Updated some comment elements and standardised more JS

- Updated comment routes to be simpler.
- Updated comments JS to align better with updated component system.
- Documented available global JS functions/services.
- Removed redundant controller method.
- Added window.$events helpers for validation messages and
success/error.
- Updated JS events system to not be class based for simplicity.
- Added window.trans_plural method to handle pluralisation/replacements
where you already have the translation string itself.

Fixes #1836

2020-07-28 18:19:18 +01:00

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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

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:

<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:

<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

<div component="dropdown"
    option:dropdown:delay="500"
    option:dropdown:show>
</div>

Will result with this.$opts being:

{
    "delay": "500",
    "show": ""  
}

Global Helpers

There are various global helper libraries which can be used in components:

// 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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