riot-typescript

v1.0.10

Published

2 years ago

Riot for TypeScript

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nippur72

RiotTS

Use Muut's Riot.js minimalistic framework from TypeScript.

Installation

Install via npm:

npm install --save riot-typescript

Use as a `<script>` (global namespace)

In your main .html file add in the header section:

<head>
   <!-- loads riot and riot-ts -->
   <script type="text/javascript" src="node_modules/riot/riot+compiler.js"></script>
   <script type="text/javascript" src="node_modules/riot-typescript/riot-ts.globals.js"></script>
</head>

Somewhere in your TypeScript files add the references:

/// <reference types="riot-typescript" />
/// <reference path="node_modules/riot-typescript/riot.global.d.ts" />

RiotTS can be referenced with the global name Riot
riot can be referenced with the global name riot

Use as a module

In your TypeScript files:

import * as Riot from "riot-typescript";

When mounting you will also need to reference to riot (for riot.mount):

Put a declaration somewhere:

declare module "riot/riot+compiler";

and then import riot:

import * as riot from "riot/riot+compiler";
...
riot.mount("*");

How to write elements

Differently from pure Riot.js, in RiotTS elements are written as TypeScript classes extending the base type Riot.Element.

There are no external .tag files, HTML templates are defined as pure strings or are loaded from .html files.

In brief:

Write elements as TypeScript classes
Extend the Riot.Element class
Use @Riot.template to define the template string or load it from URL
create instances of the element programmatically with className.createElement().

A class-element:

can have private properties/fields
can have getter/setter properties
can use inherited properties and methods
can use TypeScript Mixins
options are passed to the class constructor

Writing a basic element

In your element TypeScript code (e.g. elements/my-element.ts):

@Riot.template("my-element.html")
class MyElement extends Riot.Element
{
   // ...
}

In elements/my-element.html:

<my-element>
   <div>
      This is a my custom element
   </div>
</my-element>

In your main application file:

riot.mount('*');

The @template decorator

@Riot.template(param)

Sets the template for the element. The template parameter can be either:

a literal string e.g. "<my-hello><div>hello</div></my-hello>"
an external file (usually a .html) to be loaded via HTTP.
a tag name (works on with precompiled tags).

Example of an element <my-hello>:

@Riot.template("<my-hello><div>hello</div></my-hello>")
class MyHello extends Riot.Element
{
}

@Riot.template("elements/my-hello.html")
class MyHello extends Riot.Element
{
}

<my-hello>
   <div>hello</div>
</my-hello>

External tag files are loaded via HTTP requests, which can slow down the startup of very large applications. To avoid this, tags can be precompiled and concatenated into a single javascript file to be loaded more quickly. See how to setup a grunt task that does this.

Precompiled files can also be set to index tags by their tag names rather than their path, making it possible to use a shorter syntax:

@Riot.template("my-hello")
// instead of @template("elements/my-hello.html")

Lifecycle events shortcuts

Lifecycle events can be listened via this.on() or by defining the following methods in the class:

mounted() for the mount event
unmounted() for the unmount event
updating() for the update event
updated() for the updated event

Note: names ending in "-ed" have been choosen to not clash with already methods on the Riot.Element interface.

Example:

@Riot.template("<myel><span></span></myel>")
class MyEl extends Riot.Element {
   constructor(opts) {      
      super();
      
      // first way to listen to unmount event
      this.on("unmount",()=>
      {         
      });
   }
      
   // alternated shorter way 
   unmounted()   
   {               
   }
}

How to create elements programmatically

To create an element to be attached to the DOM use the creaeElement(opts) method:

var root = querySelector('#put_here');
el = test1.createElement();                
root.appendChild(el);

The created element is an instance of HTMLElement. To access the related riot-element:

var riotel = (el as any)._tag;  // ._tag is undocumented

Observables

The Riot library lets you define Observable objects that are not UI elements:

class MyObservable extends Riot.Observable 
{
   doSomething()
   {
      this.trigger("something-done");
   }
}

var a = new MyObservable();

a.on("something-done", ()=> {
   console.log("something has been done on 'a'!");
});

Router

The Riot library comes also with a minimalistic router, the API is the same also in TypeScript.

Example:

// install router hash changed function
riot.route((id,username) =>
{
   console.log(`hash changed to: id=${id} username=${username}`);
});

// start the router
riot.route.start();

// route to an address
riot.route("welcome/nino.porcino");

// stop the router
riot.route.stop();

Examples

A timer-based counter element

@Riot.template(`
<timer>
   <div>
      timer: { time }<br>
      trasclusion is '<yield/>'<br>                 
      <div each="{el in mylist}">iterating over array item "{el}"<br></div>
   </div>
</timer>`)

class Timer extends Riot.Element {
   time: number;
   timerHandle: number;  

   mylist = ["one","two","three"];
   
   // initializes the element with opts
   constructor(opts) {      
      super();
      this.time=opts.time||0;
      this.timerHandle=setInterval(() => this.ticks(),1000);      
   }
      
   ticks() {
      this.time++;
      this.update();  // refreshes the element
   }

   // handles the unmount event 
   unmounted()   
   {         
      clearInterval(this.timerHandle);
   }
}

Then install the element and mount on the page with:

riot.mount('*');   // mounts all elements

Precompiled tags

To speed up application startup times, tags can be precompiled in order to avoid compiling them at runtime.

Precompiled tags can be also concatenated into a single JavaScript file, avoiding to raise an HTTP request for each tag.

RiotTS can be switched to use precompiled files very easily by just including them (via <script src="..."></script>).

If the precompiled file is included, RiotTS will just use it, otherwise it will load tags via HTTP and compile them at runtime.

Precompiled files are normally intended for production, during the development they are usually turned off for a faster REPL cycle.

Precompiled files are generated with the grunt task grunt-riotts-precompile.

How to setup the task:

First install grunt-cli, grunt and grunt-riotts-precompile:

$ npm install -g grunt-cli
$ npm install grunt --save-dev
$ npm install grunt-riotts-precompile --save-dev

Use a Gruntfiles.js like this:

module.exports = function(grunt) {      
   grunt.initConfig({
      precompileTags: {
         src: ['tags/**/*.html'],
         dest: 'precompiled-tags.js',
         indexByTagName: false
      }
   });
   
   grunt.loadNpmTasks('grunt-riotts-precompile');
   
   grunt.registerTask('default', ['precompileTags']);  
   grunt.registerTask('off', ['precompileTags:off']);
};

How to run the task according to the above Gruntfiles.js:

from the command line, use grunt to create the precompiled file (precompiled-tags.js)
use grunt off to turn off precompilation (will empty precompiled-tags.js)

The generate precompiled-tags.js file can be inlined with a <script> tag just before loading the element's code, e.g.:

   <script type="text/javascript" src="precompiled-tags.js"></script>
   <script type="text/javascript" src="elements/mytag.js"></script>

Precompiled tags can be easily turned off by just commenting the inclusion:

   <!-- <script type="text/javascript" src="precompiled-tags.js"></script> -->
   <script type="text/javascript" src="elements/mytag.js"></script>

or by just emptying the file precompiled-tags.js.

The `indexByTagName` option:

If indexByTagName is set to true compiled tags will be indexed by tagname rather than file path. So it will be possible to define them in RiotTS with just

@template("mytag")

instead of:

@template("mytagdirectory/mytag.html")

Note: Tags defined by tag name rather than path cannot work if precompiled tags are turned off.

Contributing

Contributions are welcome.

If you find bugs or want to improve it, just send a pull request.

Change log

v1.0.7
- BREAKING CHANGE: ship as npm package (bower is no longer supported). The way files are loaded is changed please check again the docs. @template is now available as @Riot.template.
v0.0.22
- removed the need for registration, .register and .registerAll are now removed from the API
v0.0.21
- aligned router API to riot v2.3.11
v0.0.19
- support for precompiled tags
- deprecated support for "template-cache" in favor of precompiled tags
v0.0.18
- aligned with Riot's v2.3.11 API
- for old Riot v2.2, use RiotTS v0.0.17
v0.0.17
- support for template-cache
v0.0.16
- added Riot.registerAll()
v0.0.15
- support for riot builtin mixins
v0.0.11
- support for property getter/setter
v0.0.8
- new @template syntax, @component syntax obsolete
v0.0.6
- deprecated loading templates from named tags
v0.0.5
- addded method createElement()
v0.0.0 to v0.0.4
- early experimental versions

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