Currently, I am in the process of developing a directive using AngularJS 1.5 and TypeScript 1.7 to enable custom form validation.
I came across this example but encountered an issue with Typescript displaying a 'Type signature is missing in type' error when extending the ng.INgModelController.
interface IOneItemRequiredValidator extends ng.INgModelController {
$validators: {
oneItemRequired(modelValue: any, viewValue: any) : boolean;
};
}
Upon reviewing $validators, I observed that it is defined as type IModelValidators, with the following signature:
interface IModelValidators {
[index: string]: (modelValue: any, viewValue: any) => boolean;
}
To address this, I attempted to align my approach with the existing structure. While TypeScript no longer throws errors, I face difficulty accessing the new property within the $validators object.
interface IOneItemRequiredValidator extends ng.INgModelController {
$validators: {
[oneItemRequired: string]: (modelValue: any, viewValue: any) => boolean;
};
}
angular
.module('app')
.directive('oneItemRequired', () => {
return {
restrict: 'A',
require: 'ngModel',
link: (scope: ng.IScope, element: ng.IAugmentedJQuery, attributes: ng.IAttributes, controller: IOneItemRequiredValidator) => {
controller.$validators.oneItemRequired = (modelValue, viewValue) => {
return viewValue !== null && viewValue !== undefined && viewValue.length > 0;
}
}
};
});
https://i.sstatic.net/LhGXo.png
Could there be an issue with how I have declared the new IOneItemRequiredValidator interface? Any insights would be greatly appreciated. Thanks!