Element: before() method
The Element.before()
method inserts a set of
Node
objects or strings in the children list of this
Element
's parent, just before this Element
.
Strings are inserted as equivalent Text
nodes.
Syntax
js
before(param1)
before(param1, param2)
before(param1, param2, /* …, */ paramN)
Parameters
Return value
None (undefined
).
Exceptions
HierarchyRequestError
DOMException
-
Thrown when the node cannot be inserted at the specified point in the hierarchy.
Examples
Inserting an element
js
let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);
let span = document.createElement("span");
p.before(span);
console.log(container.outerHTML);
// "<div><span></span><p></p></div>"
Inserting text
js
let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);
p.before("Text");
console.log(container.outerHTML);
// "<div>Text<p></p></div>"
Inserting an element and text
js
let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);
let span = document.createElement("span");
p.before(span, "Text");
console.log(container.outerHTML);
// "<div><span></span>Text<p></p></div>"
Specifications
Specification |
---|
DOM Standard # ref-for-dom-childnode-before① |
Browser compatibility
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