How to insert an element after another element in JavaScript without using a library?

There's insertBefore() in JavaScript, but how can I insert an element after another element without using jQuery or another library?

回答1

referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);

Where referenceNode is the node you want to put newNode after. If referenceNode is the last child within its parent element, that's fine, because referenceNode.nextSibling will be null and insertBefore handles that case by adding to the end of the list.

So:

function insertAfter(newNode, referenceNode) {
    referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
}

You can test it using the following snippet:

function insertAfter(referenceNode, newNode) {
  referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
}

var el = document.createElement("span");
el.innerHTML = "test";
var div = document.getElementById("foo");
insertAfter(div, el);

<div id="foo">Hello</div>

回答2

Though insertBefore() is great and referenced by most answers here. For added flexibility, and to be a little more explicit, you can use:

The insertAdjacentElement() as refElem.insertAdjacentElement(position, newElem) lets you reference any element, and insert the to-be moved element exactly where you want (position can be one of: 'beforebegin', 'afterbegin', 'beforeend', 'afterend') as shown below:

// refElem.insertAdjacentElement('beforebegin', myElem); 
<p id="refElem">
    // refElem.insertAdjacentElement('afterbegin', myElem);
    ... content ...
    // refElem.insertAdjacentElement('beforeend', myElem);
</p>
// refElem.insertAdjacentElement('afterend', myElem);

Others to consider for similar use cases: insertAdjacentHTML() and insertAdjacentText()

References:

https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentElement https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentHTML https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentText