Missing way to use control constants as snippet/snippetArea name

[mstefan21]

We are using control constants to define control names for better orientation in the project code. Unfortunately currently there is no way to do same thing with the snippet. For example:

namespace Vendor\App;

class ExampleForm extends Nette\Application\UI\Form
{

    const CONTROL_SUBMIT = 'submit';
    const SNIPPET_FORM = 'form';

    public function __construct()
    {
        $this->addSubmit(self::CONTROL_SUBMIT, 'submit')
            ->onClick[] = array($this, 'handleSubmit');
    }

    public function handleSubmit(SubmitButton $button)
    {
        $this->onSubmit($button);
        $this->redrawControl(self::SNIPPET_FORM);
    }

}

{form $control::CONTROL_FORM}
    <div n:snippet="$form::SNIPPET_FORM">
        {input $form::CONTROL_SUBMIT}
    </div>
{/form}

or

{form \Vendor\App\ExampleControl::CONTROL_FORM}
    <div n:snippet="\Vendor\App\ExampleForm::SNIPPET_FORM">
        {input \Vendor\App\ExampleForm::CONTROL_SUBMIT}
    </div>
{/form}

This example unfortunately will throw the following exception:
Dynamic snippets are allowed only inside static snippet/snippetArea.

[TomasVotruba]

That probably means the code has to be wrapped in {snippet} macro:

{snippet}
    {form \Vendor\App\ExampleForm::CONTROL_FORM}
        <div n:snippet="$form::SNIPPET_FORM">
            {input $form::CONTROL_SUBMIT}
        </div>
    {/form}
{/snippet}

Could you try that?

[mstefan21]

This was just an example. We need to redraw the specific part, not the whole control.

{form \Vendor\App\ExampleForm::CONTROL_FORM}
    <div n:snippet="$form::SNIPPET_FORM">
        {input $form::CONTROL_SUBMIT}
    </div>
    <div n:snippet="$form::SNIPPET_WE_DONT_WANT_REDRAW">
        {* some big satic data *}
    </div>
{/form}

[dg]

It is dynamic snippet, because value of $form is unknown (ie. can be changed). Something like <div n:snippet="\Vendor\App\ExampleForm::SNIPPET_FORM"> could be maybe supported…

ping @matej21

[mstefan21]

$form|$control is uknown, but we can use static constant like this, but it also doesn't work, because the \Vendor\App\ExampleControl::CONTROL_FORM is interpreted as a string instead of the constant value.

{form \Vendor\App\ExampleControl::CONTROL_FORM}
    <div n:snippet="\Vendor\App\ExampleForm::SNIPPET_FORM">
        {input \Vendor\App\ExampleForm::CONTROL_SUBMIT}
    </div>
{/form}

[dg]

Possible solution is to pass variable $formName = Vendor\App\ExampleControl::class and then use <div n:snippet="$formName::SNIPPET_FORM">

[micha-walter]

I have test this, but it's not working. Same Error as above with this tests:

<div n:snippet="\Vendor\App\ExampleForm::SNIPPET_FORM">

or

{var $formName = Vendor\App\ExampleControl::class}
<div n:snippet="$formName::SNIPPET_FORM">

My packages are:

latte/latte: v3.0.9
nette/application: v3.1.13

Is there a chance that this will be supported in the future?

I used the constants in my code to redraw the controls, so the strings of n:snippet in template and $this->getComponent(\Vendor\App\ExampleForm::SNIPPET_FORM)->redrawControl() in Presenter should always the same.