Sencha Touch 2 set label in Controller

Question

I'm new to the MVC structure with Sencha Touch 2.

In my view, I have a label as follows:

{ xtype: 'label', itemId: 'title', html: 'title' }

In my controller, how do I set the value of this label?

Currently my controller (working off a tutorial sample):

Ext.define("NotesApp.controller.Notes", {

extend: "Ext.app.Controller",
config: {
    refs: {
        // We're going to lookup our views by xtype.
        noteView: "noteview",
        noteEditorView: "noteeditorview",
        notesList: "#notesList"
    },
    control: {
        noteView: {
            // The commands fired by the notes list container.
            noteNextCommand: "onNoteNextCommand",
            noteAnswerCommand: "onNoteAnswerCommand"
        },
        noteEditorView: {
            // The commands fired by the note editor.
            saveNoteCommand: "onSaveNoteCommand",
            deleteNoteCommand: "onDeleteNoteCommand",
            backToHomeCommand: "onBackToHomeCommand"
        }

    }
},

onNoteNextCommand: function () {
       var noteView = this.getNoteView();           
       console.log("loaded view"); 
       //set label here                  
},
// Base Class functions.
launch: function () {
    this.callParent(arguments);
    var notesStore = Ext.getStore("Notes");
    notesStore.load();
    console.log("launch");
},
init: function () {
    this.callParent(arguments);
    console.log("init");
} });

The full View code:

Ext.define("NotesApp.view.Note", { extend: "Ext.Container", alias: "widget.noteview",

config: {
    layout: {
        type: 'fit'
    },
    items: [
            {
            xtype: "toolbar",
            title: "Random Question",
            docked: "top",
            items: [
                    { xtype: 'spacer' },
                    {
                        xtype: "button",
                        text: 'List',
                        ui: 'action',
                        itemId: "list"
                    }
                    ]
            },
            {                
                    xtype: "label",
                    html: 'question',                        
                    itemId: "question"                        
            },
            {                
                    xtype: "label",
                    html: 'answer',                        
                    itemId: "answer"                        
            }
            ],
    listeners: [{
                delegate: "#list",
                event: "tap",
                fn: "onListTap"
                }, 
                {
                delegate: "#question",
                event: "tap",
                fn: "onQuestionTap"
                },
                {
                delegate: "#answer",
                event: "tap",
                fn: "onAnswerTap"
                }]
},    
onListTap: function () {
    console.log("list");
    this.fireEvent("showList", this);
},
onQuestionTap: function () {
    console.log("noteAnswer");
    this.fireEvent('noteAnswer', this);
},
onAnswerTap: function () {
    console.log("noteNext");
    this.fireEvent('noteNext', this);
} });

Answer 1

Give your label some id property value

{                
  xtype: "label",
  html: 'answer',                        
  id: "answerLabel"                        
}

and then write the following code in your controller.

.....
..... // Controller code ..
refs: {
     answerLabel: '#answerLabel',
    },
control: {
     answerLabel: {
       tap: 'answerLabelFn'
     }
}
.....
.....
answerLabelFn : function() {
      // Your Label tap handler code...
}

Answer 2

You need to add a reference to your label in your controller :

config: {
  refs: {
    yourlabel : #YOUR_LABEL_ID'
  }
  …
}

and then in your controller you can access the label by calling this.getYourlabel();

So, in order to change the title, you need to do (wherever you want in your controller)

this.getYourlabel().setHtml('Label');

Hope this helps