Sviluppare Plugin per Discourse - Parte 2 - Connessione a un outlet del plugin

[Discourse]

Tutorial precedente: Developing Discourse Plugins - Part 1 - Create a basic plugin

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Introduzione: Template Handlebars

L’applicazione client di Discourse è scritta utilizzando il framework Javascript Ember.js. Ember utilizza Handlebars per tutti i template HTML. C’è un’ottima introduzione al linguaggio di templating a quel link, quindi leggetelo attentamente.

Il Problema: Aggiungere elementi all’interfaccia utente di Discourse

Molti plugin devono aggiungere ed estendere l’interfaccia web di Discourse. Forniamo un meccanismo per farlo chiamato plugin outlet nei template Handlebars.

Se sfogliate i template Handlebars di Discourse, vedrete spesso il seguente markup:

<PluginOutlet @name="edit-topic" />

Questo dichiara un plugin outlet chiamato “edit-topic”. È un punto di estensione nel template che gli autori di plugin possono sfruttare per aggiungere il proprio markup Handlebars.

Quando scrivete il vostro plugin, cercate nei template Handlebars di Discourse (nei file .hbs) che volete modificare un <PluginOutlet />. Se non ce n’è uno, chiedetecelo per aggiungerlo! Saremo lieti di aggiungerli se avete un buon caso d’uso. Se volete rendere più facile e veloce per noi farlo, inviate una pull request su github!

Se volete vedere alcuni dei punti in cui esistono i plugin outlet, potete eseguire il seguente comando se siete su OSX o Linux:

git grep "<PluginOutlet" -- "*.hbs"

Potete anche visualizzare i plugin outlet su un sito Discourse attivando la Discourse Developer Toolbar. Digitate enableDevTools() nella console del browser su un forum Discourse e cliccate sull’icona a forma di spina che appare sul lato sinistro della pagina.

Connessione a un Plugin Outlet

Una volta trovato il plugin outlet che volete estendere, dovete scrivere un connector per esso. Un connettore è in realtà solo un template Handlebars il cui nome del file include connectors/<nome outlet> al suo interno.

Ad esempio, se il template Handlebars di Discourse ha:

<PluginOutlet @name="evil-trout" />

Allora qualsiasi file Handlebars che create nella directory connectors/evil-trout verrà automaticamente aggiunto. Quindi, se avete creato il file:

plugins/hello/assets/javascripts/discourse/connectors/evil-trout/hello.hbs

Con il contenuto:

<b>Hello World</b>

Discourse inserirà <b>Hello World</b> in quel punto del template.

Notate che abbiamo chiamato il file hello.hbs – L’ultima parte del nome del file non è importante, ma deve essere unica per ogni plugin. È utile nominarlo qualcosa che descriva ciò che state estendendo. Questo renderà il debug più facile in futuro.

Risoluzione dei problemi

• Ricontrollate il nome del connettore e assicuratevi che corrisponda perfettamente al nome del plugin.

Maggiori informazioni

Using Plugin Outlet Connectors from a Theme or Plugin

Discourse includes hundreds of Plugin Outlets which can be used to inject new content or replace existing contend in the Discourse UI. ‘Outlet arguments’ are made available so that content can be customized based on the context. Choosing an outlet To find the name of a plugin outlet, search Discourse core for “<PluginOutlet”, or use the plugin outlet locations theme component. (e.g. topic-above-posts). Wrapper outlets Some outlets in core look like <PluginOutlet @name="foo" />. These allow you…

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Altro nella serie

Parte 1: Basi dei Plugin
Parte 2: Questo argomento
Parte 3: Impostazioni del Sito
Parte 4: Configurazione git
Parte 5: Interfacce di Amministrazione
Parte 6: Test di Accettazione
Parte 7: Pubblica il tuo plugin

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Questo documento è controllato tramite versione - suggerisci modifiche su github.

[kennym (Kenny Meyer)]

Is there a list of plugin outlets?

More specifically I would like to know if one could modify the “create topic” template?

[cpradio]

@kennym

More specifically I would like to know if one could modify the “create topic” template?

In what way? Add new fields to the composer area (like the tagging plugin does)?

[kennym (Kenny Meyer)]

Yes, that’s what I am searching for.

[eviltrout (Robin Ward)]

I’d take a look at the tagging plugin then. It might have all you want!

[Andrew_Byrne]

@eviltrout is there a way to output directly to JSON.
basically creating a new API endpoint?

[Andrew_Byrne]

Ahhhhhhhh. new to this whole “ruby fad”
I have a partial solution that i’ll detail in:

Multiple topics in single API request

Using the Discourse API is pretty cool and I’ve used it to provide a number of custom interrogations in related sites. One thing that has caused me some issues is the fact I need to make single requests on each topic via: GET discourse.foo/t/topicID/1234.json for most Discourse systems this is cool but I am blending results, ie requesting multiple topics and adding them to a single post feed. when the number increases the requests become… annoying. I’m looking for a solution something along t…

[andrewroth]

Hi Robin,

The plugin-outlet-locations plugin seems to declare all the connectors with a register_asset line in plugin.rb. Starting here: discourse-plugin-outlet-locations/plugin.rb at master · Mittineague/discourse-plugin-outlet-locations · GitHub

Is that a necessary step?

[eviltrout (Robin Ward)]

Nope - that’s not necessary. All .es6 and .hbs files are loaded automatically in plugins.

[kourou (Ilias)]

I am still trying to figure out how plugins in Discourse work and I could use a little help.

I would like to modify the timeline scroll bar (in the right side of each topic). Actually, what I need to do is add some stuff (image/banner) below the scroll bar.
What template should I edit? Is there an existing plugin-outlet for that?

Thank you,
Ilias

[1c7 (Cheng Zheng)]

2018-4-28 work for me!

1. Plugin Outlet name

2. Code

3. Result

[sarahann (Sarah)]

This guide is great! I had my plugin showing in the /admin/plugins quite easily.

I was wondering though, how do you delete items from a template?

For privacy reasons, I wanted to delete the export to csv button in the /admin/users/list/active as well as the show emails button. But I didn’t find a plugin outlet connector for those parts of the UI.

I was trying to overwrite the following templates

/users-list-show.hbs
/users-list.hbs

with my plugin outlet.

But creating these files
/var/www/discourse/plugins/[my-plugin]/assets/javascripts/admin/templates/users-list-show.hbs
/var/www/discourse/plugins/[my-plugin]/assets/javascripts/admin/templates/users-list.hbs
and making changes to them didnt seem to work. Even after deleting the /var/www/discourse/tmp folder and restarting the server.

Is this the correct way to delete those buttons from the UI? Using css display: none; isn’t an option.

I feel like I am missing something really simple, any ideas?

[merefield (Robert)]

@sarahann

For privacy reasons, I wanted to delete the export to csv button in the /admin/users/list/active as well as the show emails button.

Not a direct technical answer to your question but why would you want to do that?

Only the admins can do this. They usually have full control of the server most likely anyway and could read the database, so hiding a button is a bit futile: emails will also show up in the Email logs and on your mail service logs. I’m afraid site admins are going to see a lot of email addresses!

Admins have full control, they see everything (except passwords presumably), so this is normal.

If you are an admin, get used to the responsibility which comes with knowing all of this!

[sarahann (Sarah)]

My concern was that moderators can access some things in the admin dashboard.
They can navigate to the ‘users’ tab and see the Export and the Show Emails buttons

We don’t want our moderators to be able to grab bulk emails like this.
I understand that the emails are visible on users profiles, but we didn’t want an easy way to get this information.

So I was trying to create a plugin that hides these buttons.

[merefield (Robert)]

Could be wrong, but this suggests it’s not an issue … have you Impersonated a Mod?

[sarahann (Sarah)]

Yes, the screenshot I took was from impersonating a mod.

We have a similar setup as the link you provided (Moderators ability to see emails inconsistent).

I’m not requesting the Discourse team makes any changes though, this isn’t an issue with Discourse.

I am trying customize Discourse for our situation. I was hoping that using a plugin outlet and referencing the files within that plugin was the right way to overwrite a template in Discourse. I just wasn’t able to successfully overwrite these files:

/users-list-show.hbs
/users-list.hbs

My changes never showed up. So I thought this plugin outlet topic could help

[merefield (Robert)]

Perhaps someone else can chime in, but I’ve always seen Outlets as additive. You may need an override technique instead (via javascript/Ember). I’m still learning this myself :).

[Mittineague]

I’m thinking that if overriding a template is the goal that it might be better to do this with a theme instead of a plugin.

[sarahann (Sarah)]

I was thinking that as well, but I didn’t want a user to swap their theme and be able to get different functionality. So I figured a plugin outlet would do the trick

[pfaffman (Jay Pfaffman)]

I think you can probably hide those with CSS.