目录
wtforms
使用1(简单版)：
使用2(复杂版)：
wtforms
安装:pip3 install wtforms
使用1(简单版)：
from flask import Flask, render_template, request, redirect
from wtforms import Form
from wtforms.fields import simple
from wtforms import validators
from wtforms import widgets
app = Flask(__name__, template_folder=\'templates\')
app.debug = True
class LoginForm(Form):
# 字段（内部包含正则表达式）
name = simple.StringField(
label=\'用户名\',
validators=[
validators.DataRequired(message=\'用户名不能为空.\'),
validators.Length(min=6, max=18, message=\'用户名长度必须大于%(min)d且小于%(max)d\')
],
widget=widgets.TextInput(), # 页面上显示的插件
render_kw={\'class\': \'form-control\'}
)
# 字段（内部包含正则表达式）
pwd = simple.PasswordField(
label=\'密码\',
validators=[
validators.DataRequired(message=\'密码不能为空.\'),
validators.Length(min=8, message=\'用户名长度必须大于%(min)d\'),
validators.Regexp(regex=\"^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[$@$!%*?&])[A-Za-z\\d$@$!%*?&]{8,}\",
message=\'密码至少8个字符，至少1个大写字母，1个小写字母，1个数字和1个特殊字符\')
],
widget=widgets.PasswordInput(),
render_kw={\'class\': \'form-control\'}
)
@app.route(\'/login\', methods=[\'GET\', \'POST\'])
def login():
if request.method == \'GET\':
form = LoginForm()
return render_template(\'login.html\', form=form)
else:
form = LoginForm(formdata=request.form)
if form.validate():
print(\'用户提交数据通过格式验证，提交的值为：\', form.data)
else:
print(form.errors)
return render_template(\'login.html\', form=form)
if __name__ == \'__main__\':
app.run()
login.html
<!DOCTYPE html>
<html lang=\"en\">
<head>
<meta charset=\"UTF-8\">
<title>Title</title>
</head>
<body>
<h1>登录</h1>
<form method=\"post\">
<p>{{form.name.label}} {{form.name}} {{form.name.errors[0] }}</p>
<p>{{form.pwd.label}} {{form.pwd}} {{form.pwd.errors[0] }}</p>
<input type=\"submit\" value=\"提交\">
</form>
</body>
</html>
使用2(复杂版)：
from flask import Flask, render_template, request, redirect
from wtforms import Form
from wtforms.fields import core
from wtforms.fields import html5
from wtforms.fields import simple
from wtforms import validators
from wtforms import widgets
app = Flask(__name__, template_folder=\'templates\')
app.debug = True
class RegisterForm(Form):
name = simple.StringField(
label=\'用户名\',
validators=[
validators.DataRequired()
],
widget=widgets.TextInput(),
render_kw={\'class\': \'form-control\'},
default=\'alex\'
)
pwd = simple.PasswordField(
label=\'密码\',
validators=[
validators.DataRequired(message=\'密码不能为空.\')
],
widget=widgets.PasswordInput(),
render_kw={\'class\': \'form-control\'}
)
pwd_confirm = simple.PasswordField(
label=\'重复密码\',
validators=[
validators.DataRequired(message=\'重复密码不能为空.\'),
validators.EqualTo(\'pwd\', message=\"两次密码输入不一致\") # EqualTo也可以做密码验证
],
widget=widgets.PasswordInput(),
render_kw={\'class\': \'form-control\'}
)
email = html5.EmailField(
label=\'邮箱\',
validators=[
validators.DataRequired(message=\'邮箱不能为空.\'),
validators.Email(message=\'邮箱格式错误\')
],
widget=widgets.TextInput(input_type=\'email\'),
render_kw={\'class\': \'form-control\'}
)
gender = core.RadioField(
label=\'性别\',
choices=(
(1, \'男\'),
(2, \'女\'),
),
coerce=int # “1” “2”
)
city = core.SelectField(
label=\'城市\',
choices=(
(\'bj\', \'北京\'),
(\'sh\', \'上海\'),
)
)
hobby = core.SelectMultipleField(
label=\'爱好\',
choices=(
(1, \'篮球\'),
(2, \'足球\'),
),
coerce=int
)
favor = core.SelectMultipleField(
label=\'喜好\',
choices=(
(1, \'篮球\'),
(2, \'足球\'),
),
widget=widgets.ListWidget(prefix_label=False),
option_widget=widgets.CheckboxInput(),
coerce=int,
default=[1, 2]
)
def __init__(self, *args, **kwargs):
super(RegisterForm, self).__init__(*args, **kwargs)
self.favor.choices = ((1, \'篮球\'), (2, \'足球\'), (3, \'羽毛球\'))
def validate_pwd_confirm(self, field):
\"\"\"
自定义pwd_confirm字段规则，例：与pwd字段是否一致
:param field:
:return:
\"\"\"
# 最开始初始化时，self.data中已经有所有的值
if field.data != self.data[\'pwd\']:
# raise validators.ValidationError(\"密码不一致\") # 继续后续验证
raise validators.StopValidation(\"密码不一致\") # 不再继续后续验证
@app.route(\'/register\', methods=[\'GET\', \'POST\'])
def register():
if request.method == \'GET\':
form = RegisterForm(data={\'gender\': 2,\'hobby\':[1,]}) # initial
return render_template(\'register.html\', form=form)
else:
form = RegisterForm(formdata=request.form)
if form.validate():
print(\'用户提交数据通过格式验证，提交的值为：\', form.data)
else:
print(form.errors)
return render_template(\'register.html\', form=form)
if __name__ == \'__main__\':
app.run()
register.html
<!DOCTYPE html>
<html lang=\"en\">
<head>
<meta charset=\"UTF-8\">
<title>Title</title>
</head>
<body>
<h1>用户注册</h1>
<form method=\"post\" novalidate style=\"padding:0 50px\">
{% for field in form %}
<p>{{field.label}}: {{field}} {{field.errors[0] }}</p>
{% endfor %}
<input type=\"submit\" value=\"提交\">
</form>
</body>
</html>
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