Hey guys, today in this post we are going to learn about How to add custom style css and change the text color & text size through JavaScript in lightning web component – LWC.
Files we used in this post example
lwcApplyCss.html | Lightning Web Component HTML | Template HTML file for used to write HTML element for user interface. |
lwcApplyCss.js | Lightning Web Component JavaScript | It is holding onclick functionality for add custom style CSS to change the text color and text size. |
lwcApplyCss.js-meta.xml | XML Meta File | It is used for where this lightning web component you want to exposed. |
lwcApp.app | Lightning Application File | It is used for call the component and preview on browser.. |
- Don’t forget to check out:- Adding a Custom Style CSS for Specific Role & Profile in Salesforce Click Here For More Information
Live Demo
You can download file directly from github by Click Here.
Other related post that would you like to learn in Salesforce
Step 1:- Create Lightning Web Component : lwcApplyCss.html
SFDX:Lightning Web Component >> New >> lwcApplyCss.html
lwcApplyCss.html [Lightning Web Component HTML]
<template>
<lightning-card title="Apply Custom Style CSS in LWC through Javascript" custom-icon="custom:icon15">
<div class="containerOver slds-p-around--medium slds-m-horizontal--medium" >
<h1>Easy to learn Step-by-Step online tutorial from www.w3web.net</h1>
<p class="listItem">Hi welcome to online tutorial www.w3web.net</p>
<p class="listItem">w3web.net is the place where you can learn step-by-step about Blog, WordPress, Salesforce Lightning Component, Lightning Web Component (LWC), Visualforce, Technical of Computer Application, Salesforce Plugin, JavaScript, Jquery, CSS, Computer and Accessories, Software Configuration, Customization, Development and much more…</p></br></br>
<div class="slds-text-align--center"><lightning-button label="Change Styling CSS" class="cssStyleBtn" variant="brand" onclick={customStyleChange}></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;">
<div style="width: 50%; float:left; display:inline-block">
<ul style="list-style-type: square; font-size: 16px; margin: 0 0 0 54px; padding: 0;">
<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>
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</ul>
</div>
<div style="width: 50%; float:left; display:inline-block">
<ul style="list-style-type: square; font-size: 16px; margin: 0 0 0 54px; padding: 0;">
<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>
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</ul>
</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>
Step 2:- Create Lightning Web Component : lwcApplyCss.js
SFDX:Lightning Web Component >> New >> lwcApplyCss.js
lwcApplyCss.js [LWC JavaScript File]
import { LightningElement } from 'lwc';
export default class LwcApplyCss extends LightningElement {
renderedCallback(){
this.template.querySelector("h1").style.color="blue";
this.template.querySelector("h1").style.textAlign="center";
this.template.querySelector("h1").style.fontSize="16px";
this.template.querySelector(".containerOver").style.boxShadow="0px 0px 5px #0007ea";
this.template.querySelectorAll(".listItem").forEach(item=>{
Object.assign(item.style, {color:'green',textAlign:'center',fontSize:'15px'});
});
}
customStyleChange(event){
this.template.querySelector("h1").style.fontSize="22px";
this.template.querySelector("h1").innerHTML="Easy to learn LWC tutorial from w3web.net";
this.template.querySelector(".containerOver").style.boxShadow="0px 0px 5px #ff0000";
this.template.querySelectorAll(".listItem").forEach(item=>{
Object.assign(item.style, {color:'red',textAlign:'center',fontSize:'18px'});
});
}
}
Step 3:- Create Lightning Web Component : lwcApplyCss.js-meta.xml
SFDX:Lightning Web Component >> New >> lwcApplyCss.js-meta.xml
lwcApplyCss.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>
Start Lightning Application
Step 4:- Create Lightning Application : lwcApp.app
From Developer Console >> File >> New >> Lightning Application
lwcApp.app [Component Application File]
<aura:application extends="force:slds">
<c:lwcApplyCss/>
</aura:application>
Further post that would you like to learn in Salesforce
How do you install styling in LWC?
LWC doesn't reflect a component's custom public properties into their corresponding HTML attributes. To give identity to a child element for styling, use a class attribute or a data-* attribute.
How do you add custom CSS in lightning component?
You can add CSS to a lightning component bundle by clicking the STYLE button in the Developer Console sidebar. after click on the STYLE button on component bundle, new CSS file is create with . css ext.
How do I add SLDS to Aura component?
You can use extends='force:slds' in lightning application. So it will automatically apply slds to lightning components that are related to application.
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