Flask receiving empty forms

I had this problem, but it was because I forgot to assign a name attribute to my input elements and I was trying to refer access the form data by the id attribute instead

i.e.

My HTML and Python was as shown below

HTML

<input type="text" id="usernameTxtBx">

Python

request.form['usernameTxtBx']

What I have done now:

HTML

<input type="text" name="username" id="usernameTxtBx">

Python

request.form['username']

I also needed to ensure that I was using a POST request. A GET request gave me an empty dictionary in my python code.

The OP made neither of these mistakes. But this may help someone that stumbles on this thread.

I had that problem. Some tools like postman or some libraries or web browser sends the data in a way that flask does not identify as posted values. From my point of view this is a flask issue.

This is the workaround I followed to solve it:1 - I sent the information using json. Have a look to this:

How to send a JSON object using html form data

2 - I instead of getting the parameters using:value = request.form["myparamname"]I used this:

json_data = request.get_json(force=True) value = json_data["myparamname"]

login.html

{% extends "layout.html" %}{% block content %}  <div class="form">    <h2>Sign In</h2> {% for field in form.errors %}{% for error in form.errors[field] %}    <div class="alert alert-error">        <strong>Oops...</strong> {{error}}.    </div>{% endfor %}{% endfor %}  <form action="{{ url_for('login') }}" method=post>    {{ form.hidden_tag() }}    {{ form.email.label }}    {{ form.email }}    {{ form.password.label }}    {{ form.password }}      <p> <input id="submit" name="submit" type="submit" class="btn btn-inverse" value="Sign In"></p>  </form></div>{% endblock %}

forms.py

  class SigninForm(Form):        email = TextField("email", [validators.Required("Please enter your email")])        password = PasswordField('Password', [validators.Required("Please enter a password.")])        submit = SubmitField("Sign In")

Then import the signinform in your views and create your login method like this

@app.route('/login', methods=['GET', 'POST'])def signin():  form = SigninForm()  if form.validate_on_submit():      session['email'] = form.email.data      flash('You are logged in')      return redirect(url_for('dashboard'))  return render_template('signin.html', form=form)

Refer this tutorial for more detailed instructionshttp://pypix.com/python/building-flask-blog-part-1/