Parent Component :-

<aura:component implements="force:appHostable" >
    <aura:handler name="beerSearchEvent" event="c:SearchEvent" action="{!c.handleBeerSearchEvent}"/>
        <c:HeaderComponent tagLine="Beer Explorer" message="For all fun to be..."/>

Parent Component Controller :-

    handleBeerSearchEvent : function(component, event, helper) 
        var searchParam = event.getParam('searchText');

Child Component :-

<aura:component >
    <aura:registerEvent name="beerSearchEvent" type="c:SearchEvent"/>
    <aura:attribute name="issearching" type="Boolean" default="false"/>
    <div class="slds-p-around_x-small">
        <lightning:input aura:id="beerSearchButton" 
                         name="Beer Search" 
                         label="Your favourite beer just a search away..."
                         placeholder="Search Your Favourite Beer Here..."

Child Component Controller :-

    doSearch: function(component,event,helper)
        var componentEvent = component.getEvent('beerSearchEvent');
        var beerSearchInput = component.find('beerSearchButton').get('v.value');
        componentEvent.setParam({searchText : beerSearchInput});

Event :-

<aura:event type="component" description="Event template">
    <aura:attribute name="searchText" type="string"/>

When I am running this in an Application, the alert is returning me Undefined but as per the expectation it should alert whatever I am entering in the Lightning : input Search. What i am doing wrong??? Please help me out!!!


SecureEvent#setParam expects two parameters, a string and an object:

componentEvent.setParam('searchText', beerSearchInput);

If you want to use object notation, use the plural version, SecureEvent#setParams:

componentEvent.setParams({searchText: beerSearchInput});
| improve this answer | |
  • This worked!!! thanks a lot... Been learning lightning for a while and these are small things that I need to learn and remember... – SFDC Alex Aug 9 at 15:18
  • 1
    @SFDCAlex I always use setParams myself, even if there's only one, that way I don't have to worry about the other syntax. – sfdcfox Aug 9 at 16:12

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