/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 vote212 views1 answer
Text input detect return key react native
TypeScript
2 votes201 views1 answer
Check if file exists laravel
TypeScript
0 vote188 views1 answer
Allow specific string in type
TypeScript
1 vote244 views1 answer
Import exec ts
TypeScript
0 vote222 views1 answer
Custom api endpoints jwt token
TypeScript
4 votes204 views6 answers
Laravel html components
TypeScript
0 vote204 views1 answer
Sr.No. 18, Plot No. 5/3, CTS No.205,Behind Vandevi Temple, Karvenagar, Pune, Maharashtra
TypeScript
1 vote237 views1 answer
Explain the concept of Dangling Pointer and Null Pointer with Examples? Provide brief details of the scenarios in which pointer acts as dangling pointer.
TypeScript
0 vote220 views1 answer
Function which calculates the number of tweets that were posted per day.
TypeScript
1 vote225 views1 answer
How to create multiple sheets in excel using python in openpyxml
TypeScript