Chrome 文件上传错误:更改事件不会对同一个文件执行两次 [英] Chrome file upload bug: on change event won't be executed twice with the same file

问题描述

我正在开发这个 html5 文件上传器插件，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.

I am working on this html5 file uploader plugin but it has a bug on Google Chrome which I can't understand and fix it. It works fine on Firefox.

jsfiddle 链接

问题是您无法从桌面上传同一个文件两次.

The problem is that you cannot upload the same file twice from your desktop.

当您第一次点击、选择并点击确定"从桌面上传文件时，它应该会提醒一条消息，例如.button-1" - 取决于您点击的上传按钮.

When you first click, select, and hit OK to upload a file from your desktop, it should alert a message, for instance '.button-1' - depends on which upload button you click.

那么如果你再次尝试上传同一个文件，这行代码就不会再执行了，

Then if you try to upload the same file again, this line of code won't be executed anymore,

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

             ...
             ...

             alert($cm.selector);

});

知道这个插件出了什么问题吗?

Any idea what goes wrong in this plugin?

(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 上运行正常，但最近失败了，可能 Chrome 已将最新版本更新到我的机器上，此更新导致了错误?

It was working OK on Chrome but just failed recently, probably Chrome has updated a latest version to my machine and this update causes the bug?

推荐答案

是的.我的 Chrome 与 Firefox 的行为不同，但我认为 Chrome 是正确的.

Yes. My Chrome has different behavior to Firefox, but I think Chrome is correct.

根据 W3C 的文档:

onchange 事件发生在控件失去输入焦点并且其值在获得焦点后被修改时发生

onchange event occurs when a control loses the input focus and its value has been modified since gaining focus

如果你尝试上传同一个文件，文件输入的值不会改变.尝试打印出来:

if you try to upload the same file, the value of file input does not change. Try to print it out:

$('.button-2').click(function(){
    console.log($(".list .upload-file").val())
    return false;
});

这篇关于Chrome 文件上传错误:更改事件不会对同一个文件执行两次的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！