/TypeScript/Property "'element'" does not exist on type 'htmlelement'.ts(2339)

Property "'element'" does not exist on type 'htmlelement'.ts(2339)

Property 'value' does not exist on type 'HTMLElement'.

document.getElementById() returns the type HTMLElement which does not contain a value property.
The subtype HTMLInputElement does however contain the value property.

So a solution is to cast the result of getElementById() to HTMLInputElement like this:

var inputValue = (<HTMLInputElement>document.getElementById(elementId)).value;
<> is the casting operator in typescript.
See TypeScript: casting HTMLElement: https://fireflysemantics.medium.com/casting-htmlelement-to-htmltextareaelement-in-typescript-f047cde4b4c3

The resulting javascript from the line above looks like this:

inputValue = (document.getElementById(elementId)).value;
i.e. containing no type information.

Source: fireflysemantics.medium.com

Property 'on' does not exist on type 'HTMLElement'.

To prevent this error you can write:

var plotDiv: any = document.getElementById('myDiv');
plotDiv.on('plotly_relayout', ...
document.getElementById('myDiv') return HTMLElement. This type doesn't contain method
on because this method is added within plotly-latest.min.js. So in order to silence
the typescript warning you can explicity say compile not to check types for plotDiv

Another way is create type definition like:

interface PlotHTMLElement extends HTMLElement  {
  on(eventName: string, handler: Function): void;
}

var plotDiv  = <PlotHTMLElement>document.getElementById('myDiv')
plotDiv.on('plotly_relayout', function() {

});

Property "'element'" does not exist on type 'htmlelement'.ts(2339)

// For getting `.elements` with forms you need to cast as:
// `HTMLFormElement`

const form = document.getElementById('my-id') as HTMLFormElement;

Similar codes

0 vote192 views1 answer
Convert epoch to normal date | stripe | epoch
TypeScript
9 votes208 views3 answers
React typescript onclick type
TypeScript
2 votes212 views1 answer
Ts-node call function from command line
TypeScript
-1 vote218 views1 answer
Components of api request
TypeScript
6 votes230 views3 answers
Scroll to top angular
TypeScript
8 votes209 views2 answers
List of objects to string c#
TypeScript
0 vote234 views1 answer
Set environment variable typescript
TypeScript
2 votes234 views1 answer
Convert local url to base64 in javascript
TypeScript
0 vote205 views1 answer
Ts compile command
TypeScript
0 vote226 views1 answer
Get alphabets and space only from xml file in android studio
TypeScript