Developing Mobile…Force.com and Sencha-Part 2, Step 8: Adjusting the Model and Adding a Data Proxy - Controller Init stub

controller.init

init: function () {
    this.callParent(arguments);
    console.log("init");

    //Listen for exceptions observed by the proxy so we can report them and clean up.
    //20121016 Fixed for bug on improper object references
    Ext.getStore('Leads').getProxy().addListener('exception', function (proxy, response, operation, options) {
        // only certain kinds of errors seem to have useful information returned from the server
        if (response) {
            if (response.errorMessage) {
                Ext.Msg.alert('Error', response.errorMessage);
            } else {
                Ext.Msg.alert('Error', operation.config.action + ' failed: ' + response.errorMessage);
            }
        } else {
            Ext.Msg.alert('Error', operation.config.action + ' failed for an unknown reason: proxy = ' + proxy);
        }
    });

},

Fixed for bug on improper object references, now properly displays error messages passed back from the Apex controller.