A Simple Example of Application Event Handling Between two Custom Lightning Components in Salesforce

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Hey guys, today in this post we are going to learn about how to communicate between two custom component using application event.

Real time scenarios:- Create an event in Salesforce lightning, and Checked the Value of Checkbox from parent component to child component on click button in Lightning Component using Application event.

Files we used in this post example:-

eventApp1.app	Lightning Application	It is used for call the component to preview on browser.
eventRegisterCmp1.cmp	Lightning Component	It is a parent component and hold a click button.
eventRegisterCmp1Controller.js	JavaScript Controller File	It is used for click function for Checkbox Checked the Value.
eventHandlerCmp1.cmp	Lightning Component	It is a child component of eventRegisterCmp1.cmp, It is hold checkbox input.
eventHandlerCmp1Controller.js	JavaScript Controller File	It is fire automatically and get the value of event from parent component and set value of attribute.
repCheckboxEvent.evt	Lightning Event	Creat a application event, hold a boolean type attribute that default value is false.

Live Demo

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Step 1:- Create Lightning Application : eventApp1.app

From Developer Console >> File >> New >> Lightning Application

eventApp1.app [Component Application File]

  <aura:application extends="force:slds">
	<c:eventRegisterCmp1/>
</aura:application>

<aura:application extends="force:slds">

<c:eventRegisterCmp1/>

</aura:application>

Step 2:- Create Lightning Component : eventRegisterCmp1.cmp

From Developer Console >> File >> New >> Lightning Component

eventRegisterCmp1.cmp [Lightning Component File]

   <aura:component >
    <aura:registerEvent name="repCheck" type="c:repCheckboxEvent"/>
    <div class="slds slds-p-around--medium">  
        <button class="slds-button slds-button--brand"  onclick="{!c.checkVal}">
            checkValue
        </button> 
        <br/><br/>
        <c:eventHandlerCmp1/>
    </div>   
</aura:component>

<aura:component >

<aura:registerEvent name="repCheck" type="c:repCheckboxEvent"/>

checkValue

</button>

<c:eventHandlerCmp1/>

</div>

</aura:component>

Step 3:- Create Lightning Component : eventRegisterCmp1Controller.js

From Developer Console >> File >> New >> Lightning Component >> JavaScript Controller

eventRegisterCmp1Controller.js [JavaScript Controller]

  ({
	checkVal : function(component, event, helper) {
		var repCheck = $A.get("e.c:repCheckboxEvent");        
    
        repCheck.setParams({
            "selfCheckValue":true
        });
        
        repCheck.fire();
	}
  })

({

checkVal : function(component, event, helper) {

var repCheck = $A.get("e.c:repCheckboxEvent");

repCheck.setParams({

"selfCheckValue":true

});

repCheck.fire();

}

})

Step 4:- Create Lightning Component : eventHandlerCmp1.cmp

From Developer Console >> File >> New >> Lightning Component

eventHandlerCmp1.cmp [Lightning Component File]

  <aura:component>
    <aura:handler event="c:repCheckboxEvent"  action="{!c.repCheckEnable}"/>	
    <aura:attribute name="selfChildDeal" type="Boolean"/>
    <div class="slds slda-p-around--medium">   
        <div class="slds-form-element__control"> 
            <label class="slds-checkbox"> 
                <ui:inputCheckbox aura:id="repCheckId" value="{!v.selfChildDeal}" />
                <span class="slds-checkbox--faux"></span>
                <span class="slds-form-element__label slds-m-left--x-small" style="font-size: 0.75rem;">
                    Self Representative
                </span>
            </label>
        </div>
        <br/>
    </div>      
</aura:component>

<aura:component>

<aura:handler event="c:repCheckboxEvent" action="{!c.repCheckEnable}"/>

<aura:attribute name="selfChildDeal" type="Boolean"/>

<ui:inputCheckbox aura:id="repCheckId" value="{!v.selfChildDeal}" />

Self Representative

</span>

</label>

</div>

<br/>

</div>

</aura:component>

Step 5:- Create Lightning Component : eventHandlerCmp1Controller.js

From Developer Console >> File >> New >> Lightning Component >> JavaScript Controller

eventHandlerCmp1Controller.js [JavaScript Controller]

  ({
	repCheckEnable : function(component, event, helper) {
         var selfCheckValue1 = event.getParam("selfCheckValue");       
        component.set("v.selfChildDeal", selfCheckValue1);
        //alert('selfCheckValue ' + selfCheckValue);
		
	}
})

({

repCheckEnable : function(component, event, helper) {

var selfCheckValue1 = event.getParam("selfCheckValue");

component.set("v.selfChildDeal", selfCheckValue1);

//alert('selfCheckValue ' + selfCheckValue);

}

})

Step 6:- Lightning Event : repCheckboxEvent.evt

From Developer Console >> File >> New >> Lightning Event

repCheckboxEvent.evt [Lightning Component File]

   <aura:event type="Application" description="Event template" access="global">
    <aura:attribute name="selfCheckValue" type="Boolean" default="false"/>
</aura:event>

<aura:event type="Application" description="Event template" access="global">

<aura:attribute name="selfCheckValue" type="Boolean" default="false"/>

</aura:event>

Further post that would you like to learn

Files we used in this post example:-

eventApp1.app [Component Application File]

eventRegisterCmp1.cmp [Lightning Component File]

eventRegisterCmp1Controller.js [JavaScript Controller]

eventHandlerCmp1.cmp [Lightning Component File]

eventHandlerCmp1Controller.js [JavaScript Controller]

repCheckboxEvent.evt [Lightning Component File]

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