Cannot getVal correctly

[Rick]

Hi Jeremy,

I have one problem with referring to the already-created global variable. The mini code is as follows:

Sequence ("createID","experiment","bye")

newTrial("createID",
  newVar("subjID")
      .global()
      .set(String.fromCharCode(65+Math.floor(Math.random() * 26)) + Math.floor((Math.random() * 10000) + 1))
       .log()
    )
    .log("ParticipantID",getVar("subjID"))

….Experiment trials(skipped).log("ParticipantID",getVar("subjID"))

newTrial("bye",
  
    newText("<p>Thank you for doing this study!!!</p>")
		.settings.center()
        .print()
    ,
    newText("Your participant id number is:").settings.center()
        .print()
    ,
    newText()
        .text(getVar("subjID"))
		.settings.center()
        .print()
    ,
    newButton("void")
        .wait()
    )
    .setOption("countsForProgressBar" , false)
    ;

The errors are as follows
[22:24:34] Command ‘0’ unknown on Var element ‘subjID’. (PennController: 36)
[22:24:34] Command ‘length’ unknown on Var element ‘subjID’. (PennController: 36)
[22:24:34] Command ‘parentNode’ unknown on Var element ‘subjID’. (PennController: 36)

I tried many times(always get the errors), and part of the code ( newText()
.text(getVar(“subjID”))) in “bye” could not get the value of “subjID” variable, while the experiment trials could append the “subjID” as a column “ParticipantID” successfully. It is really confusing: if it is not global, it could not have been appended to the experiment trials ;if it is global, the “bye” session could not refer to it and get the value successfully. Could you offer me some suggestions?

Thanks!

• This topic was modified 3 years, 6 months ago by Rick.
• This topic was modified 3 years, 6 months ago by Rick.
• This topic was modified 3 years, 6 months ago by Rick.
• This topic was modified 3 years, 6 months ago by Rick.
• This topic was modified 3 years, 6 months ago by Rick.
• This topic was modified 3 years, 6 months ago by Rick.

[Jeremy]

Hi Rick,

As far as I can tell, you don’t need a Var element to do what you’re after:

subjID = String.fromCharCode(65+Math.floor(Math.random() * 26)) + Math.floor((Math.random() * 10000) + 1)

Sequence ("experiment","bye")

Header(
  // ...
)
.log("ParticipantID", subjID)

// ... experiment

newTrial("bye",
    defaultText
        .center()
        .print()
    ,
    newText("<p>Thank you for doing this study!!!</p>")
    ,
    newText("Your participant id number is:")
    ,
    newText(subjID)
    ,
    newButton("void")
        .wait()
)
.setOption("countsForProgressBar" , false)

What you report is a known bug, I’ll work on fixing it for the next release (or the one after that)

Jeremy

[Rick]

Hi Jeremy,

Thanks so much for your quick reply! Your solution works perfectly!

It’s great to know that it is a bug and also I learned a lot from your code (that I could define the variable not simply in newVal()).

Best,
Rick

[Author]

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