Hi,

I tried to change an entry with a JS API. It looks like:

------------
var fieldName = "proceedingsTitle";
var oldValue = "63rg";
var newValue = "63rd";

var fieldID = Zotero.ItemFields.getID(fieldName);
var s = new Zotero.Search;
s.addCondition(fieldName, 'is', oldValue);
var ids = s.search();
if (ids) {
for each(var id in ids) {
var item = Zotero.Items.get(id);
var mappedFieldID = Zotero.ItemFields.getFieldIDFromTypeAndBase(item.itemTypeID, fieldName);
item.setField(mappedFieldID ? mappedFieldID : fieldID, newValue);
item.save();
}
alert(ids.length + " items updated");
}
else {
alert("No items found");
}
--------

Yes, it's a copy-paste from https://www.zotero.org/support/dev/client_coding/javascript_api
When I run it I get the following message: "Exception: Zotero.ItemFields is undefined"
What am I doing wrong?

Thanks!