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Editorial Team
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Asked: 2026-05-16T06:43:31+00:00

I’ve created a panel bundled with an Ext.Template. This panel is contained in another

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I’ve created a panel bundled with an Ext.Template. This panel is contained in another panel that starts its life collapsed.

id:             'myPanel',
title:          'My Title',
layout:         'border',
collapsible:    true,
collapsed:      true,
hideCollapseTool:true,
bodyBorder:     false,
height:         300,
bodyStyle:      'background:#F9F9F9;',
items: [{
    id:         'myDisplayPanel',
    bodyStyle:  'background:transparent;',
    width:      300,
    border:     false,
    margins:    '5 5 5 5',
    region:     'west',
    tpl:        new Ext.Template([
                    'some template'
                ])
},
{
    id:         'myForm',
    xtype:      'form',
    bodyStyle:  'background:transparent;',
    border:     false,
    margins:    '5 5 5 5',
    region:     'center',
[...]

This template-panel is supposed to be updated as the result of a row select in a neighbouring grid. But I get an error the first time I call .update(data); on the myDisplayPanel, as it contains no body element.

myGridSelectionModel: new Ext.grid.RowSelectionModel({
    singleselect: true,
    listeners: {
        rowselect: function(sm,rowIdx,r) {
            Ext.getCmp('myDisplayPanel').update(r.data);
            Ext.getCmp('myPanel').expand(true);
        }
    }
}),

The call to myDisplayPanel.update() causes an error when Ext tries to call the template.overwrite function with myDisplayPanel.body as the first param.

function(b,a,c){b=Ext.getDom(b);b.innerHTML=this.applyTemplate(a);

Is it possible somehow to force Ext to generate a body element for this hidden panel before it is beeing shown? I’ve tried to expand the element prior to updating it, but this has now effect…

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1 Answer

  1. Editorial Team

    Collapsed panels (and hidden containers in general) by default do not layout their children until they first become visible. You can override this behavior by setting forceLayout: true on the collapsed container. As the name suggests, this will force the container to perform its layout whether it is visible or not. Note that in your case this would be myPanel that would need this configuration, not myDisplayPanel.

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