javascript - jQuery - change for only clicked element, not all with the same class

Question

What I would like to do is change an object's attribute, but for only that one. So something like, $('.up img').attr("src","img/up.png") for the one that has been clicked, not all the elements that have .up img.

jQuery:

$('.up img').click( function(){
        var postDataUp = $(this).attr('mod');
        $.post('/votePost.php', {varUp: postDataUp}, function(o){
            console.log(o);
            if(o == 1){
                $('.up img').attr("src","img/up.png");
            }else if(o == 2){
                $('.up img').attr("src","img/up-g.png");
                $('.down img').attr("src","img/dw.png");
            }else if(o == 3){
                $('.up img').attr("src","img/up.png");
            }
        }, 'json');
});

Answer 1

Use $(this) instead to target only the particular element of that class which was clicked on, instead of using the class selector.

$('.up img').click( function(){
        var postDataUp = $(this).attr('mod');
        $.post('/votePost.php', {varUp: postDataUp}, function(o){
            console.log(o);
            if(o == 1){
                $(this).attr("src","img/up.png");
            }else if(o == 2){
                $(this).attr("src","img/up-g.png");
                $('.down img').attr("src","img/dw.png");
            }else if(o == 3){
                $(this).attr("src","img/up.png");
            }
        }, 'json');
});