What is hierarchical tree structure in HTML Bootstrap?

Bootstrap does not directly support a "hierarchical tree structure" in the way you might think of it. Bootstrap is a CSS framework, providing pre-built components and styling, but it doesn't offer a built-in structure for displaying hierarchical data like a tree.

However, you can achieve a tree-like structure using Bootstrap's components and some HTML and CSS customization. Here's how:

• Use nested lists: Bootstrap's ul and li elements are ideal for creating nested lists, which visually resemble a tree structure.
• Apply styling: Leverage Bootstrap's classes like list-group and list-group-item to style your lists. You can add custom CSS to further customize the appearance to achieve a tree-like effect, such as adding indentation for child nodes.
• Use icons: Bootstrap includes various icon classes (like fa-folder or fa-file) that can be used to represent different nodes in your tree.
• JavaScript libraries: For more interactive and dynamic tree structures, you can utilize JavaScript libraries like jQuery Treeview or Bootstrap Treeview. These libraries provide features like node expansion/collapse and drag-and-drop functionality.

Example:

<ul class="list-group">
  <li class="list-group-item">
    <i class="fa-folder"></i> Folder 1
    <ul class="list-group">
      <li class="list-group-item">
        <i class="fa-file"></i> File 1
      </li>
      <li class="list-group-item">
        <i class="fa-folder"></i> Subfolder 1
      </li>
    </ul>
  </li>
  <li class="list-group-item">
    <i class="fa-file"></i> File 2
  </li>
</ul>

This example demonstrates a basic tree structure using nested lists, icons, and Bootstrap classes. You can customize this further with CSS and JavaScript for a more sophisticated tree structure.