TypeScript can't submit form [duplicate]

Question

When is use typescript,vs tell me HTMLElment will don't have the submit property.

document.getElementById('case_form').submit();

How can i use form.submit() in the typescript file?

Answer 1

You need to tell TypeScript that this element is in fact a <form>:

var myForm = <HTMLFormElement>document.getElementById('case_form');
myForm.submit();

The main point here is <newType>value, which tells TypeScript to convert value to newType.