ExtJS 4使用Ext.grid.plugin.RowEditing根据另一个值更改单元格值

Question

I have TreeGrid with multiple columns and I use RowEditing plugin to save data. I want to change value of "Total" dynamically when "Price" changes. I made the following, but it doesnt work. when I look at "Total" object, I see thet value is changed, but a cant see this in RowEditing plugin at the time of editing and before update.

{
    text: 'price',        
    dataIndex: 'price',
    editor: {
    xtype: 'textfield',
            listeners: {
                change: function (field, newValue, oldValue, eOpts) {
                    var selectedModel = MyTree.getSelectionModel().getSelection()[0];
                    selectedModel.set('total', 'Total sum is' + field.value);
                }
            }
    }
}, 
{ 
    text: 'total',        
    dataIndex: 'total',
    editor: {
        xtype: 'textfield'
    }
}

Answer 1

I found the solution!

var total = MyTree.getPlugin('roweditor').editor.down('textfield[name=total]');
total.setValue('Total sum is' + field.value);`