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clarify containsElement

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Avital Oliver
2013-08-08 15:32:12 -07:00
parent b5e483f0f8
commit 04dc8bd67e
1 changed files with 18 additions and 14 deletions
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32
packages/ui/base.js
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@@ -836,6 +836,7 @@ _extend(UI.Component, {
this.insertBefore(childOrDom, after.nextSibling, parentNode);
},
// Is `elem` between `this.firstNode()` and `this.lastNode()`?
containsElement: function (elem) {
if (elem.nodeType !== 1)
throw new Error("containsElement requires an Element node");
@@ -845,23 +846,26 @@ _extend(UI.Component, {
self._requireNotDestroyed();
var firstNode = self.firstNode();
var prevNode = firstNode.previousSibling;
var nextNode = self.lastNode().nextSibling;
// because we can only do comparisons on elements, find
// some elements.
while (prevNode && prevNode.nodeType !== 1)
prevNode = prevNode.previousSibling;
while (nextNode && nextNode.nodeType !== 1)
nextNode = nextNode.nextSibling;
var lastNode = self.lastNode();
if (! elementContains(firstNode.parentNode, elem))
return false;
// element must not be "at or before" prevNode
if (prevNode && compareElementIndex(prevNode, elem) >= 0)
// because compareElementIndex only works on elements, we find
// previous and next element siblings. (previousSiblingElement and
// nextSiblingElement do the same thing but they neither work on
// IE8 nor are they available on text nodes)
var prevElem = firstNode.previousSibling;
while (prevElem && prevElem.nodeType !== 1)
prevElem = prevElem.previousSibling;
var nextElem = lastNode.nextSibling;
while (nextElem && nextElem.nodeType !== 1)
nextElem = nextElem.nextSibling;
// element must not be "at or before" prevElem
if (prevElem && compareElementIndex(prevElem, elem) >= 0)
return false;
// element must not be "at or after" nextNode
if (nextNode && compareElementIndex(elem, nextNode) >= 0)
// element must not be "at or after" nextElem
if (nextElem && compareElementIndex(elem, nextElem) >= 0)
return false;
return true;
},