[Qt-interest] How to load page from Qt resource with AJAX?

Fri Nov 12 08:27:01 CET 2010

Hi,

QWebView's setHtml results in blank scheme for Security Origin, and 
load(resourceUrl) - "qrc:" scheme.

Assistant says:

By default local schemes like file:// and qrc:// are concidered to be in the 
same security origin, and can access each other's resources. You can add 
additional local schemes by using QWebSecurityOrigin::addLocalScheme(), or 
override the default same-origin behavior by setting 
QWebSettings::LocalContentCanAccessFileUrls to false.

And it seems to me that blank scheme was not mentioned there)))). OK, now 
it's clear.

> Hi,
> One cannot access arbitrary sites and resources using xmlhttp; only the
> resources from the same origin. I am pretty sure that is why your first
> case did not work. See "same origin policy" (
> http://en.wikipedia.org/wiki/Same_origin_policy). There is a patch to
> disable this but it's not in mainline yet -
> https://bugs.webkit.org/show_bug.cgi?id=45436.
> 
> Girish
> On Fri, Nov 12, 2010 at 8:31 AM, sherzod_ <sherzod.l at mail.ru> wrote:
> 
>> Hi, Girish
>>
>> Excellent!)) Thank you, you pointed me the right way. Let me try to
>> explain why.
>>
>> By webView.loadFromResource(":/root/index.html"); I meant something like
>> this:
>>
>> //------------------------- c++ -------------------------------------
>> QResource page(":/elinksetup/index.html");
>> QString content = QString(QByteArray((const char*)page.data(),
>>                        page.size()));
>> QWebView webView.setHtml(content);
>> // this works, index.html is loaded, and I can see it :)
>> //-------------------------------------------------------------------
>>
>> I can't remember why I did so. But after I changed it to
>>
>> //------------------------- c++ -------------------------------------
>> QWebView webView;
>> webView.load(QUrl("qrc:/root/index.html"));
>> //-------------------------------------------------------------------
>>
>> all stuff seems to work). So thank you again.
>>
>> But I still wonder why in the first case AJAX doesn't work? Maybe
>> something wrong with baseUrl? The absolute path always used though... And
>> the LocalContentCanAccessRemoteUrls option is on. Well OK, maybe I should
>> learn about setHtml's specificity more.
>>
>> > Hi Sherzod,
>> > What does webView.loadFromResource(":/root/index.html"); do? QWebView
>> > has no such method.
>> >
>> > qrc:/root/index.html and qrc:/root/sayHello.html is the correct way to
>> > address the resources.
>> >
>> > What you are doing below should work. All network requests go through
>> QNAM
>> > and the file backend supports qrc: scheme. I can give you a few
>> > debugging hints:
>> > 0. Does webView.load("qrc:/root/index.html") load index.html? If not
>> > you might need a Q_INIT_RESOURCE in your main app. Since the resource
>> > is in a dll and the dll maybe dynamically initialized, the resources
>> > are probably not registered wit Qt yet. Does it work if you move the
>> > resource files to the main application?
>> > 1. If index.html loads, then you should be able to issue a request
>> > as .load("sayHello.html");. This will at least eliminate the
>> > cross-origin request scenario.
>> >
>> > Girish
>> >
>> > On Thu, Nov 11, 2010 at 2:20 PM, sherzod_ <sherzod.l at mail.ru> wrote:
>> >
>> >> Hello.
>> >>
>> >> Let us have a resource "qrc:/root/sayHello.html" with a simple content
>> >> <p>Hello, world!</p>.
>> >>
>> >> I need to load the content of the resource to some <div> element by
>> means
>> >> of
>> >> ajax, wich runs in a context of some other page in a QWebView.
>> >>
>> >> ---------------------------------------------------------------
>> >>
>> >> <!-- qrc:/root/sayHello.html -->
>> >> <p>Hello, world!!!</p>
>> >>
>> >> ---------------------------------------------------------------
>> >>
>> >> <!-- qrc:/root/index.html -->
>> >> <!DOCTYPE somekindofhtml>
>> >> <html>
>> >>
>> >> <script type="text/javascript">
>> >>        /* use JQuery */
>> >>        $(document).ready(function (){
>> >>                $("#board")
>> >>                /* this doesn't work */
>> >>                .load("qrc:/root/sayHello.html");
>> >>        });
>> >> </script>
>> >>
>> >> <body>
>> >>        <div id="board"></div>
>> >> </body>
>> >> </html>
>> >>
>> >> ---------------------------------------------------------------
>> >> // c++ code
>> >> QWebView webView;
>> >> webView.loadFromResource(":/root/index.html"); // Let it be
>> >>
>> >>
>> >> extra:
>> >>        tried all combinations of qrc, :, /, //, ///
>> >>        resource is in dll wich i d-ly load at runtime via plugin api
>> >>
>> >> How to do it correct?
>> >> i'll be glad to any suggestions.
>> >>
>> >> _______________________________________________
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>> >> Qt-interest at trolltech.com
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>> >>
>>
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