Expandable CSS Sticky Header that Grows and Pushes Content Down

I am currently working on implementing a Sticky Header feature, where the header will expand (depicted by the Green Box) if the user selects more documents in the left grid (not shown).

I need help figuring out how to achieve this, as most resources recommend using position: fixed for sticky headers with a fixed padding-top on the body.

Issue - The blue sticky header is currently overlapping the Green box when additional document titles are added.

Below are 3 boxes: Black represents the overall container, Green is the top Sticky Header, and Blue denotes the Body content.

The objective is to ensure that the Sticky Header remains fixed while allowing users to scroll down through the lengthy body content.

As an alternative, I am currently using the JavaScript code snippet below, but I am curious if there is a way to achieve this purely with CSS and flexbox without involving JavaScript:

document.getElementById("bluebox-body-id").style.paddingTop = (50 * numberOfDocuments).toString()+ "px";

https://i.sstatic.net/nZ0dh.png

https://www.w3schools.com/howto/howto_css_fixed_menu.asp

Just a heads up, I am utilizing the Angular framework for this project.

htmlcssangularsticky-footer

Answer №1

By adjusting the position property, you can fix this issue.

Simply update it to sticky: position:sticky

Answer №2

It seems like the issue is related to specific CSS styles causing this effect, rather than default HTML/CSS. You may need to adjust the CSS values to pinpoint the cause.

To help visualize the desired outcome, I have provided an example below: 

.container {
  border: 1px solid;
  background: cyan;
  position: fixed;
  padding: 10px;
  top: 10px;
  bottom: 10px;
  right: 10px;
}

.container__top {
  border: 1px solid;
  background: green;
  padding: 5px;
}

.container__bottom {
  border: 1px solid;
  background: lightblue;
  padding: 5px;
}
<div class="container">

  <section class="container__top">
    <ul>
      <li>a</li>
      <li>b</li>
      <li>c</li>
      <li>d</li>
      <li>e</li>
    </ul>
  </section>

  <section class="container__bottom">
    <ul>
      <li>1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
      <li>5</li>
    </ul>
  </section>

</div>

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