Add an exists() function

[kbwood]

Rather than use the construct $('selector').length > 0 it would be more readable and require less knowledge of the inner workings to able to use $('selector').exists().

As an enhancement you could pass in an expected number of occurrences and return true only if an exact match. With no parameter it returns true if any number exist.

The code is:

exists: function( size ) {

return (size ? this.length == size : this.length > 0);

},

[Thasmo]

That sounds good - nice idea!

[balazs.endresz]

I use a similar plugin but that returns the current jQuery object or null, so it can be chained and throws an error if there isn't any match:

return (size ? this.length == size : this.length > 0) ? this : null;

And, of course, it still can be used in a conditional statement.

Though ´if( $('selector').length )´ is just as fine, I think.

[dz]

What might be more useful is an exists that takes in a function -- something like:

$('.blah').exists(function(){ alert("I exist!"); }).something_else();

[Thasmo]

What about a merge of all this, kinda: $.exists(param); $('selector').exists(param);

Where param could be a css path, a jquery object or a function, and returns either the jquery object(s) or FALSE.

[Thasmo]

Plus, 'param' is additional so it would just check it the given objects exist, like: $('#logo').exists();

[mofle]

This sounds great. Will it be in 1.4?

[dmethvin]

This is the .is() method by another name.