.animate() callback function executed immediately if the function has .apply()

[anonymous]

$('#id').animate(

{

'height':'toggle'

}, 5000, 'linear', function(){

console.log(1)

}.apply(this)

});

This function would console.log(1) when the animation starts instead of when it is complete. This is down to the .apply() as when it is removed the callback executes at the correct moment.

[dmethvin]

I agree with your analysis, which is why this code is not related to any jQuery problem. It is explicitly running the function immediately rather than passing a function object to .animate() for later callback.