[jquery] jQuery Loop through each div

I'm pretty sure this will be a really easy answer for you jQuery whizzes, and I'm also pretty such it involves a loop of some kind.

I'm trying to perform essentially the same calculation on two separate divs, but assigning a different CSS width value to each id based on the number of images found. The calculations I'm performing are irrelevant to my problem really, but I put them in anyway because it's the actual code I'm working with.

Here is the markup...

<div id ='test1' class='target'>
  <div class='scrolling'>
    <img/>
    <img/>
    <img/>
  </div>
</div>

<div id ='test2' class='target'>
  <div class='scrolling'>
    <img/>
    <img/>
    <img/>
  </div>
</div>

Below is my current jQuery, which works fine, but it's inefficient because I have to write another chunk of code for every div added. How can I standardise this so that it runs through every div with the class of target? Thanks

/* Measure the width of each image. */
test1 = $('#div1 .scrolling img').width();
test2 = $('#div2 .scrolling img').width();

/* Find out how many images there are. */
test1img = $('#div1 .scrolling img').length;
test2img = $('#div2 .scrolling img').length;

/* Do the maths. */
final1 = (test1 * test1img)*1.2;
final2 = (test2 * test2img)*1.2;

/* Apply the maths to the CSS. */
$('#div1 .scrolling').width(final1);
$('#div2 .scrolling').width(final2);    

What about .each()?

http://api.jquery.com/each/

You're right that it involves a loop, but this is, at least, made simple by use of the each() method:

$('.target').each(
    function(){
        // iterate through each of the `.target` elements, and do stuff in here
        // `this` and `$(this)` refer to the current `.target` element
        var images = $(this).find('img'),
            imageWidth = images.width(); // returns the width of the _first_ image
            numImages = images.length;
        $(this).css('width', (imageWidth*numImages));

    });

References:

• css().
• each().
• find().

$('div.target').each(function() {
   /* Measure the width of each image. */
   var test = $(this).find('.scrolling img').width();

   /* Find out how many images there are. */
   var testimg = $(this).find('.scrolling img').length;

   /* Do the maths. */
   var final = (test* testimg)*1.2;

   /* Apply the maths to the CSS. */
   $(this).find('scrolling').width(final); 
});

Here you loop through all your div's with class target and you do the calculations. Within this loop you can simply use $(this) to indicate the currently selected <div> tag.

Just as we refer to scrolling class

$( ".scrolling" ).each( function(){
    var img = $( "img", this );
    $(this).width( img.width() * img.length * 1.2 ) 
})