HTML code for positioning an image after resizing

Within an HTML page, I have an image that has been resized to a width of 400px using CSS.

.cropbox {
width: 400px;
height : auto;
}

Additionally, there is a JavaScript function associated with the image that allows users to select a point on the image. The coordinates of this selection are relative to the resized image. But, how can I obtain the coordinates relative to the original image?

Is there a calculation that can be used such as newx = originalwidth/400 * x? If so, how would I determine the original width of the image?

Answer №1

As far as I know, determining the physical dimensions of an image using JavaScript alone is not possible. This calculation must be done on the server side.

Answer №2

Is there a way to determine the original width of an image?

Unfortunately, there is no direct method for finding the original width of an image within the page. One workaround is to create a new img element for the unresized version of the image, insert it into the page, and then measure its offsetWidth. Alternatively, you could include the image unresized in the page's markup from the beginning, and then use a script on body onload to calculate the natural size of the image and apply any necessary resizing.

Answer №3

To optimize the loading of your image, consider allowing it to load without any width applied and then recording its dimensions. Server-side scripting is not necessary for this task, as you can follow these steps:

  1. Hide the original image to prevent any visual glitches during resizing (optional step).
  2. Allow the image to load and record its dimensions onload.
  3. Resize the image once it has finished loading.
  4. Retrieve and display both the original and current dimensions.

Here is a jQuery code snippet that accomplishes this:

<img id="myImage" style="display:none;" src="http://www.google.com/intl/en_ALL/images/logo.gif" alt="Google!" />
<div id="status"></div>
<script type="text/javascript">
    var ImageModifier = {
        WIDTH: 400,
        Original: null,
        Init: function() {
            $(function(){
                $('#myImage').load(function(){
                    //remember original size
                    ImageModifier.Original = { width: $(this).width(), height: $(this).height()}

                    //Resize the image
                    $(this).css("width", ImageModifier.WIDTH);

                    //print info after resize
                    ImageModifier.Info(this);

                    //show the image
                    $(this).css("display", "block");
                });
            });
        },

        Info: function(obj){
            $('#status').append("Original Size: [" + ImageModifier.Original.width + "x" + ImageModifier.Original.height +"]" + 
                  "<br />Current size: [" + $(obj).width() + "x" + $(obj).height() +"]<br />");
        }
    }
    ImageModifier.Init();
</script>

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