B4J Question [WebApp] Send result of an asynchronous JS-Function back to WebSocket?

[Kiffi]

Hello,

i start from a Websocket an asynchronous JS-Function.

GoogleMapsGeocoder2 = function(address) {
    var geocoder = new google.maps.Geocoder();
    geocoder.geocode({ 'address': address }, function(results, status) {
        if (status == google.maps.GeocoderStatus.OK) {
            if (status != google.maps.GeocoderStatus.ZERO_RESULTS) {
                var CSV = "";
                $.each(results, function(key, result) {
                    CSV += result.formatted_address + ";";
                    CSV += result.geometry.location + "\n";
                });
                // ? How to send CSV to the Websocket?
            } else {
                // ? How to send "No results found" to the Websocket?
            }
        } else {
            // ? How to send "Geocode was not successful for the following reason: " + status to the Websocket?
        }
    });
};

How can i send the result back to the Websocket?

Thanks in advance and Greetings ... Peter

 

[billzhan]

You may try "return". Not sure if it works for you.

An example to fetch timezone from client,it works for me:

Dim tz As String ="return new Date().getTimezoneOffset();"
Dim tzfuture As Future=ws.EvalWithResult(tz,Null)
Log("tz:  "&tzfuture.Value)

 

[Kiffi]

Hello billzhan,

thanks for your reply!

unfortunately this doesn't work for me. The function returns immediately. The result returns later.

Therefore i need to know how to call a websocket-sub manually

something like this (Pseudocode):

myFunction = function() {
 doSomeAsynchronousStuff(function() {
   callAWebsocketSubWhenReady(myWebsocketSub, Result);
 });
};

Greetings ... Peter

 

[billzhan]

I think of a workaround, you can have a hidden button, when result is ready, pass the result to button value and then click it.

In button_click event, you can get the val.

 

[Kiffi]

thanks, billzhan. I think i got it.

I prepare the Websocket-Code the following way:

Sub Class_Globals
    [...]
    Dim RequestLatLng As JQueryElement
End Sub

[...]

Private Sub RequestLatLng_OnSuccess(Params As Map)
    Dim Result As String
    Result = Params.Get("result") 
    WS.Alert(Result)
End Sub

Private Sub RequestLatLng_OnError(Params As Map)
    Dim Result As String
    Result = Params.Get("result") 
    WS.Alert(Result)
End Sub

and then i can send:

b4j_ws.send(JSON.stringify({type: 'event', event: 'RequestLatLng_OnSuccess', params: {result:theResult} }));

or

b4j_ws.send(JSON.stringify({type: 'event', event: 'RequestLatLng_OnError', params: {result:theResult} }));

Greetings ... Peter

 

[billzhan]

Peter,

Great. It works here.

bz

 

[Erel]

You should use b4j_raiseEvent:

b4j_raiseEvent("requestlatlng_onerror", {result: theResult}) //the event name should be lower cased

 

[Kiffi]

You should use b4j_raiseEvent:

even better!

Thanks and Greetings ... Peter