NodeList.prototype.forEach()
The forEach()
method of the NodeList
interface calls the callback given in parameter once for each value pair in the list, in
insertion order.
Syntax
someNodeList.forEach(callback[, thisArg]);
Parameters
callback
-
A function to execute on each element of
someNodeList
. It accepts 3 parameters:currentValue
-
The current element being processed in
someNodeList
. currentIndex
Optional-
The index of the
currentValue
being processed insomeNodeList
. listObj
Optional-
The
someNodeList
thatforEach()
is being applied to.
thisArg
Optional-
Value to use as
this
when executingcallback
.
Return value
Example
let node = document.createElement("div");
let kid1 = document.createElement("p");
let kid2 = document.createTextNode("hey");
let kid3 = document.createElement("span");
node.appendChild(kid1);
node.appendChild(kid2);
node.appendChild(kid3);
let list = node.childNodes;
list.forEach(
function(currentValue, currentIndex, listObj) {
console.log(currentValue + ', ' + currentIndex + ', ' + this);
},
'myThisArg'
);
The above code results in the following:
[object HTMLParagraphElement], 0, myThisArg [object Text], 1, myThisArg [object HTMLSpanElement], 2, myThisArg
Polyfill
This polyfill adds compatibility to all Browsers supporting ES5:
if (window.NodeList && !NodeList.prototype.forEach) {
NodeList.prototype.forEach = function (callback, thisArg) {
thisArg = thisArg || window;
for (var i = 0; i < this.length; i++) {
callback.call(thisArg, this[i], i, this);
}
};
}
OR
if (window.NodeList && !NodeList.prototype.forEach) {
NodeList.prototype.forEach = Array.prototype.forEach;
}
The above behavior is how many browsers actually implement
NodeList.prototype.forEach()
(Chrome, for example).
Specifications
No specification found
No specification data found for api.NodeList.forEach
.
Check for problems with this page or contribute a missing spec_url
to mdn/browser-compat-data. Also make sure the specification is included in w3c/browser-specs.
Browser compatibility
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