proper method to get selected record from extjs grid - extjs

Question

I need to get selected record from extjs grid but get
Uncaught TypeError: grid.getSelectionModel is not a function
got this view
Ext.define( 'App.view.Measuries', {
extend: 'Ext.window.Window',
alias : 'widget.measuries',
title: 'Мероприятия',
autoShow: false,
modal: true,
resizable: true,
initComponent: function()
{
this.items = [
{
xtype: 'grid',
alias: 'measuries_grid',
bodyPadding: 8,
defaults: { width: 1000, labelAlign: 'top' },
columns:[
{ header: 'п/п', width: 60, dataIndex: 'm_number', menuDisabled: true, sortable: false},
{ header: 'Мероприятие', width: 340, dataIndex: 'm_text', menuDisabled: true, sortable: false},
{ header: 'Плановая дата выполнения', width: 146, dataIndex: 'date_plan', menuDisabled: true, sortable: false, xtype: 'datecolumn', format:'d.m.Y', align: 'center'},
{ header: 'Фактическая дата выполнения', width: 146, dataIndex: 'date_done', menuDisabled: true, sortable: false, xtype: 'datecolumn', format:'d.m.Y', align: 'center'},
{ header: 'Выполнено', width: 95, dataIndex: 'isdone', menuDisabled: true, sortable: false, align: 'center',
renderer: function ( v )
{
return '<img src="img/' + v.toString().toLowerCase() + '.png">';
}},
{ header: 'Отказ', width: 95, dataIndex: 'faultid', menuDisabled: true, sortable: false},
],
store : 'Measuries'
}
];
and this controller (well a part of it)
editMeasuries: function()
{
var grid = this.getMeasuries();
console.log(grid);
var rec = grid.getSelectionModel().getLastSelected();
/*var sel = grid.getSelectionModel();
var rec = sel.getLastSelected();*/
if ( rec )
{
var view = Ext.widget( 'measuries-edit' );
view.down( 'form' ).loadRecord( rec );
}
},
it seems trouble with "this.getMeasuries()" part. My "alias : 'widget.measuries'" go to 'Ext.window.Window' and getSelecionModel() requires a grid. I've tried to set alias to grid item inside 'Ext.window.Window' but got error too.
How i can change my controller part to get things right?
Sorry for possible mistakes, my english is weak so as extjs.

Answer 1

Set an itemId for the grid and use getComponent on your window to get your grid:
this.items = [
{
itemId: 'myGrid', // add this line
xtype: 'grid',
...
Then in your 'editMeasures` function do like this:
editMeasuries: function()
{
var myWindow = this.getMeasuries();
var myGrid = myWindow.getComponent('myGrid');
...

Answer 2

Instead of using itemId you might want to use references, which is the faster way of handling items in the viewController.
(I am taking the code from #Peter Koltai)
this.items = [{
reference: 'myGrid', // add this line
xtype: 'grid',
...
Then in your 'editMeasures` function do like this (you do not need myWindow, it's just there to demonstrate a different approach):
editMeasuries: function()
{
let myWindow = this.getView(),
myGrid = this.lookup('myGrid');
...