prependclass: test first whether the class isn't yet active

[Jan831 <jan831@…>]

currently dojo.html.prependClass(node, classStr) prepends classStr to the current Class-attribute of node.

It might be better to have some test first check whether node hasn't already the classStr and remove it in that case, before prepending classStr

it would be in that case like: give an existing class the highest precidence, without having it multiple times in the list of class names

[Jan831 <jan831@…>]

adding this extra test, this would be the new function (in src/html.js)

dojo.html.prependClass = function(node, classStr){
	if (dojo.html.hasClass(node, classStr)) {
	  dojo.html.removeClass(node, classStr, false);
	}
	classStr += " " + dojo.html.getClass(node);
	return dojo.html.setClass(node, classStr);
}

[Adam Peller]

method does not exist in 0.9