Tree View
Expandable/collapsible nested hierarchy using nested data-list.
Live Demo
Source
HTML + JavaScript
<div data-component="tree-view">
<div data-list="nodes">
<template>
<div class="tree-node">
<div class="tree-header" data-action="toggleNode">
<span data-bind="expanded ? '▼' : '▶'"></span>
<span data-bind="label"></span>
</div>
<!-- Nested data-list for children -->
<div data-show="expanded" data-list="children">
<template>
<div class="tree-node">
<span data-bind="label"></span>
</div>
</template>
</div>
</div>
</template>
</div>
</div>
<script>
wildflower.component('tree-view', {
state: {
nodes: [
{ label: 'src', icon: '📁', expanded: true, children: [
{ label: 'components', icon: '📁', expanded: false, children: [
{ label: 'Header.js', icon: '📄', children: [] },
{ label: 'Footer.js', icon: '📄', children: [] }
]},
{ label: 'utils', icon: '📁', expanded: false, children: [
{ label: 'format.js', icon: '📄', children: [] }
]}
]}
]
},
toggleNode(e, el, { item }) {
item.expanded = !item.expanded;
}
});
</script>Key Points
- Nested
data-listelements render tree levels. Each node'schildrenarray becomes its own list data-show="expanded"on the children container handles expand/collapse per node- Action handlers receive
{ item }in list context and work at any nesting depth; no need to track indices data-bind="expanded ? '▼' : '▶'"uses a ternary expression to swap the chevron icon