Jquery - When to use “this” and when to use “$(this)”? [duplicate]

Answer 1

this is for javascript, $(this) for jQuery. you can use $(this) for every functions of jQuery, not the case for this.

Edit: For your example the i is just the incremented number that he is on (0 the 1st 10 the 11the) the $(this) is the element img precisely you can do either :

$(this).on('click', function() { console.log(123); });
or
$('img').eq(i).on('click', function() { console.log(123); });

Edit2: Here is a usage of this:

var sorter = {
    sort: function() {
        console.log('sorting');
    },
    requestSorting: function() {
        this.sort();
    }
}
sorter.requestSorting.bind(sorter);

In this example it's exactly used like the $this in PHP class. That's why I said it's more for pure javascript functions.