Enhancing Image Upload with Ajax/JavaScript: Generating Multiple Previews

I've been experimenting with an Ajax image uploader that I found on this website. Currently, I have managed to create duplicate preview images: one displayed under the input field and the other elsewhere on the page labeled as "this what you chose". However, a problem arises when the user selects a file, changes their selection, and ends up with both old and new images being displayed in the yourCustomPreview.

Is there a way to only show the most recent preview picture without the previous one lingering? For more clarity, please refer to the source files here

uploaderPreviewer.js- Original function

<script>
function displayImage($previewDiv, imageUrl) {

    var imageFilename = imageUrl.substr(imageUrl.lastIndexOf('/') + 1);

    $previewDiv
        .removeClass('loading')
        .addClass('imageLoaded')
        .find('img')
        .attr('src', imageUrl)
        .show();
    $previewDiv
        .parents('table:first')
        .find('input:hidden.currentUploadedFilename')
        .val(imageFilename)
        .addClass('imageLoaded');
    $previewDiv
        .parents('table:first')
        .find('button.removeImage')
        .show();
}
</script>

uploaderPreviewer.js- Modified function

<script>
    function displayImage($previewDiv, imageUrl) {
    //New
    var yourCustomPreview = $('#custompreview');

    var imageFilename = imageUrl.substr(imageUrl.lastIndexOf('/') + 1);

    $previewDiv
        .removeClass('loading')
        .addClass('imageLoaded')
        .find('img')
        .attr('src', imageUrl)
        .show();
    $previewDiv
        .parents('table:first')
        .find('input:hidden.currentUploadedFilename')
        .val(imageFilename)
        .addClass('imageLoaded');
    $previewDiv
        .parents('table:first')
        .find('button.removeImage')
        .show();

        //New
        yourCustomPreview.append('<img src="' + imageUrl + '"/>');

    }
</script>
javascriptjqueryhtmlcssajax

Answer №1

Alright, give this a shot:

MODIFY AS FOLLOWS:

substitute the displayImage function with the following code snippet:

function displayImage($previewDiv, imageUrl) {
    //New
    var yourCustomPreview = $('#custompreview');
    var imageId = $($previewDiv.context).attr('id');
    var imageFilename = imageUrl.substr(imageUrl.lastIndexOf('/') + 1);

    $previewDiv
        .removeClass('loading')
        .addClass('imageLoaded')
        .find('img')
        .attr('src', imageUrl)
        .show();
    $previewDiv
        .parents('table:first')
        .find('input:hidden.currentUploadedFilename')
        .val(imageFilename)
        .addClass('imageLoaded');
    $previewDiv
        .parents('table:first')
        .find('button.removeImage')
        .show();

    //New
    if(!yourCustomPreview.find('#' + imageId +'_prev').length > 0)
    {
      yourCustomPreview.append('<img id="' + imageId + '_prev" src="' + imageUrl + '"/>');
    }
    else
    {
      $('#' + imageId +'_prev').attr('src', imageUrl);
    }
}

TO REMOVE

swap out the removeImage function with this updated version:

function removeImage($removeImageButton, errorDisplayed) {

    var thumbIdToDelete = $removeImageButton.parents('table').find('[name=imageToUpload]').attr('id');
    var $parent = $removeImageButton.parents('table:first').parent();

    $.post($.uploaderPreviewer.removeImageAjaxUrl, {
        currentUploadedFilename: $parent.find('input:hidden.currentUploadedFilename').val()
    });

    $parent.find('input:hidden.currentUploadedFilename').removeClass('imageLoaded');
    $parent.find('div.previewImage')
        .removeClass('loading imageLoaded')
        .find('img')
        .hide();

    $parent.removeErrorMessage();

    if ( ! errorDisplayed) {
        $parent.find('input:file').val('');
        $removeImageButton.hide();
    }

    $('#' + thumbIdToDelete +'_prev').remove();
};

Answer №2

Could caching be the culprit?

`yourCustomPreview.append('<img src="' + imageUrl+'?'+new Date().getTime() + '"/>');`

Feel free to test out this snippet!

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