Gets a URL parameter by name. Note that if the given parameter name is present more than once
in the query string, the returned value will be the first occurrence of that parameter name. To get all
instances of the parameter, use getParameterArray().
Parameters
parameterName: string
The name of the URL parameter.
Returns any
The value of the named parameter, or undefined of the parameter is not present.
Gets a URL parameter by name. Note that if the given parameter name is present more than once in the query string, the returned value will be the first occurrence of that parameter name. To get all instances of the parameter, use getParameterArray().