I'm working on a project and I've encountered the following code snippet.
function myFunction() {
var c = document.getElementById("myID").childElementCount;
alert(c);
}
Is there a similar way to achieve this functionality?
function myFunction() {
var c = document.getElementsByClass("myClass").childElementCount;
alert(c);
}
While there isn't a function called getElementByClass in JavaScript, there is one called getElementsByClassName. This method returns a collection of elements since multiple elements can have the same class attribute. In contrast, IDs are unique within a document and limited to one per element.
To access specific elements within the collection by index, you can use code like this:
var elements = document.getElementsByClassName('myClass');
var count = elements[0].childElementCount;
alert(count);
One way to achieve this is by using the document.getElementsByClassName method, which returns an HTMLCollection containing all elements with a specific class name (as opposed to just one Element). You can easily convert this HTMLCollection into an array using the spread syntax [...x].
If you need to find the sum of child elements within all parent elements with the class .myClass:
[...document.getElementsByClassName('myClass')]
.reduce((sum, parent) => sum += parent.childElementCount, 0);
Another option is to use the newer and more concise document.querySelector[All] methods:
[...document.querySelectorAll('.myClass')]
.reduce((sum, parent) => sum += parent.childElementCount, 0);
@evolutionxbox provided a solution in the form of a comment, which is actually the correct answer. @evolutionxbox, could you please convert your comment into an official answer for marking purposes?
The approach suggested by @evolutionxbox is effective.
function calculateTotal() {
var count = document.getElementsByClassName('myClass').length;
alert(count);
}
To determine the total number of children with a specific className, follow these steps:
function calculateTotalChildren(selector){
let count = 0;
let elements = document.querySelectorAll(selector);
for(let element of elements){
count += element.children.length;
}
return count;
}
calculateTotalChildren('.myClass');
If you want to achieve this, consider utilizing jQuery:
let totalChildren = $("#myID").children().length;
To get the number of child elements in the parent element, you can utilize the childElementCount property as demonstrated below:
document.getElementsByClassName('myClass')[0].childElementCount
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