can somebody explain the meaning of following code

Question

function handleEnter(event) {
      if (event.key==="Enter") {
          const form = document.getElementById('form')
          const index = [...form].indexOf(event.target);
          form.elements[index + 1].focus();
        }
    }

This code is use for focusing on next input field after pressing Enter somebody explain me this code line by line? it will be big help

Answer 1

Line 1:

const form = document.getElementById('form')

Get the DOM element from html

Line 2:

const index = [...form].indexOf(event.target);

Find in the form elements the index of the current element. I think this line is not correct, I suppose that you want to get child elements from the form element, if so, it should be something like:

const index = form.children.indexOf(event.target);

Line 3:

form.elements[index + 1].focus();

The next element should be the current index plus 1, so just run focus on next element, but as I said, I think that your line 2 is not correct so this line should be something like:

form.children[index + 1].focus();

Answer 2

As I understand. 2nd line: This funct will perform only when press Enter key 3rd line: get information from the form input ("form" ID) 4th line: get the index of the form input 5th line: move the focus point to the next element (which is index+1)

Answer 3

Bro, understanding this code is quite easy you just need to break it down. Let's start with it:-

• First it is JavaScript function in which html event is passed as argument.
• Second checks whether the event that is triggered is enter key event
• If yes, then the next statement will be executed that will select element with form as id.
• Now from the all the input fields of form current input field will be selected.
• At last, the index of element that is focus is increment that will shift the focus to next input field in the form.