building a simple jQuery plugin

[jeancnicolas]

hello ..
I basically have a load of code using jQuery, that I now realise I have to add an if statement to every on('mouseenter') event I have depending on whether or not a boolean is true or false.
Ok - easy. But I wish to build a jQuery plugin (at the most simplest level), so that my query will continue and chain - or break. Is there a jQuery method that already exists that does that?

Otherwise::

var myBreak = true;
jQuery.fn.makeOrBreak = function(v){    
// break chain or query
if(v != true){
}else{
// keep calm and carry on
}
};
// usage example
$('#id').makeOrBreak(myBreak).hide(); // boolean is true so '#id' is allowed to chain and 'hide()'

maybe there's easier ways - but it's interesting to build a plugin. And I have around 40 mouse overs ive got to plug an if statement into ...
Any pointers!?

PS am i in the right forum?!

[Swooter]

I would write that like this:

myBreak && $("#id").hide();

This evaluates as "If myBreak == true, hide the element"

[jeancnicolas]

handy tip! Shorthand is so confusing when you start learning code - but brilliant when sailing.

Still - is it possible to break out of the chain in jQuery?

[ironikart]

Still - is it possible to break out of the chain in jQuery?

Just return something else other than the jquery collection object in the function:

jQuery.fn.test = function() {
   return false; // Breaks the chain
};

This will break the chain, but will obviously generate errors if there are function calls after it. If you know what methods are going to be called you can create a mock object that has the same methods. Your mock object to return if you knew the hide() method was going to be called would be something like this:

var mock = {
    hide: function() {
         return this;
    }
};
jQuery.fn.test = function() {
   if (true) {
       return mock;
   } else {
       return this;
   }
};