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JavaScript DOM Scripting By Example Adding and Removing Names Registering Names

ywang04
ywang04
6,762 Points

document.querySelector('input'); VS form.querySelector('input');

Just a quick question:

In this video, Guil is using form.querySelector('input') instead of document.querySelector('input');

I just want to know the benefit of using this way. Thanks in advance.

const input = form.querySelector('input');

1 Answer

Steven Parker
Steven Parker
229,920 Points

Using querySelector('input') on the form element will return the first input element in that particular form, where using it on the document would return the first input element of the entire page.

Now it may be that the form's first input is the first one on the page, but being precise about coding could prevent problems if another form is placed at the top of the page at a later time.

ywang04
ywang04
6,762 Points

Thanks, Steven. It's clear to me.