Unresolved variable checked

Created May 31, 2019 17:24

Hi,

I am using this code:

document.getElementById('member').addEventListener('change', (event) => {
  if (event.target.checked) {
    console.log('Hello');
  }
});

but Intellij gives me the warning:

Unresolved variable checked

Why do I get this warning? My code works fine and I get the console log.

3 comments

Elena Pogorelova

Created June 01, 2019 11:15

The IDE has no idea what your target element is, and EventTarget interface doesn't have checked property. You need to explicitly tell the IDE the type of the HTMLElement which is your target. For example, in Typescript this would be:

document.getElementById('member').addEventListener('change', (event) => {
 const checkbox: HTMLInputElement = <HTMLInputElement>event.target;
 if (checkbox.checked) {
  console.log('Hello');
 }
});

Ray Zah

Created June 02, 2019 21:56

And how would you do it with JavaScript?

Elena Pogorelova

Created June 03, 2019 11:24

document.getElementById('member').addEventListener('change', (event) => {
  const checkbox = /**HTMLInputElement*/event.target;
  if (checkbox.checked) {
    console.log('Hello');
  }
});

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