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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
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* modification, are permitted provided that the following conditions are
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// DOMWalk - a benchmark for walking the DOM
//
// This benchmark tests different mechanisms for touching every element
// in a section of the DOM. The elements are created from JavaScript causing
// them to be pre-wrapped.
//
// Tests small iterations and large iterations to see if there is a difference.
// We use two mechanisms to walk the DOM, and then
// verify that both yield the same result.
var __num_nodes = 0;
// We create a table to iterate as part of this test.
// For now it's just a big table with lots of elements.
function DOMWalk_CreateTable(height, width) {
var table = document.getElementById("fake_dom");
if (table) {
// clear out existing table
while (table.rows.length > 0)
table.deleteRow(0);
} else {
var doc = document;
table = doc.createElement("table");
table.id = "fake_dom";
table.border = 1;
for (var row = 0; row < height; row++) {
var row_object = doc.createElement("tr");
for (var column = 0; column < width; column++) {
var col_object = doc.createElement("td");
var text = document.createTextNode(row.toString() + "." + column.toString());
col_object.appendChild(text);
row_object.appendChild(col_object);
}
table.appendChild(row_object);
}
var content = document.getElementById("benchmark_content");
content.appendChild(table);
var html = content.innerHTML;
var width = content.clientWidth;
}
return table;
}
function DOMWalk_SetupSmall() {
// Creates a table with 100 nodes.
DOMWalk_CreateTable(10, 10);
}
function DOMWalk_SetupLarge() {
// Creates a table with 4000 nodes.
DOMWalk_CreateTable(200, 200);
}
// Walks the DOM via getElementsByTagName.
function DOMWalk_ByTagName(table) {
var items = table.getElementsByTagName("*");
var item;
var length = items.length;
for (var index = 0; index < length; index++)
item = items[index];
// Return the number of nodes seen.
return items.length;
}
function DOMWalk_ByTagNameDriver(loops) {
var table = document.getElementById("benchmark_content");
for (var loop = 0; loop < loops; loop++)
__num_nodes = DOMWalk_ByTagName(table);
}
function DOMWalk_ByTagNameSmall() {
// This test runs in a short time. We loop a few times in order to avoid small time measurements.
DOMWalk_ByTagNameDriver(1000);
}
function DOMWalk_ByTagNameLarge() {
DOMWalk_ByTagNameDriver(1);
}
function DOMWalk_Recursive(node) {
// Count Element Nodes only.
// IE does not define the Node constants.
var count = (node.nodeType == /* Node.ELEMENT_NODE */ 1) ? 1 : 0;
var child = node.firstChild;
while (child !== null) {
count += DOMWalk_Recursive(child);
child = child.nextSibling;
}
return count;
}
// Walks the DOM via a recursive walk
function DOMWalk_RecursiveDriver(loops) {
var table = document.getElementById("benchmark_content");
for (var loop = 0; loop < loops; loop++) {
var count = DOMWalk_Recursive(table) - 1; // don't count the root node.
if (count != __num_nodes || count === 0)
throw "DOMWalk failed! Expected " + __num_nodes + " nodes but found " + count + ".";
}
}
function DOMWalk_RecursiveSmall() {
// This test runs in a short time. We loop a few times in order to avoid small time measurements.
DOMWalk_RecursiveDriver(200);
}
function DOMWalk_RecursiveLarge() {
// Only iterate once over the large DOM structures.
DOMWalk_RecursiveDriver(1);
}
var DOMWalkTest = new BenchmarkSuite('DOMWalk', [
new Benchmark("DOMWalkByTag (100 nodes)", DOMWalk_ByTagNameSmall, DOMWalk_SetupSmall),
new Benchmark("DOMWalkRecursive (100 nodes)", DOMWalk_RecursiveSmall, DOMWalk_SetupSmall),
new Benchmark("DOMWalkByTag (4000 nodes)", DOMWalk_ByTagNameLarge, DOMWalk_SetupLarge),
new Benchmark("DOMWalkRecursive (4000 nodes)", DOMWalk_RecursiveLarge, DOMWalk_SetupLarge)
]);