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test_NodeIterator_basics_filters.xhtml
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test_NodeIterator_basics_filters.xhtml
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<html xmlns="http://www.w3.org/1999/xhtml">
<!-- NodeIterator basics and filters tests.
Originally written by Ian Hickson, Mochi-ified by Zack Weinberg.
This file based on 001.xml, 002.xml, and 010.xml from
http://hixie.ch/tests/adhoc/dom/traversal/node-iterator/
with some additional cases.
-->
<head>
<title>DOM Traversal: NodeIterator: Basics and Filters</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<p id="display"></p>
<div id="content" style="display: none">
<!-- comment -->
<?body processing instruction?>
</div>
<pre id="test">
<script class="testbody" type="text/javascript"><![CDATA[
function compare_arrays(e, f, label) {
var length = (e.length > f.length) ? e.length : f.length;
for (var i = 0; i < length; i += 1) {
if (e[i] > 0)
is(f[i], e[i], label + " - index " + i + ": ");
else
todo_is(f[i], -e[i], label + " - index " + i + ": ");
}
}
/** DOM Traversal: NodeIterator: Basics **/
// NOTE: If you change the document structure, you have to make sure
// the magic numbers in this array (and 'expected_f', below) match.
var expected = new Array(9, // document
1, // html
3, 8, // leading comment
3, 1, // head
3, 1, 3, // title
3, 1, // first script tag
3, 1, // stylesheet tag
3, // close head
3, 1, // body
3, 1, // p#display
3, 1, // div#content
3, 8, // comment
3, 7, // processing instruction
3, // close div
3, 1, // pre#test
3, 1, 4, // script and CDATA block
-3, -3, -3); // close close close
// these aren't there
// not sure why
var found = new Array();
var iterator = document.createNodeIterator(document,
NodeFilter.SHOW_ALL,
null);
var node;
// forwards
while (node = iterator.nextNode())
found.push(node.nodeType);
compare_arrays(expected, found, 'basics forward');
// backwards
found.length = 0;
while (node = iterator.previousNode())
found.unshift(node.nodeType);
compare_arrays(expected, found, 'basics backward');
/** DOM Traversal: NodeIterator: Filters **/
function filter(n) {
if (n.nodeType == 3) {
return NodeFilter.FILTER_SKIP;
} else if (n.nodeName == 'body') {
return NodeFilter.FILTER_REJECT; // same as _SKIP
}
return 1; // FILTER_ACCEPT
}
// Same warning applies to this array as to 'expected'.
var expect_f = new Array(9, // document
1, // html
8, // leading comment
1, // head
1, // title
1, // first script tag
1, // stylesheet tag
// body skipped
1, // p#display
1, // div#content
8, // comment
// processing instruction skipped
1, // pre#test
1, 4); // script and CDATA block
found.length = 0;
iterator = document.createNodeIterator(document, NodeFilter.SHOW_ALL,
filter);
// forwards
while (node = iterator.nextNode())
found.push(node.nodeType);
compare_arrays(expect_f, found, 'filtered forward');
// backwards
found.length = 0;
while (node = iterator.previousNode())
found.unshift(node.nodeType);
compare_arrays(expect_f, found, 'filtered backward');
function checkBadFilter(method, n) {
var iterator =
document.createNodeIterator(document, NodeFilter.SHOW_ALL,
function() {
if (n < 0)
iterator.detach();
return NodeFilter.FILTER_ACCEPT;
});
while (--n >= 0)
iterator.nextNode();
try {
iterator[method]();
ok(true, "Able to call " + method + " on a NodeIterator after calling no-op detach()");
} catch (x) { ok(false, x) }
}
checkBadFilter("nextNode", 2);
checkBadFilter("previousNode", 3);
(function() {
// Implementing the scenario outlined in
// http://bugzilla.mozilla.org/show_bug.cgi?id=552110#c4
var iterator = (function(filter) {
var grandparent = document.createElement("div"),
parent = document.createElement("span");
grandparent.appendChild(parent);
parent.appendChild(document.createElement("img"));
parent.appendChild(document.createElement("p"));
return document.createNodeIterator(grandparent,
NodeFilter.SHOW_ALL,
filter);
})(function filter(n) {
if (n.nodeName != "img")
return NodeFilter.FILTER_ACCEPT;
iterator.detach();
n.parentNode.parentNode.removeChild(n.parentNode);
// Drop any node references passed into this function.
for (var i = 0; i < arguments.length; ++i)
arguments[i] = null;
ok(!n, "arguments[0] = null should have nulled out n");
// Try to trigger GC.
var xhr = new XMLHttpRequest();
xhr.open("GET", location.href, false);
xhr.send();
return NodeFilter.FILTER_SKIP;
});
is(iterator.nextNode().nodeName, "div",
"iterator.nextNode() returned the wrong node");
is(iterator.nextNode().nodeName, "span",
"iterator.nextNode() returned the wrong node");
try {
var p = iterator.nextNode();
ok(false, "iterator.nextNode() should have thrown, but instead it returned <" + p.nodeName + ">");
} catch (x) { ok(true, x) }
})();
]]></script>
</pre>
</body>
</html>