Tips for resolving the setAttribute() function error message: "Argument of type 'boolean' is not assignable to parameter of type 'string'"

I am currently working on a function that dynamically updates the HTML aria-expanded attribute based on whether it is true or false. However, when I declare element as HTMLElement, I encounter an error stating

Argument of type 'boolean' is not assignable to parameter of type 'string'

  expandEotyDocumentsPanel(element: HTMLElement) {
    this.eotyExpanded = !this.eotyExpanded;
    element.setAttribute('aria-expanded', this.eotyExpanded);
  }

It is important to note that this.eotyExpanded is a boolean.

In relation to the second argument of setAttribute(), guidance from the documentation available on MDN states:

A DOMString containing the value to assign to the attribute. Any non-string value specified is converted automatically into a string.

This led me to believe that providing a boolean value should be acceptable.

Is there a way for me to resolve this error?

Thank you.

Answer №1

In the case where an element's attribute cannot be a boolean, the workaround is to convert it into a string using the following code:

new Boolean(this.eotyExpanded).toString()

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