![liveview elixir liveview elixir](https://lessandro.herokuapp.com/static/imgs/dixord-2.png)
Pretty useful to documented as it’s pretty easy to implement and Iĭidn’t find anything similar online. Numerous attempts at dealing with that issue and I found it would be
![liveview elixir liveview elixir](https://elixirforum.com/uploads/default/original/3X/9/9/9928362f57572da54d403b806eff02d9e42af568.png)
While I didn’t end up needing that method, I found this trick during my This gives pretty useful informations that can allow to hook to LiveView The first thing I thought about was to use LiveView hooks as documented Only then (to avoid the quick text flash mentioned earlier). Submission was completed so that I can make sure to reset the To deal with this, I wanted a way to tell from JavaScript when the form Is great, except it leaves us with the open even if the
LIVEVIEW ELIXIR UPDATE
The input state didn’t change, it doesn’t need to update the DOM. If we just added a bunch of spaces to the existing text and the backendĭecides to trim the value, Phoenix is smart enough to notice that since Phoenix resets the DOM to the and everything is good, but In the happy path where the form submission triggers a DOM update Processed by the backend and the DOM is updated, which causes a quick I don’t want to reset the state back to the on submission,īecause it would temporarily show the old text until the update is Submitted, it triggers a Phoenix event that might or might not update For reactivity, this is done in JavaScript. To give the context, I have a that is transformed to a
![liveview elixir liveview elixir](https://assets.dockyard.com/images/Phoenix%20LiveView%20Uploads%20(1).png)
Processed by the backend even if that event didn’t trigger a DOM Typically, I wanted to know when a form was done being submitted and Intercept some events from the LiveSocket to take specific action in The search component’s template uses the query and value attributes of the assignment to ensure that the correct radio button is selected and that the search form input is correctly populated with a value if one is present.Recently, I was dealing with a Phoenix LiveView where I wanted to Let’s take a look at the component’s template now in order to understand how it uses the information in the search form’s state to render appropriately. The MessageLive.SearchComponent‘s template renders with the assignment, correctly rendering the search form to reflect any selected search query type and input. The MessageLive.Index‘s template calls live_component/3, passing through the assignment The MessageLive.Index live view’s template renders with the assignment render ( RailwayUiWeb.MessageView, "index.html", assigns ) end def mount ( _session, socket ) do socket = socket |> assign ( :page, 1 ) |> assign ( :search, % Search end Our live view module responds to search form events and maintains the state of the search form, handles the search form submission and renders the template with various search and pagination params.Ī simplified version of our live view looks something like this: defmodule do def render ( assigns ) do Phoenix.View. We’re using LiveView to enact the search functionality, pagination and maintain which messages are currently being displayed in state. Our app persists these messages in the DB and exposes a UI for users to list and search such persisted messages. Let’s say we have an application that uses a message broker like RabbitMQ to publish and consume messages between systems.
LIVEVIEW ELIXIR CODE
Let’s take a look at how we can use components to refactor some complicated LiveView code in an existing application. This makes components a great way to peel off responsibilities from an overly complex live view. While stateless components don’t do much more than render a particular leex template, stateful components implement a handle_event/3 function that allow us to update the component’s own state. Since they share a process with their parent live view, communication between the two is simple (more on that later).Ĭomponents can be stateless or stateful. –– docsĬomponents are run inside a parent live view process via a call to _component/3. …a mechanism to compartmentalize state, markup, and events in LiveView. One way to achieve this goal is to leverage the Phoenix.LiveComponent behaviour.Ĭomponents are modules that use the Phoenix.LiveComponent behaviour. How can we write live views that are easy to reason about and maintain while adhering to common design principles like SRP? If we’re not careful, this can lead to “fat controller syndrome”––live views that are jam packed with complex business logic and disparate responsibilities, just like the classic “fat Rails controller”. As LiveView becomes a more established technology, we naturally find ourselves using it to back more and more complex features.