Thanks Steve.
is possible to make a synchronous call from javascript to java ?
Best Regards Kandy
El jueves, 4 de enero de 2018, 21:04:09 (UTC+1), Steve Hannah escribió:
>
> Calls from javascript to java must be asynchronous. The way to do this
> is to:
>
> // You want javascript to be able to call into java AND receive a result.
> // From the Java side, you would add a callback
> bc.addJSCallback("window.myfunc=function(arg){callback.onSuccess(arg)}",
> res->{
> String[] parts = Util.split(res.toString(), " ");
> String arg = parts[0];
> String callbackFunc = parts[1];
> String result = doSomethingWithArg(arg);
> bc.execute(callbackFunc+"("+result+")");
> });
>
> // On the javascript side you could then do something like this
>
> window.myCallback = function(arg) {
> // Do something with the argument
> }
> myfunc("myarg window.myCallback");
>
> This is a simplistic example that passes a a message from javascript to
> java by placing the "contents" of the message at the beginning, and then a
> callback to call in javascript after the space. If you need to send
> arbitrary strings, then this scheme will fail - but you could just as
> easily send a JSON message from javascript that includes some content and
> information about where to send it (the callback information), which would
> be more resilient to argument formatting.
>
> Steve
>
> On Thu, Jan 4, 2018 at 11:24 AM, <ka...@bitxenio.com <javascript:>> wrote:
>
>> Thanks Steve
>>
>> on the point 1 I need to call from Javascript to Java, and return from
>> Java to Javascript a response.
>>
>> My doubt is how do I have to do it in Java and in Javascritp, I searched
>> examples in code of GoolgeMaps Implementation but I didn't find any help.
>>
>> Best Regards Kandy
>>
>> On Thursday, January 4, 2018 at 3:53:19 PM UTC+1, Steve Hannah wrote:
>>
>>> The best examples right now are in the GoogleMaps cn1lib
>>>
>>> https://github.com/codenameone/codenameone-google-maps/blob/master/GoogleMaps/src/com/codename1/googlemaps/MapContainer.java
>>>
>>> There are also samples in the unit tests:
>>>
>>> https://github.com/codenameone/CodenameOne/blob/master/tests/core/test/com/codename1/ui/JavascriptTests.java
>>>
>>> The unit tests all use the executeAndWait() wrappers for convenience,
>>> but these carry the baggage of invokeAndBlock - to make it synchronous.
>>> Best for performance to try to use async versions whenever possible.
>>>
>>> 1) call from Javascritp to java and receive a response from java
>>>
>>>
>>> First add your callback:
>>> bc.addJSCallback("window.app.mycb=function(arg){callback.onSuccess(arg)}",
>>> arg->{
>>> // Log.p("The result was "+arg.getInt());
>>> });
>>>
>>> Then on the javascript side, you can call "window.app.mycb(1+2)", and
>>> your java callback will be called.
>>>
>>> 2) call from java to javascript and receive a response from javascript
>>>
>>>
>>> Async style:
>>>
>>> bc.execute("callback.onSuccess(1+2)", res->{
>>> Log.p("The result was "+res.getInt());
>>> });
>>>
>>> Sync Style:
>>>
>>> int result = bc.executeAndWait("callback.onSuccess(1+2)").getInt();
>>>
>>>
>>> If you need to pass parameters to your javascript code, there are
>>> variants that do that and handle escaping strings properly.
>>>
>>> e.g.
>>>
>>> bc.execute("callback.onSuccess(${0}+${1})", new Object[]{1, 2}, res->{
>>> Log.p("The result was "+res.getInt()); // Should be 3
>>> });
>>>
>>> If you need to call methods on a Javascript object, you can also create
>>> a java "Proxy" object to make this a bit easier. E.g.
>>>
>>> JSProxy window = bc.createJSProxy("window");
>>> int height = window.getAndWait("innerHeight").getInt();
>>>
>>>
>>> Steve
>>>
>>> On Thu, Jan 4, 2018 at 6:12 AM, <ka...@bitxenio.com> wrote:
>>>
>>>> Hi Steve
>>>>
>>>> where can I found documentation or examples to addJSCallback?
>>>>
>>>> I can be able to:
>>>>
>>>> call from javascritp to java
>>>>
>>>> browserComponent.addJSCallback(
>>>> "window.app = {isActive: function() {callback.onSuccess()}}",
>>>> value -> {
>>>> call from java to javacript and send parameters
>>>>
>>>> browserComponent.execute("controlPopUp ('"+ relojReservaValueString
>>>> +"', "+ reservationState +","+ vehicleLockState +")");
>>>>
>>>>
>>>> Now I need,
>>>>
>>>> 1) call from Javascritp to java and receive a response from java
>>>>
>>>> 2) call from java to javascript and receive a response from javascritp
>>>>
>>>>
>>>> Can you help me ?
>>>>
>>>> Best Regards Kandy
>>>>
>>>> On Wednesday, January 3, 2018 at 8:05:56 PM UTC+1, ka...@bitxenio.com
>>>> wrote:
>>>>>
>>>>> Hi Steve:
>>>>>
>>>>> Indeed, upon further inspection you're so right! We've just
>>>>> detected a problem with our SVN workflow in which we keep updating the
>>>>> "libVersion" property on codenameone.properties between dev machines
>>>>> WITHOUT updating the libs at the same time, so we were keeping old libs
>>>>> and
>>>>> preventing the proper update procedure.
>>>>>
>>>>> We now see the deprecated warnings and the new code in
>>>>> BrowserComponent. Will work from here.
>>>>>
>>>>> Kind regards,
>>>>> Miguelanxo.
>>>>>
>>>>> On Wednesday, January 3, 2018 at 7:09:50 PM UTC+1, Steve Hannah wrote:
>>>>>>
>>>>>> I just confirmed with a fresh project. The changes are there. I'm
>>>>>> not sure why you're not picking them up. Is your project using the libs
>>>>>> at
>>>>>> the default location (lib/CodenameOne.jar and JavaSE.jar) or have you
>>>>>> adjusted the classpath for the project.
>>>>>>
>>>>>> Steve
>>>>>>
>>>>>> On Wed, Jan 3, 2018 at 10:02 AM, <ka...@bitxenio.com> wrote:
>>>>>>
>>>>>>> Hi Steve
>>>>>>>
>>>>>>> I already did the project libs update, but didn't help. My library
>>>>>>> date is 30/12/2017, when I do the update it says "Your proyect Libs are
>>>>>>> up
>>>>>>> to date", we are blocked on the development of our App to IOS.
>>>>>>>
>>>>>>> Please help us.
>>>>>>>
>>>>>>> Best Regards
>>>>>>> Kandy
>>>>>>>
>>>>>>> On Wednesday, January 3, 2018 at 5:44:23 PM UTC+1, Steve Hannah
>>>>>>> wrote:
>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Jan 3, 2018 at 8:35 AM, <ka...@bitxenio.com> wrote:
>>>>>>>>
>>>>>>>>> Hello:
>>>>>>>>>
>>>>>>>>> How can we use that new interface? There's no documentation
>>>>>>>>> and our current lib doesn't expose said addJSCallback() yet (and
>>>>>>>>> updating
>>>>>>>>> c1 libs didn't help).
>>>>>>>>>
>>>>>>>> You need to update your project libs. It should be there (just
>>>>>>>> tested on a project here). (I.e. Project Properties > Update Project
>>>>>>>> Libs
>>>>>>>> .. not "update cn1libs")
>>>>>>>>
>>>>>>>>
>>>>>>>>> Also, is the fix already available in the build servers?
>>>>>>>>>
>>>>>>>> No. It will be up in the next build server update on Friday.
>>>>>>>>
>>>>>>>> Steve
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>> Kind regards,
>>>>>>>>> Kandy.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Wednesday, January 3, 2018 at 2:47:04 PM UTC+1, Steve Hannah
>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>> This looks like a race condition that has been there for a
>>>>>>>>>> while. I have just committed a fix for it here
>>>>>>>>>>
>>>>>>>>>> https://github.com/codenameone/CodenameOne/commit/783ac2828409aa747103a35001b4886e24944484
>>>>>>>>>>
>>>>>>>>>> With the last update, however, the com.codename1.javascript
>>>>>>>>>> package is now deprecated in favour of a new async API that is
>>>>>>>>>> incorporated
>>>>>>>>>> directly into the BrowserComponent class. I recommend migrating
>>>>>>>>>> over to
>>>>>>>>>> this new API for new code, as it will produce much better
>>>>>>>>>> performance (no
>>>>>>>>>> hidden invokeAndBlock under the hood - except in xxxAndWait()
>>>>>>>>>> methods).
>>>>>>>>>>
>>>>>>>>>> Using the new API, your code would become:
>>>>>>>>>>
>>>>>>>>>> bc.addJSCallback("window.checkfoxClickedCallback ={setChecked:
>>>>>>>>>> function(){ callback.onSuccess(null)}}", r->{
>>>>>>>>>> Log.p("->checkboxClickedCallback.setChecked()");
>>>>>>>>>>
>>>>>>>>>> contexto.mostrarMensaje("checkboxClickedCallback.setChecked()");
>>>>>>>>>> });
>>>>>>>>>> bc.addJSCallback("window.okButtonClickedCallback = {showMap:
>>>>>>>>>> function() { callback.onSuccess(null)}}", r->{
>>>>>>>>>> Log.p("->okButtonClickedCallback.showMap()");
>>>>>>>>>> contexto.mostrarMensaje("okButtonClickedCallback.showMap()");
>>>>>>>>>> });
>>>>>>>>>>
>>>>>>>>>> Notice, with this new syntax, you reference the java callback
>>>>>>>>>> explicitly in the javascript code via the "callback" variable,
>>>>>>>>>> which, in
>>>>>>>>>> Javascript, contains 2 methods: onSuccess(arg), and onError(message,
>>>>>>>>>> code).
>>>>>>>>>>
>>>>>>>>>> Steve
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Wed, Jan 3, 2018 at 5:09 AM, <ka...@bitxenio.com> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hello:
>>>>>>>>>>>
>>>>>>>>>>> Since the last codename1 libary update we've been having
>>>>>>>>>>> problems with the BrowserComponent on iOS. We've narrowed down the
>>>>>>>>>>> problem
>>>>>>>>>>> to the callback registration process (which gets executed on the
>>>>>>>>>>> BrowserComponent onLoad callback). We register two functions, but
>>>>>>>>>>> only the
>>>>>>>>>>> second one can be invoked from javascript. The first one gets
>>>>>>>>>>> registered ok
>>>>>>>>>>> (we can see its code from the javascript side) but fails to execute
>>>>>>>>>>> on iOS
>>>>>>>>>>> (in Android and the simulator works fine). We tried a lot of
>>>>>>>>>>> permutations,
>>>>>>>>>>> and different argument lengths for both functions, but the only
>>>>>>>>>>> difference
>>>>>>>>>>> we see is the registration order. If we switch the registration
>>>>>>>>>>> order, we
>>>>>>>>>>> can only invoke the other one (whichever gets registered last).
>>>>>>>>>>>
>>>>>>>>>>> /*
>>>>>>>>>>> * Registramos el callback JS de valor cambiado del checkbox "No
>>>>>>>>>>> volver a mostrar este asistente".
>>>>>>>>>>> */
>>>>>>>>>>> JSObject checkboxClickedCallback = (JSObject)
>>>>>>>>>>> javascriptContext.get("{}");
>>>>>>>>>>> checkboxClickedCallback.set("setChecked", new JSFunction() {
>>>>>>>>>>> public void apply(JSObject self, Object[] args) {
>>>>>>>>>>> Log.p("->checkboxClickedCallback.setChecked()");
>>>>>>>>>>> contexto.mostrarMensaje("checkboxClickedCallback.setChecked()");
>>>>>>>>>>>
>>>>>>>>>>> }
>>>>>>>>>>> });
>>>>>>>>>>> javascriptContext.set("window.checkboxClickedCallback",
>>>>>>>>>>> checkboxClickedCallback);
>>>>>>>>>>>
>>>>>>>>>>> /*
>>>>>>>>>>> * Registramos el callback JS de click en el botón "OK".
>>>>>>>>>>> */
>>>>>>>>>>> JSObject okButtonClickedCallback = (JSObject)
>>>>>>>>>>> javascriptContext.get("{}");
>>>>>>>>>>> okButtonClickedCallback.set("showMap", new JSFunction() {
>>>>>>>>>>> public void apply(JSObject self, Object[] args) {
>>>>>>>>>>> Log.p("->okButtonClickedCallback.showMap()");
>>>>>>>>>>> contexto.mostrarMensaje("okButtonClickedCallback.showMap()");
>>>>>>>>>>>
>>>>>>>>>>> }
>>>>>>>>>>> });
>>>>>>>>>>> javascriptContext.set("window.okButtonClickedCallback",
>>>>>>>>>>> okButtonClickedCallback);
>>>>>>>>>>>
>>>>>>>>>>> Please help, as it's impacting our current production code.
>>>>>>>>>>>
>>>>>>>>>>> Kind regards,
>>>>>>>>>>> Kandy
>>>>>>>>>>>
>>>>>>>>>>> --
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>>>>>>>>>>> .
>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> Steve Hannah
>>>>>>>>>> Software Developer
>>>>>>>>>> Codename One
>>>>>>>>>> http://www.codenameone.com
>>>>>>>>>>
>>>>>>>>> --
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>>>>>>>>> .
>>>>>>>>>
>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Steve Hannah
>>>>>>>> Software Developer
>>>>>>>> Codename One
>>>>>>>> http://www.codenameone.com
>>>>>>>>
>>>>>>> --
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>>>>>>> .
>>>>>>>
>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Steve Hannah
>>>>>> Software Developer
>>>>>> Codename One
>>>>>> http://www.codenameone.com
>>>>>>
>>>>> --
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>>>>
>>>> For more options, visit https://groups.google.com/d/optout.
>>>>
>>>
>>>
>>>
>>> --
>>> Steve Hannah
>>> Software Developer
>>> Codename One
>>> http://www.codenameone.com
>>>
>> --
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>>
>
>
>
> --
> Steve Hannah
> Software Developer
> Codename One
> http://www.codenameone.com
>
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