This is a migrated thread and some comments may be shown as answers.

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

4 Answers 127 Views

General Discussions

This is a migrated thread and some comments may be shown as answers.

Wei asked on 10 Dec 2008, 04:05 PM

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());   
        
                        }  
        
                    }  
        
                }  
        
            }

4 Answers, 1 is accepted

answered on 22 Dec 2008, 03:23 AM

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

Accepted