Trouble with Angular 7: mat-tab active style not showing up

<div class="navigation">
>         <mat-tab-group disableRipple="true"  selectedIndex="0">
>             <mat-tab label="Label1"> </mat-tab>
>             <mat-tab label="label 2">  </mat-tab>
>             <mat-tab label="Label 3">  </mat-tab>
>         </mat-tab-group>
>     </div>

I have the above html code where I'm trying to set 'Label1' as the default tab. However, despite using selectedIndex="0", the active style is not being applied until I physically click on the tab.

When the tab is active, it should display a white color label. But this behavior is not observed when the tab is selected by default through selectedIndex="0".

For reference, I am working with Angular 7 and below are the CSS styles specific to Material Tabs in my component:

CSS Styles related to Material Tab:

.mat-ink-bar{
>         background-color: #ffffff !important;
>         border-bottom-color:solid #FFFFFF!important;
>         width: 113px !important;
>         height:4px !important;
>         margin-left: 2rem;
>         margin-bottom:0px;
>         
>     }
>     
>     .mat-tab-label, .mat-tab-label-active{
>         color:#FFFFFF;
>         background-color: transparent;
>         font-family: "verdana";
>         font-size: 20px;
>         font-weight:500;
>         max-width: 113px;
>         padding: 0px;
>         margin:0px;
>     }

Your suggestions would be greatly appreciated. Thank you in advance for any help. Apologies for any formatting issues.

cssangularangular-material

Answer №1

Here are some custom material tab styles I've defined in my component's CSS file

Your styling won't be effective in your component's CSS because the tab component styles are encapsulated. You'll need to either include your style in a global stylesheet or use the deep combinator:

/deep/ .mat-tab-ink-bar {
   ...
}

Additionally, your current style is being applied to all tab labels, regardless of their active state:

.mat-tab-label, .mat-tab-label-active {

This should probably be changed to:

.mat-tab-label.mat-tab-label-active {

or simply just .mat-tab-label-active.

Answer №2

While it may be a bit overdue, the information shared here could still benefit someone out there.

Currently, my setup involves Angular 14 paired with Material 14.

In order to maintain the active appearance of tabs in Material design even when they lose focus, I utilized the devtools Elements inspector to analyze styles and devised a solution as shown below.

To implement this fix, simply add the following code snippet to the scss file of your component:

:host ::ng-deep {
  .mat-tab-label-active {
      opacity: 1; // <-- crucial for maintaining tab visibility
  }
}

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