I am dealing with a parent element that contains a child element, but the child element is only revealed when a button is clicked.
Here is what the initial parent element looks like:
<div class="parent">
<!--v-if-->
</div>
After the button is clicked:
<div class="parent">
<div class="child"></div>
</div>
Now, I need to determine whether the parent element contains a child element using JavaScript. How can this be accomplished?
Use of el.hasChildNodes in JavaScript- This method can get the job done, however, it will also count non-element nodes.
el.children- This property only includes element nodes.
let container1 = document.getElementById("container1");
let container2 = document.getElementById("container2");
let container3 = document.getElementById("container3")
console.log('Container1 contains children - ', container1.hasChildNodes());
console.log('Container1 contains children - ', Boolean(container1.children.length));
console.log('Container2 contains children - ', container2.hasChildNodes());
console.log('Container2 contains children - ', Boolean(container2.children.length));
console.log('Container3 contains children - ', container3.hasChildNodes());
console.log('Container3 contains children - ', Boolean(container3.children.length));<!-- container 1 -->
<div id="container1"></div>
<!-- container 2 -->
<div id="container2">
<div id="child1"></div>
</div>
<!-- container 3 -->
<div id="container3">
<!-- comment -->
</div>At the outset, this element does contain child nodes such as two text nodes and a comment node, but it lacks any element children.
If you are curious about whether there are element children present, you can utilize firstElementChild. This will return null if no child elements exist within the element, or the first child element if they do.
const x = document.querySelector(".parent");
console.log(`Initially: ${!!x.firstElementChild}`);
// Simulate replacing the comment node with an element node
const div = document.createElement("div");
div.className = "child";
x.replaceChild(div, x.childNodes[1]);
console.log(`After Replacement: ${!!x.firstElementChild}`);<div class="parent">
<!--v-if-->
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