Conditional Validation Example

This is a basic example of how to use conditional validations.

PostController.php

<?php

namespace App\Http\Controllers;

use JsValidator;
use Illuminate\Http\Request;

class PostController extends Controller
{
    /**
     * Define your validation rules in a property in 
     * the controller to reuse the rules.
     */
    protected $validationRules = [
        'email' => 'required|email',
        'games' => 'required|numeric',
    ];

    /**
     * Show the edit form for blog post.
     * We create a JsValidator instance based on shared validation rules.
     *
     * @param  string|int  $post_id
     * @return \Illuminate\Http\Response
     */
    public function edit($post_id)
    {
        $jsValidator = JsValidator::make($this->validationRules);
        $jsValidator->sometimes('reason', 'required|max:500');

        $post = Post::find($post_id);
    
        return view('edit_post')->with([
            'validator' => $jsValidator,
            'post' => $post,
        ]);
    }

    /**
     * Store the incoming blog post.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        $validation = Validator::make($request->all(), $this->validationRules]);
        $validation->sometimes('reason', 'required|max:500', function ($input) {
            return $input->games >= 100;
        });

        if ($validation->fails()) {
            return redirect()->back()->withErrors($validation->errors());
        }

        // do store stuff
    }
}

To enable conditional validations, in the controller you need to specify the attribute and rules to validate conditionally. This rules will be validated using Ajax

$jsValidator->sometimes('reason', 'required|max:500');