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I was reading following document (https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/ui_events.htm), but there is nowhere specified how to find out, which UI component triggers the event...we can only specify handler for it.

Scenario: I have lot of ui:inputNumber components in table and I need an event to send its value on change to another component.

Is it possible to find out in handler, which UI components triggered the "change" event from ui:inputNumber?

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lets say you have multiple ui:inputNumber

<aura:component >
    <aura:attribute name="whichButton" type="String" />

    <p>You clicked: {!v.whichButton}</p>

    <ui:inputNumber aura:id="button1" label="Click me" change="{!c.nameThatButton}"/>
    <ui:inputNumber aura:id="button2" label="Click me too" change="{!c.nameThatButton}"/>
</aura:component>

In js you can get aura:id by 

({
    nameThatButton : function(cmp, event, helper) {
        var whichOne = event.getSource().getLocalId();
        console.log(whichOne);
        cmp.set("v.whichButton", whichOne);
    }
})

refernce : https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/js_cb_which_button_pressed.htm

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event.getSource().get("v.name") will solve your problem.

For more details, check the link below:

http://hellosnl.blogspot.in/2017/05/which-button-was-pressed.html

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    Jul 17, 2017 at 17:05

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