Sending parameter to js

[sencha.user]

Hi,

I have a varialble in Controller like,

Ext.define('MyApp.controller.MyController', {
    extend: 'Ext.app.Controller',
    onFieldButtonClick: function(button, e, options) {
    var groupChecked = Ext.getCmp('groupgrid').getSelectionModel().getSelection();
        var arrayValues = [];
        Ext.each(groupChecked, function(rec, index) {
            arrayValues.push(rec.get('colName'));
        });
    var MyGrid = Ext.ComponentQuery.query('MyGrid')[0];
                    MyGrid.getStore().reload({
                        params:{
                            singleton: true,
                            param1: [arrayValues]
                        }
                    });
...

I want to use this arrayValues in another js in another location, I am doing,

groupField: MyApp.controller.MyController.param1

But I am not getting the value there, how should I do to get the selected value?