

  }

  }

• Kyle, I don't see Xhr onload to write responseData to the file, that's why it's not there. Also, you are rewriting the file when network is not there from responseData.

  // so here, if network is ok, you store data.xml in the system
  if (Titanium.Network.online == true)
  { 
  xhr.open("GET","http://www.cdn.com/data.xml"); 
  xhr.onload = function(){
    var f = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory,'data.xml');
  
  f.write(this.responseData);
  Ti.API.info('new file written');
  }
  } 
  else{
  //otherwise you read file from previously stored data
  var f=Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory, "data.xml"),
  
  if(f.exists()){
  
  Ti.API.info('in file ' + f.nativePath);
  
  var contents = f.read();
  
  Ti.API.info('contents = ' + contents.text);
  
  }
  
  else{
  Ti.API.info('boo boo, file not there');
  }
  }
  

• Daniel,
  Thanks a lot for ur help. I put your code to my file. Looks like it work, but it generates a new error, which is from another part of the file. Here is the entire code:
  if (Titanium.Network.online == true)
  {
  xhr.open("GET","http://www.cdn.com/data.xml");
  xhr.onload = function(){
  var f = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory,'data.xml');

  f.write(this.responseData);
  Ti.API.info('new file written');
  }
  }
  else{
  //otherwise you read file from previously stored data
  var f=Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory, "data.xml"),

  if(f.exists()){

  Ti.API.info('in file ' + f.nativePath);

  var contents = f.read();

  Ti.API.info('contents = ' + contents.text);

  }

  else{
  Ti.API.info('boo boo, file not there');
  }
  }

  xhr.onload = function()
  {
  try
  {

      var results = this.responseXML.documentElement;
      //var pubdate = results.evaluate("//feed/updated/text()");
      var pubdate = results.getElementsByTagName("updated").item(0).text;       
      //var title = results.getElementsByTagName("title");
      //var elist = results.getElementsByTagName("entry");
      var items = results.getElementsByTagName("entry");
      var x = 0;
      var oldsection = "none";
      if(!items){
          alertBox.show();
          }
      else {}
      ----------
  

  the error message is " Result of expression "this.responseXML' [null] is not an object."

  i donot have this error message until i put ur code in.
  thanks a lot

• try this to get a dom object:

  var xml= Titanium.XML.parseString(responseXml);

• Still get the error message: can not find variable: responseXML

  not sure what caused this.

  thanks

• You need to put the 2nd xhr onload on the first XHR onload block.

  xhr.onload = function(){
    var f = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory,'data.xml');
  f.write(this.responseData);
   var results = this.responseXML.documentElement;
      //var pubdate = results.evaluate("//feed/updated/text()");
      var pubdate = results.getElementsByTagName("updated").item(0).text;       
      //var title = results.getElementsByTagName("title");
  .............
  ..............
  }
  

  If you are trying to access remote xml on load, store it for both online and offline use. I would create function to parse the xml elemments so you don't have to repeat it twice.

  
  var f = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory,'data.xml');
  
  if (Titanium.Network.online == true) { 
   var xhr = Ti.Network.createHTTPClient();
         xhr.open("GET","http://www.cdn.com/data.xml"); 
         xhr.onload = function(){       
            f.write(this.responseData);
            getXMLdata(f); 
   } 
  else{ 
  if(f.exists()){
            getXMLdata(f); 
  }
  else{
      Titanium.UI.createAlertDialog({ 
                      title:'Network Error',
                      message: 'Your device is not online.'
                  }).show();
  }
  
  }
  
  function getXMLdata(file){
  if(file.exists()){
     var content = file.read();
     var results = Ti.XML.parseString(content.text);
     //access dom elements from results
   }
   else {
   alert('oops, file not there.')
   }
  

• Daniel, Thanks for your help. I tried to put the 2nd xhr onload on the first XHR onload block. Looks like it doesnot work. Here is the entire code of this file:

  var win = Titanium.UI.currentWindow;
  win.setBarColor('#165a99');
  win.showNavBar();

  // create table view data object

  var data = [];

  var xhr = Ti.Network.createHTTPClient();

  if (Titanium.Network.online == true)
  {
  xhr.open("GET","http://www.abcd.com/output3.xml");
  xhr.onload = function(){
  var f = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory,'output3.xml');

  f.write(this.responseData);
  Ti.API.info('new file written');
  };
  }
  else{
  //otherwise you read file from previously stored data

  var f=Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory, "output3.xml");

  if(f.exists()){

  Ti.API.info('in file ' + f.nativePath);

  var contents = f.read();

  Ti.API.info('contents = ' +
  contents.text);

  }

  else{
  Ti.API.info('boo boo, file not there');
  }
  }

  //activity indicator
  var actInd = Titanium.UI.createActivityIndicator({
  bottom:200,
  height:50,
  width:10,
  style:Titanium.UI.iPhone.ActivityIndicatorStyle.PLAIN
  });

  actInd.style = Titanium.UI.iPhone.ActivityIndicatorStyle.PLAIN;
  actInd.font = {fontFamily:'Helvetica Neue', fontSize:15,fontWeight:'bold'};
  actInd.color = 'white';
  actInd.message = 'Loading Table of Contents...';
  actInd.width = 210;
  actInd.show();
  

  win.add(actInd);

  xhr.onload = function()
  {
  try
  {
  var results = this.responseXML.documentElement;
  //var pubdate = results.evaluate("//feed/updated/text()");
  var pubdate = results.getElementsByTagName("updated").item(0).text;
  //var title = results.getElementsByTagName("title");
  //var elist = results.getElementsByTagName("entry");
  var items = results.getElementsByTagName("entry");
  var x = 0;
  var oldsection = "none";
  if(!items){
  alertBox.show();
  }
  else {}

      //build top-most heading for dates
      var headingRow = Ti.UI.createTableViewRow({
              height:30,
              className:"headingrow"
          });        
  
          var label = Ti.UI.createLabel({
                  text:'Issue date: ' + pubdate,
                  top:5,
                  height:'auto',
                  font:{fontSize:14},
                  left:5,
                  //color:'#fff',
                  right:5
              });
          headingRow.add(label);            
          data[x++] = headingRow;
  
      for (var c=0;c<items.length;c++)
      {
          var entry = items.item(c);
          var section = entry.getElementsByTagName("section").item(0).text;
          var title = entry.getElementsByTagName("title").item(0).text;
          var authors = entry.getElementsByTagName("authors").item(0).text;
          var category = entry.getElementsByTagName("category").item(0).text;
          var thumbnail = entry.getElementsByTagName("media:thumbnail").item(0).text;
  
                                  //var link = linklist.item(0).text;
  
          var row = Ti.UI.createTableViewRow({height:'auto',className:"myrow" }); 
  
  
          if(section != oldsection){
              row.header=section;
          }
  
          var individualRow = Ti.UI.createView({ //this sets the title/summary etc into its own window, so the image can be seperate.
              height:'auto',
              layout:'vertical',
              top:5,
              bottom:5,
              //minRowHeight:90,
              right:10
              });
  
  
          var rowcategory = Ti.UI.createLabel({
              text:category,
              left:72,
              height:15,
              font:{fontSize:12},
              right:5
          });
  
          var rowtitle = Ti.UI.createLabel({
              text:title,
              left:72,
              height:50,
              font:{fontSize:12,fontWeight:'bold'},
              right:5
          });
  
  
  
          var img = Ti.UI.createImageView({
              url:thumbnail,
              top:5,
              //bottom:5, //this causes problems with centering and stuff
              height:60,
              width:60,
              left:5,
              borderColor:'#000'
          });
  
          //row.add(rowtitle);
          //row.add(img);
          //for just the title, uncomment above, and delete the below row setup
          individualRow.add(rowcategory);
          individualRow.add(rowtitle);
          row.add(individualRow);
          row.add(img);           
  
  
  
          row.link = entry.getElementsByTagName("link").item(0).text;
          row.article = entry.getElementsByTagName("content").item(0).text;
          row.articledate = entry.getElementsByTagName("published").item(0).text;
          row.articletitle = entry.getElementsByTagName("title").item(0).text;
          row.vol = results.getElementsByTagName("vol").item(0).text;
          row.fpage = entry.getElementsByTagName("fpage").item(0).text;
          row.articleauthors = authors;
          row.image = thumbnail;
  
          data[x++] = row;
          oldsection = section;
  
  
      }
  
      var tableview = Titanium.UI.createTableView({
          data:data,
          className:"Thetableview"    
          });
  
  
      //once everything is loaded, then hide the activity notifier       
      actInd.hide();
  
  
      Titanium.UI.currentWindow.add(tableview);
      tableview.addEventListener('click',function(e)      
      //what happens when an article gets clicked
      {
  
          if (Ti.Platform.name == 'android') {
              options.navBarHidden = true;
          }
          var articleWindow = Titanium.UI.createWindow({
  
                  backgroundColor:'#165a99',
                  //title:'Latest News',
                  barColor:'#165a99'
  
          });
  
  
  
          var webView = Titanium.UI.createWebView({
  
              top:0,
  
              html:"<html><body><table><tr><td valign=\"top\"><img src=\""+e.row.image+"\" /></td><td valign=\"top\"><span style=\"color:#7777777;font-size:10px\">"+e.row.articledate+" - Volume "+e.row.vol+", Page "+e.row.fpage+"</span><h3 style=\"margin-top:2px\">"+e.row.articletitle+"</h3></td></tr><tr><td colspan=\"2\"> <span style=\"color:#666666\">"+e.row.articleauthors+"</span></td></tr></table>"+e.row.article+"<p></p><hr />View the full text <a href=\""+e.row.link +"\">here</a></body></html>"
          });
  
  
  
          var emailButton = Titanium.UI.createButton({
              title:'E-mail this',
              backgroundColor:'#165a99'
          });
  
          articleWindow.rightNavButton = emailButton;
          articleWindow.add(webView);
  
          Titanium.UI.currentTab.open(articleWindow,{animate:false});
  
  
          closeButton.addEventListener('click', function()
          {
  
              Titanium.UI.currentTab.close(articleWindow,{animate:false});
          });
  
          emailButton.addEventListener('click', function()
          {
              var emailDialog = Titanium.UI.createEmailDialog();
              emailDialog.setSubject('Article on Science Online');
              emailDialog.setMessageBody('From Science Online:  \n\n'+e.row.articletitle+'\n\n'+e.row.link + '\n\n Get Science Magazine on your iPhone for free by visiting http://itunes.com/apps/sciencemag');
              emailDialog.setBarColor('#d70000');
              //emailDialog.open(descriptionWindow,{animated:true});
              emailDialog.open();
          });
  
  
  
      });
  }
  catch(E)
  {
      alert(E);
  }
  

  };
  xhr.send();

• Here's the question for you, what are you trying to accomplish?