What is a way to ensure that hidden elements with display:block do not retain their original space in the DOM?

Here is a specific code snippet I'm working with: https://jsfiddle.net/uyg8tauo/. In this snippet, multiple div elements are initially set to display: none;. My goal is to make them appear by changing the display property to block when the corresponding buttons are clicked.

The challenge I face is ensuring that the elements cascade properly based on the button clicks. For example, clicking the first button multiple times should reveal elements with ids of "school_" + n one after another. Similarly, clicking the second button should cause the div with id "noSchool_" + n to appear after the previously revealed elements, not in its initial DOM position.

It's important to note that this solution needs to work on older browsers like IE8< and that the div elements must be pre-defined, without dynamic addition. Any help or feasible solutions would be greatly appreciated!

Thank you.

Answer №1

When you re-insert a DOM element back into its original container, it will automatically be positioned at the end of the DOM hierarchy. Let's illustrate this with an example:

<div id="holder">
  <div id="btn-1">Button 1</div>
  <div id="btn-2">Button 2</div>
  <div id="btn-3">Button 3</div>
</div>

By executing the following code snippet:

document.getElementById('holder').appendChild(document.getElementById('btn-1'));

You would effectively rearrange the elements in the DOM structure as shown below:

<div id="holder">
  <div id="btn-2">Button 2</div>
  <div id="btn-3">Button 3</div>
  <div id="btn-1">Button 1</div>
</div>

This behavior is well documented in the resource provided in the initial paragraph: https://developer.mozilla.org/en/docs/Web/API/Node/appendChild

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