returning a value from a javascript action

herrpedro · November 2, 2019 at 10:57 PM

Hi all

so far all examples i got was to call functions and then change something in krpano plugins or positions (there is one example in the skin file
but i did not find any to "return a value"

Code

<action name="register_javascript_actions2" type="Javascript" autorun="preinit">
  krpano.actions.getlanguagecontent = function( labelId , type , outresult)
    {
		args[2]='ola';
		outresult = 'ola';
}
</action>

when i call

Code

getlanguagecontent(get(hotspot[%1].hsname) , 'auditorio' , outputfromfunction);

i was hoping to get 'ola' in the outputfromfunction variable bit it stays null all the time
tried with args and setting the variable directly and i always get null
i see the function running because i added some "console.log" and it displays

thank you for the help

herrpedro · November 2, 2019 at 11:10 PM

i keep digging
added a console log to see the "args" array and i get
at 0 the "envelope" action name so.. i guess it is not this way
there is no point in setting args[3] to return the output since i'm not getting the 2 input arguments

["register_javascript_actions2"]
0: "register_javascript_actions2"

indexofrefraction · November 3, 2019 at 9:11 AM

the args array is used in type=Javascript actions.
your register_javascript_actions2() is type=Javascript,
but krpano.actions.getlanguagecontent() is working as a normal js function:

Code

<action name="register_javascript_actions" type="Javascript" autorun="preinit">
	krpano.actions.examplefunc = function(dest, a, b) {
		krpano.set(dest, a * b);
	};
</action>


<action autorun="onstart">
	examplefunc(test, 5, 2);
	trace(test); // 10
</action>

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important:
if you create functions like that, you must check/verify the variable type of the input variables.
ie. if you would create an add function and do a+b you have to ensure that a and b are numbers first!

and... its not a must, but in krpano xml actions the return value target is normally the first argument.
i.e. https://krpano.com/docu/actions/#mul

herrpedro · November 3, 2019 at 1:06 PM

hi,

thank you for your reply.

That wont do (i think) in my case because of atomic execution. All the function will execute synchronous but i think that the get variable in krpano variable, after, the execution of the jsfunction, can get a different value if some executions occur at the same time.

I turned into a jsget with 2 "envelope" actions since i can pass %1, %2, etc to jsget but i could not manage to pass a variable, neither by name, neither with get but %3 was fine

i had a problem while ago with detecting if the variable was defines and i was hoping to solve it today with a js action.

i was hoping to get this code inside my xml but i couldn't... may be later i'll understand the connections with parameters bewteen actions and javascript actions and plain javascript
from time to time i try and i always end by solving it but not in the way which i think is the correct

thanks again

returning a value from a javascript action

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