33992680e6261bbca8c30b1a94e93e5118e809e9
larrym
  Sat Jan 1 16:23:34 2011 -0800
fix problem caused when cytoband track is visible
diff --git src/hg/js/hgTracks.js src/hg/js/hgTracks.js
index b09df83..ffa68a4 100644
--- src/hg/js/hgTracks.js
+++ src/hg/js/hgTracks.js
@@ -549,30 +549,31 @@
             offset = 1 - offset;
         return Math.round(offset * chr.size);
     }
     function convertFromBases(bases)
     {   // Simple utility to convert bases to pix
         var offset = bases/chr.size;
         if(chr.reverse)
             offset = 1 - offset;
         return Math.round(offset * chr.width) + chr.left;
     }
 
     function findDimensions()
     {   // Called at init: determine the dimensions of chrom from 'cytoband' map items
         var lastX = -1;
         $('.cytoBand').each(function(ix) {
+            if(this.coords) {
             var loc = this.coords.split(",");
             if(loc.length == 4) {
                 var myLeft  = parseInt(loc[0]);
                 var myRight = parseInt(loc[2]);
                 if( chr.top == -1) {
                     chr.left   = myLeft;
                     chr.right  = myRight;
                     chr.top    = parseInt(loc[1]);
                     chr.bottom = parseInt(loc[3]);
                 } else {
                     if( chr.left  > myLeft)
                         chr.left  = myLeft;
                     if( chr.right < parseInt(loc[2]))
                         chr.right = parseInt(loc[2]);
                 }
@@ -589,30 +590,31 @@
                             chr.beg = parseInt(pos[0]);
                     }
                     if( chr.end < parseInt(pos[1])) {
                         chr.end = parseInt(pos[1]);
                         if(lastX == -1)
                             lastX = myRight;
                         else if(lastX > myRight)
                             chr.reverse = true;  // end is advancing, but X is not, so reverse
                     } else if(lastX != -1 && lastX < myRight)
                         chr.reverse = true;      // end is not advancing, but X is, so reverse
 
                 }
             $(this).css( 'cursor', 'text');
             $(this).attr("href","");
             }
+            }
         });
         chr.size  = (chr.end   - chr.beg );
         chr.width = (chr.right - chr.left);
     }
 
     function findCytoBand(pxDown,pxUp)
     {   // Called when mouseup and ctrl: Find the bounding cytoband dimensions, both in pix and bases
         var cyto = { left: -1, right: -1, beg: -1, end: -1 };
         $('.cytoBand').each(function(ix) {
             var loc = this.coords.split(",");
             if(loc.length == 4) {
                 var myLeft  = parseInt(loc[0]);
                 var myRight = parseInt(loc[2]);
                 if(cyto.left == -1 || cyto.left > myLeft) {
                     if( isWithin(myLeft,pxDown,myRight) || isWithin(myLeft,pxUp,myRight) ) {