![]() modal inside a sigil_H to render it, providing the and assigns in the opening tag: The "modal-footer" div contains two buttons, "Ok" and "Cancel," that for the moment don't do anything. In the div with class "modal-body", will give us the value of The component will expect us to supply it with a map of assigns that include these, when we call it. Within the "header" div, will substitute the value of the assign on render (we could equally well write it it's just longer). This defines a function, called modal/1, that renders an HTML div element with class "modal-container", enclosing more divs for the three distinct parts of our modal: header, body, and footer. Component def modal ( assigns ) do ~H"" " Then we can go ahead and define our function component.ĭefmodule MyAppWeb. We call use Phoenix.Component at the top of our module to import the functions defined in Phoenix.LiveView and. passing a value from the component's assigns map into one of its slots.passing values into the component through a named slot's attributes.dealing gracefully with slots that are not always defined.placing multiple blocks of custom HTML through named slots.displaying custom HTML we insert in its default slot.displaying strings from an assigns map we pass to it.We'll lay some groundwork with a basic function component we'll call modal, and morph it to demonstrate the following powers: When we call the function component, we pass our unique content to it, either through its assigns parameter, or, if we need to pass whole blocks of HTML, using the slots mechanism. It's used not only in defining a template for a component, but also in rendering it. The ~H sigil lets us inject HEEx templating code into our source, to be interpreted and rendered into our LiveView. This is a job for LiveView's function components ( Phoenix.Component).Ī function component is basically a wrapper for a ~H sigil that provides a template for customized content. We'd prefer not to repeat this markup for all possible variations! The Solution For a consistent experience, they might all have HTML elements for header, body, and footer regions. Imagine we're writing a Phoenix LiveView app that frequently uses modals to display or save information. We'd like a way to reuse code for UI components that are very similar in structure, but carry different content. 6 min Share this post on Twitter Share this post on Hacker News Share this post on Reddit Reuse Markup With Function Components and Slots Author Name Berenice Medel Social Media View Twitter Profile Author Name Chris Nicoll Social Media View Twitter Profile Image by Annie Ruygt The Problem.Input editing while an event to the server is in flight. This works wellįor updates where major side effects are not expected, such as form validationĮrrors, or additive UX around the user's input values as they fill out a form.įor these use cases, the phx-change input does not concern itself with disabling Value, even if it deviates from the server's rendered updates. The JavaScript client is always the source of truth for current input values.įor any given input with focus, LiveView will never overwrite the input's current def mount ( _params, _session, socket ) do = params, socket ) do # handle form reset end def handle_event ( "changed", params, socket ) do # handle regular form change end With the form rendered, your LiveView picks up the events in handle_eventĬallbacks, to validate and attempt to save the parameter accordingly: def render ( assigns ). input component with built-in features and styles. If your application was generated with Phoenix v1.7, then mix phx.newĪutomatically imports many ready-to-use function components, such as Here is a simple version to get started with: attr :field, attr :rest, include : ~w(type) def input ( assigns ) do ~H""" Input/1 is a function component for rendering inputs, most oftenĭefined in your own application, often encapsulating labelling,Įrror handling, and more. ![]() We recommend reading its documentation for more details on how it worksĪnd all supported options.form expects a assign, which canīe created from a changeset or user parameters via _form/1. form is the function component defined in /1, Saving, your form would use both phx-change and phx-submit bindings. For example, to handle real-time form validation and Where all form fields are passed to the LiveView's callback given any In general, it is preferred to handle input changes at the form level, To handle form changes and submissions, use the phx-change and phx-submitĮvents.
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