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

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

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() {

});

Similar codes

0 vote197 views1 answer
Default value to select simple form for
Html
21 votes205 views4 answers
Bootstrap 5 text bold
Html
1 vote283 views1 answer
Html link para descargar archivo de audio
Html
2 votes229 views4 answers
Meta property="og:description"
Html
0 vote187 views1 answer
Block media keys from html audio pause
Html
0 vote211 views1 answer
Vue-date-pick
Html
10 votes175 views6 answers
Bootstrap 5 tab
Html
13 votes211 views2 answers
Bootstrap header
Html
0 vote198 views1 answer
38 1,2
Html
2 votes196 views3 answers
Hypertext markup language
Html