Javascript 如何捕获dropzonejs插件的事件

我使用插件。 现在我在html文档中编写此代码

<form action="<?php print $this->link('task', 'upload'); ?>" id="pinupload" class="dropzone" style="width:450px;">
                        </form>

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但使用此代码，我无法捕获事件。为什么？

对不起，代码在工作，只是我没注意。表单的Id应具有“myDropzone”

Dropzone.options.myDropzone = {
    init: function() {
      this.on("addedfile", function(file) {

       // Capture the Dropzone instance as closure.
        var _this = this;

        // Listen to the click event
        removeButton.addEventListener("click", function(e) {
          // Make sure the button click doesn't submit the form:
          e.preventDefault();
          e.stopPropagation();

          // Remove the file preview.
          _this.removeFile(file);
          // If you want to the delete the file on the server as well,
          // you can do the AJAX request here.
        });
      });
    }
  };