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@dvo/stamp

Tool for lightweight componentization.

  • 0.0.1
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STAMP

What problem does Stamp solve?

Quite often components are lightweight. By that I mean they are reused in a single place and reflect static state (usually from an array and vaery little change once rendered). Stamp is a very simple way to deal with this lightweight componentization requirement, in a native and hassle-free way.

The concept is simple:

  • you write the lightweight component (or stamp), within a <template> tag, inside a wrapper element that will received them;
  • you write a mutator function that populates the stamp with the data you want.
  • all methods are chainable, and when you're ready, just stamp() it!

Example code

For example, suppose you have a books section to display book cards. The state you want to reflect is:

const books = [
  {
    title: 'The hitchhicker\'s Guide to the Galaxy',
    author: 'Douglas Adams',
    link: 'https://example.com/hitchhiker'
  },
  {
    title: 'Room on the Broom',
    author: 'Julia Donaldson',
    link: 'https://example.com/witch'
  }
]

The HTML would look like:

<section id="books">
  <template id="tpl-book-card">
    <div>
      <a target="_blank" href="">
        <span className="book-card-title"></span>
      </div>
      by <span className="book-card-author></span>
    </div>
  </template>
</section>

Reflect that data with Stamp is just a matter of:

books.forEach(book =>
  //Get the stamp template
  Stamp('#tpl-book-card')
    // Define a mutator function
    .change(function (card) {
      card.querySelector('a')
        .setAttribute('href', book.link)
      card.querySelector('.book-card-title')
        .textContent = book.title
      card.querySelector('.book-card-author')
      .textContent = book.author
    })
    // And stamp it
    .stamp()
)

When you load a stamp that has previously been used, its configurations such as mutator function, cap and keep (see API) are retrieved as well. That means you don't have to keep a reference to the stamp object. It is more practical to load again from the same template.

And to make reloading a stamp easier, you can set an alias to it like so:

// Save an alias
Stamp('#tpl-book-card')
  .alias('bookCard')

// Then use it to retrieve the stamp
Stamp.get('bookCard')

Clearing the components later is also a breeze: running stamp.clear() will clear all stamps from that template, while stamp.clearAll() will clear every single element that is not a <template>. Both functions affect items in the stamp's target (by default, the template's container).

You can however, change the target container, so stamp() and clear() apply to a different container. You'd do that if you want to reuse the templates somewhere else. You can do so by calling:

Stamp('bookCard')
  .target('#some-other-container')

And there's some extra minor functionalities you can check out at the API section below.

API

  • get() :string Load a template by passing its selector. Stamp('selector') and Stamp.get('selector') are synonymous.

  • stamp() Creates the component from the template, mutates it and appends to the target (by default, the template's container).

  • alias() :string Give the current stamp an alias, so it's easy to retrieve it later by calling Stamp.get(alias).

  • change() :function Defines a mutator function to be called just before stamping. The function receives the component instance before it is appended to the DOM, so manipulations on it are cheaper and you don't get FOUC.

  • target() :string Pass a selector to define a new target for the stamp. By default, the target is the template's parent element.

  • keep() :number Set the number of the component's instances you do not want to delete when calling clear() or clearAll(). This setting will spare the first n components found.

  • cap() :number Set the maximum amount of this component the target may take. Additonal stamps (from the same template) will be ignored.

  • clear() Deletes all stamps from the current template in the current target (by default, the template's parent element).

  • clearAll() Deletes all elements in the current target, except for <template> tags. This will target not only stamps, so use it carefully.

  • execute() :function Allows you to run a callback on any point in the chain. The function will receive the stamp object as an argument. Use it for side-effects or debugging.

  • debug() A minor tool that logs to the console the current stamp configuration.

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Package last updated on 26 Jan 2020

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