How to Communicate Between Parent to Child and Passing the Value from Parent Component to Child component in Lightning Web Component — LWC | How to pass the multiple values from parent component to child component in lwc

December 13, 2021December 5, 2020 by Author of w3web.net

Post Views: 4,154

Hey guys, today in this post we are going to learn about How to Communicate Between Parent to Child and Passing the Value from Parent Component to Child component in Lightning Web Component — LWC.

Files we used in this post example:-

lwcParent.html.html	Lightning Web Component HTML	Template HTML file for used to write HTML element for user interface.
lwcParent.js.js	Lightning Web Component JavaScript	It is holding click functionality and geting the input value.
lwcParent.js-meta.xml	XML Meta File	It is used for where this lightning web component should be exposed.
lwcChild.html.html	Lightning Web Component HTML	It is child HTML file and calling on lwcParent.html.
lwcChild.js.js	Lightning Web Component JavaScript	It is holding @api public property and calling into parent componet.
lwcChild.js-meta.xml	XML Meta File	It is used for where this lightning web component should be exposed.

Live Demo

Don’t forget to check out:- In LWC communication how to pass the multiple values from parent component to child component through component JavaScript Method in salesforce lightning web component Click Here For More Information

Other related post that would you like to learn in LWC

Step 1:- Create Lightning Web Component : lwcParent.html

SFDX:Lightning Web Component >> New >> lwcParent.html

lwcParent.html [Lightning Web Component HTML]

  <template>
    <lightning-card title="How to pass value from parent to child component in lwc" icon-name="custom:custom9">
    
    <div class="slds-wrap slds-grid">
        <div class="slds-col slds-size_6-of-12 slds-p-horizontal--small slds-m-bottom--medium">
            <lightning-input name="firstName" label="First Name" value={firstNameVal} onchange={handleChange}></lightning-input>
        </div>         
        <div class="slds-col slds-size_6-of-12 slds-p-horizontal--small slds-m-bottom--medium">
            <lightning-input name="lastName" label="Last Name" value={lastNameVal} onchange={handleChange}></lightning-input>
        </div>         

        <div class="slds-col slds-size_12-of-12 slds-p-horizontal--small slds-m-bottom--medium">
            <c-lwc-child child-attr-val={fullNameVal}></c-lwc-child>
        </div>

        <div class="slds-col slds-size_12-of-12 slds-p-horizontal--small slds-m-bottom--medium slds-text-align--center">
            <lightning-button variant="brand" size="small" label="Add Value" onclick={addValueAction}></lightning-button>
        </div>    

   </div>

<br/><br/>
   <!--Start RelatedTopics Section-->
<div style="border:1px #ddd solid; padding:10px; background:#eee; margin:40px 0;">
            
            <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>
 
            <br/><br/>
            <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 →</span> </strong></p>
            <div style="display:block; overflow:hidden;"> 
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                </div>
               <div style="clear:both;"></div> 
               <br/>
                <div class="youtubeIcon">
                    <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>
                </div>
    </div>
 
</div>
 
  <!--End RelatedTopics Section-->

</lightning-card>
</template>

<lightning-card title="How to pass value from parent to child component in lwc" icon-name="custom:custom9">

<lightning-input name="firstName" label="First Name" value={firstNameVal} onchange={handleChange}></lightning-input>

</div>

<lightning-input name="lastName" label="Last Name" value={lastNameVal} onchange={handleChange}></lightning-input>

</div>

<c-lwc-child child-attr-val={fullNameVal}></c-lwc-child>

</div>

<lightning-button variant="brand" size="small" label="Add Value" onclick={addValueAction}></lightning-button>

</div>

<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>

<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>

<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>

<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>

<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>

<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>

</ul>

</div>

<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>

<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>

<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>

<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>

<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>

</ul>

</div>

<br/>

<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>

</div>

</lightning-card>

</template>

Step 2:- Create Lightning Web Component : lwcParent.js

SFDX:Lightning Web Component >> New >> lwcParent.js

lwcParent.js [LWC JavaScript File]

  import { LightningElement, track } from 'lwc';

export default class LwcParent extends LightningElement {
        @track firstNameVal;
        @track lastNameVal;
        @track fullNameVal;

    handleChange(event){
        if(event.target.name=='firstName'){
            this.firstNameVal = event.target.value;
            //window.console.log('firstNameVal# ' + this.firstNameVal );
        }
        if(event.target.name=='lastName'){
            this.lastNameVal = event.target.value;
            //window.console.log('lastNameVal# ' + this.lastNameVal );
        }

    }

        addValueAction(event){
            this.fullNameVal = this.firstNameVal + ' ' + this.lastNameVal;
           // window.console.log('fullNameVal# ' + this.fullNameVal );
        }

 }

import { LightningElement, track } from 'lwc';

export default class LwcParent extends LightningElement {

@track firstNameVal;

@track lastNameVal;

@track fullNameVal;

handleChange(event){

if(event.target.name=='firstName'){

this.firstNameVal = event.target.value;

//window.console.log('firstNameVal# ' + this.firstNameVal );

}

if(event.target.name=='lastName'){

this.lastNameVal = event.target.value;

//window.console.log('lastNameVal# ' + this.lastNameVal );

}

addValueAction(event){

this.fullNameVal = this.firstNameVal + ' ' + this.lastNameVal;

// window.console.log('fullNameVal# ' + this.fullNameVal );

}

Step 3:- Create Lightning Web Component : lwcParent.js-meta.xml

SFDX:Lightning Web Component >> New >> lwcParent.js-meta.xml

lwcParent.js-meta.xml [LWC Meta Data XML]

  <?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>45.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__AppPage</target>
        <target>lightning__RecordPage</target>
        <target>lightning__HomePage</target>
        <target>lightning__Tab</target>
      </targets>
</LightningComponentBundle>

<?xml version="1.0" encoding="UTF-8"?>

<target>lightning__AppPage</target>

<target>lightning__RecordPage</target>

<target>lightning__HomePage</target>

<target>lightning__Tab</target>

</targets>

</LightningComponentBundle>

Step 4:- Create Lightning Web Component : lwcChild.html

SFDX:Lightning Web Component >> New >> lwcChild.html

lwcChild.html [Lightning Web Component HTML]

   <template>    
    <b style="color:brown;">Full name is:- </b>  {childAttrVal}
</template>

<b style="color:brown;">Full name is:- </b> {childAttrVal}

</template>

Step 5:- Create Lightning Web Component : lwcChild.js

SFDX:Lightning Web Component >> New >> lwcChild.js

lwcChild.js [LWC JavaScript File]

  import { api, LightningElement } from 'lwc';

  export default class LwcChild extends LightningElement {
    @api childAttrVal;
  }

import { api, LightningElement } from 'lwc';

export default class LwcChild extends LightningElement {

@api childAttrVal;

}

Step 6:- Create Lightning Web Component : lwcChild.js-meta.xml

SFDX:Lightning Web Component >> New >> lwcChild.js-meta.xml

lwcChild.js-meta.xml [LWC Meta Data XML]

  <?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>45.0</apiVersion>
    <isExposed>true</isExposed>
</LightningComponentBundle>

<?xml version="1.0" encoding="UTF-8"?>

</LightningComponentBundle>

TechW3web:- To know more, Use this Link

in lwc — w3web.net” width=”671″ height=”227″ class=”alignnone size-medium wp-image-3655″ />

Further post that would you like to learn in LWC

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Author of w3web.net

Hi, This is Vijay 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

14 thoughts on “How to Communicate Between Parent to Child and Passing the Value from Parent Component to Child component in Lightning Web Component — LWC | How to pass the multiple values from parent component to child component in lwc”

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Files we used in this post example:-

lwcParent.html [Lightning Web Component HTML]

lwcParent.js [LWC JavaScript File]

lwcParent.js-meta.xml [LWC Meta Data XML]

lwcChild.html [Lightning Web Component HTML]

lwcChild.js [LWC JavaScript File]

lwcChild.js-meta.xml [LWC Meta Data XML]

Related Topics | You May Also Like

Author of w3web.net

14 thoughts on “How to Communicate Between Parent to Child and Passing the Value from Parent Component to Child component in Lightning Web Component — LWC | How to pass the multiple values from parent component to child component in lwc”

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