![]() ![]() This parameter is usually named e or event. When using event handlers in Javascript, the handler expects a parameter to be declared for the event object. ![]() Not defining a variable or parameter before referencing it is one of the most common triggers for reference errors. The Javascript ReferenceError is thrown when an attempt is made to reference a non-existing or out of scope variable. What Causes Javascript ReferenceError: Event is Not Defined For example, if on an onclick event, the handler does not declare the event parameter, this error is thrown. The ReferenceError: event is not defined usually occurs while using an event handler if the event parameter is either not declared or declared incorrectly. The Javascript ReferenceError occurs when referencing a variable that does not exist or has not yet been initialized in the current scope.
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