首页 > 解决方案 > 烧瓶 request.files 返回 ImmutableMultiDict([])

问题描述

我已经尝试了一百万次来让这个工作。我正在制作一个网络应用程序,并且我有一个按钮(模态)弹出,用户输入名称并上传文件。当用户点击 Save Well 时。request.files 返回 ImmutableMultiDict([])

这是按钮:

按钮添加新井

网页上的模态代码:

  $(document).ready(function(){
	$('#SaveNewWellButton').on('click', function(e){
		
    e.preventDefault()
    $.ajax({
		url:'./createNewWellfolder',
        type:'post',
        data:{'newWellNameImported':$("#newWellNameImported").val(), 
		      'WTTcsvfile':$("#WTTcsvfile").val()
		},
		success: function(data){
				//$("#result").text(data.result)
				$('#selectWell').html(data)
				alert( "New well created" );
			},
			error: function(error){
				console.log(error);
			}
        });
    });
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<span class="table-add float-right mb-3 mr-2" data-toggle="modal" data-target="#myModal"> 
  <button type="submit" class="btn btn-success">Add New Well</button></span>
  <!-- The Modal -->
  <div class="modal fade" id="myModal">
    <div class="modal-dialog modal-dialog-centered">
      <div class="modal-content">
      
        <!-- Modal Header -->
        <div class="modal-header">
          <h4 class="modal-title">Import CSV file:</h4>
          <button type="button" class="close" data-dismiss="modal">&times;</button>
        </div>
        
        <!-- Modal body -->
		<form action="/createNewWellfolder" method="post" enctype="multipart/form-data">
        <div class="modal-body">
          Name of well:<input type="text" id="newWellNameImported" class="form-control"></input>
        </div>
        
        <!-- Modal footer -->
        <div class="modal-footer">
		<input type="file" name="csvfile" value ="csvfile" id="csvfile">
		</br>
		  <button type="submit" class="btn btn-primary" id="SaveNewWellButton">Save Well</button>
          <button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>
        </div>
		 </form>
        
      </div>
    </div>
  </div>

python代码如下所示:

@app.route('/createNewWellfolder', methods=['GET', 'POST'])
def createNewWellfolder():
    print('request.method : %s',  request.method)
    print('request.files : %s', request.files)
    print('request.args : %s', request.args)
    print('request.form : %s', request.form)
    print('request.values : %s', request.values)

终端输出:

    request.method : %s POST
    request.files : %s ImmutableMultiDict([])
    request.args : %s ImmutableMultiDict([])
    request.form : %s ImmutableMultiDict([('newWellNameImported', 'Sample Well 14')])
    request.values : %s CombinedMultiDict([ImmutableMultiDict([]), ImmutableMultiDict([('newWellNameImported', 'Sample Well 14')])])

只想添加以下代码有效。但是我怎样才能让它在我更大的网络应用程序上工作呢?我想这与app.route有关。但是我尝试了很多东西,比如使用 url_for 将其添加到操作表单中。似乎没有任何效果。

import os
from flask import Flask, flash, send_from_directory, request, redirect, url_for
from werkzeug.utils import secure_filename
from os.path import dirname, join

DATA_DIR = join(dirname(__file__), 'data/')
wellNames = next(os.walk('data'))[1]

print(DATA_DIR, wellNames[0])

UPLOAD_FOLDER = DATA_DIR + wellNames[0] + '/uploads'
ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'csv', 'docx'])

app = Flask(__name__)

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER

def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

@app.route('/', methods=['GET', 'POST'])
def createNewWellfolder():

    if request.method == 'POST':
        print('------------->', request.files)
    # check if the post request has the file part
        if 'csvfile' not in request.files:
            flash('No file part')
        file = request.files['csvfile']
        print('------------->', file)

        if file.filename == '':
            flash('No selected file')
        if file and allowed_file(file.filename):
            print('hello im here------------->', file)
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))

    return '''
    <!-- Modal body -->
    <form method=post enctype=multipart/form-data>
    <div class="modal-body">
      Name of well:<input type="text" id="newWellNameImported" class="form-control"></input>
    </div>

    <!-- Modal footer -->
    <div class="modal-footer">
    <input type=file name="csvfile" id="csvfile" >
    </br>
      <button type="submit" class="btn btn-primary" id="SaveNewWellButton" >Save Well</button>
      <button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>
    </div>
     </form>
     '''    
   if __name__ == '__main__':
        print('Opening single process Flask app with embedded Bokeh application on http://localhost:8000/')
        app.secret_key = 'secret key'
        app.debug = True
        app.run(port = 8000)

终端输出:

-------------> ImmutableMultiDict([('csvfile', <FileStorage: 'testcsv.csv' ('application/vnd.ms-excel')>)])
-------------> <FileStorage: 'testcsv.csv' ('application/vnd.ms-excel')>
hello im here-------------> <FileStorage: 'testcsv.csv' ('application/vnd.ms-excel')>

标签: pythonjqueryflaskfile-uploadrequest

解决方案


你介意再详细说明一下这个问题吗?Flask Request 预计会返回一个 ImmutableMultiDict:

包含所有上传文件的 MultiDict 对象。文件中的每个键都是<input type="file" name="">. files 中的每个值都是 Werkzeug FileStorage 对象。

它的行为基本上类似于你从 Python 中知道的标准文件对象,不同之处在于它还有一个save()可以将文件存储在文件系统上的函数。

POST请注意,仅当请求方法是, PUT或者发布到 请求PATCH的方法是时,文件才会包含数据。否则它将为空。<form>enctype="multipart/form-data"

有关使用的数据结构的更多详细信息,请参阅 MultiDict / FileStorage 文档。

http://flask.pocoo.org/docs/1.0/api/#flask.Request.files


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