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

August 11, 2021December 5, 2020 by Author of w3web.net

Post Views: 2,750

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/>
    <p><img src="https://www.w3web.net/wp-content/uploads/2021/05/thumbsUpLike.png" width="25" height="25" style="vertical-align:top; margin-right:10px;"/> <strong> <span style="font-size:15px; font-style:italic; display:inline-block; margin-right:5px;">Don't forget to check out:-</span> <a href="https://www.w3web.net/" target="_blank" style="text-decoration:none;" rel="noopener noreferrer">An easy way to learn step-by-step online free tutorial, To know more Click  <span style="color:#ff8000; font-size:18px;">Here..</span></a></strong></p>

</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><img src="https://www.w3web.net/wp-content/uploads/2021/05/thumbsUpLike.png" width="25" height="25" style="vertical-align:top; margin-right:10px;"/> <strong> <span style="font-size:15px; font-style:italic; display:inline-block; margin-right:5px;">Don't forget to check out:-</span> <a href="https://www.w3web.net/" target="_blank" style="text-decoration:none;" rel="noopener noreferrer">An easy way to learn step-by-step online free tutorial, To know more Click <span style="color:#ff8000; font-size:18px;">Here..</span></a></strong></p>

</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″ />

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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.

11 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”

pinjara khubsurti kaa

December 8, 2020 at 1:00 pm

Thanks For Sharing The Amazing content. I Will also share with my friends. Great Content thanks a lot.
Antika Alanlar

December 12, 2020 at 11:30 am

Antikalarınız değerinde ve nakit olarak alınır.
Vikas

December 15, 2020 at 6:13 pm

Very Informative Article!
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July 2, 2021 at 4:56 pm

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July 7, 2021 at 9:34 am

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Clyde Brooks

July 7, 2021 at 7:05 pm

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Rupam sarmah

July 11, 2021 at 3:57 pm

Nice Post
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Fiona Xu

August 5, 2021 at 6:30 am

Great work, thanks

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

11 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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