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JavaScript One Solution

Kishan P
Kishan P
9,921 Points
Posted by Kishan P
Kishan P
9,921 Points

need help with the second question?

// 2: Select all the <h2> elements in the document.
//    Set the color of the <h2> elements to a different color.
const h2  = document.getElementsByTagName ('h2');
  h2.style.border = "2px solid red";

Why does the instructor using for loop and why can't i use this to change the color?

1 Answer

Michael Williams
PLUS
Michael Williams
Courses Plus Student 8,059 Points
Michael Williams
Michael Williams
Courses Plus Student 8,059 Points

It's because const h2 = document.getElementsByTagName ('h2'); returns an array-like object. They key giveaway here is that elements is plural. So you know it's going to return more than one element and store them like an array.

Therefore, you need a loop to iterate over each one to change it. Otherwise, it won't know which one to change.

Hope this helps!

Seth L
Seth L
6,212 Points

Does this apply to querySelectorAll as well? I keep getting an undefined error when I try that method (without the loop) as opposed to querySelector which works fine at grabbing the first occurrence.

edit: found the answer myself. I would need to iterate over all for querySelectorAll