<u1-tree1> - element

Treeview component

Features

• Keyboard navigation
• Focus on the next item that starts with the pressed key
• Expand/collapse events
• Lazy loading of children

Usage

<u1-tree1 aria-expanded=true>root
    <u1-tree1>Folder 1
        <u1-tree1>File 1.1</u1-tree1>
    </u1-tree1>
    <u1-tree1>Folder 3
        <u1-tree1>File 3.1</u1-tree1>
        <u1-tree1>File 3.2</u1-tree1>
    </u1-tree1>
</u1-tree1>

u1-tree1::part(row):hover {
    background:#00000004;
}
u1-tree1[aria-selected=true]::part(row) {
    background:#00000008;
}
u1-tree1::part(row):focus {
    outline:1px dotted;
}

API

Javascript

el.select(); // selects the element
el.toggleExpand(true/false/undefined); // undefined toggles
el.path(); // returns path to element
el.root(); // returns root element of the tree-item

Attributes

aria-expanded

This will initialy expand the tree: <u1-tree1 aria-expanded="true">...</u1-tree1>

This is either not expandable or like aria-expanded="false" if it has children. `

aria-live

<u1-tree1 aria-live></u1-tree1> This indicates, that the node has to be loaded.
The u1-tree1-collapse event will get a property event.load(promise) to load their children.

Events

expand / collapse

treeElement.addEventListener('u1-tree1-expand', (e) => {
    e.load && e.load(promise);
});
treeElement.addEventListener('u1-tree1-collapse', (e) => {...});

select

treeElement.addEventListener('u1-tree1-select', (e) => { ... });

CSS

Selector	Description
u1-tree1::part(row)	The row of the tree-item
u1-tree1[aria-selected=true]	Item when selected
u1-tree1:focus	Item has focus

Install

<link href="https://cdn.jsdelivr.net/gh/u1ui/tree1.el@x.x.x/tree1.min.css" rel=stylesheet>
<script src="https://cdn.jsdelivr.net/gh/u1ui/tree1.el@x.x.x/tree1.min.js" type=module></script>

Demos

custom.html
minimal.html
test.html

Todo

Ask me if you need it!

• Add support for multiple selection
• Drag and drop

About

• MIT License, Copyright (c) 2022 (like all repositories in this organization)
  
• Suggestions, ideas, finding bugs and making pull requests make us very happy. ♥