The typeid=0 is a valid and common value representing "Automatic, based
on launch URL" type. In that case, no record in the lti_types table is
found. Thence attempting to access its toolproxyid property used to
throw PHP notice.
Previously, the Check button was often shown disabled when it
could not be used (e.g. when the question was finished, or when an
interactive question was in the try-again state). Eventually we
realised it was better usability to hide it in these cases.
Note that when a teacher reviews an in-progress quiz attempt, they will
see a disabled Check button if the student doing the quiz can see the
button.
jQuery ajax requests containing multiple '?' get replaced with a
string similar to jQuery152330039032_1231231, this is because it
is processing a stringified data object as jsonp and thinks its a url.
workaround is to add contenttype
see https://github.com/jquery/jquery/issues/1799
This is required for when helpers include json-encoded variables as arguments.
As an example, imagine a template with content:
{{# str }} somekey, someidentifier, { "fullname": "{{ fullname }}" } {{/ str }}
If the fullname variable were to include the double-quote character (e.g.
John "Trevor" Doe) because of the way in which mustache renders content, it
would become:
{{# str }} somekey, someidentifier, { "fullname": "John "Trevor" Doe" } {{/ str }}
This results in an invalid JSON structure.
To work around this issue, the quote characters in the passed variable
must be escaped:
{{# str }} somekey, someidentifier, { "fullname": "John \"Trevor\" Doe" } {{/ str }}
Unfortunately, Mustache provides no way of doing so natively.
With this function, we can quote the text as appropriate:
{{# str }} somekey, someidentifier, { "fullname": {{# quote }}{{ fullname }}{{/ quote }} } {{/ str }}
This also handles the case where the quoted content includes the Mustache
delimeter ({{ or }}).
For example:
fullname = 'John "}}Trevor{{" Doe'
Ordinarily this would be rendered as:
{{# str }} somekey, someidentifier, { "fullname": "John "}}Trevor{{" Doe" } {{/ str }}
This rendering is both a JSON error, and also a mustache syntax error because of the mustache delimeters.
The quote helper also escapes these by wrapping them in change delimeter
tags:
{{# str }} somekey, someidentifier, { "fullname": "John "{{=<% %>=}}}}<%={{ }}=%>Trevor{{=<% %>=}}{{{{=<% %>=}}" Doe" } {{/ str }}
