if (window.Drag) {... drag exists...}
if (window.Drag && Drag.Move) { ... Drag.Move exists ... }On Tue, Apr 28, 2009 at 1:57 PM, jonlb (via Nabble) < ml-user+57835-2049679...@n2.nabble.com<ml-user%2b57835-2049679...@n2.nabble.com> > wrote: > > So, just to be sure I understand.... If I want to be able to check > for the presence of the Drag mootools-more class (say to see if it was > included or not for optional functionality), I can't just do $defined > (Drag). I would need to use the typeof operator instead. > > So by extension, that would go for any class (even my own custom > ones). Correct? > > Thanks, > jonlb > > On Apr 28, 1:44 pm, Fábio Costa > <fabiomco...@...<http://n2.nabble.com/user/SendEmail.jtp?type=node&node=2736868&i=0>> > wrote: > > > anyFunction(undefinedValue) will always throw you an error. You can't > pass a > > non defined param to a function. > > > > For this to work you should declare the var before using the function, in > > > this case: > > > > var undefinedValue; > > anyFunction(undefinedValue); > > > > Will work. > > > > In you case: > > > > var Drag; > > $defined(Drag); > > > > Will return false. > > > > Fábio Miranda Costa > > Engenheiro de Computaçãohttp://meiocodigo.com > > > > On Tue, Apr 28, 2009 at 5:26 PM, jonlb > > <jo...@...<http://n2.nabble.com/user/SendEmail.jtp?type=node&node=2736868&i=1>> > wrote: > > > > > Hello All, > > > > > I was wondering why it is that if I try to check if a class is defined > > > by doing, for instance, $defined(Drag) it will through an error if > > > Drag wasn't available. I would expect a false rather than an error. > > > > > Am I missing something or does this seem to be counter intuitive? > > > > > Thanks, > > > jonlb > > > ------------------------------ > View message @ > http://n2.nabble.com/-Moo--question-about-%24defined-tp2736644p2736868.html > To start a new topic under MooTools Users, email > ml-node+660466-1583815...@n2.nabble.com<ml-node%2b660466-1583815...@n2.nabble.com> > To unsubscribe from MooTools Users, click here< (link removed) >. > > > ----- The MooTools Tutorial: http://www.mootorial.com www.mootorial.com Clientcide: http://www.clientcide.com www.clientcide.com -- View this message in context: http://n2.nabble.com/-Moo--question-about-%24defined-tp2736644p2736882.html Sent from the MooTools Users mailing list archive at Nabble.com.
