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Jquery uses the rnocache regex for determining problematic html tags for both caching and for the use of innerHtml. The problem is that these two purposes share very little overlap, and conflating them results in not using innerHtml in places where it's perfectly safe, and much faster.
For discussion and bug see:
To implement the test, I extend jquery with a .html2() function which is a direct copy of the 1.5.1 version of .html(), but add a new regex test:
rnoInnerhtml = /<script|<style/i
which I use in place of rnocache within the .html. This change allows me to then copy a select box using innerHTML rather than .empty().append() which results in some rather large speed increases.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div>Original: <div id="source"><select id="test_select" name="test_select">
<option label="1">0</option>
<option label="1">1</option>
<option label="2">2</option>
<option label="3" selected="selected">3</option>
<option label="4">4</option>
<option label="1">5</option>
<option label="2">6</option>
<option label="3">7</option>
<option label="4">8</option>
<option label="1">9</option>
</select>
</div></div>
Following two selects should be identical:
<div>Unoptimized copy: <div id="destination"></div></div>
<div>Optimized copy:<div id="destination2"></div></div>
<script>
var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
rleadingWhitespace = /^\s+/,
rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/ig,
rtagName = /<([\w:]+)/,
rtbody = /<tbody/i,
rhtml = /<|&#?\w+;/,
rnoInnerhtml = /<script|<style/i,
rnocache = /<(?:script|object|embed|option|style)/i,
// checked="checked" or checked (html5)
rchecked = /checked\s*(?:[^=]|=\s*.checked.)/i,
wrapMap = {
option: [1, "<select multiple='multiple'>", "</select>"],
legend: [1, "<fieldset>", "</fieldset>"],
thead: [1, "<table>", "</table>"],
tr: [2, "<table><tbody>", "</tbody></table>"],
td: [3, "<table><tbody><tr>", "</tr></tbody></table>"],
col: [2, "<table><tbody></tbody><colgroup>", "</colgroup></table>"],
area: [1, "<map>", "</map>"],
_default: [0, "", ""]
};
wrapMap.optgroup = wrapMap.option;
wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
wrapMap.th = wrapMap.td;
// IE can't serialize <link> and <script> tags normally
if (!jQuery.support.htmlSerialize) {
wrapMap._default = [1, "div<div>", "</div>"];
}
jQuery.fn.extend({
html2: function(value) {
if (value === undefined) {
return this[0] && this[0].nodeType === 1 ? this[0].innerHTML.replace(rinlinejQuery, "") : null;
// See if we can take a shortcut and just use innerHTML
} else if (typeof value === "string" && !rnoInnerhtml.test(value) && (jQuery.support.leadingWhitespace || !rleadingWhitespace.test(value)) && !wrapMap[(rtagName.exec(value) || ["", ""])[1].toLowerCase()]) {
value = value.replace(rxhtmlTag, "<$1></$2>");
try {
for (var i = 0, l = this.length; i < l; i++) {
// Remove element nodes and prevent memory leaks
if (this[i].nodeType === 1) {
jQuery.cleanData(this[i].getElementsByTagName("*"));
this[i].innerHTML = value;
}
}
// If using innerHTML throws an exception, use the fallback method
} catch (e) {
this.empty().append(value);
}
} else if (jQuery.isFunction(value)) {
this.each(function(i) {
var self = jQuery(this);
self.html(value.call(this, i, self.html()));
});
} else {
this.empty().append(value);
}
return this;
}
});
var template = $("#source").html();
</script>Ready to run.
| Test | Ops/sec | |
|---|---|---|
| using standard nocache | | ready |
| using innerHTML optimized regex | | ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.