Re: [webkit-dev] KJS::JSObject question
Hello, Having read through the following document Using JavaScript From Objective-C: http://developer.apple.com/documentation/AppleApplications/Conceptual/SafariJSProgTopics/Tasks/ObjCFromJavaScript.html#//apple_ref/doc/uid/30001215-BBCBFJCD It seems that the method: WebView::windowScriptObject would be useful to achieve what I wish to do (add a custom JavaScript object). However looking at the source code, it is not implemented on windows: http://trac.webkit.org/browser/trunk/WebKit/win/WebView.cpp#L2709 On Sun, May 17, 2009 at 6:30 PM, Darin Adler da...@apple.com wrote: On May 15, 2009, at 7:35 AM, Jack Wootton wrote: 4. Create the context: JSGlobalContextRef context = JSGlobalContextCreate(globalObjectClass); You will only do this if you’re using JavaScript outside of a web page. If you want to do this in conjunction with WebKit you’ll need to get the context from WebKit APIs. On Mac OS X the relevant API is -[WebFrame globalContext]. 1. Who should share the context? Is a single context used for a single webpage / frame? See my answer above. 2. Where do I define the class that will actually handle the implementation of any methods on my new object? I don’t understand the “where” question. Do it wherever makes sense in your program, and call JSClassCreate. Then when it's time to make an object, pass the JSClassRef to JSObjectMake. 3. The object has been made using JSObjectMake, but how is it added to WebKit? A common thing to do is to create an object and then put it in a property of the window object, which is the global object inside the web browser. That’s done on Mac OS X by implementing the webView:windowScriptObjectAvailable: method of the frame load delegate. The window script object is a WebScriptObject, and you can get the JSObject version of it by calling the JSObject method on it. Then you can set your object as a property of the window object with the JSObjectSetProperty function. -- Darin -- Regards Jack ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] KJS::JSObject question
On May 15, 2009, at 7:35 AM, Jack Wootton wrote: 4. Create the context: JSGlobalContextRef context = JSGlobalContextCreate(globalObjectClass); You will only do this if you’re using JavaScript outside of a web page. If you want to do this in conjunction with WebKit you’ll need to get the context from WebKit APIs. On Mac OS X the relevant API is - [WebFrame globalContext]. 1. Who should share the context? Is a single context used for a single webpage / frame? See my answer above. 2. Where do I define the class that will actually handle the implementation of any methods on my new object? I don’t understand the “where” question. Do it wherever makes sense in your program, and call JSClassCreate. Then when it's time to make an object, pass the JSClassRef to JSObjectMake. 3. The object has been made using JSObjectMake, but how is it added to WebKit? A common thing to do is to create an object and then put it in a property of the window object, which is the global object inside the web browser. That’s done on Mac OS X by implementing the webView:windowScriptObjectAvailable: method of the frame load delegate. The window script object is a WebScriptObject, and you can get the JSObject version of it by calling the JSObject method on it. Then you can set your object as a property of the window object with the JSObjectSetProperty function. -- Darin ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] KJS::JSObject question
OK. It seems I was on completely the wrong track. I was under the impression WebKit didn't have public and non public APIs as such, at least I haven't read anything to this effect. Where can I read what the published Vs non published APIs are? Or which ones I should use and which ones I shouldn't? On Thu, May 14, 2009 at 6:02 PM, Darin Adler da...@apple.com wrote: On May 14, 2009, at 8:03 AM, Jack Wootton wrote: My question: I do not understand how JSObject can be used to allow for the JavaScript syntax of : myNewJSObject.someObject.hello(). My first comment is that you should not be using JSObject directly. The right way to do this is to use the C-based public API of JavaScriptCore, which includes types like JSObjectRef. The JSObject internal interface is constantly being changed and not suitable for use outside the WebKit project. In JavaScript, if you want: a.b.c() to work, then the object a need a property b with a property c that is callable as a function. At each level, the object can just be a general purpose object with a property attached, which can be set up with functions like JSObjectSetProperty, or the property can come from the object’s prototype, or the property can be “built in” to the object, which can by done with JSClassCreate supplying a JSObjectGetPropertyCallback function. When it comes to the value of the property named c, to make something callable as a function, you can either use an actual compiled JavaScript function, one of the built in JavaScript functions such as String.prototype.toLowerCase or you can make an object that acts like a function using JSClassCreate supplying a JSObjectCallAsFunctionCallback function. -- Darin -- Regards Jack ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] KJS::JSObject question
Sorry,some corrections: I am using kJSClassDefinitionEmpty to help create the JSClassDefinition. Also, myObjectDef.myObjectName; should be myObjectDef.className = myObjectName; On Fri, May 15, 2009 at 3:35 PM, Jack Wootton jackwoot...@gmail.com wrote: I have had a look at the JavaScriptCore Framework Reference (http://developer.apple.com/documentation/Carbon/Reference/WebKit_JavaScriptCore_Ref/index.html#//apple_ref/doc/framework/javascriptcore_fw). My understanding now is that to add a custo object, the following steps would need to be taken: 1. Create a name for the new object, for example: JSStringRef myObjectName = JSStringCreateWithUTF8CString(foo); 2. Create the class definition structure; JSClassDefinition myObjectDef; myObjectDef.version = 1; myObjectDef.myObjectName; 3. Create the class. JSClassRef globalObjectClass = JSClassCreate(myObjectDef); 4. Create the context: JSGlobalContextRef context = JSGlobalContextCreate(globalObjectClass); 5. Make the object: JSObjectRef JSObjectMake(context, globalObjectClass, NULL) However I have the following questions. 1. Who should share the context? Is a single context used for a single webpage / frame? 2. Where do I define the class that will actually handle the implementation of any methods on my new object? 3. The object has been made using JSObjectMake, but how is it added to WebKit? Many thanks, Jack 2009/5/15 browserwk browse...@gmail.com: Maybe you need check out the JavaScriptCore/API directory. Following file is need carefully. JavaScriptCore/API/tests/testapi.c Thanks. -Xiong Original Message Subject: Re: [webkit-dev] KJS::JSObject question From: Jack Wootton jackwoot...@gmail.com To: Darin Adler da...@apple.com Cc: webkit-dev@lists.webkit.org webkit-dev@lists.webkit.org Date: 2009年05月15日 星期五 17时40分40秒 OK. It seems I was on completely the wrong track. I was under the impression WebKit didn't have public and non public APIs as such, at least I haven't read anything to this effect. Where can I read what the published Vs non published APIs are? Or which ones I should use and which ones I shouldn't? On Thu, May 14, 2009 at 6:02 PM, Darin Adler da...@apple.com wrote: On May 14, 2009, at 8:03 AM, Jack Wootton wrote: My question: 營 do not understand how JSObject can be used to allow for the JavaScript syntax of : myNewJSObject.someObject.hello(). My first comment is that you should not be using JSObject directly. The right way to do this is to use the C-based public API of JavaScriptCore, which includes types like JSObjectRef. The JSObject internal interface is constantly being changed and not suitable for use outside the WebKit project. In JavaScript, if you want: 燼.b.c() to work, then the object a need a property b with a property c that is callable as a function. At each level, the object can just be a general purpose object with a property attached, which can be set up with functions like JSObjectSetProperty, or the property can come from the object抯 prototype, or the property can be 揵uilt in� to the object, which can by done with JSClassCreate supplying a JSObjectGetPropertyCallback function. When it comes to the value of the property named c, to make something callable as a function, you can either use an actual compiled JavaScript function, one of the built in JavaScript functions such as String.prototype.toLowerCase or you can make an object that acts like a function using JSClassCreate supplying a JSObjectCallAsFunctionCallback function. -- Darin -- Regards Jack -- Regards Jack ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
[webkit-dev] KJS::JSObject question
Hello all, I'm looking at the JSObject class in the KJS namespace. The file is JavaScriptCore/kjs/object.h. My understanding of this class is that it must be subclassed when adding new JavaScript objects to suplement the standard global objects such as document or window etc. I have a vague understanding of the functions involved when calling a method or accessing an attribute of a JSObject, for example: JSValue *get(ExecState *exec, const Identifier propertyName) const; bool getPropertySlot(ExecState *, const Identifier, PropertySlot); virtual bool getOwnPropertySlot(ExecState *, const Identifier, PropertySlot); (Although I don't understand PropertySlots. perhaps someone can offer some guidance in that area?) My question: I do not understand how JSObject can be used to allow for the JavaScript syntax of : myNewJSObject.someObject.hello(). So in the example above there are two objects before reaching the function call. Any advice on implementing this with WebKit would be helpful. -- Regards ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] KJS::JSObject question
On May 14, 2009, at 8:03 AM, Jack Wootton wrote: My question: I do not understand how JSObject can be used to allow for the JavaScript syntax of : myNewJSObject.someObject.hello(). My first comment is that you should not be using JSObject directly. The right way to do this is to use the C-based public API of JavaScriptCore, which includes types like JSObjectRef. The JSObject internal interface is constantly being changed and not suitable for use outside the WebKit project. In JavaScript, if you want: a.b.c() to work, then the object a need a property b with a property c that is callable as a function. At each level, the object can just be a general purpose object with a property attached, which can be set up with functions like JSObjectSetProperty, or the property can come from the object’s prototype, or the property can be “built in” to the object, which can by done with JSClassCreate supplying a JSObjectGetPropertyCallback function. When it comes to the value of the property named c, to make something callable as a function, you can either use an actual compiled JavaScript function, one of the built in JavaScript functions such as String.prototype.toLowerCase or you can make an object that acts like a function using JSClassCreate supplying a JSObjectCallAsFunctionCallback function. -- Darin ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
