/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 vote149 views3 answers
Inline scripts encapsulated in <script> tags
TypeScript
4 votes184 views2 answers
How to add a new propety into all documents in mongodb
TypeScript
0 vote184 views1 answer
Typescript find in all words
TypeScript
0 vote210 views1 answer
Upload keystore file to secrets github actions
TypeScript
0 vote214 views1 answer
How to create nest without spec test filefile
TypeScript
0 vote189 views1 answer
Spyon observable
TypeScript
0 vote248 views1 answer
Visible, non-interactive elements with click handlers must have at least one keyboard listener
TypeScript
0 vote181 views1 answer
How to find uncommon elements in two lists in python
TypeScript
0 vote186 views1 answer
Find unique elements in pandas and their connection with other column
TypeScript
1 vote179 views2 answers
Open vsc with admin rights linux
TypeScript