html-demo-element

web component inserts prism JS syntax colored HTML in demo-element before rendered UI for this HTML

Dependent prism script is located on unpkg.com CDN.

Sample

The code

<html-demo-element legend="Error case">
    <slotted-element src="https://badUrl.heck">
        <p slot="loading" hidden>Loading... ⏳ </p>
        <p slot="error" hidden>Something went wrong. 😭 </p>
    </slotted-element>
</html-demo-element>

<script type="module" src="https://unpkg.com/[email protected]/html-demo-element.js"></script>
<script type="module" src="https://unpkg.com/[email protected]/slotted-element.js"></script>

renders following content:

Use

If do not want to use template, include the script BEFORE inner content is modified. I.e. immediately after HTML and before scripts with components.

The use of template would defer the demo code injection after the source is rendered:

<html-demo-element legend="Error case">
    <template><i>Candle 🕯️</i></template>
</html-demo-element>

When you want to control where the source is located and where to render the code text, use slots:

<html-demo-element>
    <template>ignored</template>
    <template slot="source"> <i>Croissant 🥐️ </i></template>
    <p><code>slot="source"</code> defines where to get code     </p>

    <p><code>slot="demo"  </code> inject the html from source:  </p>
    <div slot="demo"> replaced with tasty demo </div>

    <p><code>slot="text"  </code> inject colored code text:     </p>
    <div slot="text"> replaced with colored code </div>
    
    <div slot="description"></div>
    <div slot="legend"></div>
</html-demo-element>

Live demo

• https://unpkg.com/[email protected]/demo/index.html
• https://unpkg.com/[email protected]/demo/advanced.html
• https://unpkg.com/[email protected]/demo/index.html

API

Slots

• source - the source code node. If omitted it would be taken either from embedded template content or from embedded into html-demo-element dom.
• text - placeholder where the highlighted code would be rendered. If omitted the text would be rendered on top of template or top of html-demo-element content.
• demo - placeholder where the code would be moved into for displaying live DOM( for HTML type ). If omitted it would be placed beneath of text slot
• legend - placeholder where the value of legend attribute would be rendered as H3. When omitted, it would be placed on top.
• description - placeholder where the value of description attribute would be rendered as dd. When omitted, it would be placed on beneath of description.

Properties and attributes

• source - the source code text. If the attribute is not defined, it would be initialized from source slot ^^
• type - one of prism js supported languages or auto. html, css, js imported by default. When omitted, assumed html.
• legend - optional heading for html-demo-element
• description - additional text in title, bellow the legend
• src - optional url to retrieve the source. When type is omitted, it is detected from content-type or extension.