View Full Version : about 'this.data is undefined' error

2 May 2010, 11:28 PM

I tried to put RowExpander plugin in my layout.

This is the code. (CenterArea.js)

// shared reader
var reader = new Ext.data.ArrayReader({}, [
{name: 'company'},
{name: 'price', type: 'float'},
{name: 'change', type: 'float'},
{name: 'pctChange', type: 'float'},
{name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia'},
{name: 'industry'},
{name: 'desc'}

// row expander
var expander = new Ext.ux.grid.RowExpander({
tpl : new Ext.Template(
'<p><b>Company:</b> {company}</p><br>',
'<p><b>Summary:</b> {desc}</p>'

var grid1 = new Ext.grid.GridPanel({
store: new Ext.data.Store({
reader: reader,
data: Ext.grid.dummyData
cm: new Ext.grid.ColumnModel({
defaults: {
width: 20,
sortable: true
columns: [
{id:'company',header: "Company", width: 40, dataIndex: 'company'},
{header: "Price", renderer: Ext.util.Format.usMoney, dataIndex: 'price'},
{header: "Change", dataIndex: 'change'},
{header: "% Change", dataIndex: 'pctChange'},
{header: "Last Updated", renderer: Ext.util.Format.dateRenderer('m/d/Y'), dataIndex: 'lastChange'}
viewConfig: {
width: 600,
height: 300,
plugins: expander,
collapsible: true,
animCollapse: false,
title: 'Expander Rows, Collapse and Force Fit',
iconCls: 'icon-grid'

// Array data for the grids
Ext.grid.dummyData = [
['3m Co',71.72,0.02,0.03,'9/1 12:00am', 'Manufacturing'],
['Alcoa Inc',29.01,0.42,1.47,'9/1 12:00am', 'Manufacturing'],
['Altria Group Inc',83.81,0.28,0.34,'9/1 12:00am', 'Manufacturing'],
['American Express Company',52.55,0.01,0.02,'9/1 12:00am', 'Finance'],
['American International Group, Inc.',64.13,0.31,0.49,'9/1 12:00am', 'Services'],
['AT&T Inc.',31.61,-0.48,-1.54,'9/1 12:00am', 'Services'],
['Boeing Co.',75.43,0.53,0.71,'9/1 12:00am', 'Manufacturing'],
['Caterpillar Inc.',67.27,0.92,1.39,'9/1 12:00am', 'Services'],
['Citigroup, Inc.',49.37,0.02,0.04,'9/1 12:00am', 'Finance'],
['E.I. du Pont de Nemours and Company',40.48,0.51,1.28,'9/1 12:00am', 'Manufacturing'],
['Exxon Mobil Corp',68.1,-0.43,-0.64,'9/1 12:00am', 'Manufacturing'],
['General Electric Company',34.14,-0.08,-0.23,'9/1 12:00am', 'Manufacturing'],
['General Motors Corporation',30.27,1.09,3.74,'9/1 12:00am', 'Automotive'],
['Hewlett-Packard Co.',36.53,-0.03,-0.08,'9/1 12:00am', 'Computer'],
['Honeywell Intl Inc',38.77,0.05,0.13,'9/1 12:00am', 'Manufacturing'],
['Intel Corporation',19.88,0.31,1.58,'9/1 12:00am', 'Computer'],
['International Business Machines',81.41,0.44,0.54,'9/1 12:00am', 'Computer'],
['Johnson & Johnson',64.72,0.06,0.09,'9/1 12:00am', 'Medical'],
['JP Morgan & Chase & Co',45.73,0.07,0.15,'9/1 12:00am', 'Finance'],
['McDonald\'s Corporation',36.76,0.86,2.40,'9/1 12:00am', 'Food'],
['Merck & Co., Inc.',40.96,0.41,1.01,'9/1 12:00am', 'Medical'],
['Microsoft Corporation',25.84,0.14,0.54,'9/1 12:00am', 'Computer'],
['Pfizer Inc',27.96,0.4,1.45,'9/1 12:00am', 'Services', 'Medical'],
['The Coca-Cola Company',45.07,0.26,0.58,'9/1 12:00am', 'Food'],
['The Home Depot, Inc.',34.64,0.35,1.02,'9/1 12:00am', 'Retail'],
['The Procter & Gamble Company',61.91,0.01,0.02,'9/1 12:00am', 'Manufacturing'],
['United Technologies Corporation',63.26,0.55,0.88,'9/1 12:00am', 'Computer'],
['Verizon Communications',35.57,0.39,1.11,'9/1 12:00am', 'Services'],
['Wal-Mart Stores, Inc.',45.45,0.73,1.63,'9/1 12:00am', 'Retail'],
['Walt Disney Company (The) (Holding Company)',29.89,0.24,0.81,'9/1 12:00am', 'Services']

// add in some dummy descriptions
for(var i = 0; i < Ext.grid.dummyData.length; i++){
Ext.grid.dummyData[i].push('Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed metus nibh, sodales a, porta at, vulputate eget, dui. Pellentesque ut nisl. Maecenas tortor turpis, interdum non, sodales non, iaculis ac, lacus. Vestibulum auctor, tortor quis iaculis malesuada, libero lectus bibendum purus, sit amet tincidunt quam turpis vel lacus. In pellentesque nisl non sem. Suspendisse nunc sem, pretium eget, cursus a, fringilla vel, urna.<br/><br/>Aliquam commodo ullamcorper erat. Nullam vel justo in neque porttitor laoreet. Aenean lacus dui, consequat eu, adipiscing eget, nonummy non, nisi. Morbi nunc est, dignissim non, ornare sed, luctus eu, massa. Vivamus eget quam. Vivamus tincidunt diam nec urna. Curabitur velit.');

var nestedCenter = {
region: 'center',
title: 'device list',
autoScroll : true,
items: [grid1],
text:'view all',
iconCls: 'view_all',
pressed: true,
// tooltip: {title:'Open All',text:'Opens all item in tabs'},
handler: this.openAll,
text:'view group',
iconCls: 'view_group',
handler: this.openAll,
text:'view list',
iconCls: 'view_list',
handler: this.openAll,

var t1={ title: 'graph', html: '' };
var t2={ title: 'supplies', html: '' };
var t3={ title: 'device record', html: '' };

var n1 = new Ext.TabPanel({
region: 'west',
width: 700,
items: [t1, t2, t3],
activeItem: 0
var n2 = {
region: 'center',
title: 'Panel Info'

var nestedSouth = new Ext.Panel({
title : 'summary',
split: true,
collapsible: true,
height: 250,
region: 'south',
layout: 'border',
items: [n1, n2]

CenterArea = function(viewport){
this.viewport = viewport;
region: 'center',
title: false,
layout: 'border',
items: [nestedCenter, nestedSouth]
Ext.extend(CenterArea, Ext.Panel,{ });

This file is included like this in the file 'basicLayout.js'

BasicLayoutClass = function() {
return {
init : function() {
this.viewport = new Ext.Viewport( {
layout : 'border',
items : [
this.NorthPanel= new NorthArea(this),
this.SouthPanel= new SouthArea(this),
this.WestPanel= new WestArea(this),
this.CenterPanel= new CenterArea(this)

Ext.EventManager.onDocumentReady(BasicLayoutClass.init, BasicLayoutClass, true);

It's not working and show me an error 'this.data is undefined'.
How can I solve this problem?


3 May 2010, 12:19 AM
I moved Ext.grid.dummyData above the variable grid1.
It was solved.