Why is my Flask Form Data not Being Submitted?

Submitting Form Values in Flask

To post and retrieve form values effectively in a Flask application, verify that your form elements have a unique and informative name attribute.

Problem:

In the provided code, the form fields lack the name attribute, causing request.form to remain empty and resulting in a 400 error when attempting to access values by ID.

<pre class="lang-html prettyprint-override"><input id="my_input" type="text" value="{{ email }}">
  <input id="my_submit" type="submit" value="Submit">
</form>

Solution:

Attribute appropriate name values to your input elements:

<pre class="lang-html prettyprint-override"><input name="my_input" id="my_input" type="text" value="{{ email }}">

Once this is implemented, Flask will correctly interpret the submitted form data and make it accessible through request.form:

@app.route('/page', methods=['POST', 'GET'])
def get_page():
    if request.method == 'POST':
        print(request.form)  # prints ImmutableMultiDict({ 'my_input': {{ email }}})
        print(request.form['my_input'])  # displays the value of 'my_input'
    return render_template('page.html')

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