[Simple] Callback confusion with isc.RPCManager.sendRequest

[jj_kbs]

In the Code Snippet below (as a standalone example) i tried to get a simple answer from a perl(cgi) script which works in the sense that the response_object has the data i want/expect
As i understood it from several sources the callback function would fire after a successful response.

When i check the value of "answer" before returning it or the value of "loginStatus" after functest has run its course i recieve "false" in both cases even tough the value recieved and processed in the callback is correct and should set "answer" to true.

Am i missing something here with the callback/RPC ?? or is the Problem somewhere else ??


....

<SCRIPT>var isomorphicDir="../../isomorphic/";</SCRIPT>
    <SCRIPT SRC=../../isomorphic/system/modules/ISC_Core.js></SCRIPT>
    <SCRIPT SRC=../../isomorphic/system/modules/ISC_Foundation.js></SCRIPT>
    <SCRIPT SRC=../../isomorphic/system/modules/ISC_Containers.js></SCRIPT>
    <SCRIPT SRC=../../isomorphic/system/modules/ISC_Grids.js></SCRIPT>
    <SCRIPT SRC=../../isomorphic/system/modules/ISC_Forms.js></SCRIPT>
    <SCRIPT SRC=../../isomorphic/system/modules/ISC_DataBinding.js></SCRIPT>
  <SCRIPT SRC=../../isomorphic/skins/SmartClient/load_skin.js></SCRIPT>
    <SCRIPT SRC=../../isomorphic/locales/frameworkMessages_de.properties></SCRIPT>

.....

<SCRIPT>


isc.Button.create(
{
    left:20,

    title: "Login",
    click : function () {
        isc.showLoginDialog(function (credentials, dialogCallback) {
        
            var loginStatus = functest(credentials.username,credentials.password);
            console.log("LOG "+ loginStatus);
            dialogCallback(loginStatus);
            
        },
        {
        dismissable: true
        });
},
    top:45

});

function functest (user,pass) {

    var answer = false;
    isc.RPCManager.sendRequest({
                actionURL: "scripts/logcheck.pl",
                containsCredentials:true,
                httpMethod: "POST",
                useSimpleHttp: true,
                showPrompt:false,
                serverOutputAsString: true,
                params: {    j_username: user,
                            j_password: pass},
                callback: function (RpcResponse_o) {
                    if (RpcResponse_o.data == "1") {
                        answer = true;
                        console.log("change_aw"+ answer);

                    }
                }
    });
    console.log("return_aw"+ answer);
    return answer;
}


</SCRIPT>

[Isomorphic]

The callback is executed asynchronously, when the server replies. Your method exits synchronously, so the callback has not been run, and answer will always be false.

[jj_kbs]

The callback is executed asynchronously, when the server replies. Your method exits synchronously, so the callback has not been run, and answer will always be false.

ok i feel slightly stupid now :)
but i went over the methods/paramas again and i could not find a way to make calls synchronous like i would be able to in "regular" javascript

Would the correct way to do this actually be a normal sync request without the methodes provided by the framework or which way would it be intended here with "non-java backend"

I am going to read over the php and quick start guide again but any help is appriciated

[Isomorphic]

Only certain browsers allow synchronous server calls in JavaScript and those that do are moving to disallow it, as it's generally seen as a bad practice.

You should instead arrange your code to expect server contact to be asynchronous.

[jj_kbs]

Only certain browsers allow synchronous server calls in JavaScript and those that do are moving to disallow it, as it's generally seen as a bad practice.

You should instead arrange your code to expect server contact to be asynchronous.

hmm very well :)
in that case i have changed the code to accomodate (for anyone interested see below)

thank you for the quick help and new information


in the end i could just give over the callback from the dialog to the new function that handles login to call on it but for prototyping this works just as well

isc.Button.create(
{
    left:20,

    title: "Login",
    click : function () {
        isc.showLoginDialog(function (credentials, dialogCallback) {

            isc.RPCManager.sendRequest({
                actionURL: "scripts/logcheck.pl",
                containsCredentials:true,
                httpMethod: "POST",
                useSimpleHttp: true,
                showPrompt:false,
                serverOutputAsString: true,
                params: {    j_username: credentials.username,
                            j_password: credentials.password},
                callback: function (RpcResponse_o) {
                    if (RpcResponse_o.data == "1") {
                        dialogCallback(true);
                    } else {
                        dialogCallback(false);
                    }
                    
                }
                
            });
            
        },
        {
        dismissable: true
        }
    );
    },
    top:45

}
);