How does work application and component event in Salesforce lightning component| 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.

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Step 1:- Create Lightning Application : eventApp1.app

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

eventApp1.app [Component Application File]

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  1.   <aura:application extends="force:slds">
  2. 	<c:eventRegisterCmp1/>
  3. </aura:application>

Step 2:- Create Lightning Component : eventRegisterCmp1.cmp

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

eventRegisterCmp1.cmp [Lightning Component File]

  1.    <aura:component >
  2.     <aura:registerEvent name="repCheck" type="c:repCheckboxEvent"/>
  3.     <div class="slds slds-p-around--medium">  
  4.         <button class="slds-button slds-button--brand"  onclick="{!c.checkVal}">
  5.             checkValue
  6.         </button> 
  7.         <br/><br/>
  8.         <c:eventHandlerCmp1/>
  9.  
  10. <br/> <br/>
  11.    <!--Start RelatedTopics Section-->
  12. <div style="border:1px #ddd solid; padding:10px; background:#eee; margin:40px 0;">
  13.  
  14.             <p data-aura-rendered-by="435:0"><img src="https://www.w3web.net/wp-content/uploads/2021/05/thumbsUpLike.png" width="25" height="25" style="vertical-align:top; margin-right:10px;" data-aura-rendered-by="436:0"><strong data-aura-rendered-by="437:0"><span style="font-size:16px; font-style:italic; display:inline-block; margin-right:5px;">Don't forget to check out:-</span><a href="https://www.w3web.net/" target="_blank" rel="noopener noreferrer" style="text-decoration:none;" data-aura-rendered-by="440:0">An easy way to learn step-by-step online free Salesforce tutorial, To know more Click  <span style="color:#ff8000; font-size:18px;" data-aura-rendered-by="442:0">Here..</span></a></strong></p>
  15.  
  16.             <br/><br/>
  17.             <p data-aura-rendered-by="435:0"><img src="https://www.w3web.net/wp-content/uploads/2021/07/tickMarkIcon.png" width="25" height="25" style="vertical-align:top; margin-right:10px;" data-aura-rendered-by="436:0"><strong data-aura-rendered-by="437:0"><span style="font-size:17px; font-style:italic; display:inline-block; margin-right:5px; color:rgb(255 128 0);">You May Also Like โ†’</span> </strong></p>
  18.             <div style="display:block; overflow:hidden;"> 
  19.                 <div style="width: 50%; float:left; display:inline-block">
  20.                     <ul style="list-style-type: square; font-size: 16px; margin: 0 0 0 54px; padding: 0;"> 
  21.                         <li><a href="https://www.w3web.net/lwc-get-set-lightning-checkbox-value/" target="_blank" rel="noopener noreferrer">How to get selected checkbox value in lwc</a></li>
  22.                         <li><a href="https://www.w3web.net/display-account-related-contacts-in-lwc/" target="_blank" rel="noopener noreferrer">how to display account related contacts based on AccountId in lwc</a></li>
  23.                         <li><a href="https://www.w3web.net/create-lightning-datatable-row-actions-in-lwc/" target="_blank" rel="noopener noreferrer">how to create lightning datatable row actions in lwc</a></li>
  24.                         <li><a href="https://www.w3web.net/if-and-else-condition-in-lwc/" target="_blank" rel="noopener noreferrer">how to use if and else condition in lwc</a></li>
  25.                         <li><a href="https://www.w3web.net/get-selected-radio-button-value-and-checked-default-in-lwc/" target="_blank" rel="noopener noreferrer">how to display selected radio button value in lwc</a></li>
  26.                     </ul>
  27.             </div>
  28.  
  29.             <div style="width: 50%; float:left; display:inline-block">
  30.                     <ul style="list-style-type: square; font-size: 16px; margin: 0 0 0 54px; padding: 0;"> 
  31.                         <li><a href="https://www.w3web.net/display-account-related-contacts-lwc/" target="_blank" rel="noopener noreferrer">display account related contacts based on account name in lwc</a></li>
  32.                         <li><a href="https://www.w3web.net/create-lightning-datatable-row-actions-in-lwc/" target="_blank" rel="noopener noreferrer">how to insert a record of account Using apex class in LWC</a></li>
  33.                         <li><a href="https://www.w3web.net/fetch-picklist-values-dynamic-in-lwc/" target="_blank" rel="noopener noreferrer">how to get picklist values dynamically in lwc</a></li>
  34.                         <li><a href="https://www.w3web.net/edit-save-and-remove-rows-dynamically-in-lightning-component/" target="_blank" rel="noopener noreferrer">how to edit/save row dynamically in lightning component</a></li>
  35.                         <li><a href="https://www.w3web.net/update-parent-object-from-child/" target="_blank" rel="noopener noreferrer">update parent field from child using apex trigger</a></li>
  36.                     </ul>
  37.                 </div>
  38.                <div style="clear:both;"></div> 
  39.                <br/>
  40.                 <div class="youtubeIcon">
  41.                     <a href="https://www.youtube.com/channel/UCW62gTen2zniILj9xE6LmOg" target="_blank" rel="noopener noreferrer"><img src="https://www.w3web.net/wp-content/uploads/2021/11/youtubeIcon.png" width="25" height="25" style="vertical-align:top; margin-right:10px;"/> <strong>TechW3web:-</strong> To know more, Use this <span style="color: #ff8000; font-weight: bold;">Link</span> </a>
  42.                 </div>
  43.     </div>
  44.  
  45. </div>
  46.  
  47.   <!--End RelatedTopics Section-->
  48.  
  49.     </div>   
  50. </aura:component>

Step 3:- Create Lightning Component : eventRegisterCmp1Controller.js

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

eventRegisterCmp1Controller.js [JavaScript Controller]

  1.   ({
  2. 	checkVal : function(component, event, helper) {
  3. 		var repCheck = $A.get("e.c:repCheckboxEvent");        
  4.  
  5.         repCheck.setParams({
  6.             "selfCheckValue":true
  7.         });
  8.  
  9.         repCheck.fire();
  10. 	}
  11.   })

Step 4:- Create Lightning Component : eventHandlerCmp1.cmp

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

eventHandlerCmp1.cmp [Lightning Component File]

  1.   <aura:component>
  2.     <aura:handler event="c:repCheckboxEvent"  action="{!c.repCheckEnable}"/>	
  3.     <aura:attribute name="selfChildDeal" type="Boolean"/>
  4.     <div class="slds slda-p-around--medium">   
  5.         <div class="slds-form-element__control"> 
  6.             <label class="slds-checkbox"> 
  7.                 <ui:inputCheckbox aura:id="repCheckId" value="{!v.selfChildDeal}" />
  8.                 <span class="slds-checkbox--faux"></span>
  9.                 <span class="slds-form-element__label slds-m-left--x-small" style="font-size: 0.75rem;">
  10.                     Self Representative
  11.                 </span>
  12.             </label>
  13.         </div>
  14.         <br/>
  15.     </div>      
  16. </aura:component>

Step 5:- Create Lightning Component : eventHandlerCmp1Controller.js

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

eventHandlerCmp1Controller.js [JavaScript Controller]

  1.   ({
  2. 	repCheckEnable : function(component, event, helper) {
  3.          var selfCheckValue1 = event.getParam("selfCheckValue");       
  4.         component.set("v.selfChildDeal", selfCheckValue1);
  5.         //alert('selfCheckValue ' + selfCheckValue);
  6.  
  7. 	}
  8. })

Step 6:- Lightning Event : repCheckboxEvent.evt

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

repCheckboxEvent.evt [Lightning Component File]

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

 

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FAQ (Frequently Asked Questions)

What is an application event in lightning?

Create a custom application event using the tag in a . evt resource. Events can contain attributes that can be set before the event is fired and read when the event is handled.

What are events in Lightning component?

A component event is an event that is fired by a lightning component. A component event can either be handled by the component itself or it can be handled by any other component which is present in the hierarchy that receives the event.

What is event in application?

An event is any identifiable occurrence that has significance for system hardware or software. As such, events include both user-generated actions like mouse clicks and keystrokes and system-generated events such as program loading.

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Hi, This is Vijay Kumar behind the admin and founder of w3web.net. I am a senior software developer and working in MNC company from more than 8 years. I am great fan of technology, configuration, customization & development. Apart of this, I love to write about Blogging in spare time, Working on Mobile & Web application development, Salesforce lightning, Salesforce LWC and Salesforce Integration development in full time. [Read full bio] | | The Sitemap where you can find all published post on w3web.net

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