render-tmpl

Use <template> as a rendering engine, < 100 lines of code.

• Alpine/Vue-like directive notation data-s-{text,attr,show} for use with <template> elements.
• No reactivity, pairs well with web components/custom elements.
• copy-paste onto your page (< 100 lines of code or ESM import).

Quickstart

<template data-s-tmpl="tmpl">
  <div data-s-text="greeting"></div>
  <img data-s-attr="src=url,alt=greeting" />
</template>
<script type="importmap">
  { "imports": { "render-tmpl": "https://esm.sh/render-tmpl" } }
</script>
<script type="module">
  import { renderTmpl } from "render-tmpl";
  document.appendChild(
    renderTmpl(document.querySelector("[data-s-tmpl=tmpl]"), {
      greeting: "hello",
      url: "my-url",
    }),
  );
</script>

Directives

data-s-tmpl

data-s-tmpl is a convention to denote templates that will be used with render-tmpl.

Usage: <template data-s-tmpl="loading"></template>.

data-s-show

data-s-show will set display: none; if the expression is false and will unset display if it's true.

Usage: <div data-s-show="isShown"></div>

Use of negation is allowed with !, eg. <div data-s-show="!isLoading"></div>, note: any arbitrary number of ! works, but other boolean logic (&&, ||, ()) will not work, this is because the value is not eval-ed as JavaScript.

data-s-text

Set the textContent of the node to the value of the referenced variable.

Usage: <p data-s-text="message"></p>

data-s-attr

Set attributes on the element based on provided key-value attr1=value1,attr2=value2 pairs.

Aliases: data-s-attrs

Usage: <img data-s-attr="src=url,alt=greeting" /> sets src and alt attributes to the values contained in url and greeting variables.

data-s-slot

Used as the element into which sub-templates are injected.

Usage:

<template data-s-tmpl="tmpl">
  <div data-s-slot></div>
  <template data-s-tmpl="no-results">
    No Results <span data-s-text="requestId"></span>
  </template>
</template>
<script type="module">
  import { renderTmpl } from "render-tmpl";
  document.appendChild(
    renderTmpl(document.querySelector("[data-s-tmpl=tmpl]"), {}, (tmpl) =>
      renderTmpl(tmpl.querySelector("[data-s-tmpl=no-results]"), {
        requestId: "1234",
      }),
    ),
  );
</script>

Requirements

• Node 20
• npm v8+

Setup

1. Clone the repository
2. Run npm install installs all required dependencies.

npm scripts

• npm test will run tests using the Node.js test runner and the node:test module.
• npm run format will run prettier on all the examples files (and tests).

LICENSE

Code is licensed under the MIT License.