Why do I keep getting errors in TypeScript when I manipulate DOM elements using getElementsByClassName(), even though my application still functions properly?

I am dealing with an Angular2 application. Unfortunately, I have had to resort to using the following code within a component method (I know it's not ideal, but...):

let confirmWindowDOM = document.getElementsByClassName('modal')[0];
confirmWindowDOM.style['z-index'] = "2049";

This code triggers an error that shows up in the console:

(program):75 ./some/path/to/component.component.ts
(103,28): error TS2339: Property 'style' does not exist on type 'Element'.

Despite the error, the application still functions as expected.

Now, I have a couple of questions:

  1. Although this is valid JavaScript syntax, TypeScript, being a superset of JavaScript, should not have any issues with it. However, even after modifying the code slightly to 
    document.getElementsByClassName('modal')[0].style['z-index'] = "1051";
    , the error persists and tests fail. Why is this happening?
  2. Is there a way to suppress or fix this error in TypeScript?
angularjstypescriptwebpack

Answer №1

getElementsByClassName retrieves a collection of Element. If you want to specify to TypeScript that it is specifically an HTMLElement, you can use a type assertion:

let modalElement = document.getElementsByClassName('modal')[0] as HTMLElement;

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