/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

2 votes349 views2 answers
Typescript property state does not exist
TypeScript
1 vote375 views1 answer
Nuxt @use "sass:math";
TypeScript
3 votes308 views4 answers
Remove item from array if exists in another array
TypeScript
0 vote331 views1 answer
How to display dotted line betweens 2 series point in high charts react native
TypeScript
0 vote327 views1 answer
Whats a typedef in c++
TypeScript
0 vote322 views1 answer
Angular typescript filter array group by attribute
TypeScript
0 vote363 views2 answers
Cannot find module 'tns-core-modules/platform' or its corresponding type declarations
TypeScript
4 votes368 views1 answer
Enumerate multiple lists python
TypeScript
2 votes370 views2 answers
How to check constraints on a table in sql oracle
TypeScript
0 vote345 views1 answer
Nuxt typescript middleware property
TypeScript