George Armhold wrote:
Can someone please explain the difference between Element.setAttribute and Element.setAttributeNS(), as it affects Batik? My code loads a document into the canvas and performs various modifications to the DOM, adding various <g>, <rect> and <line> Elements. I notice that through accretion, my code is using all of the following in various places:
e.setAttribute(attribName, attribValue); e.setAttributeNS(svgNS, attribName, attribValue); e.setAttributeNS(null, attribName, attribValue);
Wow! :)
It seems that some attribs need the SVG namespace (e.g. the xml "id" attrib.) Others are happy with no namespace (<line> x/y coords.) Yet others seem to need the null namespace (the width/height of the <svg> element.) Are there some general rules about when & how to supply a namespace for attributes?
I think you have fooled your self. For all intents and purposes _nothing_ uses e.setAttributeNS(svgNS, ...) - I don't know where you got the impression you needed to do this for 'id' you do not. For the 'href' attribute (use, image, etc) you must use setAttributeNS(xlinkNS, "href", ...) - this is closely related to 'id' perhaps this confused you?
In Batik setAttribute(attribName, attribValue) is exactly the same as setAttributeNS(null, attribName, attribValue).
Vincent tells me that the "correct" one of setAttribute vs setAttributeNS(null...) is setAttributeNS(null,...) [I am not as sure since in some bindings there may be no 'null' value for DOMString - i.e. C++].
If you can provide a small reproducible example to the contrary I would be very interested in seeing it but I do a fair amount of this stuff and I always just use 'setAttribute' (except of course for 'xlink:href').
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