Datatable Styling in LWC

You will learn the following things

Create a new component
Write Apex Class to fetch Account records
Fetch data to LWC from Apex
Create lightning datatable and load the account data to datatable
hide datatable checkbox
add slds text color to the table column
add an icon to the column with positions
add a background color to the column cell using slds colors
upload external CSS to the static resources
loading external CSS to component
adding an external CSS class to the column cell
adding an external CSS class to the table header

Video Tutorial

Code

Create Lwc component datatableDemo and add the following code to the respective files.

datatableDemo.html

<template>
    <lightning-card title="Datatable styling in lwc">
        <template if:true={tableData}>
            <div class="myTable">
            <lightning-datatable
            key-field="Id"
            data={tableData}
            columns={columns}
            hide-checkbox-column
            ></lightning-datatable>
        </div>
        </template>
       
    </lightning-card>
</template>

datatableDemo.js

import { LightningElement, wire } from 'lwc';
import getAccounts from '@salesforce/apex/tableController.getAccounts'
import {loadStyle} from 'lightning/platformResourceLoader'
import COLORS from '@salesforce/resourceUrl/colors'
const COLUMNS = [
    {label:'Account Name', fieldName:'Name',  cellAttributes:{
        class:{fieldName:'accountColor'}
    }},
    {label:'Annual Revenue', fieldName:'AnnualRevenue', type:'currency', cellAttributes:{
        class:{fieldName:'amountColor'},
        iconName:{fieldName:'iconName'}, iconPosition:'right'
    }},
    {label:'Industry', fieldName:'Industry', type:'text', cellAttributes:{
        class:{fieldName:'industryColor'}
    }},
    {label:'Phone', fieldName:'Phone', type:'phone'},
]
export default class DatatableDemo extends LightningElement {
    tableData
    columns = COLUMNS
    isCssLoaded = false

    @wire(getAccounts)
    accountsHandler({data, error}){ 
        if(data){ 
            
            this.tableData = data.map(item=>{
                let amountColor = item.AnnualRevenue <500000 ? "slds-text-color_error":"slds-text-color_success"
                let iconName = item.AnnualRevenue <500000 ? "utility:down":"utility:up"
                return {...item, 
                    "amountColor":amountColor,
                    "iconName":iconName,
                    "industryColor":"slds-icon-custom-custom12 slds-text-color_default",
                    "accountColor":"datatable-orange"
                }
            })
            console.log(this.tableData)
        }
        if(error){
            console.error(error)
        }
    }

    renderedCallback(){ 
        if(this.isCssLoaded) return
        this.isCssLoaded = true
        loadStyle(this, COLORS).then(()=>{
            console.log("Loaded Successfully")
        }).catch(error=>{ 
            console.error("Error in loading the colors")
        })
    }

}

datatableDemo.js-meta.xml

<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>50.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__AppPage</target>
    </targets>
</LightningComponentBundle>

Create an Apex class tableController.cls and add the following code to the file.

tableController.cls

public with sharing class tableController {
    @AuraEnabled(cacheable=true)
    public static List<Account> getAccounts() {
        return [SELECT Id, Name, AnnualRevenue, Industry, Phone from Account];
    }
}

Create a file on your desktop name it colors.css and add the following code.

colors.css

.datatable-orange{
  color:#fff;
  background-color:#e06000;
}
.datatable-orange:hover{
  color:#000;
  background-color:#e06000;
}
.myTable table>thead .slds-cell-fixed.slds-has-button-menu, .myTable table>thead .slds-cell-fixed.slds-has-button-menu:hover{
  background: antiquewhite;
}

Upload the 'colors.css` to the static resources.

Final Output

Now place your component to the record page. You will see the following output

Fig:1 datatableDemo component after pacing on the page