Hi Nevo:
Thanks your response.Through that link i understand how to create a
new StyleSheet in javascript.
Besides understanding this, but i also want to know webkit why not
support script "var a = new StyleSheet;",how can i change some c/c++ codes
in webkit to let it support this script.
Best Regards.
Suk
2009/6/5 Nevo <[email protected]>
> hi:
> I havn't used the StyleSheet object like in this way ,so here's my guess :
> The stylesheet is usually defined in server side ,people usually retrieve
> stylesheet via DOM StyleSheetObject (document.styleSheets). If you wanna
> create a new StyleSheet in your javascript. you probably may look at this
> http://eightpence.com/creating-new-css-stylesheets-with-javascript/
>
> Nevo
>
>
> 2009/6/5 Suk Zhong <[email protected]>
>
>> Hi All:
>> We're trying to extend WebKit dom js binding.We have some questions.
>>
>> in DOMWindow.idl having the following code:
>> attribute StyleSheetConstructor StyleSheet;
>> attribute [JSCCustomGetter] XMLHttpRequestConstructor XMLHttpRequest;
>>
>> and we find class JSXMLHttpRequestConstructor has function
>> getConstructData, while JSStyleSheetConstructor doesn't have function
>> getConstructData.
>>
>> if test the following js script:"var a = new XMLHttpRequest;", it's
>> ok;but "var a = new StyleSheet;", it'll throw an exception.
>>
>> and we trac this problem to Interpreter::privateExecute() and
>> JSValuePtr::getConstructData function
>>
>> inline ConstructType JSValuePtr::getConstructData(ConstructData&
>> constructData)
>> {
>> return JSImmediate::isImmediate(asValue()) ? ConstructTypeNone :
>> asCell()->getConstructData(constructData);
>> }
>> and we know this function returns ConstructTypeNone for
>> JSStyleSheetConstructor object, ConstructTypeHost for
>> JSXMLHttpRequestConstructor object;
>>
>> JSStyleSheetConstructor object and JSXMLHttpRequestConstructor object
>> are returned by the same template function getDOMConstructor.
>>
>> our questions are:
>>
>> 1.why it has this return?
>> 2.which codes make the two object have different immediate value?
>> 3.some people can explain the whole role of class JSImmediate?
>> 4.our trac maybe be not correct,who can explain why newing StyleSheet
>> has exception and newing XMLHttpRequest is OK?
>>
>> Thanks and Best Regards
>>
>> Suk
>>
>> _______________________________________________
>> webkit-dev mailing list
>> [email protected]
>> http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
>>
>>
>
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