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My form contains fields:

    label: Region
    type: dropdown
    options: listRegions
    label: District
    type: dropdown
    options: listDistricts
    dependsOn: region
    label: City
    type: dropdown
    options: listCities
    dependsOn: district

Code in model:

public function listRegions($value, $data)
    $regions = Regions::getRegions();
    if($value) $regions[$value] = $value; // if not contain
    return $regions;

public function listDistricts($value, $data)
    $districts = Regions::getDistricts($this->region);
    if($value) $districts[$value] = $value; // if not contain
    return $districts;

public function listCities($value, $data)
    $cities = Regions::getCities($this->region, $this->district);
    if($value) $cities[$value] = $value; // if not contain
    return $cities;

In real backend this magic works perfectly, in backtofront no =(

I am forced to perform such a fix:


I found out that in my functions (listDistricts eg) $this is null when a call from BackToFront.

In real backend $this is model object.

The error is precisely at the initial filling of the elements. With manual clicking, this works just as well as in backend.

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Dropdown DependsOn work in little test (user select):

I add this Dropdown

    public function getUserIdOptions(){
        if ($this->user_clients){
            return [$this->user_clients->id];
        } else return [];

Apparently the problem is in the empty value on initialization. Try without using options: list ...

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region is root of this depends tree, he is not empty, When checking all these fields have values.

I open the same object in backend and in backtofront: district in backend with elements, in backtofront no elements. $this is null in function listDistricts when call from backtofront.

backend page load

backtofront page load

backtofront after change trigger


Yes, obviously, the problem is in $this during initialization. It’s hard to say what the problem is, possibly in the backend, as in your case done through ".trigger ('change');" (most likely it is).

Сan also try the option to set the initial values ​​through

public function filterFields($fields, $context = null)....
$this->bindEvent('model.beforeSetAttribute', function ($key, $value)...

I'll try, maybe something will come of this

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