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// An inefficient, but effective bubble sort
function sort(collection, key) {
var i, j;
var count = collection.length;
var parent, child;
for (i = count - 1; i >= 0; i--) {
for (j = 1; j <= i; j++) {
if (collection[j - 1][key] > collection[j][key]) {
// Move the item both in the local array and
// in the tree
child = collection[j];
parent = child.parentNode;
collection[j] = collection[j - 1];
collection[j - 1] = child;
parent.removeChild(child);
parent.insertBefore(child, collection[j]);
}
}
}
}
// Set user properties on the nodes in the collection
// based on information found in its children. For example,
// make a property "Author" based on the content of the
// "Author" element found in the childNode list of the node.
// This makes later sorting more efficient
function collectInfo(nodes, propNames) {
var i, j, k;
var ncount = nodes.length;
var pcount = propNames.length;
for (i = 0; i < ncount; i++) {
var node = nodes[i];
var childNodes = node.childNodes;
var ccount = childNodes.length;
for (j = 0; j < ccount; j++) {
var child = childNodes[j];
if (child.nodeType == Node.ELEMENT_NODE) {
var tagName = child.tagName;
for (k = 0; k < pcount; k++) {
var prop = propNames[k];
if (prop == tagName) {
node[prop] = child.firstChild.data;
}
}
}
}
}
}
var enabled = true;
function toggleStyleSheet() {
if (enabled) {
document.styleSheets[2].disabled = true;
} else {
document.styleSheets[2].disabled = false;
}
enabled = !enabled;
}
// XXX This is a workaround for a bug where
// changing the disabled state of a stylesheet can't
// be done in an event handler. For now, we do it
// in a zero-delay timeout.
function initiateToggle() {
setTimeout(toggleStyleSheet, 0);
}
var sortableProps = ["Author", "Title", "ISBN"];
var books = [];
// We uppercase the tagName as a workaround for a bug
// that loses the original case of the tag.
var bookset = document.getElementsByTagName("Book");
// We need to create a "non-live" array to operate on. Since
// we'll be moving things around in this array, we can't use
// the read-only, live one returned by getElementsByTagName.
for (var i = 0; i < bookset.length; i++) {
books[i] = bookset[i];
}
collectInfo(books, sortableProps);