How to write ternary operator condition in jQuery?

Question

In this fiddle http://jsfiddle.net/mjmitche/6nar4/3/, if you drag, for example, the little blue box into the yellow box, then the big black box will turn pink. All of the 4

Answer 1

The Ternary operator is just written as a boolean expression followed by a questionmark and then two further expressions separated by a colon.

The first thing that I can see that you have got wrong is that your first expression isn't returning a boolean or anything sensible that could be converted to a boolean. Your first expression is always going to return a jQuery object that has no sensible interpretation as a boolean and what it does convert to is probably an unchanging interpretation. You are always best off returning something that has a well known boolean interpretation, if nothign else for the sake of readability.

The second thing is that you are putting a semicolon after each of your expressions which is wrong. In effect this is saying "end of construct" and so is breaking your ternary operator.

In this situation though you probably can do this a more easy way. If you use classes and the toggleClass method then you can easily get it to switch a class on and off and then you can put your styles in that class definition (Kudos to @yoavmatchulsky for suggesting use of classes up there in comments).

A fiddle of this is found here: http://jsfiddle.net/chrisvenus/wSMnV/ (based on the original)