Patch for bug on some IE 5.0

[David]

Hello,

The tooltip does not work on some instances of IE5.0 and IE5.5 because the scripting engine does not understand the "non-greedy" operator in regular expressions. See the answer to the following post for more details on this : http://forum.mamboserver.com/showthread.php?t=7881

I have written the following patch to make the script work on all those instances of IE5 :

Change the 2 lines :
curNode.boHDR=getParam('(?:[^a-zA-Z]header|^header)',curNode.title);
curNode.boBDY=getParam('(?:[^a-zA-Z]body|^body)',curNode.title);

To :
curNode.boHDR=getParam('([^a-zA-Z]header|^header)',curNode.title);
curNode.boBDY=getParam('([^a-zA-Z]body|^body)',curNode.title);

It works here on IE5.0 and FF 1.0.7 ; but I haven't done comprehensive testing. Maybe some of the developers could tell us whether this patch has unwanted side effects ?

Thank you,
Anselm

[David]

Sorry - you also need to change :

if(res)
return res[1].replace('[[','[').replace(']]',']');
else
return '';

To

if(res)
return res[2].replace('[[','[').replace(']]',']');
else
return '';

In function getParam.

[olly]

Hi David,

Thanks for the updates. The ? here is not actually signifying a non greedy search - with regular expressions you can specify a non-capturing group. Thus when you take away the ? the group, which was previously not being captured, is now captured and you have to look at the second capture instead of the first, since the inside group is now causing a total of 2 captures. Either way I'm going to include this patch because IE 5.0 clearly doesn't understand non-capturing groups.

I really appreciate all the patches you have posted in this forum. I am in the process of updating the boxover script. Seeing as you take the effort to look into how everything works I'll go over my changes here.

I was noticing that often long pages taking a long time to load (and I'm in SA where connectivity is backwards at times, maybe you wouldn't notice this overseas) would not start displaying tooltips until the page had fully loaded - they would show the literal title contents before the page fully loaded.

Thus I have removed the scanDOM function and instead implemented a trigger based scanBO function. This way the boxover script does not need to be placed at the bottom of the page (there was a problem with this earlier because putting the script at the top of the page would trigger scanDOM function before the actual DOM has been constructed by the browser) and more importantly the page does not need to be fully loaded anymore. So I no longer parse the entire page to assign tooltips - rather tooltips are assigned to elements as they are encountered. There is also a variable storing tooltip status so elements don't need to be re-parsed to check for tooltips.

Anyhow I'm in the process of implementing the above changes.

Would be very interested to hear what you think.

Thanks for the interest you've expressed in this component!

[olly]

Also with this regex the non-capturing group is only used for header and body parameters because there was an anomolous case I had to cater for. This was when you has cssheader before header in the title attribute and it's contents would get captured for the header first. Thus I introduced the (?:[^a-zA-Z]header|^header) so that it would not match cssheader for header. Thus the update you posted above would work fine for the header and body attributes but getparam would capture incorrectly for other tooltip attributes.

I have thus modified getparam as follows

function getParam(param,list) {
	var reg = new RegExp('([^a-zA-Z]' + param + '|^' + param + ')\\s*=\\s*\\[\\s*(((\\[\\[)|(\\]\\])|([^\\]\\[]))*)\\s*\\]');
	var res = reg.exec(list);
	var returnvar;
	if(res)
		return res[2].replace('[[','[').replace(']]',']');
	else
		return '';
}

This extends handling the anomolous case with header and body to all attributes across the board so that there will always be a 2nd group to capture.

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