Need both cond & event to transition when using $.ajax?

[Jeff Chimene]

I wonder if I'm doing this right.

Instead of two interpreter.gen("event.sfm.purchase) calls, I had to introduce a variable "postComplete".
Instead of two assignments to "postComplete", I have to use interpreter.gen().

The transition isn't triggered when I set postComplete=true inside the $.ajax.success() function. I must use an interpreter.gen("event.sf.postComplete") call.

SCION throws the
"gen called before previous call to gen could complete. If executed in single-threaded environment, this means it was called recursively, which is illegal, as it would break SCION step semantics."
exception when I use interpreter.gen("event.sfm.postComplete") inside the ELSE branch.

<datamodel>

<data id="postComplete" expr="false" />

</datamodel>
<state id="sfm.sales.post">
        <onentry>
            <script>
            if ('' != getSalesEmail()) {
                $.ajax({type: "POST",
                    url: "URL",
                    data: "some data",
                    success: function(data) {
                        interpreter.gen("event.sfm.postComplete");
                    }});
            } else {
                postComplete=true;
            }
            </script>
        </onentry>
        <transition target="sfm.purchase" event="event.sfm.postComplete" />
        <transition target="sfm.purchase" cond="postComplete" />
    </state>

tia,
jec

[Jacob Beard]

Hi Jeff,

Rather than calling interpreter.gen() recursively inside of your script, you can instead use the built-in $send function. This is described in the Action Tag Scripting API: 

https://github.com/jbeard4/SCION/wiki/Action-Tag-Scripting-API#send

Note that this is a feature exposed by SCION, but not a part of standard SCXML.

Technically speaking, you could use a $raise in the else clause, and a $send in the body of the $.ajax callback. This is because the else clause would be executed in the current small-step, but the $.ajax is asynchronous, and would be executed after the end of the current big-step. You can see SCION semantics for more info on this: https://github.com/jbeard4/SCION/wiki/Scion-Semantics

Let me know if you have any questions Thanks,

Jake

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[Jeffrey Chimene]

Thanks, Jacob I will try $send and $raise