ExtJS grab JSON result

Question

I'm generating JSON response from PHP witch looks like this:

{ done:'1', options: [{ message:'Example message'},{message:'This is the 2nd example message'}]}

I want to grab these results using ExtJS. This is what I have so far:

Ext.Ajax.request({
    loadMask: true,
    url: 'myfile.php',
    params: {id: "1"}
});

What do I have to write next to get the json results like this:

var mymessages = jsonData.options;

And mymessages should contain Example message and This is the 2nd example message.

Thank you.

Answer 1

The straightforward approach:

Ext.Ajax.request({
  loadMask: true,
  url: 'myfile.php',
  params: {id: "1"},
  success: function(resp) {
    // resp is the XmlHttpRequest object
    var options = Ext.decode(resp.responseText).options;

    Ext.each(options, function(op) {
      alert(op.message);
    }
  }
});

Or you could do it in a more Ext-ish way using Store:

var messages = new Ext.data.JsonStore({
  url: 'myfile.php',
  root: 'options',
  fields: [
    {name: 'text', mapping: 'message'}
  ],
  listeners: {
    load: messagesLoaded
  }
});
messages.load({params: {id: "1"}});

// and when loaded, you can take advantage of
// all the possibilities provided by Store
function messagesLoaded(messages) {
  messages.each(function(msg){
    alert(msg.get("text"));
  });
}

One more example to address the last comment:

var messages = [{title: "1"},{title: "2"},{title: "3"}];

var titles = msg;
Ext.each(messages, function(msg){
  titles.push(msg.title);
});
alert(titles.join(", "));

Although I would prefer doing it with a Array.map (which isn't provided by Ext):

var text = messages.map(function(msg){
  return msg.title;
}).join(", ");
alert(text);

Answer 2

Use the success and failure properties:

Ext.Ajax.request({
    loadMask: true,
    url: 'myfile.php',
    params: {id: "1"},
    success: function(response, callOptions) {
       // Use the response
    },
    failure: function(response, callOptions) {
       // Use the response
    }
});

See the Ext API docs for more details

Answer 3

check this sample fiddle which is for Ext JS 4. http://jsfiddle.net/mrigess/e3StR/

Ext 4 onward utilizes Ext.JSON.encode() and Ext.JSON.decode() ; while Ext 3 uses Ext.util.JSON.encode() and Ext.util.JSON.decode()