[clug-progsig] Javascript, again.

[John E. Jardine]

Hey Shawn,

You're up late again :)

You never did send me those log files.

Cheers,
J.J.
----- Original Message ----- 
From: "Shawn" <sgrover at open2space.com>
To: "CLUG PROGSIG" <clug-progsig at clug.ca>
Sent: Tuesday, October 10, 2006 10:23 AM
Subject: Re: [clug-progsig] Javascript, again.


> With XML, the natural assumption is that you can do something like this:
>
> var myRequestor = getXMLHTTPrequestObj();
> . . .
> var myXML = myRequester.responseXML;
>
> And then use the xml elements normally.
>
> However, I have found that this does not work, especially with IE.
> Instead, do something like this:
>
> var myXML = myRequester.responseXML.getElmentsByTagName("response");
>
> Now, the myXML variable will represent an array of "response" elements
> (usually only one element, unless you are not requesting the root...).
> Of course "response" would correspond to whatever XML tag names you are
> using.
>
> Using this technique - getElementsByTagName() or getElementById() -
> works fine in IE and FF.  In IE, it eliminates half the response
> problems.  (This threw me for about a week until I noticed the subtle
> difference in approaches...)
>
> HTH
>
> Shawn
>
> Nick Wiltshire wrote:
>> If I am ever able to write javascript it might be a miracle. It seems as
>> though I can't do the most trivial thing.
>>
>> I'm attempting to write a (reasonably) generic function to take XML 
>> returned
>> from the XMLHttpRequest object and use DOM functions to insert it. Sounds
>> easy, right? :)
>>
>> The XML I am parsing is actually XHTML wrapped in proper XML fashion. It 
>> is
>> not an entire XHTML document, but a fragment (specifically a div) which I 
>> want
>> to append to the
>> page. I have validated the XML so I know that's not my issue.
>>
>> But, I'm stuck. For some reason my function will only return text and 
>> image
>> nodes and I can't figure out why. It traverses the XML tree completely &
>> correctly, but won't return the node unless it's text, or incorrectly
>> returns a text node, I can't figure out which. However, the final 
>> iteration
>> does return a div element, which is the desired behaviour. The returned 
>> div
>> element is completely empty.
>>
>> Here's my function. The error_handler is for later consideration.
>>
>> function XML2DOM(xml_obj, error_handler)
>>         {
>>         var dom_obj = false;
>>         var child_node;
>>         var child;
>>
>>         for(i in xml_obj.childNodes)
>>                 {
>>                 child_node = xml_obj.childNodes[i];
>>                 switch(child_node.nodeType)
>>                         {
>>                         case 1:
>>                                 //alert(child_node.nodeName);
>>                                 dom_obj =
>> document.createElement(child_node.nodeName);
>>
>>                                 child = XML2DOM(child_node, 
>> error_handler);
>>                                 alert(child);
>>                                 if(child)
>>                                         {
>>                                         dom_obj.appendChild(child);
>>                                         }
>>                         break;
>>                         case 3:
>>                                 dom_obj =
>> document.createTextNode(child_node.nodeValue);
>>                         break;
>>                         case 2:
>>                         case 4:
>>                         case 5:
>>                         case 6:
>>                         case 7:
>>                         case 8:
>>                         case 9:
>>                         case 10:
>>                         case 11:
>>                         case 12:
>>                                 alert("Warning: XML2DOM encountered an 
>> unknown
>> nodeType: " +
>> child_node.nodeType);
>>                         break;
>>                         default:
>>                         break;
>>                         }
>>                 }
>>
>>         return dom_obj;
>>         }
>>
>>
>> Hopefully that's enough detail. This function is a long way from 
>> complete,
>> and may even be plain dumb, but I want the very basic functionality 
>> first.
>> The warning isn't put in the default switch case section because there's 
>> a
>> bunch of undefined nodes, dunno what that's about.
>>
>> Thanks,
>> Nick
>
>
>
>
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