I simply want to do this with my KeyboardEvent var tag = evt.target.tagName.toLowerCase(); While Event.target is of type EventTarget, it does not inherit from Element. So I have to cast it like this: var tag = (<Element>evt.target).tagName.toLowerCase(); This is probably due to some browsers not following standards, right? What is the correct browser-agnostic implementation in … Read more
I’m trying to create a new object of a type parameter in my generic class. In my class View, I have 2 lists of objects of generic type passed as type parameters, but when I try to make new TGridView(), TypeScript says: Could not find symbol ‘TGridView This is the code: module AppFW { // … Read more
At the risk of demonstrating my lack of knowledge surrounding TypeScript types – I have the following question. When you make a type declaration for an array like this… position: Array<number>; …it will let you make an array with arbitrary length. However, if you want an array containing numbers with a specific length i.e. 3 … Read more
I just want to declare a static property in typescript interface? I have not found anywhere regarding this. interface myInterface { static Name:string; } Is it possible? 18 Answers 18
The Typescript enum seems a natural match with Angular2’s ngSwitch directive. But when I try to use an enum in my component’s template, I get “Cannot read property ‘xxx’ of undefined in …”. How can I use enum values in my component template? Please note that this is different from how to create html select … Read more
I am trying $(function(){ alert(‘Hello’); }); Its showing this error in Visual Studio: (TS) Cannot find name ‘$’.. How can I use jQuery with TypeScript ? 13 Answers 13
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago. Improve this question I would like some variables to be accessible everywhere in an Angular 2 in the Typescript … Read more
This is similar to #40796374 but that is around types, while I am using interfaces. Given the code below: interface Foo { name: string; } function go() { let instance: Foo | null = null; let mutator = () => { instance = { name: ‘string’ }; }; mutator(); if (instance == null) { console.log(‘Instance … Read more
I am having some trouble working out how defining constructors in interfaces work. I might be totally misunderstanding something. But I have searched for answers for a good while and I can not find anything related to this. How do I implement the following interface in a TypeScript class: interface MyInterface { new ( … … Read more
Explain to me what keyof typeof means in TypeScript Example: enum ColorsEnum { white=”#ffffff”, black = ‘#000000’, } type Colors = keyof typeof ColorsEnum; The last row is equivalent to: type Colors = “white” | “black” But how does it work? I would expect typeof ColorsEnum to return something like “Object” and then keyof “Object” … Read more
