ISO 6346 algorithm - Client Script

ISO 6346 is an international standard covering the coding, identification and marking of intermodal (shipping) containers.

Friend how are you? could you help me with this? I have a workflow and an associated function that work without a problem, in this function I check that the container number is correct, if it is, the workflow adds a check in a checkbox field.

I have taken this code that works correctly and try to run it as a client script, I have been unsuccessful for a few days. If you could help me it would be great.

var Name = value;
if (Name !== null) {
    if (Name.length === 11) {
        var first10 = [];
        var isOk = false;
        var check = -1;
        var char2num = new Map({"0":0,"1":1,"2":2,"3":3,"4":4,"5":5,"6":6,"7":7,"8":8,"9":9,"A":10,"B":12,"C":13,"D":14,"E":15,"F":16,"G":17,"H":18,"I":19,"J":20,"K":21,"L":23,"M":24,"N":25,"O":26,"P":27,"Q":28,"R":29,"S":30,"T":31,"U":32,"V":34,"W":35,"X":36,"Y":37,"Z":38});
        if(cntrNum.length === 11){
            cntrNum = cntrNum.toUpperCase();
            first10.push(cntrNum.substring(0,1));
            first10.push(cntrNum.substring(1,2));
            first10.push(cntrNum.substring(2,3));
            first10.push(cntrNum.substring(3,4));
            first10.push(cntrNum.substring(4,5));
            first10.push(cntrNum.substring(5,6));
            first10.push(cntrNum.substring(6,7));
            first10.push(cntrNum.substring(7,8));
            first10.push(cntrNum.substring(8,9));
            first10.push(cntrNum.substring(9,10));
            check = parseInt(cntrNum.substring(10,11));
            var num = 0.0;
            var x = 0;
            for(var c of first10){
                var val = char2num.get(c);
                var producto = Math.pow(2,x);
                var sum = val * producto;
                num = num + sum;
                x = x + 1;
            }
            num = num - (Math.floor(num / 11) * 11);
            var mayor = num > 9;
            if(mayor){
                var numString = num.toString().substring(1,2);
                num = parseFloat(numString);
            }
            if(check !== num){
                ZDK.Client.showConfirmation('El numero de contenedor no cumple norma ISO 6346','Continuar','Corregir');
            }
        }
    }
}

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