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

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Wei
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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());   
            }  
        }  
    }  
 
}  
 

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DGDev
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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
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Sebastian
Telerik team
answered on 22 Dec 2008, 07:41 AM
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.
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Wei
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answered on 22 Dec 2008, 02:30 PM
My problem is related to add-in FasterFox. With the removal of FasterFox the problem solved itself!
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DGDev
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answered on 22 Dec 2008, 07:15 PM
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.
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Sebastian
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Wei
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