JQuery-File-Upload客户端使用coffeescript调整图像大小

Question

I'd like to implement client side image resizing using Jquery-File-Upload :

https://github.com/blueimp/jQuery-File-Upload/wiki/Client-side-Image-Resizing

I'd like to implement it in coffeescript, though, to use with some file uploading code I found from this railscast:

http://railscasts.com/episodes/383-uploading-to-amazon-s3

I'm not sure how to incorporate the disableImageResize example with coffeescript. This is what I have, which doesn't work (I can run the app, but it doesn't seem to do any resizing):

jQuery ->
  $('#new_image').fileupload
    dataType: "script"     
    disableImageResize: /Android(?!.*Chrome)|Opera/
                .test(window.navigator && navigator.userAgent),
            imageMaxWidth: 667,
            imageMaxHeight: 667
    add: (e, data) ->
      types = /(\.|\/)(gif|jpe?g|png)$/i
      file = data.files[0]
      if types.test(file.type) || types.test(file.name)
        $('#images').append('<div class="placeholder"></div>');
        $('.placeholder').hide();
        data.context = $(tmpl("template-upload", file))
        $('#imageUploadProgress').append(data.context)
        data.submit()       
      else
        alert("#{file.name} is not a gif, jpeg, or png image file")
    progress: (e, data) ->
      if data.context
        progress = parseInt(data.loaded / data.total * 100, 10)
        data.context.find('.bar').css('width', progress + '%')
        if progress == 100
           $('.placeholder').show();
           # scroll to the bottom of the thumbGallery to show recently uploaded image
           document.getElementById("images").scrollTop = document.getElementById("images").scrollHeight

Can someone tell me what I'm doing incorrectly? I found other StackOverflow questions about the same topic, but both are unanswered:

How to resize images client side using jquery file upload

Resizing image at client-side using JQuery file upload to amazon S3

Answer 1

The simple way is to remove the add callback. Otherwise, you're responsible for triggering the resize manually, which I have yet to find out how to do!