Run user script only if page has a password field

Question

I have a short piece of JavaScript code that I'm using as a user script. The action works fine, but I want to add if-statement to it and don't know how to structure it.

In plain language, I want it to do this:

• If there is a password input field on the page, then do not run my action.

or alternately

• If there is no password input field on this page, then run my action.

How is this accomplished? I'm fiddling with document.querySelectorAll but so far no luck.

Answer 1

You can use document.querySelector to check for the existence.

if (!document.querySelector('input[type=password]')) {
    // your code here
}