wire-validation v0.1.4
Premise
The purpose of this plugin is to make Livewire validation results easily accessible through AlpineJs.
Livewire compatibility
This package is compatible with Livewire v2 and v3. It has not been tested on v1.
Installation
CDN
Include the following <script> tag in the <head> of your application layout. The script tag must be added before the Alpine scripts.
<script defer src="https://cdn.jsdelivr.net/npm/wire-validation@latest/dist/wire-validation.min.js"></script>See Alpine installation instructions for more info.
NPM
You can install the plugin from NPM with the following command:
npm install wire-validationThen initialize it in your application along with any other Alpine plugins:
import Alpine from 'alpinejs';
import ValidationErrors from 'wire-validation';
Alpine.plugin(ValidationErrors);
Alpine.start();Usage
There are two strategies that can be used to access and display the validation errors: either through a global error store or on a component-by-component basis.
Adding the x-wire-errors directive to the root element of your Livewire component will grant you access to your component's validation errors with the following helpers:
Checking for any validation errors
You can check your component for validation errors by using the hasErrors() helper. This helper returns a bool. If no wire model name is passed to the helper, the component will be checked for ANY errors.
<form id="my-livewire-component" x-data x-wire-errors>
<label>
<span>Name</span>
<input type="text" wire:model="name" />
</label>
<!-- This will only show when some error exists on the component -->
<div x-show="hasErrors()" class="error-text">
There is some error on your form!
</div>
<button type="submit">Save</button>
</form>When the form is submitted with an error, the message shows up! No need to mess around with any blade directives. What if you wanted to check for a specific error though?
Checking specific fields
hasErrors() also accepts a string parameter where you can specify the specific wire:model to check against:
hasErrors('some.model')The error checking supports dot notation and wildcards as well!
Example
Using the same example from above, we will add another input field bound to the Livewire property age.
<style>
/* set a fat red border with red text */
.form-error {
border: 4px solid #FF0000;
color: #FF0000;
}
</style>
<form id="my-livewire-component" x-data x-wire-errors>
<label>
<span>Name</span>
<input type="text" wire:model="name" :class="{'form-error': hasErrors('name')}" />
</label>
<label>
<span>Age</span>
<input type="text" wire:model="age" :class="{'form-error': hasErrors('age')}" />
</label>
<button type="submit">Save</button>
</form>As you can see, we use Alpine's class binding to add the form-error class when our input field has an error. The class will only be bound when an error for the specified wire:model is present.
This is all fine, but at some point you'll probably want to display the error message to the user.
Displaying errors
To display the error messages using AlpineJs, you'll need to use the errorsFor() helper which returns an array of error strings. Like hasErrors(), this helper accepts an optional string parameter which can be used to select the errors from specific fields (wildcard support here too!). Calling errorsFor() with no parameter will return all errors for the component in an array.
Example
Continuing off the example from above, we can add error messages below the input fields. I'm going to scope in on just the name part of the form for sanity's sake.
<label>
<span>Name</span>
<input type="text" wire:model="name" :class="{'form-error': hasErrors('name')}" />
<!-- Loop through any error messages and display them -->
<div x-for="(message, index) in errorsFor('name')"
:key="index"
class="form-error"
x-text="message"
></div>
</label>We use the Alpine's x-for directive directive to loop through the error messages and display them. But what if you just want to show one error at a time?
Displaying only the first error
We can use the firstErrorFor() helper which follows has all of the same features as the previous helpers (empty string, wildcard, filter by model...). This helper returns a string for the specified component or field.
Example
We can modify the example above to show only the first error for the name field
<label>
<span>Name</span>
<input type="text" wire:model="name" :class="{'form-error': hasErrors('name')}" />
<!-- Display only the first error -->
<div x-show="hasErrors('name')" x-text="firstErrorFor('name')"></div>
</label>Accessing other component's error state
If you wanted to reach over to another x-wire-errors Livewire component you can use the magic directive $componentErrors(elementId, wireModel).
The first parameter is an HTML element id and the second optional parameter is the desired wire model filter (same rules apply - emtpy, wildcard, etc).
You can leverage this to quickly check on another component when your Livewire component depends on another's error state.
License
Licensed under the MIT license, see LICENSE for details.