ParentNode.prepend()

ParentNode.prepend() 메소드는 Node 객체 또는DOMString 객체를 ParentNode의 첫 자식노드 앞에 삽입한다. DOMString 객체는 Text 노드와 동일하게 삽입된다.

Syntax

ParentNode.prepend(...nodesToPrepend);

Parameters

nodesToPrepend
One or more nodes to insert before the first child node currently in the ParentNode. Each node can be specified as either a Node object or as a string; strings are inserted as new Text nodes.

Return value

undefined.

Exceptions

Examples

Prepending an element

var parent = document.createElement("div");
var p = document.createElement("p");
var span = document.createElement("span");
parent.append(p);
parent.prepend(span);

console.log(parent.childNodes); // NodeList [ <span>, <p> ]

Prepending text

var parent = document.createElement("div");
parent.append("Some text");
parent.prepend("Headline: ");

console.log(parent.textContent); // "Headline: Some text"

Appending an element and text

var parent = document.createElement("div");
var p = document.createElement("p");
parent.prepend("Some text", p);

console.log(parent.childNodes); // NodeList [ #text "Some text", <p> ]

ParentNode.prepend() is unscopable

The prepend() method is not scoped into the with statement. See Symbol.unscopables (en-US) for more information.

var parent = document.createElement("div");

with(parent) {
  prepend("foo");
}
// ReferenceError: prepend is not defined 

Polyfill

You can polyfill the prepend() method if it's not available:

// Source: https://github.com/jserz/js_piece/blob/master/DOM/ParentNode/prepend()/prepend().md
(function (arr) {
  arr.forEach(function (item) {
    if (item.hasOwnProperty('prepend')) {
      return;
    }
    Object.defineProperty(item, 'prepend', {
      configurable: true,
      enumerable: true,
      writable: true,
      value: function prepend() {
        var argArr = Array.prototype.slice.call(arguments),
          docFrag = document.createDocumentFragment();

        argArr.forEach(function (argItem) {
          var isNode = argItem instanceof Node;
          docFrag.appendChild(isNode ? argItem : document.createTextNode(String(argItem)));
        });

        this.insertBefore(docFrag, this.firstChild);
      }
    });
  });
})([Element.prototype, Document.prototype, DocumentFragment.prototype]);

Specification

Specification Status Comment
DOM
The definition of 'ParentNode.prepend()' in that specification.
Living Standard Initial definition.

Browser compatibility

No compatibility data found for api.ParentNode.prepend.
Check for problems with this page or contribute missing data to mdn/browser-compat-data.

See also