How to get the selected value of a bootstrap dropdown in code using Python & Flask?

I have accomplished more or less what you're looking for without JS by using the syntax variable = form_name.form_field.data (in routes.py).

I hope this helps.

Edited:

Probably best to access the form's attributes directly.Also,

forms.py:

class IndexForm(FlaskForm):      car_options = SelectMultipleField(                 u'Select Color', choices=[('Red', 'red'), ('Blue', 'blue'), ('Green', 'green')], size=1)      submit = SubmitField('Submit')

index.html:

    <form action='/' , method='POST'>        {{form.hidden_tag() }}        <button class="btn btn-info btn-md dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" name="color_dropdown" >            Select Color            <span class="caret"></span>            </button>        <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">        {% for subfield in form.choices %}              <a class="dropdown-item" href="#">              {{ subfield.label }}              </a>        {% endfor %}        </div>        <div class="submit">            {{ form.submit(class="btn btn-info") }}        </div>    </form>

routes.py:

@app.route("/index", methods=['GET','POST'])   def index():       form = IndexForm()       if form.validate_on_submit():           color_choice = form.car_options.data           if color_choice = 'green':               print("Sick bro")           else:               pass           #since you can access the choices as an attribute of the form,           #there is no need to define "posts" (I named it color choice) unless            #you are going to use it here.           return redirect('index.html')       return render_template('index.html', title='My Form', form=form, data=data)