Phoenix.Html.Form Question. How to use "array names" for example name[] for input name

Phoenix Forum Questions / Help
1

Hello,

I got a little question here.
In Html we sometimes we append ‘[]’ to the input names in form, as an example below.

<input name="input1[]" type="text" />
<input name="input1[]" type="text" />
<input name="input1[]" type="text" /> 
...

My questions are -
First - In General, how do phoenix handle these kind of inputs? Do phoenix converts to them tuple type on the fly as they are in ordered. Let’s try it out.

Second - How do use Phoenix.Html.Form to generate the tags in the form. I have some think that it should work but it didn’t.
This is what I have tried -

<%= form_for @conn, @action, [as: "purchase"], fn f -> %>
<%= text_input f, :roll %>
<%end %>

The above code resulting in generating below tag -

<input name="purchase[roll[]]" type="text" />

Which isn’t what we want?

Dev.

3 Likes
2

With this code

<input name="input1[]" type="text" value="1" />
<input name="input1[]" type="text" value="2" />
<input name="input1[]" type="text" value="3" />

We are getting this as elixir list and in the order of first come in the form first we can extract from the list. I really like this.

[“1”,“2”,“3”]

But still couldn’t figure out how to use the Phoenix.Html.Form to generate html for this.

Dev.

3

Pass the name option to the functions, for example: text_input f, :input1, name: "input1[]". Not sure if that’s exactly the option but it something along the lines above.

10 Likes
4

Thank you very much Jose Valim.

–
Dev.

5

For anyone that arrives here via google and is looking to see how to add an array field within a model you can use

<%= text_input f, :input1, name: "game[player_names][]" %>

So that will add a player_name array within the game_params in your controller.

9 Likes