a[i].getAttribute("href") is null in Firefox 3

[Wei]

umm... what is this error I see on every pages?

a[i].getAttribute("href") is null


It seems in this function: (line 33 is where it breaks)

	// Iterates through all the <a> links on a page and adds
	// them to the queue to be prefetched.
	function doEnhancedPrefetch(aEvent, pos) {
	// exit if enhanced prefetching is turned off
	// or if the site has opted out of prefetching
	if(!PreferencesService.getBoolPref("extensions.fasterfox.enhancedPrefetching")) return;
	// doc is document that triggered "onload" event
	var doc = aEvent.originalTarget;
	// if this isn't an http:// page, retun
	if (doc.location.href.indexOf("http://") != 0) return;
	// load whitelist
	var whitelist = PreferencesService.getCharPref("extensions.fasterfox.whitelist").split(",");
	var whitelistLen = whitelist.length;
	// find all links
	var a = doc.getElementsByTagName('a');
	var href, numLinksToPrefetch, i, j;
	// prefetch a max of 100 links
	numLinksToPrefetch = (a.length>100) ? 100 : a.length;
	// if its the first time, set the pos to 0,
	// if a pos was passed in, we'll start the for loop there instead
	if (pos == null || pos <=0) pos = 0;
	// iterate through the links
	mainLinkLoop:
	for (i=pos; i<numLinksToPrefetch; i++) {
	href = a[i].getAttribute('href').toLowerCase();
	// make sure there is a link
	if(href && href.length > 4) {
	// Don't prefetch links w/ query strings
	// or the same page we are on
	if(href.indexOf('?')>=0 || href == doc.location.href) continue;
	// Don't prefetch things that look like a logout link
	// Special thanks to b1naryb0y and Kai Risku for this bug fix
	if(href.indexOf('logout')>=0 || href.indexOf('logoff')>=0) continue;
	// Only prefetch static content, this causes dynamic pages to be ignored
	fileExtensionStartPos = href.length-4;
	if(!(href.indexOf('.htm') == fileExtensionStartPos
	|| href.indexOf('.html') == fileExtensionStartPos-1
	|| href.indexOf('.jpg') == fileExtensionStartPos
	|| href.indexOf('.gif') == fileExtensionStartPos
	|| href.indexOf('.png') == fileExtensionStartPos
	|| href.indexOf('.jpeg') == fileExtensionStartPos-1
	|| href.indexOf('.txt') == fileExtensionStartPos
	|| href.indexOf('.text') == fileExtensionStartPos-1
	|| href.indexOf('.xml') == fileExtensionStartPos
	|| href.indexOf('.pdf') == fileExtensionStartPos)) continue;
	// Don't prefetch whitelist links
	href = ff_GetAbsoluteUrl(href, doc.location.href);
	for(j=0; j<whitelistLen; j++) {
	if(whitelist[j].length > 0 && href.indexOf(whitelist[j]) >= 0) continue mainLinkLoop;
	}
	// test if site is opting out of prefetching
	var shouldOptOut = ff_IsSiteOptOut(href, aEvent, i);
	if(shouldOptOut) {
	continue;
	} else if (shouldOptOut == -1) {
	return;
	}
	try {
	PrefetchService.prefetchURI(ff_makeURI(ff_GetAbsoluteUrl(a[i].getAttribute('href'), doc.location.href)), ff_makeURI(doc.location.href), true);
	} catch(e) {
	//if(e.name != "NS_ERROR_ABORT") alert(ff_GetAbsoluteUrl(href, doc.location.href) + '\n' + e.toString());
	}
	}
	}
	}

[DGDev]

I have the same problem.
Have not yet pin-pointed whats causing it though. Strange it only exists with Firefox 3.

http://www.example.com/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ctl00_ScriptManager_HiddenField&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d3.5.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a8ac4a3ed-a467-4f19-a8ed-9270f6e4c6d6%3aadbe97d5%3a6a5df9aa%3bTelerik.Web.UI%2c+Version%3d2008.3.1105.35%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a99dd44ed-99f9-4eed-a93e-6ebfddaf3eb2%3afe8d4455%3a170a45d3%3adcf52240%3ac7991a52%3acc662d70%3a3e33fb52%3a9265f342%3a5f3d0562%3afe3916f2%3ab33f49a2

[Sebastian]

Hi guys,

Can you please verify that this issue appears under FireFox 3 browser only and prepare a working demo (using our RadScriptManager control) which replicates it? Thus we will be able to investigate the matter further and provide an accurate explanation/solution. You can attach the example to a regular support ticket in order to send it to us.

Kind regards,
Sebastian
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[Wei]

My problem is related to add-in FasterFox. With the removal of FasterFox the problem solved itself!

[DGDev]

Funny you should mention that, I just installed FasterFox today. I never saw any error before installing it, so this must be the cause.

If you disable "Enhanced Prefetching", you will not receive this error anymore.