Encountering an issue while attempting to assign a value to the rootscope in Typescript.
class TestClass{
this.rootScope: ng.IRootScopeService;
constructor($rootScope){
this.rootScope = $rootScope;
}
addValueToRoot=()=>{
this.rootScope.val1 = "something"; //Error: Property doesn't exist on the IRootScopeService
}
}
This error occurs because the compiler is indicating that val1 is not defined on the ng.IRootScopeService. To resolve this issue, you must extend the interface to include val1, like so:
interface ExtendedRootScope extends ng.IRootScopeService {
val1: string
}
Once you have extended the interface, you can use it in your class as shown below:
class NewClass {
this.customScope: ExtendedRootScope;
...
}
If you're working with TypeScript 1.6, you may have noticed the increased error-catching capabilities.
My usual approach is one of the following:
declare $rootScope: any
cast to ($rootscope as any).val1 = ...
define
$rootScope: ng.IRootScopeService & { [name:string]: any };The third option allows for additional properties to be added to the type. You could even create a type for reuse:
type IExpandable = { [name:string]:any };
$rootScope: ng.IRootScopeService & IExpandable;
Here are some additional options to consider:
this.rootScope["property"] = "value";
(<any>(this.rootScope)).property = "value";
This is the approach that proved effective for me:
Firstly, in a separate file, I created a module called app:
// IRootScopeService.d.ts
declare module app {
interface IRootScopeService extends ng.IRootScopeService {
//
$state: ng.ui.IState
//
previousState: any;
currentState: any;
}
}
I named this file as IRootScopeService.d.ts because it contains declarations using the declare keyword. This file is meant to be exclusively for accessing the interface with app.IRootScopeService.
Next, within the controller file, here's how the controller function looks:
//CoreCtrl-ctrl.ts
...
function CoreCtrl(
$state: angular.ui.IState,
$rootScope: app.IRootScopeService
) {
var vm = this;
$rootScope.previousState = undefined;
$rootScope.currentState = undefined;
$rootScope.$on('$stateChangeSuccess', function(ev, to, toParams, from, fromParams) {
$rootScope.previousState = from.name;
$rootScope.currentState = to.name;
})
// $rootScope.previousState = undefined;
// $rootScope.currentState = undefined;
}
...
Take note of the app.IRootScopeService that provides us with the desired type for $rootScope. With this setup, $rootScope.currentState and $rootScope.previousState will no longer cause errors in typescript.
PART 2
If we want to include more interfaces in the app module, we can create a new file called IScope.d.ts for better modularity:
// IScope.d.ts
declare module app {
interface IScope extends ng.IScope {
//
$root: IRootScopeService;
//
greet:string;
name:string;
address:string;
}
}
Now, we have two customized interfaces, app.IRootScopeService and app.IState, where we can continuously add new properties we wish to incorporate into $rootScope and $scope.
It's worth mentioning that we did not use the ng. prefix in $root: IRootScopeService; since we are accessing app.IRootScopeService from within the module app.
I hope this explanation proves beneficial. Best of luck!
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