This makes your JavaScript hook functions available globally from anywhere in your Alpine code. You can call hook code directly by attaching your hook to window. (Note that, Alpine components can also communicate with each other using custom events.) Calling Hook code # Alpine code can call hook functions directly or communicate using JavaScript custom events. Integrating Alpine Components with LiveView via Hooks #Īlpine code can interact with your LiveViews by proxy via hooks. The LiveView’s markup will be variations on: Hooks are created in, or imported into, your app.js file. We attach our hook to a DOM node by assigning the hook name to a ‘phx-hook` attribute in our LiveView markup. This gives us the opportunity to prompt the user if they have unsaved changes and blocks the unload if the user decides to stay. ![]() The BeforeUnload hook registers a beforeunload JavaScript event handler on mount that will be called when the page is about to be unloaded. The documentation is pretty self-explanatory, so we won’t spend much time on hooks here, but let’s take a look at a couple of examples from an app I am developing. This can be used to signal the hook to take some action. A common pattern is to associate a LiveView assign with an attribute on the DOM node, such that every time the assign is updated, the hook’s updated function will be called. The updated callback is called anytime the DOM element it is associated with changes. It is often used to initialize state and register event handlers. The mount callback is called when the element associated with the hook is initially mounted in the DOM, it is a constructor of sorts. The most commonly used lifecycle callbacks are mount and updated. The hook has access to the DOM element on which it is registered, the view name, and functions to push events to the server LiveView or Stateful LiveComponents.Ī hook is a full-blown JavaScript object, meaning that, beyond the hook callbacks, it can have its own state and methods. The hooks get called when the node is mounted, about to be updated, updated, about to be destroyed, destroyed, disconnected, and reconnected. LiveView JavaScript hooks allow us to register JavaScript lifecycle callbacks on DOM nodes, including script, template and hidden elements. If you are just getting started with LiveView, I would recommend the LiveView courses from Grox.io and Pragmatic Studio. We are going to assume you have some LiveView experience. In a follow on article, we will walk through the implementation of a modal using LiveView, AlpineJS, and Tailwind CSS. ![]() In this article, we will go through a set of simple contrived examples so we can focus on the mechanisms involved. Our tools will be LiveView’s JavaScript hooks, AlpineJS and Spruce. ![]() We will discuss how LiveViews and LiveComponents can communicate with JavaScript code and vice versa. Where LiveView and JavaScript meet is what this article is about. Where JavaScript shines is in providing quick response to client actions that don’t require a server roundtrip to perform and in transitions, such as opening a dropdown with a nice animation from the closed to open state and back. And that makes sense, as this is exactly what JavaScript was created to do. But, even so, you will still need to write a smattering of JavaScript if you want your app to have the fit and finish of a finely crafted web app. You can create dynamic server-rendered apps all in Elixir without having to write a large portion of your app in JavaScript frameworks such as React, Angular, or Vue.js. ![]() JIntegrating Phoenix LiveView with JavaScript and AlpineJSĪ common pitch for Phoenix LiveView is it allows you to create modern reactive apps without having to write JavaScript.
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