/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

1 vote135 views1 answer
Meta colors html
Html
2 votes142 views1 answer
Doctype tag
Html
0 vote150 views1 answer
Div tag in html
Html
0 vote179 views1 answer
Svm e1071 cutoff
Html
-1 vote143 views2 answers
How to put icons in select
Html
0 vote144 views1 answer
Bootdtarp
Html
0 vote133 views1 answer
Html acronym
Html
201 votes238 views6 answers
Open in new tab html
Html
147 votes144 views4 answers
Import script html
Html
1 vote138 views1 answer
Html hide a div by default
Html