ExtJS: How to extend an Ext.Panel with a BorderLayout? - extjs

Question

I am trying to display a panel with a BorderLayout. The panel being displayed is an instance of an Ext.Panel subclass. I had the panel displaying perfectly before attempting to add the layout, but with the layout added it doesn't show at all, without throwing any errors or giving any useful feedback whatsoever. Using exactly the same attributes, but not subclassing, the panel also works fine.
To demonstrate, with code directly from the ExtJS BorderLayout API, this works:
var win = new Ext.Panel({
renderTo: document.body,
width: 700,
height: 500,
title: 'Border Layout',
layout: 'border',
items: [{
title: 'South Region is resizable',
region: 'south', // position for region
height: 100,
split: true, // enable resizing
minSize: 75, // defaults to 50
maxSize: 150,
margins: '0 5 5 5'
},{
// xtype: 'panel' implied by default
title: 'West Region is collapsible',
region:'west',
margins: '5 0 0 5',
width: 200,
collapsible: true, // make collapsible
cmargins: '5 5 0 5', // adjust top margin when collapsed
id: 'west-region-container',
layout: 'fit',
unstyled: true
},{
title: 'Center Region',
region: 'center', // center region is required, no width/height specified
xtype: 'container',
layout: 'fit',
margins: '5 5 0 0'
}]
});
and this does not:
BasePanel = Ext.extend(Ext.Panel, {
renderTo: document.body,
width: 700,
height: 500,
title: 'Border Layout',
layout: 'border',
items: [{
title: 'South Region is resizable',
region: 'south', // position for region
height: 100,
split: true, // enable resizing
minSize: 75, // defaults to 50
maxSize: 150,
margins: '0 5 5 5'
},{
// xtype: 'panel' implied by default
title: 'West Region is collapsible',
region:'west',
margins: '5 0 0 5',
width: 200,
collapsible: true, // make collapsible
cmargins: '5 5 0 5', // adjust top margin when collapsed
id: 'west-region-container',
layout: 'fit',
unstyled: true
},{
title: 'Center Region',
region: 'center', // center region is required, no width/height specified
xtype: 'container',
layout: 'fit',
margins: '5 5 0 0'
}]
});
var win = new BasePanel();
Am I missing something obvious here?
Thanks for any help.

Answer 1

You need to create the actual control, then extend it:
var BasePanel = function (config) {
Ext.apply(config,{items: [{
title: 'South Region is resizable',
region: 'south', // position for region
height: 100,
split: true, // enable resizing
minSize: 75, // defaults to 50
maxSize: 150,
margins: '0 5 5 5'
}, {
// xtype: 'panel' implied by default
title: 'West Region is collapsible',
region: 'west',
margins: '5 0 0 5',
width: 200,
collapsible: true, // make collapsible
cmargins: '5 5 0 5', // adjust top margin when collapsed
id: 'west-region-container',
layout: 'fit',
unstyled: true
}, {
title: 'Center Region',
region: 'center', // center region is required, no width/height specified
xtype: 'container',
layout: 'fit',
margins: '5 5 0 0'
}]});
//call the base constructor
BasePanel.superclass.constructor.call(this, config);
}
Ext.extend(BasePanel, Ext.Panel, {
width: 700,
height: 500,
title: 'Border Layout',
layout: 'border',
});
var win = new BasePanel({renderTo:document.body});