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Switch to "element" methods to fix errors #4

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Switch to "element" methods to fix errors #4

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37 changes: 23 additions & 14 deletions next-previous-element.js
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Original file line number Diff line number Diff line change
@@ -1,15 +1,20 @@
"use strict";

// Find the next element in an in-order traversal of a tree of nodes.
function getNextElement(element) {
export function getNextElement(element) {
if (!element) {
return null;
}

// The next element is either this one's first child...
var nextelement = null;
if (element.firstChild) {
nextElement = element.firstChild;
var nextElement = null;
if (element.firstElementChild) {
nextElement = element.firstElementChild;
}

// ...or the next sibling...
else if (element.nextSibling) {
nextElement = element.nextSibling;
else if (element.nextElementSibling) {
nextElement = element.nextElementSibling;
}

// ...or the next sibling for the first ancestor that has one.
Expand All @@ -18,8 +23,8 @@ function getNextElement(element) {
while (true) {
if (current.parentElement) {
var parentElement = current.parentElement;
if (parentElement.nextSibling) {
nextElement = parentElement.nextSibling;
if (parentElement.nextElementSibling) {
nextElement = parentElement.nextElementSibling;
break;
}
else {
Expand All @@ -36,18 +41,22 @@ function getNextElement(element) {
}

// Find the previous element in an in-order traversal of a tree of nodes.
function getPreviousElement( element ) {
export function getPreviousElement(element) {

if (!element) {
return null;
}

// The previous element is either this one's previous sibling
var previouselement = null;
if (element.previousSibling) {
previousElement = element.previousSibling;
var previousElement = null;
if (element.previousElementSibling) {
previousElement = element.previousElementSibling;
}

// ...or its parent
else {
previousElement = element.parentElement;;
previousElement = element.parentElement;
}

return previousElement;
}
}