/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

1 vote109 views1 answer
Type script tuple type
TypeScript
0 vote94 views1 answer
Typescript list
TypeScript
1 vote97 views1 answer
Mongo find documents that have a certain key
TypeScript
0 vote95 views1 answer
Mongodb nest.js
TypeScript
7 votes97 views1 answer
Mongodb exists and not null
TypeScript
0 vote116 views1 answer
Return type depends on input typescript
TypeScript
0 vote101 views2 answers
Handlebars custom helper
TypeScript
0 vote112 views1 answer
Is there somone controlling the puppets in peppermint park
TypeScript
0 vote99 views1 answer
Requests python-passlib python-pil -y ubuntu 18.04
TypeScript
1 vote101 views2 answers
Gets syntax
TypeScript