app = Flask(__name__)
app.config['SECRET_KEY']='hard to guess string'

#!/usr/bin/env python
#简单的web表单，包含一个文本字段和一个提交按钮
 
from flask_wtf import Form
from wtforms import StringField,SubmitField
from wtforms.validators import Required
 
class NameForm(Form):
  name = StringField('What is your name?',validators=[Required()])
  submit = SubmitField('Submit')

<form method="POST">
  {{ form.hidden_tag() }}
  {{ form.name.label }} {{ form.name() }}
  {{ form.submit() }}
</form>

<form method="POST">
  {{ form.hidden_tag() }}
  {{ form.name.label }} {{ form.name(id='my-text-field') }}
  {{ form.submit() }}
</form>

{% import "boostrap/wtf.html" as wtf %}
{{ wtf.quick_form(form) }}

#使用Flask-WTF和Flask-Bootstrap渲染表单
 
{% extends "base.html" %}
{% import "bootstrap/wtf.html" as wtf %}
 
{% block title %}Flasky{% endblock %}
 
{% block page_content %}
<div class="page-header">
  <h1>Hello,{% if name %}{{ name }}{% else %}Stranger{% endif %}</h1>
</div>
{{ wtf.quick_form(form) }}
{% endblock %}

@app.route('/',methods=['GET','POST'])
def index():
  name = None
  form = NameForm()
  if form.validate_on_submit():
    name = form.name.data
    form.name.data = ''
  return render_template('index.html',form=form,name=name)

#!/usr/bin/env python
 
from flask import Flask,render_template,session,redirect,url_for
app = Flask(__name__)
 
@app.route('/',methods=['GET','POST'])
def index():
  form = NameForm()
  if form.validate_on_submit():
    session['name'] = form.name.data
    return redirect(url_for('index'))
  return render_template('index.html',form=form,name=session.get('name'))

from flask import Flask,render_template,session,redirect,url_for,flash
app = Flask(__name__)
 
@app.route('/',methods=['GET','POST'])
def index():
  form = NameForm()
  if form.validata_on_submit():
    old_name = session.get('name')
    if old_name is not None and old_name != form.name.data:
      flash('Looks like you have changed your name!')
    session['name'] = form.name.data
    return redirect(url_for('index'))
  return render_template('index.html',form=form,name=session.get('name'))

#渲染Flash消息
 
{% block content %}
<div class="container">
  {% for message in get_flashed_messages() %}
  <div class="alert alert-warning">
    <button type="button" class="close" data-dismiss="alert">×</button>
    {{ message }}
  </div>
  {% endfor %}
  {% block page_content %}{% endblock %}
</div>
{% endblock %}