如何为selectfield（wtforms）烧瓶配置HTML？

Question

Good evening to everyone who reads this post. I want to add a select box to my web site in flask, but i can not understand how to set up html for that I look forward to see any comments and suggestions :)

My python code:

class selectmenu(Form):
    month = SelectField('Choose month',choices=[('dec', 'dec'), ('yan', 'yan'), ('feb', 'febt')])

@app.route('/searchemp/', methods=['GET', 'POST'])
def searchemp():
    form = selectmenu(request.form)
    m = form.month.data

HTML:

 <form action="" class="form-signin" method="post"> <h2 class="form-signin-heading" align="center">title</h2> <input type="text" class="form-control" placeholder= "username" name="username" value="{{request.form.username}}" required autofocus> <!-- <input type="text" class="form-control" placeholder= "month" name="month" value="{{request.form.month}}"> --> <select name="month"> <option value="{{request.form.month}}">dec</option> <option value="{{request.form.month}}">yanuary</option> <option value="{{request.form.month}}">feb</option> <option value="{{request.form.month}}">mar</option> </select> <button class="btn btn-lg btn-success btn-block" type="submit">Search</button> <br> <p align="center">{{error}} </p> </form> 

Answer 1

Jinja2 template engine will render selectfield with choices, you dont have to create a html select field, jinja2 already does. And if you need to check form submission use validate_on_submit() or request.method == 'POST' :

class SelectMenu(Form):
    month = SelectField('Select Month', choices=[(1, 'January'), (2,'February')])

@app.route('/searchemp/', methods=['GET', 'POST'])
def searchemp():
    form = SelectMenu(request.form)
    if form.validate_on_submit():
        # get posted data
        m = form.month.data
    return render_template('index.html', form=form)

# index.html
<form action="" method="POST">
    {{form.month.label}}{{form.month}}
</form>