With the module defined and properly imported, let’s change our “” function to use the new input functions. If we want our input function to be automatically available in all views, we need to explicitly add it to the list of imports in the “def view” section of our “lib/my_app_web.ex” file: import import YourApp.ErrorHelpers import YourApp.InputHelpers # Let's add this one import YourApp.Gettext We will rely on those functions to build the markup later on. Note we used Phoenix.HTML at the top of the module to import the functions from the Phoenix.HTML project. Let’s define it: defmodule YourApp.InputHelpers do use Phoenix.HTML def input ( form, field ) do "Not yet implemented" end end Our input function will be defined in a module named YourApp.InputHelpers (where YourApp is the name of your application) which we will place in a new file at “web/views/input_helpers.ex”. Now that we have set up the codebase, we are ready to implement the input function. Open up “web/models/user.ex” and let’s add a couple new validations at the end of the changeset function: |> validate_length ( :address, min : 3 ) |> validate_number ( :number_of_children, greater_than_or_equal_to : 0 )Īlso, before we do any changes to our form, let’s start the server with mix rver and access to see the default form at work. Therefore, if we want to automatically show validations in our forms, the first step is to declare those validations in our changeset. Still in the “” template, we can see that a Phoenix form operates on Ecto changesets: % > The goal is to replace each group above by a single line. The goal is to build this foundation in our own applications in very few lines of code, without 3rd party dependencies, allowing us to customize and extend it as desired as our application changes.īefore building our input helper, let’s first generate a new resource which we will use as a template for experimentation (if you don’t have a Phoenix application handy, run mix phoenix.new your_app before the command below): mix User users name address date_of_birth:datetime number_of_children:integer notifications_enabled:booleanįollow the instructions after the command above runs and then open the form template at “web/templates/user/”. We aim to support the following API in our templates: Įach generated input will have the proper markup and classes (we will use Bootstrap in this example), include the proper HTML attributes, such as required for required fields and validations, and show any input error. Today we will learn how to build forms in Phoenix that use our schema information to dynamically show the proper input fields with validations, errors and so on.
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