use jQuery to get 'true size' of image without removing the class

StackOverflow https://stackoverflow.com/questions/4631648

Question

I am using Jcrop on an image that is resized with css for uniformity.

JS

<script type="text/javascript">
    $(window).load(function() {
        //invoke Jcrop API and set options
        var api = $.Jcrop('#image', { onSelect: storeCoords, trueSize: [w, h] });
        api.disable(); //disable until ready to use

        //enable the Jcrop on crop button click
        $('#crop').click(function() {
            api.enable();
        });
    });
    function storeCoords(c) {
    $('#X').val(c.x);
    $('#Y').val(c.y);
    $('#W').val(c.w);
    $('#H').val(c.h);
    };
</script>

HTML

<body>
    <img src="/path/to/image.jpg" id="image" class="img_class" alt="" />
     <br />
     <span id="crop" class="button">Crop Photo</span>
     <span id="#X" class="hidden"></span>
     <span id="#Y" class="hidden"></span>
     <span id="#W" class="hidden"></span>
     <span id="#H" class="hidden"></span>
</body>

CSS

body { font-size: 13px; width: 500px; height: 500px; }
.image { width: 200px; height: 300px; }
.hidden { display: none; }

I need to set the h and w variables to the size of the actual image. I tried using the .clone() manipulator to make a copy of the image and then remove the class from the clone to get the sizing but it sets the variables to zeros.

var pic = $('#image').clone();
pic.removeClass('image');
var h = pic.height();
var w = pic.width();

It works if I append the image to an element in the page, but these are larger images and I would prefer not to be loading them as hidden images if there is a better way to do this. Also removing the class, setting the variables, and then re-adding the class was producing sporadic results.

I was hoping for something along the lines of:

$('#image').removeClass('image', function() {
    h = $(this).height();
    w = $(this).width();
}).addClass('image');

But the removeClass function doesn't work like that :P

Was it helpful?

Solution

Try hiding the image, then take the dimensions, then show it:

var $img = $("#image");
$img.hide().removeClass("image");
var width = $img.width();
var height = $img.height();
$img.addClass("image").show();

This should remove any weird behavior you might see while adding and removing the class.

OTHER TIPS

Maybe you can clone the image (should not be extremely network-painful, because it should be cached), and get the size of the cloned one:

$newImg = $("#image").clone();
$newImg.css("display", "none").removeClass("image").appendTo("body");
var width = $newImg.width(), height = $newImg.height();
$newImg.remove();

Good luck!

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