Hi,

I have a scenario where I need to plot hundreds of rectangles and 
each rectangle has two possible y values but all other attributes are 
static.  To save space I was hoping to add two attributes that could 
be swapped in response to events.  Does this make sense and what do 
you suggest as a method for swapping the two y attribute values?  
Would I have to loop over each element sequentially or is there a 
faster way?

Thanks, Simon

The markup would be something like this :

<?xml version="1.0" encoding="utf-8"?>
<svg  id="rects"
  width="100%" height="100%"
  xmlns="http://www.w3.org/2000/svg";
  xmlns:swap="http://www.xxx.com/ns";>
  <rect attrib:title="R1" attrib:y1="20" attrib:y2="35" x="14" y="50" 
width="3" height="31"/>
  <rect attrib:title="R2" attrib:y1="30" attrib:y2="35" x="12" y="20" 
width="3" height="11"/>
  <rect attrib:title="r1" attrib:y1="20" attrib:y2="30" x="140" 
y="20" width="3" height="21"/>
  <rect attrib:title="R3" attrib:y1="40" attrib:y2="30" x="21" y="10" 
width="3" height="1"/>
  <rect attrib:title="Rn" attrib:y1="20" attrib:y2="30" x="140" 
y="20" width="3" height="21"/>.
</svg>


The script could be something like :

var r=document.getElementById('rects')
var coll=r.getElementsByTagNameNS
('http://www.w3.org/2000/svg', 'rect')
var i=0
var elm;
while(elm=coll.item(i++)){
    elm.setAttributeNS(null,'y',elm.getAttributeNS
('http://www.xxx.com/ns,'y'));
}




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