Laravel扩展刀片模板 - $ errors集合中的错误

Question

I am using Laravel 5.3. My first Laravel project/learning experience In my blade file I use the following snippet to show the errors below a field after a PUT or POST request.

In this case the database field is called firstName

        @if ($errors->has('firstName'))
            <span class="help-block">
                <strong>{{ $errors->first('firstName') }}</strong>
            </span>
        @endif

Now since I have lot of fields, I have keep repeatings this block for every field. I looked up the Laravel docs on Blade templates (Extending Blade section) and thought I could do the following in the AppServiceProvider class (AppServiceProvider .php)

public function boot()
{
    //
    Blade::directive('showIfError', function($fieldName) {
        if ($errors->has('$fieldName')) {
            echo "<span class='help-block'>
            <strong> $errors->first('$fieldName') </strong>
            </span>";
        }
    });
}

and then use

@showIfError('firstName')

But no luck...I get the error 'Undefined variable: errors'

Looks like the Laravel error collection is not accessible in this view file.

Appreciate any help. Thanks.

Answer 1

The thing is $errors in not accessible in closure. Also, you can't pass whole object as directive closure accepts string only. With simple data you can implode() and then explode() it, but not with an object or a collection.

What you can do is to create $errors manually inside the closure.

I've tested it and it works as expected:

Blade::directive('showIfError', function($fieldName) {
    $errors = session('errors');

    if ($errors->has($fieldName)) {
        return "<span class='help-block'>".$errors->first($fieldName)."</span>";
    }
});