<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Capability detection (rewritten)</title>
</head>
<body>
<p style="margin-bottom:2em;padding-bottom:0.33em;border-bottom:1px dotted #aaa">
Rewritten version of a script presented in
<a href="http://dev.opera.com/articles/view/using-capability-detection/" title="Article on Dev.Opera">
Using capability detection
</a>
article
</p>
<script type="text/javascript">
// If the browser does not support the navigator object we will make one
if (!window.navigator) {
window.navigator = new Object();
}
// Capability: DOM generation "0", e.g. accessing images, links and form elements
// If you really need this you are encouraged to enhance these tests..
navigator.capDOM0 = !!(
document.images &&
document.links);
// Capability: DOM generation "0.5", the browser-proprietary APIs of Netscape 4 and IE 4. Deprecated!
navigator.capOldDOMIE = !!(
document.all &&
document.all.item &&
document.all.urns &&
document.all.namedItem &&
document.all.tags &&
document.all.tags('body'));
// I don't know enough about document.layers DOM to truly test for it.
navigator.capOldDOMNN = !!(document.layers);
// Capability: DOM generation "2", e.g. accessing any element on the page, creating elements, changing contents
// You are encouraged to add in-depth tests for other parts of the DOM2 specification that your scripts depend on
navigator.capDOM2 = !!(
document.createElement &&
document.createElement('p') &&
(document.createElement('p')).appendChild);
// Capability: DOM generation "2" document traversal
/* navigator.capDOM2Traversal = !!(
document.createNodeIterator &&
document.createNodeIterator(document.body, 1, null, false) &&
document.createNodeIterator(document.body, 1, null, false).nextNode);
*/
// Capability: DOM generation "3" approach to loading / serializing data
navigator.capDOM3LS = !!(
document.implementation &&
document.implementation.createLSParser &&
document.implementation.createLSParser(1, null) &&
document.implementation.createLSParser(1, null).parse);
// Capability: HTML element prototypes
navigator.capElementPrototypes = !!(typeof HTMLElement != 'undefined' && HTMLElement.prototype);
// Capability: text selection manipulation in forms
navigator.capTextSelection = false;
if (navigator.capDOM2) {
temp = document.createElement('textarea');
navigator.capTextSelection = !!(temp.setSelectionRange || temp.createTextRange);
}
// Capability: wysiwyg editing
navigator.capWYSIWYGedit = !!(document.execCommand || document.designMode);
// Capability: VBScript
navigator.capVBScript = false;
document.open();
document.write('<scr' + 'ipt type="text/vbscript">navigator.capVBScript = True</scr' + 'ipt>');
document.close();
// Note: in an XHTML document you need to use DOM methods rather than document.write
// Capability: plugin detection through navigator.plugins
navigator.capNPPluginDetect = !!(navigator.plugins && navigator.plugins.length);
// Capability: define getters and setters
navigator.capDefineGetSet = !!(window.__defineGetter__);
// Capability: CSS behaviors
var tmpdiv = document.createElement('div');
tmpdiv.innerHTML = '<a style="behavior:url(#default#homepage)"></a>';
navigator.supportsBehaviors = (typeof tmpdiv.firstChild.style.behavior != 'undefined');
// Capability: use try...catch.
// This must be last because browsers that do not support try...catch may terminate script here
navigator.capTryCatch = false;
eval('try{ navigator.capTryCatch = true; }catch(e){}');
</script>
<script type="text/javascript">
// Capability: request data from server
// Note: Depends on try...catch support, so we do this test in a separate SCRIPT tag or file
navigator.capDataRequests = !!(
(window.XMLHttpRequest &&
new XMLHttpRequest() &&
new XMLHttpRequest().open) ||
(window.ActiveXObject &&
(function ( progIDs ){
var test = function( progIDs ) {
try {
return new ActiveXObject(progIDs.pop());
} catch(e) {
return (progIDs.length) ? test(progIDs) : false;
}
}
return test(progIDs);
})(['Microsoft.XMLHTTP', 'MSXML2.XMLHTTP'])
));
</script>
<script type="text/javascript">
// Show all built-in and custom navigator properties..
for (var prop in navigator) {
document.write('navigator.<b>' + prop + '</b>: ' + navigator[ prop ] + '<br>');
}
</script>
</body>
</html>
) is private.
