change the background color of panels in extjs

Question

In my project, I am trying to change the background color of all the panels inside a container. The code which I am trying is as follows:

container --> panel (don't change) --> panel (Change)

---

//Generated dynamically using for loop.
listeners: {
   'render': function(panel) {
        panel.body.on('click', function() {
                //here change the background color of all the panels inside the container>panel. 
        });
    }
}

What should I write to change the background color of the only panels which are present inside the parent panels of a main container?

I tried:

Ext.each('panel',function(){this.body.setStyle('background','white')}),

But the above approach is giving me the following error:

Uncaught TypeError: Cannot call method 'setStyle' of undefined

EDIT:

Here, I am looking for a method of extjs which quite do the same work as jQuery's children().

$('#containerID').children('panel').children('panel').css(change background color);

Answer 1

Based on your requirements you will always have a sum of 9 components you are looking at -1 the you start from. The shortest way is to use the each() method of the MixedCollection (at runtime all items are within a MixedCollection)

'render': function(panel) {
    panel.body.on('click', function() {
         panel.items.each(function(p){ p.body.setStyle('background','white'); }, this)
    },this);
}

This may not be the variant with the best performance but knowing your requirement from the last question I can say that this is the easiest. And in addition it will be easy to maintain. And read the article about delegates that I posted in the comments of the last question!

I hope there is now typo, cause it is untested

Update

Well, you are looking for the ownerCt property here (at least that is the easiest way). But there are some mightier navigation methods up() / down() both can be feeded with a ComponentQuery string. Leave the up() arguments empty will return the immediate owner/activater (basically the same as ownerCt).

Following a working example:

var childItems = [], items = [];
for (i = 0; i < 9; ++i) {
    childItems.push({
        xtype: 'container',
        width: 50,
        height: 50,
        html: i + '',
        style: {borderColor:'#000000', borderStyle:'solid', borderWidth:'1px'},
        listeners: {
            'afterrender': function(panel) {
                panel.el.on('click', function(e,t) {
                    panel.el.on('click', function(e,t) {
                    panel.el.setStyle('background','red');
                    panel.ownerCt.items.each(function(p){ if(panel.el.id != p.id) p.el.setStyle('background','white'); })
                });
             }
        }
    });
}
for (i = 0; i < 9; ++i) {
    items.push({
        xtype: 'container',
        layout: {
            type: 'table',
            columns: 3
        },
        style: {borderColor:'#000000', borderStyle:'solid', borderWidth:'1px'},
        items: childItems
    });
}
Ext.create('Ext.container.Container', {
    layout: {
        type: 'table',
        // The total column count must be specified here
        columns: 3
    },
    renderTo: Ext.getBody(),    
    style: {borderColor:'#000000', borderStyle:'solid', borderWidth:'1px', margin: '30px'},
    items: items
});

Update 2

To reset all try this (untested)

'afterrender': function(panel) {
          panel.el.on('click', function(e,t) {
              panel.el.setStyle('background','red');
              panel.ownerCt.ownerCt.items.each(function(op){ 
                   op.items.each(function(p){ 
                       if(panel.el.id != p.id) 
                          p.el.setStyle('background','white'); 
                   })
              }, this)
          });
 }

JSFiddle