[WordPress] 外掛分享： Elmspur Cascade – Dropdown Redirect

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原文外掛簡介

Elmspur Cascade adds a cascading dropdown redirect block to the WordPress block editor. Visitors pick from one or more dependent dropdowns — for example Category → Topic → Page — and are redirected to the URL attached to their final choice. No form plugin or shortcode is required.
Each dropdown filters the next: choosing a value in one level determines the options available in the next. When the visitor reaches an item that has a URL, they are sent to it — either immediately, or after clicking a button you can label yourself.
Features

Native block — works in posts, pages, the Site Editor, templates, template parts, and block widget areas. Compatible with FSE/block themes.
Visual tree builder — point-and-click interface to add, edit, nest, and reorder dropdown items without touching JSON.
Up to 5 levels of dependent dropdowns. Branches don’t have to reach the maximum; a 2-level branch redirects from level 2 and remaining dropdowns stay disabled.
Redirect immediately on final selection, or show a button the visitor clicks to go.
Open in a new tab option.
Custom placeholder text for each level.
Navigation block variant — a compact version that lives inside the core Navigation block, inline with your other menu links.
Wide and full alignment support; inherits your theme’s button styles.
No form builder required. No shortcodes. No build step.

Use cases

Support sites: Product → Issue Type → Help article
Multi-location businesses: Country → City → Location page
Course sites: Subject → Course → Lesson

Companion add-on
A separate add-on, distributed from elmspur.com (not from WordPress.org), adds saved/reusable dropdown trees: define a tree once, link it to as many blocks as you like, and edits propagate site-wide. It is optional — this plugin is fully functional on its own.
The JSON format
An array of items. Each item has a “label” and either “children” (an array of more items) or a “url”.
[
{
“label”: “Category A”,
“children”: [
{
“label”: “Subcategory A1”,
“children”: [
{ “label”: “Page one”, “url”: “https://example.com/a/a1/one” },
{ “label”: “Page two”, “url”: “https://example.com/a/a1/two” }
]
}
]
}
]
Settings (block sidebar)

Menu data — the JSON hierarchy (also editable via the visual tree builder).
Redirect immediately on final selection — skip the Go button.
Open in a new tab.
Button label.
Placeholder text for each level.