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from ga4mp.item import Item
class Event(dict):
def __init__(self, name):
self.set_event_name(name)
def set_event_name(self, name):
if len(name) > 40:
raise ValueError("Event name cannot exceed 40 characters.")
self["name"] = name
def get_event_name(self):
return self.get("name")
def set_event_param(self, name, value):
# Series of checks to comply with GA4 event collection limits: https://support.google.com/analytics/answer/9267744
if len(name) > 40:
raise ValueError("Event parameter name cannot exceed 40 characters.")
if name in ["page_location", "page_referrer", "page_title"] and len(str(value)) > 300:
raise ValueError("Event parameter value for page info cannot exceed 300 characters.")
if name not in ["page_location", "page_referrer", "page_title"] and len(str(value)) > 100:
raise ValueError("Event parameter value cannot exceed 100 characters.")
if "params" not in self.keys():
self["params"] = {}
if len(self["params"]) >= 100:
raise RuntimeError("Event cannot contain more than 100 parameters.")
self["params"][name] = value
def get_event_params(self):
return self.get("params")
def delete_event_param(self, name):
# Since only 25 event parameters are allowed, this will allow the user to delete a parameter if necessary.
self["params"].pop(name, None)
def create_new_item(self, item_id=None, item_name=None):
return Item(item_id=item_id, item_name=item_name)
def add_item_to_event(self, item):
if not isinstance(item, dict):
raise ValueError("'item' must be an instance of a dictionary.")
if "items" not in self["params"].keys():
self.set_event_param("items", [])
self["params"]["items"].append(item)
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