mrmurphy

mrmurphy

How exactly does phx-update detect changes?

I’ve run into a situation where I’ve got a list of posts inside of a container that uses phx-update=“prepend”, and the posts on the socket are temporary assigns. Inside of the “for” comprehension, I want to render data not only from the post, but from another assign on the socket.

When the post changes, my DOM updates render, but when the other assign I’m using (pending_loves, in the image) changes, I don’t get any DOM updates. I’m guessing this is because live view is doing some magic change tracking around the for comprehension specifically? What’s the most idiomatic way to inform Live View that I want the content inside of the for to update when a different assign changes as well?

Most Liked

mrmurphy

mrmurphy

Thanks! Victor Mono:

dimitarvp

dimitarvp

Thank you! Instant switch in my terminal programs. Can’t believe I missed it even though I have it in my library.

Previously used InconsolataGo but Victor Mono is definitely better. :slight_smile:

mrmurphy

mrmurphy

I thought maybe if I included the pending_loves assign on the right-hand side of the for comprehension, the change would be picked up and re-rendered. But no dice:

  <div id="posts" class="max-w-lg mx-auto dark:bg-gray-800" phx-update="prepend">
    <%= for {post, pending_loves} <- (@posts|>Enum.map(&({&1, get_pending_loves(@pending_loves, &1.id)}))) do %>
    <div id="<%= post.id %>">

Even with this change, when I update the assign @pending_loves, the count of pending loves does not update on the page inside of the for comprehension until the post object is updated. It does update if placed outside of the comprehension, though, even inside of the phx-update="prepend" container.

Where Next?

Popular Backend topics Top

jaimeiniesta
I maintain a project that lists hundreds of thousands of web pages, and I’d like to show a screenshot for each web page. There are alread...
New
andrea
Can Phoenix LiveView be used in multi-page applications, unlike React/Vue/Blazor which seems to be targeted for SPA?
New
Jsdr3398
I’ve been working on and rewriting my messaging platform several times for the past two years. With Discords new rebranding, it has reall...
New
Fl4m3Ph03n1x
Background I am trying to find a cheap and easy way to create New Types in Elixir, and Records seem to be just what I would need. Probl...
New
Fl4m3Ph03n1x
Background So, I am playing around with a concept named “NewType” and I am taking inspiration from languages like F# and Scala. My objec...
New
Fl4m3Ph03n1x
Background I have a personal project that is an elixir desktop application for PC Windows. It works pretty well, but now I want to give i...
New
Manish_bose
Can anyone help me how to convert a long data to wide data in SQL without using hard coding? Regards Manish
New
Fl4m3Ph03n1x
Background I am a fan of dialyzer and friends (looking at Gradient) and I try to have sepcs in my code as much as I can. To this end, I a...
New
Sumityadav
Hello all, I am new to learning Java Programming and want to learn java from scratch. I was writing a Java program to get the first and l...
New
Fl4m3Ph03n1x
Background As I often do, I read books to learn and improve myself. I also enjoy teaching and helping others when I can, so this is somet...
New

Other popular topics Top

PragmaticBookshelf
Ruby, Io, Prolog, Scala, Erlang, Clojure, Haskell. With Seven Languages in Seven Weeks, by Bruce A. Tate, you’ll go beyond the syntax—and...
New
AstonJ
Or looking forward to? :nerd_face:
485 12328 258
New
AstonJ
Thanks to @foxtrottwist’s and @Tomas’s posts in this thread: Poll: Which code editor do you use? I bought Onivim! :nerd_face: https://on...
New
AstonJ
Just done a fresh install of macOS Big Sur and on installing Erlang I am getting: asdf install erlang 23.1.2 Configure failed. checking ...
New
AstonJ
I have seen the keycaps I want - they are due for a group-buy this week but won’t be delivered until October next year!!! :rofl: The Ser...
New
Exadra37
I am asking for any distro that only has the bare-bones to be able to get a shell in the server and then just install the packages as we ...
New
DevotionGeo
The V Programming Language Simple language for building maintainable programs V is already mentioned couple of times in the forum, but I...
New
AstonJ
Biggest jackpot ever apparently! :upside_down_face: I don’t (usually) gamble/play the lottery, but working on a program to predict the...
New
PragmaticBookshelf
Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...
New
AstonJ
This is a very quick guide, you just need to: Download LM Studio: https://lmstudio.ai/ Click on search Type DeepSeek, then select the o...
New