jQuery Animate .offset（）.position（）返回NULL

Question

I am trying to create a JQuery plug in to slide some images from right to left.

I tried to search for a plug in but i thought i'd create it myself.
What I have:
- several DIV elements like this:

<div class="footer_image_div project">
</div>

• i thought if i retrieve all the positions of the projects and animate them to 260 to the left it'd worked

I tried

$(function(){
         $('.project').each(function() {
             alert('a');
             var elm = $(this);
             elm.find(".project").animate({}, 500, function(){
                var pos = elm.find(".project").position();
                alert(pos.top);
             });

         });
      });

I did try offset aswell both do return NULL.

What should i do? Where should i look? I am confused

Answer 1

$(function(){
     $('.project').each(function() {
         alert('a');
         var elm = $(this);
         elm.animate({}, 500, function(){
            var pos = elm.position();
            alert(pos.top);
         });

     });
  });

Answer 2

// This code will work right if `.project` is not nested.

.project {
    position: absolute;
}

$('.project').each(function() {
      var elm = $(this);
      elm.animate({
         left: '+=260px'
      }, 500, function(){
         var pos = elm.position();
      });
 });