How to get the data from the window to the main screen

On the success of some Ajax call I am getting opening a window and the response I attach with the window. Here is my code.

success: function (response) {
    var data = Ext.decode(response.data);
    var window = Ext.widget('win');
    window.data = data;
    window.show();
},

Now I am doing some manipulation and all the manuplitaed data are available in window object. After saving I am closing the window. On Parent when I am trying to acesss like this I am not getting any value. How to deal with this.

someFunction : function(){
    var window = Ext.widget('win');
        window.data ; // Fail (No data available).
}

Window object in success() and in someFunction() are not same as Ext.widget will create a separate instance in both the functions. so data wont be persisted. To persist the data you can either use a config or viewModel.

I have created a sample code as per your scenarios to persist the data on window close using configs which acts kind of global to that specific view and its controller.

Ext.application({
    name : 'Fiddle',

    launch : function() {
        Ext.create("Ext.form.Panel",{
            renderTo: Ext.getBody(),
            config: {
                win: Ext.widget('window'), //if we store window, on close we loose it
                data: "" //it will persist, so this can be used
            },
            items: [
                {
                    xtype: 'button',
                    text: 'call',
                    handler: function(){
                        var me = this;
                        Ext.Ajax.request({
                         url: 'data1.json',

                            success: function(response, opts) {
                                var data = Ext.decode(response.responseText);
                                var window = me.up().config.win;
                                me.up().config.data = data;
                                window.data = data;
                                window.show();
                            },

                            failure: function(response, opts) {
                              console.log('server-side failure with status code ' + response.status);
                            }
                        });
                    }
                }, {
                    xtype: 'button',
                    text: 'Get Value',
                    handler: function(){
                       console.log(this.up().config.win.data);
                       console.log(this.up().config.data);
                    }
                }
            ]
        });
    }
});

Here the handler for first button will represent your ajax calls success and handler for second button represents your someFunction.

Here i kept two configs, win and data. win is a window object which will be destroyed on close so we cant use it. second is data which is a normal variable, which will be persisted unless respective view will be destroyed. so you can use 2nd config.

You can find working fiddle here.