I am struggling with a basic JavaScript script to select a child element using getElementsByClassName, but it does not seem to be working as expected:
var parent = document.getElementsByClassName('parent');
var child = parent.getElementsByClassName('child');
child.style.color='red';
I have attempted various approaches and researched extensively, only finding answers that involve looping. However, I prefer to achieve this without using loops. Is there a method to accomplish this task?
Obtain the entire list of nodes in just one action
var elements = document.querySelectorAll(".parent .child");
Afterwards, you will need to iterate through that list of nodes.
If your main focus is on the first node specifically, you can execute
document.querySelector(".parent .child").style.color = 'blue';
Give this a shot:
let containers = document.querySelectorAll('.container');
containers.forEach(container => {
let children = container.querySelectorAll('.child');
children.forEach(child => {
child.style.backgroundColor = 'blue';
});
});
Note that document.querySelectorAll() returns a collection, so looping through it is necessary.
When dealing with classes, multiple elements can belong to the same class. This is the essence of utilizing classes in programming.
In the method getElementsByClassName, notice that the term "elements" is emphasized as being plural. It actually produces a collection known as a NodeList, which consists of multiple Element nodes rather than just one.
This NodeList can be treated similarly to an array. You must iterate through each node it returns or rely on accessing the first match using [0].
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