Generating a random confirmation code with function()

[sarahlee]

Hi Jeremy,

I am trying to generate and display a random 8-digit code to provide as experiment codes for MTurkers.

I’ve been trying with function(), but I haven’t been able to print the output of the function. The code below didn’t work.

PennController(
    newFunction("randomString", function() {
    var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
    var string_length = 8;
    var randomstring = '';
    for (var i=0; i<string_length; i++) {
    var rnum = Math.floor(Math.random() * chars.length);
    randomstring += chars.substring(rnum,rnum+1);
    }
    document.randform.randomfield.value = randomstring;
    })
    ,
    newText("code", getFunction("randomString")
        .call())
        .print()
    );

Do you have any suggestions?
Any ideas/suggestions that would help provide a random code would be much appreciated.

Thanks,
Sarah

[Jeremy]

Hi Sarah,

You’re almost there, but unfortunately you can’t refer to other PennController elements in a new* statement. And since you probably want to log the random code as well, I would store it in a Var element (whose .set command can also run javascript code):

let alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz"; 

PennController(
    newVar("ID", "")
        .settings.global()
        .set(v =>[...Array(8)].reduce(a=>a+alphanum.charAt(Math.floor(Math.random()*alphanum.length)),''))
    ,
    newText("code", "")
        .settings.text( getVar("ID") ) 
        .print()
)
.log("code", getVar("ID"))

I made the ID var global so you can add its value at the end of your results lines using .log.

NB: I reused your code but of course the trial defined here will be fully executed (and done) in an instant unless you add a wait command on an element of an appropriate type.

Jeremy

[sarahlee]

This works! Thanks so much for the help!

Sarah

[Author]

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