调用Javascript中的Python函数，读取静态文件(Flask）

Calling Python function in Javascript, reading static files (Flask)

本文关键字：文件 静态 Flask 读取 Javascript 中的 Python 函数 调用      更新时间：2023-09-26

我正在基于用户选择的json文件创建一个d3可视化，如下所示-

d3.json("/data", function(error, graph)

这是views.py 中的应用程序路线

    @app.route("/data") #the javascript will call this
def data():
        return(userInput.get_data()) #returns the return value of given function

在表单中，我有一个userInput类，它包含一个下拉列表。该列表由json文件的名称组成。json_fileCrew是用户选择的json文件的名称。

json_fileCrew = SelectField(u"Filename", choices=[(f, f) for f in filenamesCrew])

在这个类中，我有get_data函数：

def get_data(json_fileCrew):
        return send_from_directory ("/project/myproject/app/static/Crews" , json_fileCrew)

因此，当javascript调用/data时，它应该返回json_fileCrew，但我得到了这个错误

File "'project'myproject'app'views.py", line
34, in data
    return(userInput.get_data()) #returns the return value of given function
TypeError: get_data() missing 1 required positional argument: 'json_fileCrew'

这是完整的Traceback-

Traceback (most recent call last):
  File "C:'Python34'lib'site-packages'flask'app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:'Python34'lib'site-packages'flask'app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "C:'Python34'lib'site-packages'flask'app.py", line 1403, in handle_except
ion
    reraise(exc_type, exc_value, tb)
  File "C:'Python34'lib'site-packages'flask'_compat.py", line 33, in reraise
    raise value
  File "C:'Python34'lib'site-packages'flask'app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "C:'Python34'lib'site-packages'flask'app.py", line 1477, in full_dispatch
_request
    rv = self.handle_user_exception(e)
  File "C:'Python34'lib'site-packages'flask'app.py", line 1381, in handle_user_e
xception
    reraise(exc_type, exc_value, tb)
  File "C:'Python34'lib'site-packages'flask'_compat.py", line 33, in reraise
    raise value
  File "C:'Python34'lib'site-packages'flask'app.py", line 1475, in full_dispatch
_request
    rv = self.dispatch_request()
  File "C:'Python34'lib'site-packages'flask'app.py", line 1461, in dispatch_requ
est
    return self.view_functions[rule.endpoint](**req.view_args)
  File "'project'myproject'app'views.py", line
34, in data
    return(userInput.get_data()) #returns the return value of given function
TypeError: get_data() missing 1 required positional argument: 'json_fileCrew'

您有一个方法

def get_data(json_fileCrew)

但你并没有用必需的参数来调用它

return(userInput.get_data())

因为错误告诉你

TypeError: get_data() missing 1 required positional argument: 'json_fileCrew'
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