Question

Can you tell me how to attach headerclick or headerdblclick event to Ext.grid.GridPanel?

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Solution

You can either use the listeners config (at config time) or the .on() method (with a grid reference).

{
    xtype: 'grid',
    listeners: {
        'headerclick': {
            fn: function(grid, col, e){
                // whatever
            },
            scope: this
         }
     }
 }

or

myGrid.on('headerclick', function(grid, col, e){
    // whatever
});
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