Add Delete rows dynamically in Lightning Data Table in LWC Salesforce

Hello Guys, in this post we'll learn how to add delete rows dynamically in Lightning Data table in Lightning Web Components(LWC) in Salesforce with the proper Example.

Apex Class

public class AddDeleteRowLWCController {

    @AuraEnabled
    public static List getAccounts(){
        return [SELECT Id, Name, AccountNumber, Site FROM Account LIMIT 5];
    }
    @AuraEnabled
    public static Account addAccount(String account){
        Account accObj = (Account) System.JSON.deserialize(account, Account.class);
        insert accObj;
        return accObj;
    }
}

addDeleteRowLWC.html

<template>
    <lightning-card title="">
        <lightning-button variant="brand" label="Add Account" onclick={openAddAccountModal} ></lightning-button>
        <div class="slds-grid slds-no-flex slds-var-p-around_medium	">
            <div class="slds-col slds-size_12-of-12">
                <lightning-datatable key-field="Id"
                                    data={accountData}
                                    columns={columns}
                                    onrowaction={handleRowAction}
                                    hide-checkbox-column
                                    >
                </lightning-datatable>                            
            </div>
        </div>
    </lightning-card>

    <template if:true={isModalOpen}>
        <!-- Modal/Popup Box LWC starts here -->
        <section role="dialog" tabindex="-1" aria-labelledby="modal-heading-01" aria-modal="true" aria-describedby="modal-content-id-1" class="slds-modal slds-fade-in-open">
            <div class="slds-modal__container">
                <!-- Modal/Popup Box LWC header here -->
                <header class="slds-modal__header">
                    <button class="slds-button slds-button_icon slds-modal__close slds-button_icon-inverse" title="Close" onclick={closeModal}>
                        <lightning-icon icon-name="utility:close"
                            alternative-text="close"
                            variant="inverse"
                            size="small" ></lightning-icon>
                        <span class="slds-assistive-text">Close</span>
                    </button>
                    <h2 id="modal-heading-01" class="slds-text-heading_medium slds-hyphenate">Add Account</h2>
                </header>
                <!-- Modal/Popup Box LWC body starts here -->
                <div class="slds-modal__content slds-p-around_medium" id="modal-content-id-1">
                    <lightning-input name="accountName" type="text"  label="Name" value={accountName} onchange={handleChange}></lightning-input>                    
                    <lightning-input name="accountNumber" type="Integer" label="AccountNumber" value={accountNumber} onchange={handleChange}></lightning-input>                    
                    <lightning-input name="accountSite" type="text" label="Site" value={accountSite} onchange={handleChange}></lightning-input>                    

                </div>
                <!-- Modal/Popup Box LWC footer starts here -->
                <footer class="slds-modal__footer">
                    <button class="slds-button slds-button_neutral" onclick={closeModal} title="Cancel">Cancel</button>
                    <button class="slds-button slds-button_brand" onclick={addAccount} title="Add Account">Add Account</button>
                </footer>
            </div>
        </section>
        <div class="slds-backdrop slds-backdrop_open"></div>
    </template>

</template>

addDeleteRowLWC.js

import { LightningElement } from 'lwc';
import getAccounts from '@salesforce/apex/AddDeleteRowLWCController.getAccounts';
import addAccount from '@salesforce/apex/AddDeleteRowLWCController.addAccount';

export default class AddDeleteRowLWC extends LightningElement {
    columns = [
        {label: 'Name', fieldName: 'Name', type: 'text', sortable: true},
        {label: 'Account Number', fieldName: 'AccountNumber', type: 'text', sortable: false},
        {label: 'Site', fieldName: 'Site', type: 'text', sortable: true},
        {type: "button-icon", typeAttributes: {iconName: "utility:delete", name: "delete", iconClass: "slds-icon-text-error"},fixedWidth: 50}     
    ];

    accountData = [];
    isModalOpen = false;
    accountName= '';
    accountNumber = '';
    accountSite = '';

    connectedCallback(){
        this.getAccounts();
    }
    getAccounts(){
        getAccounts()
        .then(result =>{
            this.accountData = result;
        })
        .catch(error =>{

        })
    }

    handleRowAction(event) {
		if (event.detail.action.name === "delete") {
			this.deleteSelectedRow(event.detail.row);
		}
	}
    deleteSelectedRow(deleteRow) {
		let newData = JSON.parse(JSON.stringify(this.accountData));
		newData = newData.filter((row) => row.Id !== deleteRow.Id);
        this.accountData = newData;		
	}
    openAddAccountModal(){
        this.isModalOpen = true;
    }
    closeModal() {        
        this.isModalOpen = false;
    }
    handleChange(event){
        if(event.target.name == 'accountName'){
            this.accountName = event.target.value;
        }else if(event.target.name == 'accountNumber'){
            this.accountNumber = event.target.value;
        }else if(event.target.name == 'accountSite'){
            this.accountSite = event.target.value;
        }
    }
    addAccount(){
        let accountToInsert = {
            Name : this.accountName,
            AccountNumber: this.accountNumber,
            Site : this.accountSite
        }
        addAccount({
            account: JSON.stringify(accountToInsert)
        })
        .then(result =>{            
            this.addAccountToList(result)
        })
        .catch(error =>{
            this.error = error;
        })        
    }
    addAccountToList(account){
        let localList;            
        if(this.accountData.length > 0){                        
            localList =JSON.parse(JSON.stringify(this.accountData));                
        }else{
            localList = [];                
        }
         
        localList.push({
            Id: account.Id,
            Name : account.Name,
            AccountNumber : account.AccountNumber,
            Site : account.Site,            
        })                                        
        this.accountData = localList;
        this.isModalOpen = false;    
    }
}

addDeleteRowLWC.js-meta.xml

<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>54.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__AppPage</target>
        <target>lightning__RecordPage</target>
        <target>lightning__HomePage</target>
    </targets>
</LightningComponentBundle>

Output

If you guys have any question, please comment below, I'll be happy to answer your question.
#LWC, #LightningDataTable, #adddeleterowinlwc #salesforce #salesforcelightning

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