Ensure that the tab's content fills up the entire space provided and prevent the need for a vertical scrollbar to appear

Is there a way to make the tab content take up 100% of the available space without causing a vertical scroll due to the height of the tab itself? I am currently using ng-bootstrap and need assistance with this specific issue. You can review my code in the styles.css file and /app/app.component.html here: https://stackblitz.com/edit/angular-ng-bootstrap-9obrp7?file=app%2Fapp.component.html

https://i.sstatic.net/ykwjT.gif

I am aware that I can solve this by using 'overflow', but I am curious as to why this problem is occurring in the first place. Additionally, ngb-tabset introduces two elements with classes .tab-content and .tab-pane, which I have set the height to 100% for. Otherwise, the tab content does not expand properly.

This is snippet of my code:

<ngb-tabset [destroyOnHide]="false">
  <ngb-tab id="nav-tabContent" class="h-100 border1" title="Relación causa con Emoción">
    <ng-template ngbTabContent>
      <div class="border2 h-100">holi</div>
    </ng-template>
  </ngb-tab>
</ngb-tabset>

body,html{
  height:100%;
  margin:0px;
  padding:0px;
}

.h-100{
  height:100%;
}

.tab-content {
  height:100%;
}
.tab-pane {
  height: 100%;
}
css

Answer №1

The issue is arising because the total height is being calculated as 

100% + the height of the tab element
.

To resolve this, you can utilize flexbox. Transform the container into a flex container and assign it 100% height. Then utilize the flex property on its children to decide if they should stretch to occupy the available space.

In your code, I have used the ngb-tabset element as the container and included the following CSS to ensure it takes up 100% of the space and displays the nav-tabs and tab-content in a column:

ngb-tabset {
  display: flex;
  flex-direction: column;  /* displaying child elements in a column */
  height: 100%;            /* utilizing full available height */
}

The next step is to specify that the tab-content should stretch to occupy the remaining height after the nav-tabs, while preventing the nav-tabs from stretching:

ngb-tabset .nav-tabs {
  flex: 0; /* no growth or shrinkage */
}
ngb-tabset .tab-content {
  flex: 1; /* grow or shrink to fill the remaining space */
}

(Please note that I only added the CSS for the container in your live code, so some additional CSS might be achieving a similar effect, but typically both sets of CSS would be required.)

Example in Action: (I introduced a container with id ngb-tabset to replace the ngb-tabset element in your Angular code)

body,html {
  height: 100%;
  margin: 0px;
  padding: 0px;
}

#ngb-tabset, ngb-tabset {
  display: flex;
  flex-direction: column;
  height: 100%;
}

#ngb-tabset .nav-tabs, ngb-tabset .nav-tabs {
  flex: 0; /* no growth or shrinkage */
}

#ngb-tabset .tab-content, ngb-tabset .tab-content {
  flex: 1; /* grow or shrink to fill the remaining space */
}

.tab-pane {
  height: 100%;
}

.border2 { border: 1px solid blue;}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">

<div id="ngb-tabset">

  <ul class="nav nav-tabs justify-content-start">
    <li class="nav-item">
      <a class="nav-link active" href="" role="tab" id="nav-tabContent" aria-controls="nav-tabContent-panel" aria-expanded="true" aria-disabled="false">
          Relación causa con Emoción
        </a>
    </li>
  </ul>
  <div class="tab-content">
    <div role="tabpanel" class="tab-pane active" id="nav-tabContent-panel" aria-expanded="true">
      <div class="border2 h-100">holi</div>
    </div>
  </div>

</div>

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