custom validation for custom property editor

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ssougnez 93 posts 319 karma points c-trib

Oct 09, 2018 @ 15:17
0

Custom validation for custom property editor
Hello,

I'm creating a simple property editor:
```
<div>
    <input id="page-url" type="text" class="umb-editor umb-text-string" ng-model="model.value" val-property-validator="validateUrl"  />
</div>
```
The code from "validateUrl" is the following:
```
this._$scope.validateUrl = () => {
    return {
        isValid: !this._$scope.error,
        errorMsg: "This URL is already associated to another page",
        errorKey: "pageUrlValidation"
    }
}
```
Nothing really fancy here but I have a weird behavior. Indeed, with this code, the value of "model.value" is never shown in the "input". Moreover, what I type in it, "model.value" is not updated, it's like "ng-model" was not applied. Therefore, when I try to save the node, the validation function always execute on the same value. I tried to display "model.value" on the page and I can see that the value is never updated.

The value of "_$scope.error" is updated when the user types in the input.

Note that if I remove the "val-property-validator" attribute, the "ng-model" applies correctly but then I'm unable to apply custom validation on it.

When I looked in UmbracoCms repo, I noticed that fields with the validation are often hidden (I didn't check all the files) but I guess it's because the UI forces it...

Am I missing something here?
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Jamie Freeman 38 posts 151 karma points

Oct 10, 2018 @ 10:20

have you tried doing something like

<div ng-scope="model">
  <input id="page-url" type="text" class="umb-editor umb-text-string" ng-model="value" val-property-validator="validateUrl"  />
</div>

equally (without knowing the rest of the scope) have you tried just value

<div>
    <input id="page-url" type="text" class="umb-editor umb-text-string" ng-model="value" val-property-validator="validateUrl"  />
</div>

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ssougnez 93 posts 319 karma points c-trib

Oct 10, 2018 @ 13:52

0

I'll try that but after some research it turns out it's an Angular issue. When you use a directive that requires "ngModel", you have to use "$parent" in the binding to make it works... I created a custom directive to see what was the issue and solved the issue by using this trick.

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Dan White 206 posts 510 karma points c-trib

Mar 05, 2019 @ 01:36

0

Could you provide an example how you got it working?

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ssougnez 93 posts 319 karma points c-trib

Mar 05, 2019 @ 07:22

Hi,

it's a long time ago so I don't remember well but here are the relevant part of my code. First of all, I changed a bit the purpose of the validator. It just checks whether a boolean is true/false.

Here is the HTML where I use it:

<input type="text"
       class="umb-editor umb-text-string"
       ng-model="$parent.$ctrl.model.value"
       property-boolean-validator="$parent.$ctrl.error"
       property-boolean-validation-error-message="This URL is already used by another page."
       property-boolean-validator-key="uniqueUrl" />

The trick here is to use "$parent" in the HTML instead of directly "$ctrl" as AngularJs 1.x as this issue. Note that in the code, I also listen to input event on the textbox with RxJs (to use debounceTime) and change the value of $ctrl.error based on the entered value.

Now, the code of the directive (it's TS):

export function PropertyBooleanValidatorDirective(): ng.IDirective {
    return {
        restrict: "A",
        scope: {
            propertyBooleanValidator: '=',
            propertyBooleanValidationErrorMessage: '@',
            propertyBooleanValidatorKey: '@'
        },
        require: ["ngModel", "?^umbProperty"],
        link: (scope: IPropertyBooleanValidatorScope, element: ng.IAugmentedJQuery, attrs: ng.IAttributes, ctrls: ng.IController[]) => {
            var modelCtrl = ctrls[0] as ng.INgModelController;
            var propCtrl = ctrls.length > 1 ? ctrls[1] : null;

            if (propCtrl) {
                scope.$watch(() => scope.propertyBooleanValidator, (nv: boolean) => {
                    modelCtrl.$setValidity(scope.propertyBooleanValidatorKey, !nv);

                    if (nv === true) {
                        propCtrl.setPropertyError(scope.propertyBooleanValidationErrorMessage);
                    }
                    else {
                        propCtrl.setPropertyError(null);
                    }
                });
            }
        }
    }
}

So basically I just watch the value of the attributes and update the field validity based on its value.

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