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Developed dev JS docs a bit further

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# JavaScript Components
This document details the format for JavaScript components in BookStack. This is a really simple class-based setup with a few helpers provided.
#### Defining a Component in JS
```js
class Dropdown {
setup() {
this.toggle = this.$refs.toggle;
this.menu = this.$refs.menu;
this.speed = parseInt(this.$opts.speed);
}
}
```
All usage of $refs, $manyRefs and $opts should be done at the top of the `setup` function so any requirements can be easily seen.
#### Using a Component in HTML
A component is used like so:
```html
<div component="dropdown"></div>
<!-- or, for multiple -->
<div components="dropdown image-picker"></div>
```
The names will be parsed and new component instance will be created if a matching name is found in the `components/index.js` componentMapping.
#### Element References
Within a component you'll often need to refer to other element instances. This can be done like so:
```html
<div component="dropdown">
<span refs="dropdown@toggle othercomponent@handle">View more</span>
</div>
```
You can then access the span element as `this.$refs.toggle` in your component.
#### Component Options
```html
<div component="dropdown"
option:dropdown:delay="500"
option:dropdown:show>
</div>
```
Will result with `this.$opts` being:
```json
{
"delay": "500",
"show": ""
}
```
#### Global Helpers
There are various global helper libraries which can be used in components:
```js
// HTTP service
window.$http.get(url, params);
window.$http.post(url, data);
window.$http.put(url, data);
window.$http.delete(url, data);
window.$http.patch(url, data);
// Global event system
// Emit a global event
window.$events.emit(eventName, eventData);
// Listen to a global event
window.$events.listen(eventName, callback);
// Show a success message
window.$events.success(message);
// Show an error message
window.$events.error(message);
// Show validation errors, if existing, as an error notification
window.$events.showValidationErrors(error);
// Translator
// Take the given plural text and count to decide on what plural option
// to use, Similar to laravel's trans_choice function but instead
// takes the direction directly instead of a translation key.
window.trans_plural(translationString, count, replacements);
// Component System
// Parse and initialise any components from the given root el down.
window.components.init(rootEl);
// Get the first active component of the given name
window.components.first(name);
```

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* [Node.js](https://nodejs.org/en/) v16.0+
## Building CSS & JavaScript Assets
This project uses SASS for CSS development and this is built, along with the JavaScript, using a range of npm scripts. The below npm commands can be used to install the dependencies & run the build tasks:
``` bash

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# BookStack JavaScript Code
BookStack is primarily server-side-rendered, but it uses JavaScript sparingly to drive any required dynamic elements. Most JavaScript is applied via a custom, and very thin, component interface to keep code organised and somewhat reusable.
JavaScript source code can be found in the `resources/js` directory. This gets bundled and transformed by `esbuild`, ending up in the `public/dist` folder for browser use. Read the [Development > "Building CSS & JavaScript Assets"](development.md#building-css-&-javascript-assets) documentation for details on this process.
## Components
This section details the format for JavaScript components in BookStack. This is a really simple class-based setup with a few helpers provided.
### Defining a Component in JS
```js
class Dropdown {
setup() {
this.container = this.$el;
this.menu = this.$refs.menu;
this.toggles = this.$manyRefs.toggle;
this.speed = parseInt(this.$opts.speed);
}
}
```
All usage of $refs, $manyRefs and $opts should be done at the top of the `setup` function so any requirements can be easily seen.
Once defined, the component has to be registered for use. This is done in the `resources/js/components/index.js` file. You'll need to import the component class then add it to `componentMapping` object, following the pattern of other components.
### Using a Component in HTML
A component is used like so:
```html
<div component="dropdown"></div>
<!-- or, for multiple -->
<div components="dropdown image-picker"></div>
```
The names will be parsed and new component instance will be created if a matching name is found in the `components/index.js` componentMapping.
### Element References
Within a component you'll often need to refer to other element instances. This can be done like so:
```html
<div component="dropdown">
<span refs="dropdown@toggle othercomponent@handle">View more</span>
</div>
```
You can then access the span element as `this.$refs.toggle` in your component.
Multiple elements of the same reference name can be accessed via a `this.$manyRefs` property within your component. For example, all the buttons in the below example could be accessed via `this.$manyRefs.buttons`.
```html
<div component="list">
<button refs="list@button">Click here</button>
<button refs="list@button">No, Click here</button>
<button refs="list@button">This button is better</button>
</div>
```
### Component Options
```html
<div component="dropdown"
option:dropdown:delay="500"
option:dropdown:show>
</div>
```
Will result with `this.$opts` being:
```json
{
"delay": "500",
"show": ""
}
```
#### Component Properties
A component has the below shown properties available for use. As mentioned above, most of these should be used within the `setup()` function to make the requirements/dependencies of the component clear.
```javascript
// The root element that the compontent has been applied to.
this.$el
// A map of defined element references within the compontent.
// See "Element References" above.
this.$refs
// A map of defined multi-element references within the compontent.
// See "Element References" above.
this.$manyRefs
// Options defined for the compontent.
this.$opts
```
## Global JavaScript Helpers
There are various global helper libraries in BookStack which can be accessed via the `window`. The below provides an overview of what's available.
```js
// HTTP service
window.$http.get(url, params);
window.$http.post(url, data);
window.$http.put(url, data);
window.$http.delete(url, data);
window.$http.patch(url, data);
// Global event system
// Emit a global event
window.$events.emit(eventName, eventData);
// Listen to a global event
window.$events.listen(eventName, callback);
// Show a success message
window.$events.success(message);
// Show an error message
window.$events.error(message);
// Show validation errors, if existing, as an error notification
window.$events.showValidationErrors(error);
// Translator
// Take the given plural text and count to decide on what plural option
// to use, Similar to laravel's trans_choice function but instead
// takes the direction directly instead of a translation key.
window.trans_plural(translationString, count, replacements);
// Component System
// Parse and initialise any components from the given root el down.
window.components.init(rootEl);
// Get the first active component of the given name
window.components.first(name);
```