In LWC communication how to pass the multiple values from parent component to child component through component JavaScript Method in salesforce lightning web component

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Hey guys, today in this post we are going to learn about In LWC communication how to pass the multiple values from parent component to child component through component JavaScript Method in Salesforce lightning web component.

Files we used in this post example

parentCmpLwc.html	Lightning Web Component HTML	The Templae HTML file for used to write HTML element for user interface.
parentCmpLwc.js	Lightning Web Component JavaScript	It is holding click functionality and geting the input value from child component.
parentCmpLwc.js-meta.xml	XML Meta File	It is used for where this lightning web component you want to exposed.
childCmpLwc.html	Lightning Web Component HTML	It is child HTML file and calling on parentCmpLwc.html.
childCmpLwc.js	Lightning Web Component JavaScript	It is holding @api public property and passing the value into parent componet.
lwcApp.app	Lightning Application	It is used for call the component to preview on browser..

Live Demo

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Create Parent Component

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

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

parentCmpLwc.html [Lightning Web Component HTML]

  <template>
    <lightning-card>
        
        <h3 slot="title">
            <lightning-icon icon-name="utility:connected_apps" size="small"></lightning-icon> Pass the multiple values from parent component to child component in LWC       
        </h3>           
         <div class="slds slds-p-horizontal--medium">
            <lightning-icon icon-name="utility:down" size="x-small"> </lightning-icon> <span style="color:#ff0000; display:inline-block; margin-left:5px;">Parent Component</span>    
            <div class="slds-grid slds-wrap">
                <div class="slds-col slds-size_6-of-12 slds-p-horizontal--medium slds-m-bottom--small"><lightning-input type="text" label="User Name" class="userName"></lightning-input></div>
                <div class="slds-col slds-size_6-of-12 slds-p-horizontal--medium slds-m-bottom--small"><lightning-input type="text" label="Email" class="userEmail"></lightning-input></div>
                <div class="slds-col slds-size_6-of-12 slds-p-horizontal--medium slds-m-bottom--small"><lightning-input type="text" label="Phone" class="userPhone"></lightning-input></div>
                <div class="slds-col slds-size_6-of-12 slds-p-horizontal--medium slds-m-bottom--small"><lightning-input type="text" label="Address" class="userAddress"></lightning-input></div>
                <div class="slds-col slds-size_12-of-12 slds-p-horizontal--medium slds-text-align--center" >
                    <lightning-button label="Action Method" variant="brand" size="small" onclick={handleAction}></lightning-button>
                </div>
            </div>

            <lightning-icon icon-name="utility:down" size="x-small"></lightning-icon> <span style="color:#ff0000; display:inline-block; margin-left:5px;">Child Component</span>    
             <c-child-cmp-lwc></c-child-cmp-lwc>
        </div>

         </lightning-card>
</template>

<lightning-card>

<lightning-icon icon-name="utility:connected_apps" size="small"></lightning-icon> Pass the multiple values from parent component to child component in LWC

</h3>

<lightning-icon icon-name="utility:down" size="x-small"> </lightning-icon> <span style="color:#ff0000; display:inline-block; margin-left:5px;">Parent Component</span>

<lightning-button label="Action Method" variant="brand" size="small" onclick={handleAction}></lightning-button>

</div>

<lightning-icon icon-name="utility:down" size="x-small"></lightning-icon> <span style="color:#ff0000; display:inline-block; margin-left:5px;">Child Component</span>

<c-child-cmp-lwc></c-child-cmp-lwc>

</div>

</lightning-card>

</template>

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

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

parentCmpLwc.js [LWC JavaScript File]

  import { api, LightningElement } from 'lwc';


export default class ParentCmpLwc extends LightningElement {
    @api username;
    @api useremail;
    @api userphone;
    @api useraddress;

    handleAction(){
      this.username = this.template.querySelector('.userName').value;
      this.useremail= this.template.querySelector('.userEmail').value;
      this.userphone= this.template.querySelector('.userPhone').value;
      this.useraddress= this.template.querySelector('.userAddress').value;
      
      var fullValueStr = {
         getUserName:this.username,
         getUserEmail:this.useremail, 
         geUserPhone:this.userphone, 
         getUserAddress:this.useraddress
      };
      window.console.log(JSON.stringify('fullValueStr' + fullValueStr));
      this.template.querySelector("c-child-cmp-lwc").displayChildValueAction(fullValueStr);
     
      this.username = this.template.querySelector('.userName').value='';
      this.useremail= this.template.querySelector('.userEmail').value='';
      this.userphone= this.template.querySelector('.userPhone').value='';
      this.useraddress= this.template.querySelector('.userAddress').value='';

    }
}

import { api, LightningElement } from 'lwc';

export default class ParentCmpLwc extends LightningElement {

@api username;

@api useremail;

@api userphone;

@api useraddress;

handleAction(){

this.username = this.template.querySelector('.userName').value;

this.useremail= this.template.querySelector('.userEmail').value;

this.userphone= this.template.querySelector('.userPhone').value;

this.useraddress= this.template.querySelector('.userAddress').value;

var fullValueStr = {

getUserName:this.username,

getUserEmail:this.useremail,

geUserPhone:this.userphone,

getUserAddress:this.useraddress

};

window.console.log(JSON.stringify('fullValueStr' + fullValueStr));

this.template.querySelector("c-child-cmp-lwc").displayChildValueAction(fullValueStr);

this.username = this.template.querySelector('.userName').value='';

this.useremail= this.template.querySelector('.userEmail').value='';

this.userphone= this.template.querySelector('.userPhone').value='';

this.useraddress= this.template.querySelector('.userAddress').value='';

}

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

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

parentCmpLwc.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>
      </targets>
</LightningComponentBundle>

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

<target>lightning__AppPage</target>

<target>lightning__RecordPage</target>

<target>lightning__HomePage</target>

</targets>

</LightningComponentBundle>

Create Child Component

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

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

childCmpLwc.html [Lightning Web Component HTML]

  <template>
    <lightning-card>    
        <table class="slds-table slds-table_cell-buffer slds-table_bordered slds-table_col-bordered" border="1" cellspacing="0" cellpadding="0" bordercolor="#ccc" style="border-collapse:collapse;">
            <thead>
                <tr>
                    <th>User Name</th>
                    <th>Email</th>
                    <th>Phone</th>
                    <th>Address</th>                    
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>{userNameVal}</td>
                    <td>{userEmailVal}</td>
                    <td>{userPhoneVal}</td>
                    <td>{userAddressVal}</td>                   
                </tr>
            </tbody>
        </table>       
    </lightning-card>
</template>

<lightning-card>

<thead>

<tr>

<th>Email</th>

<th>Phone</th>

<th>Address</th>

</tr>

</thead>

<tbody>

<tr>

<td>{userNameVal}</td>

<td>{userEmailVal}</td>

<td>{userPhoneVal}</td>

<td>{userAddressVal}</td>

</tr>

</tbody>

</table>

</lightning-card>

</template>

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

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

childCmpLwc.js [LWC JavaScript File]

  import { api, LightningElement } from 'lwc';

export default class ChildCmpLwc extends LightningElement {
    @api userNameVal;
    @api userEmailVal;
    @api userPhoneVal;
    @api userAddressVal;


    @api
    displayChildValueAction(namestr){
       this.userNameVal = namestr.getUserName;
       this.userEmailVal = namestr.getUserEmail;
       this.userPhoneVal = namestr.geUserPhone;
       this.userAddressVal = namestr.getUserAddress;
    }

}

import { api, LightningElement } from 'lwc';

export default class ChildCmpLwc extends LightningElement {

@api userNameVal;

@api userEmailVal;

@api userPhoneVal;

@api userAddressVal;

@api

displayChildValueAction(namestr){

this.userNameVal = namestr.getUserName;

this.userEmailVal = namestr.getUserEmail;

this.userPhoneVal = namestr.geUserPhone;

this.userAddressVal = namestr.getUserAddress;

}

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

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

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

  <?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>48.0</apiVersion>
    <isExposed>false</isExposed>
</LightningComponentBundle>

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

<isExposed>false</isExposed>

</LightningComponentBundle>

Create Lightning Application

Step 7:- Create Lightning Application : slwcApp.app

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

lwcApp.app [Component Application File]

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

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

<c:parentCmpLwc/>

</aura:application>

Further post that would you like to learn in LWC

Files we used in this post example

Create Parent Component

parentCmpLwc.html [Lightning Web Component HTML]

parentCmpLwc.js [LWC JavaScript File]

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

Create Child Component

childCmpLwc.html [Lightning Web Component HTML]

childCmpLwc.js [LWC JavaScript File]

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

Create Lightning Application

lwcApp.app [Component Application File]

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