As a variable
var sm_og = Ext.create('Ext.selection.CheckboxModel',{
checkOnly:true,
listeners:{
// prevent selection of records with invalid descriptions
beforeselect: function(selModel, record, index) {
if ((Ext.String.trim( record.get('x_field')) == '')) {
Ext.Msg.alert('Please complete the record! ','You cannot check these rows until you complete x field.');
return false;
}
}
}
});You can also add this to the class definition of the grid, by defining the "selModel" configuration setting.