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| ==Adding URL links to Track Details Pages==
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| One or more URL links can be added to details pages using trackDb settings. In ~/kent/src/hg/hgc/hgc.c, functions are created that print the details pages specific for each track.
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| * In order to print a custom URL specified in trackDb, the function, printCustomUrl() may be used. printCustomUrlWithLabel() can be used to add a URL and a label that are specified in trackDb.
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| e.g. for human vegaGene
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| hgwdev> cd ~/kent/src/hg/makeDb/trackDb/human
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| hgwdev> vi trackDb.ra
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| * In the track entry for the Bertone Yale TAR track (yaleBertoneTars), there is a url trackDb setting:
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| url http://dart.gersteinlab.org/cgi-bin/ar/lookup.cgi?acc=$$
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| * The $$ represents the location where the item name is inserted in the URL.
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| * NOTE: The track item name may not be used to construct the URL. If another name/idnentifier is used that is stored in a database table then a trackDb setting (idInUrlSql) can specify the mySQL statement used to select the name of the item to be used for the URL. e.g. for the SIB Alt-Splicing track, the following trackDb settings are used for the URL:
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| url http://www.isrec.isb-sib.ch/cgi-bin/tromer/tromergraph2draw.pl?species=H.+sapiens&tromer=$$
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| urlLabel SIB link:
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| idInUrlSql select name from sibTxGraph where id=%s
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| * The label for the link is specified in the trackDb.ra using the urlLabel setting e.g.
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| urlLabel Yale DART Link:
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| * On the details page for a track item, the item is a hyperlink that links to the external Yale database:
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| Yale DART Link: 17438 [http://dart.gersteinlab.org/cgi-bin/ar/lookup.cgi?acc=17438]
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| * Multiple URLs may be specified for a track. For subsequence urls, the numbered suffix is used to specify the URLs,
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| e.g. url2, url3,
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| and the corresponding urlLabel settings are e.g. url2Label, url3Label. It is assumed that for urlN, the corresponding label setting is urlNLabel. e.g. in the sno/miRNA track (wgRna) entry in the human trackDb.ra, there are 2 urls specified:
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| urlLabel Laboratoire de Biologie Moléculaire Eucaryote:
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| url http://www-snorna.biotoul.fr/plus.php?id=$$
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| url2Label The miRNA Registry:
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| url2 http://microrna.sanger.ac.uk/cgi-bin/sequences/mirna_entry.pl?id=$$
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| * For the sno/miRNA track, the doWgRna() function picks a url depending on the "type" of the sno/miRNA item.
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| [[Category:Browser QA]]
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