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Ext JS 4 Grid State Management

ExtJS enables you allow your users to reorder grid columns using drag & drop. By combining this feature with Ext JS state management, you can let users customize the look of grids and preserve those settings on a going-forward basis. However, users occasionally make mistakes, so it’s helpful to also give them the option to restore the grid columns back to their initial defaults as illustrated by the following code snippet:
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Ext.application({
    name: 'Fiddle',
 
    launch: function() {
        // tooltips are good!
        Ext.QuickTips.init();
 
        // turn on state management - store state in cookies
        Ext.state.Manager.setProvider(Ext.create('Ext.state.CookieProvider'));
 
        var store = Ext.create('Ext.data.Store', {
            fields: ['first', 'last'],
            data: [{
                first: 'Steve',
                last: 'Drucker'
            }, {
                first: 'Dave',
                last: 'Gallerizzo'
            }, {
                first: 'Jason',
                last: 'Perry'
            }]
        });
 
 
        Ext.widget('grid', {
 
            renderTo: Ext.getBody(),
            store: store,
            title: 'Names',
            stateful: true,          // turn on state management for the grid
            stateId: 'gridexample',  // give the grid instance a unique state id
            width: 300,
            height: 200,
            columns: [{
                text: 'First',
                dataIndex: 'first',
                flex: 1
            }, {
                text: 'Last',
                dataIndex: 'last',
                flex: 1
            }],
            tools: [{
                type: 'gear',
                tooltip: 'Reset Grid Layout',
                handler: function(event, toolEl, owner, tool) {
                    Ext.Msg.confirm('Reset Grid Layout', 'Are you sure that you want to reset the grid layout?',
 
                    function(response) {
                        if (response == 'yes') {
                            var grid = tool.up('grid');
 
                            // clear the state management for the grid
                            Ext.state.Manager.clear(grid.stateId);
                             
                            // repaint the grid using the hardcoded defaults
                            grid.reconfigure(grid.getStore(), grid.initialConfig.columns);
                        }
                    });
                }
            }
 
            ]
 
        });
 
    }
});

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