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choo-lazy-view

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choo-lazy-view

Lazily fetch view when needed

0.1.0
Source
npm

Version published: 7 years ago

Weekly downloads: 6; decreased by-33.33%

Maintainers: 1

Weekly downloads

Created: 7 years ago

Source

choo-lazy-view

Lazily load view views as they are invoked by the router. Built for split-require but sohuld work with any software with a similar callback signature.

Usage

var splitRequire = require('split-require')
var LazyView = require('choo-lazy-view')
var html = require('choo/html')
var choo = require('choo')

var app = choo()

app.route('/', main)
app.route('/a', LazyView.create((callback) => splitRequire('./a', callback)))
app.route('/b', LazyView.create((callback) => splitRequire('./b', callback)))

module.exports = LazyView.mount(app, 'body')

function main () {
  return html`
    <body class="Home">
      <h1>home</h1>
      <a href="/a">a</a><br>
      <a href="/b">b</a>
    </body>
  `
}

API

The module exposes a Nanocomponent class with two static methods which are used for wrapping your views and choo.mount.

`LazyView.create(callback, loader?)`

Accepts a callback and an optional loader view. The callback will be invoked when the returned function is called upon (called immediately in node). The callback in turn should load the required view and relay it's response (or error) back to the caller.

app.route('/page', LazyView.create(function (callback) {
  fetchViewSomehow(callback)
}))

The second argument is optional and should be a function or a DOM node which will be displayed while loading. By default the node used to mount the application in the DOM is used as loader (meaning the view remians unchanged while loading).

app.route('/a', LazyView.create(
  (callback) => splitRequire('./a', callback),
  (state, emit) => html`<h1>Loading view…</h1>`
))

`LazyView.mount(app, selector)`

Wrapper function for app.mount. Returns a promise which resolves once the application is ready. This is needed because split-require resolves modules asyncronously.

// server.js
Promise.resolve(require('./index')).then(function (app) {
  var html = app.toString('/a')
})

Extending LazyView

You may extend on LazyView to add a shared framework wrapper, e.g. a header, footer etc.

// components/view/index.js
var html = require('choo/html')
var LazyView = require('choo-lazy-view')
var Header = require('../header')
var Footer = require('../footer')

module.exports = class View extends LazyView {
  createElement (state, emit) {
    return html`
      <body>
        ${state.cache(Header, 'header')}
        ${super.createElement(state, emit)}
        ${state.cache(Footer, 'footer')}
      </body>
    `
  }
}

// index.js
var choo = require('choo')
var splitRequire = require('split-require')
var View = require('./components/view')

var app = choo()

app.route('/', View.create((callback) => splitRequire('./views/home', callback)))

module.exports = View.mount(app, 'body')

Events

Events are namespaced under choo-lazy-view and emitted when loading views.

`choo-lazy-view:fetch`

When fetching a view.

`choo-lazy-view:done`

When view has been fetched and about to be rendered.

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Package last updated on 14 Jun 2018

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