163 lines
2.2 KiB
Markdown
163 lines
2.2 KiB
Markdown
---
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title: Riot.js
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category: JavaScript libraries
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---
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### About
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{: .-intro}
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Riot is a UI library for JavaScript.
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- <https://riot.js.org/>
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### Tags
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```js
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/* tag-name.tag */
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<tag-name>
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<div>
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hello {name}
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</div>
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this.name = opts.name
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</tag-name>
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```
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```html
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<!-- in html -->
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<tag-name>
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<script>riot.mount('*')</script>
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<script>riot.mount('tag-name')</script>
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<script>riot.mount('tag-name', { title: 'my app', ... })</script>
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```
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### Expressions
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```
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{value}
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{value || 'its a js expression'}
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<input checked={null}> /* null values ignore the tag */
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<p class={ selected: true }>
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```
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### Loops
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```
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<li each={movies}>{title}</li>
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```
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### Conditional
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```
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<div if={error}>
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<div show={error}> /* show using display: '' */
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<div hide={error}> /* hide using display: none */
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```
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### Events
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```js
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<button onclick={go}>
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this.go = function (e) { ... }
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```
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## API
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```js
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this.update()
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this.update({ data: 'hi' }
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this.unmount()
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this.unmount(true) // keep parent tag
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riot.update() // update all
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```
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## Nesting
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### Nesting
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```
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<my-tag>
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<child></child>
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var child = this.tags.child
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</my-tag>
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```
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### Names
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```
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<my-tag>
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<child name='xyz'></child>
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var child = this.tags.xyz
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</my-tag>
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```
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## Nested HTML
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### Yield
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```js
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<yield/>
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```
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### Yield to/from
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```js
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<post>
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<yield to='title'>Hello</yield>
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<yield to='body'>Hey there world</yield>
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</post>
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```
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```js
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<post>
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<yield from='title'/>
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<yield from='body'/>
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</post>
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```
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## Router
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```js
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riot.route('customers/*/edit', (id) => {
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})
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riot.route('customers/234/edit')
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riot.route.start()
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riot.route.start(true) // exec the current url
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```
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## Lifecycle
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```js
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this.on('before-mount', function() {
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// before the tag is mounted
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})
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this.on('mount', function() {
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// right after the tag is mounted on the page
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})
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this.on('update', function() {
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// allows recalculation of context data before the update
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})
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this.on('updated', function() {
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// right after the tag template is updated
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})
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this.on('before-unmount', function() {
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// before the tag is removed
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})
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this.on('unmount', function() {
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// when the tag is removed from the page
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})
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// curious about all events ?
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this.on('all', function(eventName) {
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console.info(eventName)
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})
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```
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