"Error TS2339: The property specified does not exist within type definition", located on the input field

When a user clicks a specific button, I need an input field to be focused with its text value selected entirely to allow users to replace the entire value while typing.

This is the markup for the input field:

<input type="text" id="descriptionField" class="form-control">

And here's the function that handles the focus/select functionality:

public copy(): void {
    document.getElementById("descriptionField").focus();
    document.getElementById("descriptionField").select();
}

While .focus() works fine, .select() throws an error:

TS2339: Property 'select' does not exist on type 'HTMLElement'.

I've searched for solutions without relying on jQuery. Is there a way to solve this using native implementation or TypeScript?

Answer №1

If you want to convert the HTMLElement to a type with the select method, you can use type-casting:

(document.getElementById("descriptionField") as HTMLInputElement).select();

Alternatively, you can also do it this way:

(<HTMLInputElement>document.getElementById("descriptionField")).select();

This approach simply informs the compiler that you are aware of the expected type, which is known as Type Assertions in TypeScript.

While this technique doesn't impact the runtime, it helps prevent the compiler from raising any errors.

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