Manually firing an event in Salesforce Lightning

Manually firing an event

In contrast, other component and application events are fired manually by event.fire() in client-side controllers.

For example, in the component, define a handler with name="change"

<ui:inputDate aura:id="dateField" label="Birthday" value="2014-01-30" displayDatePicker="true"/>

A component can have multiple <aura:handler name="change"> tags to detect changes to different attributes.

In the controller, define the action for the handler.

({

    itemsChange: function(cmp, evt) {

        var v = evt.getParam("value");

        if (v === cmp.get("v.items")) {

        //do something

        }

    }

})