javascript – 如何在Ipython Notebook中制作多文件上传小部件?

我想在Ipython Notebook 3.x或4.x(Jupyter,Python 3)中创建一个用于远程文件上传的小部件,允许用户在上传时在浏览器的文件选择器中选择多个文件.不幸的是,我对javascript方面没有任何线索.

我发现blueimp’s widgets,但是,我不知道如何在笔记本电脑中使用它们.

This是如何制作单个文件上传小部件:

import base64
from __future__ import print_function # py 2.7 compat.
from IPython.html import widgets # Widget definitions.
from IPython.utils.traitlets import Unicode # Traitlet needed to add synced attributes to the widget.
class FileWidget(widgets.DOMWidget):
    _view_name = Unicode('FilePickerView', sync=True)
    value = Unicode(sync=True)
    filename = Unicode(sync=True)

    def __init__(self, **kwargs):
        """Constructor"""
        widgets.DOMWidget.__init__(self, **kwargs) # Call the base.

        # Allow the user to register error callbacks with the following signatures:
        #    callback()
        #    callback(sender)
        self.errors = widgets.CallbackDispatcher(accepted_nargs=[0, 1])

        # Listen for custom msgs
        self.on_msg(self._handle_custom_msg)

    def _handle_custom_msg(self, content):
        """Handle a msg from the front-end.

        Parameters
        ----------
        content: dict
            Content of the msg."""
        if 'event' in content and content['event'] == 'error':
            self.errors()
            self.errors(self)
%%javascript

require(["widgets/js/widget", "widgets/js/manager"], function(widget, manager){

    var FilePickerView = widget.DOMWidgetView.extend({
        render: function(){
            // Render the view.
            this.setElement($('<input />')
                .attr('type', 'file'));
        },

        events: {
            // List of events and their handlers.
            'change': 'handle_file_change',
        },

        handle_file_change: function(evt) { 
            // Handle when the user has changed the file.

            // Retrieve the first (and only!) File from the FileList object
            var file = evt.target.files[0];
            if (file) {

                // Read the file's textual content and set value to those contents.
                var that = this;
                var file_reader = new FileReader();
                file_reader.onload = function(e) {
                    that.model.set('value', e.target.result);
                    that.touch();
                }
                file_reader.readAsText(file);
            } else {

                // The file couldn't be opened.  Send an error msg to the
                // back-end.
                this.send({ 'event': 'error' });
            }

            // Set the filename of the file.
            this.model.set('filename', file.name);
            this.touch();
        },
    });

    // Register the FilePickerView with the widget manager.
    manager.WidgetManager.register_widget_view('FilePickerView', FilePickerView);
});
file_widget = FileWidget()

# Register an event to echo the filename when it has been changed.
def file_loading():
    print("Loading %s" % file_widget.filename)
file_widget.on_trait_change(file_loading, 'filename')

# Register an event to echo the filename and contents when a file
# has been uploaded.
def file_loaded():
    print("Loaded, file contents: %s" % file_widget.value)
file_widget.on_trait_change(file_loaded, 'value')

# Register an event to print an error message when a file could not
# be opened.  Since the error messages are not handled through
# traitlets but instead handled through custom msgs, the registration
# of the handler is different than the two examples above.  Instead
# the API provided by the CallbackDispatcher must be used.
def file_failed():
    print("Could not load file contents of %s" % file_widget.filename)
file_widget.errors.register_callback(file_failed)

file_widget
最佳答案
这个问题https://github.com/ipython/ipython/issues/8383部分回答了你的问题.在仪表板屏幕上,jupyter 4.0中已经有可用的上传按钮.此上传按钮支持选择多个文件.

请注意,最新的链接位于此处用于上传小部件:

https://github.com/ipython/ipywidgets/blob/master/docs/source/examples/File%20Upload%20Widget.ipynb

还有一个扩展可用于下载和快速安装在您的笔记本中:

https://github.com/peteut/ipython-file-upload

pip install fileupload

要么

pip install git+https://github.com/peteut/ipython-file-upload

请注意,根据作者的说法,该扩展程序被确认仅在linux上工作.

转载注明原文:javascript – 如何在Ipython Notebook中制作多文件上传小部件? - 代码日志