Hello Eric,

The url attribute should be working. Are you following this syntax?

http://genome.ucsc.edu/goldenPath/help/hgTracksHelp.html#TRACK

url=<external_url> - Defines a URL for an external link associated with 
this track. This URL will be used in the details page for the track. Any 
'$$' in this string this will be substituted with the item name. There 
is no default for this attribute.

Using example 5 from the FAQ above with slight modifications, the format 
would be like this (below). When you paste into the Custom track 
submission form, make certain that all track line attributes are on a 
single line (remove newlines).

Use hg18.

browser position chr7:127471196-127495720
browser hide all
track name="ItemRGBDemo" description="Item RGB demonstration" 
visibility=2 url=http://maps.google.com/
chr7    127471196  127472363  Pos1  0  +  127471196  127472363  255,0,0
chr7    127472363  127473530  Pos2  0  +  127472363  127473530  255,0,0
chr7    127473530  127474697  Pos3  0  +  127473530  127474697  255,0,0
chr7    127474697  127475864  Pos4  0  +  127474697  127475864  255,0,0
chr7    127475864  127477031  Neg1  0  -  127475864  127477031  0,0,255
chr7    127477031  127478198  Neg2  0  -  127477031  127478198  0,0,255
chr7    127478198  127479365  Neg3  0  -  127478198  127479365  0,0,255
chr7    127479365  127480532  Pos5  0  +  127479365  127480532  255,0,0
chr7    127480532  127481699  Neg4  0  -  127480532  127481699  0,0,255

After loading, click on an item, and on the description page will be 
"Outside Link: <name>" where name is a hyperlink. The example goes to 
google maps just as a demonstration. When you build this, the variable 
$$ can be added to the url to make it item name-specific.

Please test the example and then your own dataset. If your dataset still 
has track line url attribute problems, we would be interested in 
viewing. Create a small sample, save into a Session, then send the 
Session link (link obtained from inside the Session tool, not just the 
url of the browser page) and we can provide feedback. Please reply back 
to the mailing list (dummy data/url is OK, as long as the formats and 
other settings are the same as the real data with problems).

http://genome.ucsc.edu/goldenPath/help/hgTracksHelp.html#Sessions

Thank you,
Jennifer

---------------------------------
Jennifer Jackson
UCSC Genome Informatics Group
http://genome.ucsc.edu/

On 5/5/10 7:48 AM, Eric Fournier wrote:
> Greetings,
>
> I'm trying to display a custom track where clicking each individual items 
> within the track leads to a documentation page specific to said items, much 
> like how gene tracks are displayed, where clicking on an individual gene 
> brings up a specific gene-card.
>
> I've found a post from 2004 in this mailing list giving details on how this 
> could be done ( 
> https://lists.soe.ucsc.edu/pipermail/genome/2004-July/005185.html ). However, 
> this information is either not current or I'm not reading it correctly, as 
> I've been unable to make use of it to solve my problem. Namely:
>
> 1) I've found the "url" track attribute to be ignored. Other documentation 
> mentioned the htmlUrl attribute, but this one does not seem to expand the 
> variables mentionned in message I've linked to. For example, my current track 
> information is  "track name=myTestTrack description="Some FooBar'ed track" 
> visibility=2 htmlUrl=http://mydomain.com/$$.html";, and fails to load data 
> from a file named MyTrackItem.html.
>
> 2) It seems that the htmlUrl attribute causes the text content of the page to 
> be obtained and pasted in the description page, which makes it impossible to 
> put image data there. I guess if the variable expansion work, I can just use 
> this area to display an external link with richer data formatting options. 
> However, the very best would be if clicking on the item in the genome browser 
> itself linked directly to the external page. Is that possible? This point was 
> also touched in the message I linked, but no answers were provided.
>
> I'm trying to avoid having to mirror the UCSC Genome browser locally to 
> achieve this, but I can probably do it if it's absolutely necessary.
>
> Thanks a lot for any help,
> -Eric fournier
>
> _______________________________________________
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> https://lists.soe.ucsc.edu/mailman/listinfo/genome
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