How to Add or Remove CSS style from the component/element during runtime or dynamically

By | June 15, 2021

In this blog, we will discuss how to Add and Remove CSS style from the component or element during runtime.

To add and remove CSS style from the component or element, you need to use $A.util.addClass(object element ,string class) and $A.util.removeClass(object element, string class) methods, where “element” is the component to add and remove the CSS style from and “class” is the CSS class to be applied on the component.

To find component, use component.find(‘Cmp’),where Cmp is the aura:id attribute value.

Let’s take an example to add and remove style from the component or element during runtime

Create Lightning Component

SampleComponent

<aura:component>    
    <div aura:id="Cmp">SalesForce Lightning</div><br/>
    <lightning:button onclick="{!c.addCSS}" label="Add Style" />
    <lightning:button onclick="{!c.removeCSS}" label="Remove Style" />
</aura:component>

SampleCss

.THIS.changeStyle {
    background-color:white;
    color:black;
}

SampleController

  • To add CSS style use $A.util.addClass(object element, string class) method and to remove CSS style use $A.util.removeClass(object element, string class) method.
  • Whenever the user clicks on “Add style” button the “addclass” controller method gets invoked and it will appends the CSS style to the component or element.
  • Similary,when the user clicks on “Remove style” button the “removeclass” controller method gets invoked and it will remove the CSS style from the component or element. Refer to the below code.
({
    addCSS: function(cmp, event) {
        var cmpDiv = cmp.find(‘Cmp’);
        $A.util.addClass(cmpDiv, 'changeStyle');
    },
    removeCSS: function(cmp, event) {
        var cmpDiv = cmp.find(‘Cmp’);
        $A.util.removeClass(cmpDiv, 'changeStyle');
    }  
})
  • Here is the output, so now when the user clicks on the “Add style” button the background and the text color of “Salesforce Lightning” text will change.
Add Style during runtime
Add Style during runtime
  • Similarly, when user clicks on “Remove style” button the background and the text color of “Salesforce Lightning” text will be removed as shown in the below images.
Remove style during runtime
Remove style during runtime

This way you can add and/or remove CSS style from the component or element. We hope you may find this blog resourceful and helpful.

We hope you may find this blog resourceful and helpful. If you still have concerns and need more help, please contact us at salesforce@greytrix.com.

About Us
Greytrix – a globally recognized and one of the oldest Sage Development Partner, as a Salesforce Product development partner offers a wide variety of integration products and services to the end users as well as to the Partners and Sage PSG across the globe. We offer Consultation, Configuration, Training and support services in out-of-the-box functionality as well as customizations to incorporate custom business rules and functionalities that require apex code incorporation into the Salesforce platform.

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For more information, please contact us at  salesforce@greytrix.com. We will be glad to assist you.

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