Form Validation detailed errors

[Wail75]

Hello,

So I am using Mojolicious::Validator for the first time. After reading the tutorial, I see that one can simply have the invalid field become "field-with-error" and the end user may see the description of the invalid field e.g. in red.

That's neat but what if I want to tell the end user exactly which check did not pass? Is there a very convenient way of doing that? And in a multi-lingual context...
So far, I'm thinking of something like (please don't mind the pseudocode):
(in the Controller)
render "missing name field" if $v->required('name')->has_error;
render "name length must be between 4 and 10" if $v->size('name', 4, 10)->has_error;
Then, the error message gets translated in the template (with the Mojolicious::Plugin::I18N plugin).

I also thought of running all the validation and then looking in the return value of $v->error() if $v->has_error();

[daleif]

I tend to use something similar to this in the templates. I don't feel the full error message on validation belongs in the controller. That is more a template thing.

%= text_field 'foobar'
% if ( my $e = validation->has_error('foobar') ) {
    <div class="error">
    %= 'Required'     if $e->[0] eq 'required'
    %= ...
    </div>
% }

The validation system only spits out these markers (the name of the validation the failed). It is your job to write a suitable error message for it.

Using suitable helpers one can simplify to

%= text_field 'foobar'
%= validation_error 'foobar' => begin 
    %= 'Required'     if $_->[0] eq 'required'
    %= ...
% end

making the syntax much simpler.

[Wail75]

Thank you, that's very inspiring, I'll follow that.
What I really wanted was a way to connect the specific validation fail with the UI (while allowing translation), it is very elegant in your answer.

[guest20]

In most cases you likely want to show the validation rules to the user before they fill out / submit the form...

For example: It's really frustrating to generate a reasonably long password only to be told "lmao it has to be between 8 and 10 characters and not have special characters", especially when coming back to the form means selecting another 4 photos of traffic lights...

[Wail75]

Yes but I wanted to be specific, like saying just "min 3 characters" instead of "between 3 and 10 chars, at least one special char etc".

[guest20]

The path you are on leads to telling your user "This field must match the regex /.+@(.+[.])+.+/ "