Submit button check if all the required fields are filled in and lock them

Use this code, and remove any other command you have under that button:

var nButton = app.alert("Are you sure you want to submit the Staging Pre-Configuration Request? After submission the form won't be editable.", 1, 2);
var emptyFields = [];
if (nButton == 4) {

    var aExcept = ["Stag_Comm", "Ret_Date_af_date", "Sta_Name", "Sta_Sign", "Sta_submit", "Remove Page", "Add Page", "Pic_1_af_image", "Pic_2_af_image", "Remove Page Template", "Add Page Template", "Pic_1 Template_af_image", "Pic_2 Template_af_image"];

    for (var i = 0; i < this.numFields; i++) {
        var name = this.getNthFieldName(i);{
            if (aExcept.indexOf(name) == -1) {
                var f = this.getField(name);
                if (f.type != "button" && f.required && f.value == f.defaultValue) {
                    emptyFields.push(f.name);
                }
            }
        }
    }
   
   if (emptyFields.length > 0) {
        app.alert("Error! You must fill in the following fields:\n" + emptyFields.join("\n"));
    } else {
		for (var i = 0; i < this.numFields; i++) {
			var name = this.getNthFieldName(i);
			var f = this.getField(name);
			if (f != null) f.readonly = true;
		}
		this.getField("Req_submit").display = display.hidden;
		this.mailDoc({cTo: "me@email.com"});
	}
}