The specified property 'nodeName' is not recognized within the data type 'EventTarget'

In the code snippet below, we are checking whether the user is interacting with an input field, textarea, or contenteditable element. If any of these conditions are met, we should clear out the keys array and stop the script execution.

let keys: any[] = []

document.addEventListener('keypress', event => {
  if (event.key === ' ') return
  if (event.target === null) return // Should remove this?
  if (event.target.nodeName === 'INPUT' ||
    event.target.nodeName === 'TEXTAREA' ||
    event.target.isContentEditable) {
    keys = []
    return
  }
})

console.log(keys)

An error message related to TypeScript syntax pops up:

Property 'nodeName' does not exist on type 'EventTarget'.
Property 'nodeName' does not exist on type 'EventTarget'.
Property 'isContentEditable' does not exist on type 'EventTarget'.

What causes this error and what steps can be taken to resolve it?

View the live code example here: https://codesandbox.io/s/cover-image-forked-7n8z7w?file=/src/index.ts

Answer №1

EventTarget does not necessarily have to be an HTMLElement or a Node

You can update your second condition to:

if (!(event.target instanceof HTMLElement)) return;

Answer №2

Examples of event targets can range from xhr requests to web workers, which is why Typescript wisely doesn't assume it's always a DOM node.

Once this awareness sinks in, the key lies in narrowing down the type through runtime checks that are understandable by the compiler.

document.addEventListener('keypress', (evt: KeyboardEvent) => {
  const { target } = evt;
  // Keep in mind that XHR requests and other types can be event targets without a nodeName
  if (target instanceof HTMLElement) {
    console.log(target.nodeName);
    if (target.isContentEditable) {
      // Proceed with handling as you would for a textarea
    }
  }
});

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