jquery - Chrome 文件上传错误 : on change event won't be executed twice with the same file

Question

我正在研究这个 html5 文件 uploader 插件，但它在 Google Chrome 上有一个错误，我无法理解并修复它。它在 Firefox 上运行良好。

jsfiddle link

问题是您不能从桌面上传同一个文件两次。

当您第一次点击、选择并点击“确定”以从桌面上传文件时，它应该会提示一条消息，例如“.button-1”——取决于您点击的上传按钮。

然后如果你尝试再次上传同一个文件，这行代码将不再执行，

$(".upload-file",object_parent).change(function() {

             ...
             ...

             alert($cm.selector);

});

知道这个插件出了什么问题吗？

(function($){

    // Attach this new method to jQuery
    $.fn.extend({ 

        // This is where you write your plugin's name
        upload_file_html5: function(options) {

            // Set the default values, use comma to separate the settings, example:
            var defaults = {
                objectSuperparent:    '.media'
            }

            var options =  $.extend(defaults, options);
            var o = options;

            var $cm = this.click(function(e){

                // <a> button is the object in this case.
                var object = $(this);

                // Get other info from the element belong to this object group.
                var object_href = object.attr('href');
                var object_parent = object.parent();
                alert($cm.selector);

                // Trigger the click event on the element.
                // Due to security policies triggering click on the input type=file is not allowed/supported in some browsers and Opera is one of them.
                //$('input[type=file]').trigger('click'); // or:
                $(".upload-file",object_parent).click();

                return false;

            });

            // Trigger ajax post when ever the file is changed by the user.
            var $cm_2 = $(".upload-file").change(function(){

                // <input> is the object in this case.
                var object = $(this);

                var object_form = object.parent();
                var object_superparent = object.parents(o.objectSuperparent);
                var path_config = $($cm.selector,object_superparent).attr('href');
                var path_post = object_form.attr('action');

                alert($cm.selector);
                //alert(path_config);

                ....
                ....

            });

        }
    });

})(jQuery);

它在 Chrome 上工作正常，但最近失败了，可能是 Chrome 已经为我的机器更新了最新版本，而这个更新导致了这个错误？

Answer 1

如果要上传两次，清空文件输入值

$('input[type="file"]').val(null);

jsfiddle test