Page Layouts

WordPress has “Page Templates” — a dropdown in the editor that lets you pick a layout per page (e.g. Default, Full Width, Landing Page). EmDash supports the same pattern using a select field.

How it works

1. Add a template select field to your pages collection
2. Create layout components for each option
3. Map the field value to a layout in your page route

No special system is needed — this uses EmDash’s existing select field and Astro’s component model.

Add the field

In the admin UI, add a select field to your pages collection with slug template and your layout options (e.g. “Default”, “Full Width”). Or include it in your seed data:

.emdash/seed.json

{
  "slug": "template",
  "label": "Template",
  "type": "select",
  "validation": {
    "options": ["Default", "Full Width"]
  },
  "defaultValue": "Default"
}

Create layout components

Each layout wraps content in your base layout with different styling:

src/layouts/PageDefault.astro

---
import type { ContentEntry } from "emdash";
import { PortableText } from "emdash/ui";
import Base from "./Base.astro";

interface Props {
  page: ContentEntry<any>;
}

const { page } = Astro.props;
---

<Base title={page.data.title}>
  <article class="page-default">
    <h1>{page.data.title}</h1>
    <PortableText value={page.data.content} />
  </article>
</Base>

<style>
  .page-default {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 2rem 1rem;
  }
</style>

src/layouts/PageFullWidth.astro

---
import type { ContentEntry } from "emdash";
import { PortableText } from "emdash/ui";
import Base from "./Base.astro";

interface Props {
  page: ContentEntry<any>;
}

const { page } = Astro.props;
---

<Base title={page.data.title}>
  <article class="page-wide">
    <h1>{page.data.title}</h1>
    <PortableText value={page.data.content} />
  </article>
</Base>

<style>
  .page-wide {
    max-width: var(--wide-width);
    margin: 0 auto;
    padding: 2rem 1rem;
  }
</style>

Wire up the route

In your page route, import each layout and map the template value:

src/pages/pages/[slug].astro

---
import { getEmDashEntry } from "emdash";
import PageDefault from "../../layouts/PageDefault.astro";
import PageFullWidth from "../../layouts/PageFullWidth.astro";

const { slug } = Astro.params;

if (!slug) {
  return Astro.redirect("/404");
}

const { entry: page } = await getEmDashEntry("pages", slug);

if (!page) {
  return Astro.redirect("/404");
}

const layouts = {
  "Default": PageDefault,
  "Full Width": PageFullWidth,
};

const Layout = layouts[page.data.template as keyof typeof layouts] ?? PageDefault;
---

<Layout page={page} />

The route stays small. Each layout component owns its own markup and styling. Adding a layout is: create a component, add the option to the select field, add a line to the map.

Tip

Use human-readable option names like “Full Width” rather than slugs like “full-width”. The value is both the stored value and the admin dropdown label.

Adding more layouts

Common choices from WordPress themes:

• Default — narrow content column, good for reading
• Full Width — wider content area, no sidebar
• Landing Page — no header/footer, hero sections
• Sidebar — content with a sidebar widget area

Each is just another Astro component in your src/layouts/ directory and another entry in the route’s layout map.