scripting - cannot access textfield if its value is empty

[Former Community Member]

I'd like to perform some operations on textfields' values.

I cannot do these if the value of these is empty.

To clarify, I have a textfields with binding pointing to xml data.

So in binding I have somthing like $.root.branch.element.

And xml like

<root><branch><element>value</element></branch></root>

If value is set and I perform script:

xfa.host.messageBox(xfa.resolveNode('page.table.row.TxtElement').rawValue);

I get the Message with the value.

If XML is set like this instead:

<root><branch><element></element></branch></root>

when I perform script:

xfa.host.messageBox(xfa.resolveNode('page.table.row.TxtElement').rawValue);

nothing happens. No message.

[radzmar · Accepted solution]

You can add a check for null values, to make this work.

var oField = xfa.resolveNode('page.table.row.TxtElement');
if (oField.isNull) {
    xfa.host.messageBox("The field is empty");
} else {
    xfa.host.messageBox(oField.rawValue);
}