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

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

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

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.

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