He creado un tema más elaborado para user-card-contents, añadiendo algunos campos de usuario personalizados. Me gustaría hacer que la tarjeta sea fija, con un botón de cierre, de manera similar al componente “Crear un nuevo tema”.
¿Tengo razón al pensar que tendré que sobrescribir user-card-contents.js para evitar la llamada que cierra el elemento? ¿Podría empaquetar esto dentro del tema?
¡Gracias!
¡Hola, Pete! Bienvenido a Meta 
La respuesta corta es sí. Si tus cambios solo afectan al front-end, entonces se pueden realizar en un tema o componente.
¿Podrías detallar a qué te refieres con “fijo”? Si te refieres a que quieres que se desplace junto con el contenido manteniéndose en la misma posición, eso sería un cambio de CSS. Además, ¿se pretende que el cambio esté incluido tanto en escritorio como en móvil?
¿Podrías describir específicamente a qué llamada te refieres? (por ejemplo, al hacer clic, al desplazarse, etc.)
El marcado para el botón de cerrar tendría que añadirse a la plantilla Handlebars de la tarjeta de usuario. La lógica para manejar la acción cuando se hace clic en el botón tendría que añadirse al archivo .js del componente.
Es posible que no sea necesaria una sobrescritura completa; hay algunos ganchos (hooks) que puedes usar para sobrescribir métodos específicos en una clase. Puedo compartir más información sobre eso si describes un poco más lo que quieres hacer.
¡Gracias por la bienvenida, Joe!
Lo que busco hacer es evitar que el controlador de eventos clickOutsideEventName del mixin card-contents-base.js cierre la tarjeta en escritorio. En su lugar, me gustaría obligar a los usuarios a hacer clic en un botón para cerrarla. Probablemente necesite hacer algo diferente para móvil.
Ya logré que funcione esta plantilla de Handlebars, ahora a averiguar lo del archivo .js 
TL;DR I think this is what you’re after
Theme JS
api.modifyClass("component:user-card-contents", {
didInsertElement() {
this._super(...arguments);
$("html").off(this.clickOutsideEventName);
},
actions: {
closeCard() {
this._close();
}
}
});
and then add this to your template somewhere
{{d-button
class="btn-flat"
action=(action "closeCard")
icon="times"
}}
The long version
You probably already know most of this since you’ve already worked on your theme but I will try to keep it a little bit more detailed for the broader audience.
The first thing I’d do is to search either locally or on Github. On Github you’d get something like this. In most cases, a search term will have more than one result and you’d either have to be more specific or manually scan the result to find something close to what you want.
So, now we end up on this file
This file is a Mixin. Why do I mention this? Because you need to be aware that mixins can be shared in a number of different places. In this case, it’s used for both user cards and group cards. So, the changes you make here will affect both.
If you search in the file, you’ll find that clickOutsideEventName is first defined here
then passed on here as a property
and then finally consumed here
Cool, but what does all of that mean? Well if you look at where all of this code is added, you’ll notice that it’s inside didInsertElement
The Ember guides state
Ember guarantees that, by the time
didInsertElement()is called:
- The component’s element has been both created and inserted into the DOM.
- The component’s element is accessible via the component’s
this.elementproperty.
Why do we need this? Because we need a different mousedown handler for user cards and group cards. If we go back a bit, you’ll now notice that the id of the element is used in the clickOutsideEventName
Which like we discussed above is then passed on as a property.
Now, let’s move on to how all of this relates to what you’re doing.
You’re trying to prevent the cards from being closed when the user clicks outside of them. So, let’s try to find out a way to do that. If you recall, we discussed how clickOutsideEventName eventually gets consumed here
In a nutshell this adds a mousedown handler to the HTML element when a card is inserted (on the first page view). We then check the target of the mousedown event. If the target is somewhere in the card, we bail. If it’s outside of the card, we close it by calling this._close()
_close() is defined here
And this is what you’ll need to call when you add your close button - but we’ll get back to that later.
Now, the goal is to remove this mousedown handler if you want clicks outside the card not to close it. So how do we do this? Well, we’ll need to modify didInsertElement() and here’s how that can be done.
Discourse themes have access to the plugin API, which contains many methods that you can use. There’s a bit more details about the most commonly used ones here
If you remember, the file we’re working with is a Mixin. A Mixin is an Ember class. So, the method we’re going to use is modifyClass
When you use modifyClass you can either add, modify or completely override a class method. We’ll focus on modifying a method since that’s what you want to do.
We want to modify didInsertElement() so we can do something like this
api.modifyClass('mixin:card-contents-base', {
didInsertElement() {
console.log("foo");
}
});
and try it out…
well that didn’t work.
why is that? Well it turns out that the modifyClass method doesn’t currently support modifying Mixins (as far as I’ve tested) I will make a note to figure out why that’s the case and check if we can fix that. For now though, let’s get back to what you want to do.
Well, we can’t modify Mixins, so I guess we’re stuck, yeah? No. Let’s dig a little bit deeper.
Like I mentioned before, that Mixin is used by both the user user-card-contents and group-card-contents Ember components (again, because Mixins are designed to make code reusable)
So, let’s look at the user-card-contents component here
If you read carefully, you’ll notice that we first import the Mixin we discussed above here
and then create a new Ember component and pass the Mixin to it.
What does that mean? it means that didInsertElement() for user-card-contents is actually inherited from the Mixin. The same can be said about group-card-contents.
Where does that leave us? Well, there’s good news and bad news. The good news is that if you want to make changes to the user-card-contents without affecting group-card-contents then you can! The bad news is that if you want your changes to apply to both, then you’ll have to duplicate some code.
Let’s go back to modifyClass and try again with user-card-contents. So something like this:
api.modifyClass('component:user-card-contents', {
didInsertElement() {
console.log("foo");
}
});
and see what happens…
voalá 
The change is registered and we can see it in the console, but we’re not quite there yet.
So, now that we can modify didInsertElement(), let’s try to get back to what you’re trying to do. If you remember, the mousedown handler is defined in didInsertElement here
So what can we do about it? Well, it’s a simple as this
$("html").off(clickOutsideEventName)
Will that work though? Nope. If you do this
api.modifyClass('component:user-card-contents', {
didInsertElement() {
$("html").off(clickOutsideEventName)
}
});
You’ll end up with something broken. Why is that? because that’s not a modification of the method. That’s a full override of the core didInsertElement() method for that component. So, none of the code in core is actually applied if you do this.
How do we fix this? Well it turns out that Ember has a thing called this._super(...arguments)
What does that do? it allows you to append or prepend code in addition to what the class method already has. For example, if you do this
api.modifyClass('component:user-card-contents', {
didInsertElement() {
// code you want to add
$("html").off(clickOutsideEventName);
// code from core
this._super(...arguments);
}
});
then the code you want to add will run before anything else here
However, if you do this…
api.modifyClass('component:user-card-contents', {
didInsertElement() {
// code from core
this._super(...arguments);
// code you want to add
$("html").off(clickOutsideEventName);
}
});
then your code will run after everything here runs
This is a great way to keep your theme resilient to changes in core since everything in core runs first, then your code runs after that. So, let’s try this again and see what happens.
api.modifyClass('component:user-card-contents', {
didInsertElement() {
// code from core
this._super(...arguments);
// code you want to add
$("html").off(clickOutsideEventName);
}
});
and…
Why is this happening? it’s because of different code context. In the Ember component file clickOutsideEventName is already defined by the time it’s consumed. Your theme is in a different file, so clickOutsideEventName is not defined there.
How do we fix it? Remember this?
clickOutsideEventName is a property of the component, so if you use this.clickOutsideEventName then it should work. Let’s try that.
api.modifyClass('component:user-card-contents', {
didInsertElement() {
// code from core
this._super(...arguments);
// code you want to add
$("html").off(this.clickOutsideEventName);
},
});
And indeed it works
The user cards now open without any errors and clicking anywhere outside doesn’t do anything.
You can do the exact same thing for group cards like so
api.modifyClass('component:group-card-contents', {
didInsertElement() {
// code from core
this._super(...arguments);
// code you want to add
$("html").off(this.clickOutsideEventName);
},
});
The only thing left is to hookup that close button to the _close() method we discussed earlier and there are three steps to this.
closeCard action (you can name whatever you want)I’ll stick with the user cards for simplicity. So, we add this (along with what we already discussed)
api.modifyClass("component:user-card-contents", {
didInsertElement() {
this._super(...arguments);
$("html").off(this.clickOutsideEventName);
},
// new stuff
actions: {
closeCard() {
this._close();
}
}
});
all that does is that it calls the core _close() method whenever the closeCard custom action is triggered.
Next we need to add a button to the user card template or something like this
{{d-button
class="btn-flat"
action=(action "closeCard")
icon="times"
}}
My rough results look like this
And of course you can do something similar for group cards like I mentioned above.
I’ll leave the group card and mobile implementation as exercise for you since you’d essentially use the exact same concepts we discussed above if you want to make changes to those but please let me know if you run into any problems.
¡Muchas gracias, esto ha resultado en un excelente tutorial! Lo aprecio mucho. No había dado cuenta de la API de complementos.
Una cosa que no era inmediatamente obvia arriba fue envolver los cambios de JS del tema en etiquetas de script y colocarlo en common/head_tag.html del complemento:
<script type="text/discourse-plugin" version="0.2">
</script>
Solo por curiosidad, ¿importa el número de versión en la etiqueta aquí? ¿Y es siempre mejor colocarlos en head_tag.html en lugar de header.html o realmente no importa.
¡Gracias!
@Johani Puedo crear otro hilo para esto si lo prefieres, pero estoy tratando de localizar el controlador user-card del lado del cliente que:
Mi objetivo es eliminar la funcionalidad del segundo clic. ¡Gracias!