I have the following Javascript code:
var now = new Date();
now.setDate(now.getDate() + 7);
document.getElementById('txtCreateGroupExpirationDate').valueAsDate = now;
When I throw this code into a TypeScript file, TypeScript complains with the following error:
Property 'valueAsDate' does not exist on type 'HTMLElement'
My Javascript works fine and valueAsDate
is a legal property, as defined by the Mozilla Developer Network . In addition, you can see that this property is defined in the Microsoft Typescript Core .
So why am I getting this error? I am using Typescript 2.0.
valueAsDate
is only supported on HTMLInputElement
, and TypeScript doesn't know what kind of element txtCreateGroupExpirationDate
is. Use a type assertion to change the type of the expression:
(<HTMLInputElement>document.getElementById('txtCreateGroupExpirationDate')).valueAsDate = now;
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