Checking for a value in a field within a subform before allowing a user to add a new Instance

Question

Form setup:
Page name = Page1
1st Subform within Page1 = Info (set to flowed)
Objects within Info subform: Name (textfield) and Email (textfield)
I also have a 2nd subform within Page 1 which contains an add instance button
What I'm trying to do:
1. The user needs to enter their Name and Email address then click "Add Instance button" to create a new instance of the Info subform :  _Info.addInstance(1);
2. If the user fails to enter an email address, I want there to be a mesage box that infos the user that an email address is required before he/she can create a new instance. Note: It would also be nice if the cursor is Set to foucs on the email field within that particular subform instance.
3. As long as the user tries to continue adding an instance, he/she will be denied if they do not enter an email in that instance
4. If the user includes an email address in that instance, then the script will create add a new isntance
5. The process should continue in this manner for each each click of the add instance button
I presume there nees to be a loop and perhaps a somExpression scipt, but I'm not sure.
Here's what i have so far (see below)....The script works for the first instance on the page, but it doesn't prevent new instances from being created when the email field in that "current instance" is empty. I want it to prevent the user from adding new instances if the email field is balnk in that "current instance". So, I guess I'm not sure how ot test a field in the current instance in a repeating subform.
var vName = Info.somExpression + ".email";
    var vEmail = xfa.resolveNode(vName).rawValue;
    if(vEmail == null)
xfa.host.messageBox("PLease enter an email address.");
else{
Form._Info.addInstance(1);
        var i = Form._Info.count - 1;
        xfa.host.setFocus(xfa.resolveNode("Info[" + i + "].Name")); //This set's the focus of the cursor in the Name field of the newly created subform
Please advise, and thank you in advance!!!!!!

Answer 1

Hi,
I think you can acheive what you want just by adding "lastRow.presence = "hidden";" when you do the addInstance, so it now looks like;
var lastRow = Form.resolveNode("Info["+(_Info.count - 1)+"]"); // Get last row
if (lastRow.Email.isNull) // If email field empty
    xfa.host.messageBox("Please enter an email address.");
else
    lastRow.presence = "hidden";
        var newRow = _Info.addInstance();
    xfa.host.setFocus(newRow.Name.somExpression); // set focus to Name field on the row just added
So whenever you add a row the previous one is hidden?
For your second issue, if you could have another button on your form, you could ask the user for a password and if they enter it correctly then show for the Info subforms, so;
var response = app.response({ cQuestion: "Do you want to see all respones?",
                              cTitle: "Unlock Form",
                              bPassword: true,
                              cLabel: "Please enter the password:" });
if (response === "Password")
    var infoSubforms = Form.resolveNodes("Info[*]");
    for (var i = 0; i < infoSubforms.length; i++)
                var infoSubform = infoSubforms.item(i);
        infoSubform.presence = "visible";
You would want to password protect your template as well (in Form ... Form Properties ... PDF Security) so people couldn't just open the form and look at the password.
Probably the simplest approach.
Hope this helps
Bruce