Shopify Polaris Web Components

Shopify Polaris Web Components

Use this skill when building UI for Shopify App Home surfaces using Polaris Web Components.

When to Use

• Building App Home pages (the app surface outside of Shopify Admin iframe)
• Creating UI with s-* custom elements
• Designing layouts with s-section, s-stack, s-box
• Building forms, modals, or lists for App Home

Important: App Home uses Polaris Web Components (s-* elements), NOT Polaris React (@shopify/polaris). These are different technologies.

Polaris React vs Web Components

Core Components

Page Structure

<s-page heading="Dashboard">
  <s-section heading="Overview">
    <!-- Content -->
  </s-section>
  
  <s-section heading="Settings">
    <!-- More content -->
  </s-section>
</s-page>

Layout with Stack

<!-- Vertical stack (default) -->
<s-stack direction="block" gap="large">
  <s-text>Item 1</s-text>
  <s-text>Item 2</s-text>
</s-stack>

<!-- Horizontal stack -->
<s-stack direction="inline" gap="medium" alignItems="center">
  <s-button>Cancel</s-button>
  <s-button variant="primary">Save</s-button>
</s-stack>

<!-- Stack with justification -->
<s-stack 
  direction="inline" 
  justifyContent="space-between"
  alignItems="center"
>
  <s-text variant="headingMd">Title</s-text>
  <s-button>Action</s-button>
</s-stack>

Section (Card-like Container)

Use s-section for grouped content with optional heading:

<!-- Section with heading -->
<s-section heading="Chat Widget Settings">
  <s-stack direction="block" gap="medium">
    <s-text>Configure your widget appearance.</s-text>
    <!-- Form fields -->
  </s-stack>
</s-section>

<!-- Section without heading -->
<s-section>
  <s-text>Simple content block</s-text>
</s-section>

Box (Generic Layout Container)

Use s-box for padding, borders, and spacing - NOT for cards:

<!-- Box with padding -->
<s-box padding="large">
  <s-text>Padded content</s-text>
</s-box>

<!-- Box with border -->
<s-box 
  padding="medium" 
  borderWidth="base" 
  borderRadius="base"
>
  <s-text>Bordered content</s-text>
</s-box>

<!-- Box for spacing -->
<s-box paddingBlockStart="large">
  <s-text>Content with top margin</s-text>
</s-box>

Rule: Use s-section for card-like containers, s-box for layout/spacing only.

Buttons

<!-- Primary action -->
<s-button variant="primary" type="submit">
  Save Settings
</s-button>

<!-- Default button -->
<s-button>Cancel</s-button>

<!-- Destructive -->
<s-button variant="primary" tone="critical">
  Delete
</s-button>

<!-- Disabled -->
<s-button disabled>Unavailable</s-button>

<!-- With click handler (in JS) -->
<s-button id="save-btn">Save</s-button>
<script>
  document.getElementById('save-btn').addEventListener('click', handleSave);
</script>

Text

<!-- Headings -->
<s-text variant="headingLg">Large Heading</s-text>
<s-text variant="headingMd">Medium Heading</s-text>
<s-text variant="headingSm">Small Heading</s-text>

<!-- Body text -->
<s-text>Default body text</s-text>
<s-text variant="bodySm">Small body text</s-text>

<!-- Tones -->
<s-text tone="subdued">Muted text</s-text>
<s-text tone="critical">Error text</s-text>
<s-text tone="success">Success text</s-text>

Banner

<!-- Info banner -->
<s-banner>
  <p>This is an informational message.</p>
</s-banner>

<!-- Critical banner -->
<s-banner tone="critical">
  <p>Something went wrong. Please try again.</p>
</s-banner>

<!-- Success banner -->
<s-banner tone="success">
  <p>Settings saved successfully!</p>
</s-banner>

<!-- Dismissible banner -->
<s-banner tone="warning"
  <p>Your trial ends in 3 days.</p>
</s-banner>

Link

<s-link href="/settings">Go to Settings</s-link>

<s-link href="https://shopify.dev" external>
  Documentation
</s-link>

Form Elements

<!-- Text field -->
<s-text-field 
  label="Store name"
  value="My Store"
  helpText="This appears in your widget"
></s-text-field>

<!-- Select -->
<s-select label="Language">
  <option value="en">English</option>
  <option value="es">Spanish</option>
</s-select>

<!-- Checkbox -->
<s-checkbox label="Enable notifications" checked></s-checkbox>

Common Patterns

Settings Page

<s-page heading="Settings">
  <s-stack direction="block" gap="large">
    
    <s-section heading="General">
      <s-stack direction="block" gap="medium">
        <s-text-field 
          label="Welcome message"
          value="Hello! How can we help?"
        ></s-text-field>
        <s-checkbox label="Enable auto-reply"></s-checkbox>
      </s-stack>
    </s-section>
    
    <s-section heading="Appearance">
      <s-stack direction="block" gap="medium">
        <s-select label="Theme">
          <option value="light">Light</option>
          <option value="dark">Dark</option>
        </s-select>
      </s-stack>
    </s-section>
    
    <s-box paddingBlockStart="large">
      <s-stack direction="inline" gap="medium" justifyContent="flex-end">
        <s-button>Cancel</s-button>
        <s-button variant="primary">Save</s-button>
      </s-stack>
    </s-box>
    
  </s-stack>
</s-page>

Empty State

<s-section>
  <s-stack direction="block" gap="medium" alignItems="center">
    <s-text variant="headingMd">No campaigns yet</s-text>
    <s-text tone="subdued">
      Create your first campaign to get started.
    </s-text>
    <s-button variant="primary">Create Campaign</s-button>
  </s-stack>
</s-section>

List with Actions

<s-section heading="Campaigns">
  <s-stack direction="block" gap="none">
    
    <s-box padding="medium" borderBlockEnd="base">
      <s-stack direction="inline" justifyContent="space-between" alignItems="center">
        <s-stack direction="block" gap="extraSmall">
          <s-text variant="headingSm">Welcome Series</s-text>
          <s-text tone="subdued">Active • 1,234 sent</s-text>
        </s-stack>
        <s-button>Edit</s-button>
      </s-stack>
    </s-box>
    
    <s-box padding="medium" borderBlockEnd="base">
      <s-stack direction="inline" justifyContent="space-between" alignItems="center">
        <s-stack direction="block" gap="extraSmall">
          <s-text variant="headingSm">Abandoned Cart</s-text>
          <s-text tone="subdued">Paused • 567 sent</s-text>
        </s-stack>
        <s-button>Edit</s-button>
      </s-stack>
    </s-box>
    
  </s-stack>
</s-section>

TypeScript Support

Add types for s-* components in your tsconfig.json:

{
  "compilerOptions": {
    "types": ["@shopify/polaris-types"]
  }
}

Best Practices

1. Use s-section for cards - Not s-box
2. Use s-box for layout only - Padding, borders, spacing
3. Prefer s- over custom divs* - Only use div when s-* can't achieve the layout
4. Use semantic structure - s-page > s-section > content
5. Consistent spacing - Use gap props, not manual margins
6. Check the docs - Components have many props not shown here

When to Use Custom Styles

Only use plain div and inline styles when:

• The user explicitly requests it
• After trying s-* components and they can't achieve the required layout
• For very specific visual effects not supported by Polaris

References

• Polaris Web Components
• Using Polaris Components
• App Home Overview
• Component Reference

Source: tamiror6/shopify-app-skills — distributed by TomeVault.