Re: Setting attributes via DOM does not take effect

On Jan 9, 11:19 am, Boris Zbarsky <[email protected]> wrote:

I followed the documents you pointed out and Mozilla Dev center's
DOM:style page. I was able to access the stylesheet via the API.
However, when I went further to access cssRules on the stylesheet, I
got an error of 0x80004005. Here is the code snippet I have (in Java):

		nsIDOMWindow domWindow = webBrowser.getContentDOMWindow();

		nsIDOMDocument document = domWindow.getDocument();

		// Query nsIDOMDocumentStyle interface out of the regular
nsIDOMDocument.
		nsIDOMDocumentStyle documentStyle = (nsIDOMDocumentStyle)
document.queryInterface(nsIDOMDocumentStyle.NS_IDOMDOCUMENTSTYLE_IID);

		nsIDOMStyleSheetList styleList = documentStyle.getStyleSheets();

		nsIDOMStyleSheet styleSheet = styleList.item(0);

		// Query nsIDOMCSSStyleSheet interface out of nsIDOMStyleSheet
		nsIDOMCSSStyleSheet cssStyleSheet = (nsIDOMCSSStyleSheet)
styleSheet.queryInterface(nsIDOMCSSStyleSheet.NS_IDOMCSSSTYLESHEET_IID);

		// Every thing is fine until this point. Following call throw a
0x80004005 error.
		nsIDOMCSSRuleList ruleList = cssStyleSheet.getCssRules();

		nsIDOMCSSRule rule = ruleList.item(0);

		// rule will then be queried into nsIDOMCSSStyleRule and the
nsIDOMCSSStyleDeclaration property can be obtained to operate on the
actual css text.
		......


I can't figure out why the call failed. Is it not implemented? I went
through similar logic in JavaScript
(document.styleSheets[0].cssRules[0].style.color) on the same page and
it gave me the correct result. Do you see any problem in my logic? I
really appreciate your help.