JsInterop receipts for simple JSNI code ?

[Hristo Stoyanov]

Does any one know (/has easy receipts for) how to replace the following JSNI code with JsInterop code :

public static native String getJSVariableAsString(String jsVarName) /*-{

        return $wnd[jsVarName].toString();

}-*/;

private static native boolean isJSVariableDefined(String jsVarName)/*-{

        return !!$wnd[jsVarName];

}-*/;

[Jens]

You still need to use JSNI for accessing these properties. Depending on the API you want to build you could define @JsOverlay methods inside @JsType(native = true) classes and let them delegate to a JSNI based utility class.

-- J.

[Hristo Stoyanov]

Jens,

Thanks, so apparently JsInterop cannot be a complete replacement of JSNI?

I was hoping to be able to wrap in @JsType(native = true) something like Object.keys(window)

[Hristo Stoyanov]

Actually, it might be possible to do it with JsInterop only:

class Globals {

        @JsMethod(namespace=GLOBAL)

        public native Object eval(String expresion);

        

        @JsOverlay

        public native boolean isVariableDefined(String varName){

             return Boolean.TRUE.equals(eval("!!window['"+varName+"']"));

        }

}

I guess, you can also use JSON.safeEval() ... but we dont know if will survive  in J2CL.

[Paul Stockley]

Eval is really slow. I would use JSNI. Eventually I think J2CL will have a way to execute javascript. Just isolate the JSNI in a helper class so it can easily be replaced.

[Goktug Gokdogan]

JsInterop will provide some base classes for stuff that are not possible with JsInterop annotations.

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[Paul Stockley]

Will this be for J2CL only?

On Thursday, May 26, 2016 at 6:35:36 PM UTC-4, Goktug Gokdogan wrote:

JsInterop will provide some base classes for stuff that are not possible with JsInterop annotations.

On Wed, May 25, 2016 at 1:30 PM, Paul Stockley <pstoc...@gmail.com> wrote:

Eval is really slow. I would use JSNI. Eventually I think J2CL will have a way to execute javascript. Just isolate the JSNI in a helper class so it can easily be replaced.

On Wednesday, May 25, 2016 at 3:35:07 PM UTC-4, Hristo Stoyanov wrote:

Actually, it might be possible to do it with JsInterop only:

class Globals {

        @JsMethod(namespace=GLOBAL)

        public native Object eval(String expresion);

        

        @JsOverlay

        public native boolean isVariableDefined(String varName){

             return Boolean.TRUE.equals(eval("!!window['"+varName+"']"));

        }

}

I guess, you can also use JSON.safeEval() ... but we dont know if will survive  in J2CL.

On Wednesday, May 25, 2016 at 12:21:26 PM UTC-7, Hristo Stoyanov wrote:

Jens,

Thanks, so apparently JsInterop cannot be a complete replacement of JSNI?

I was hoping to be able to wrap in @JsType(native = true) something like Object.keys(window)

On Tuesday, May 24, 2016 at 5:11:39 PM UTC-7, Jens wrote:

You still need to use JSNI for accessing these properties. Depending on the API you want to build you could define @JsOverlay methods inside @JsType(native = true) classes and let them delegate to a JSNI based utility class.

-- J.

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[Goktug Gokdogan]

Sorry I didn't see this question earlier. It will work with both GWT and J2CL; that will be one of the main benefits.

On Fri, May 27, 2016 at 6:02 AM, Paul Stockley <pstoc...@gmail.com> wrote:

Will this be for J2CL only?

On Thursday, May 26, 2016 at 6:35:36 PM UTC-4, Goktug Gokdogan wrote:

JsInterop will provide some base classes for stuff that are not possible with JsInterop annotations.

On Wed, May 25, 2016 at 1:30 PM, Paul Stockley <pstoc...@gmail.com> wrote:

Eval is really slow. I would use JSNI. Eventually I think J2CL will have a way to execute javascript. Just isolate the JSNI in a helper class so it can easily be replaced.

On Wednesday, May 25, 2016 at 3:35:07 PM UTC-4, Hristo Stoyanov wrote:

Actually, it might be possible to do it with JsInterop only:

class Globals {

        @JsMethod(namespace=GLOBAL)

        public native Object eval(String expresion);

        

        @JsOverlay

        public native boolean isVariableDefined(String varName){

             return Boolean.TRUE.equals(eval("!!window['"+varName+"']"));

        }

}

I guess, you can also use JSON.safeEval() ... but we dont know if will survive  in J2CL.

On Wednesday, May 25, 2016 at 12:21:26 PM UTC-7, Hristo Stoyanov wrote:

Jens,

Thanks, so apparently JsInterop cannot be a complete replacement of JSNI?

I was hoping to be able to wrap in @JsType(native = true) something like Object.keys(window)

On Tuesday, May 24, 2016 at 5:11:39 PM UTC-7, Jens wrote:

You still need to use JSNI for accessing these properties. Depending on the API you want to build you could define @JsOverlay methods inside @JsType(native = true) classes and let them delegate to a JSNI based utility class.

-- J.

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[Thomas Broyer]

FWIW, this is tracked at https://github.com/gwtproject/gwt/issues/9364