JavaScript Validation to Submit Form

ok thank you a lot, it seems works fine ;-)

This is my code:

//this part is for validate all the fields in document by sections

//Validation methods throws alerts in case of error and focus the cursor on the wrong field

var okres=validarSolicitante();
if (okres=="ok"){
    okres="";
    okres=validarOtrosDatos();
}
if (okres=="ok"){
    okres="";
    okres=validarFirma();
}

//After validation, if is all is correct we show a confirm message and proceed to submit the form
if (okres=="ok"){
    var nButton = app.alert({cMsg: "¿Está seguro de que desea enviar los datos del formulario?",
                             cTitle: "Confirmación de envío", nIcon: 2, nType: 2});

    if ( nButton == 4 ) {
        var campos = new Array();
        var f;
        var pos = 0;
        //app.alert("nCampos del formulario:" + this.numFields);
       
        //we collect all the fields into an array
        for ( var i=0; i < this.numFields; i++) {
            var fname = this.getNthFieldName(i);
            f = this.getField(fname);
            if ( f.type != "button" ){
                campos[pos] = fname;
                pos++;
            }
        }

        /*we can show with alerts that all is ok
        app.alert("Array de campos:" + campos.length);
        for ( var i=0; i < campos.length ; i++) {
            f = this.getField(campos);
            app.alert("(" + i + ") " + campos + " = " + f.value);
        }
        */

        //and submit the form

        this.submitForm({cURL: "https://www...", bEmpty: true, aFields: campos, cSubmitAs: "FDF"});
    }
}

Problem 1:

Change this line:

if (S =="") and (Q =="")

To this:

if ((S =="") && (Q ==""))

Problem 2:

You are trying to access T and F in the first block without declaring them.

I suggest you declare them at the beginning of the script, after S and Q.

This are field names.