@strata-packages/offcanvas

@strata-packages/offcanvas

Lightweight offcanvas drawer component. Works standalone (no dependencies) or integrated with Strata CSS.

Installation

# Standalone
npm install @strata-packages/offcanvas

# With Strata (already included in strata.components.js — do not install separately)
npm install strata-css

Usage

Standalone (no Strata CSS)

<link  rel="stylesheet" href="node_modules/@strata-packages/offcanvas/offcanvas.css">
<script src="node_modules/@strata-packages/offcanvas/offcanvas.js"></script>

With Strata CSS

<script src="node_modules/strata-css/dist/strata.components.js"></script>

Available as Strata.Offcanvas.open() / Strata.Offcanvas.close().

HTML Structure

Two attributes drive everything — JS never touches classes:

Attribute	Purpose	Values
data-st-side	Slide direction — set once in HTML, CSS-driven	left / right / top / bottom
aria-hidden	Open/close state — JS only updates the value	"true" / "false"

<!-- Trigger -->
<button data-st-toggle="offcanvas" data-st-target="#myDrawer">Open</button>

<!-- Drawer (slides from the right) -->
<div id="myDrawer" class="offcanvas" data-st-side="right" aria-hidden="true" aria-modal="false">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title">Title</h5>
    <button data-st-dismiss="offcanvas">&times;</button>
  </div>
  <div class="offcanvas-body">
    Content here.
  </div>
</div>

Direction Variants

Set data-st-side on the .offcanvas element — CSS handles the rest:

data-st-side	Slides in from
left	Left
right	Right
top	Top
bottom	Bottom

Programmatic API

// Standalone
StrataOffcanvas.open('#myDrawer')
StrataOffcanvas.close()

// With Strata
Strata.Offcanvas.open('#myDrawer')
Strata.Offcanvas.close()

// Pass element directly
Strata.Offcanvas.open(document.getElementById('myDrawer'))

Static Backdrop

Prevents closing on backdrop click:

<div class="offcanvas" data-st-side="right" data-st-backdrop="static" aria-hidden="true" aria-modal="false">

Events

document.addEventListener('st:offcanvas:open', function (e) {
  console.log('opened:', e.detail.offcanvas)
})

document.addEventListener('st:offcanvas:close', function (e) {
  console.log('closed:', e.detail.offcanvas)
})

Dynamic Direction

Set data-st-side before calling open() — JS never touches it, so it is always safe to change:

const drawer = document.getElementById('myDrawer')
drawer.setAttribute('data-st-side', 'left')
Strata.Offcanvas.open(drawer)