Custom loading gif

http://stackoverflow.com/questions/15286775/loadmask-image-extjs

HTML

<link rel="stylesheet" href="http://cdn.sencha.io/ext-4.1.1-gpl/resources/css/ext-all.css">
<script src="http://cdn.sencha.io/ext-4.1.1-gpl/ext-all.js"></script>

CSS

.x-mask-msg .custom-loader {
    background-image: url(http://loadinggif.com/images/image-selection/1.gif);
}

JavaScript

Ext.create('Ext.data.Store', {
    storeId:'simpsonsStore',
    fields:['name', 'email', 'phone'],
    data:{'items':[
        { 'name': 'Lisa',  "email":"[email protected]",  "phone":"555-111-1224"  },
        { 'name': 'Bart',  "email":"[email protected]",  "phone":"555-222-1234" },
        { 'name': 'Homer', "email":"[email protected]",  "phone":"555-222-1244"  },
        { 'name': 'Marge', "email":"[email protected]", "phone":"555-222-1254"  }
    ]},
    proxy: {
        type: 'memory',
        reader: {
            type: 'json',
            root: 'items'
        }
    }
});

var panel = Ext.create('Ext.grid.Panel', {
    title: 'Simpsons',

    store: Ext.data.StoreManager.lookup('simpsonsStore'),
    columns: [
        { text: 'Name',  dataIndex: 'name' },
        { text: 'Email', dataIndex: 'email', flex: 1 },
        { text: 'Phone', dataIndex: 'phone' }
    ],
    height: 200,
    width: 400,
    renderTo: Ext.getBody()
});

panel.view.loadMask.show();