Flask is a lightweight Web application framework written in Python using. WSGI toolkit that uses Werkzeug, template engine is used Jinja2
A user registration and login page Flask framework to achieve, through the beautification of the page, can be applied directly to the project.
Implementing user registration
1. Create a new file in static flask sytle.css directory.
body {
display: flex;
align-items: center;
justify-content: center;
text-align: -webkit-center;
line-height: 0.5;
background: aliceblue;
}
.form-bg{
background: #00b4ef;
}
.form-horizontal{
background: #fff;
padding-bottom: 10px;
border-radius: 15px;
text-align: center;
}
.form-horizontal .heading{
display: block;
font-size: 35px;
font-weight: 700;
padding: 35px 0;
border-bottom: 1px solid #f0f0f0;
margin-bottom: 30px;
}
.form-horizontal .form-group{
padding: 0 40px;
margin: 0 0 25px 0;
position: relative;
}
.form-horizontal .form-control{
background: #f0f0f0;
border: none;
border-radius: 20px;
box-shadow: none;
padding: 0 20px 0 45px;
height: 40px;
transition: all 0.3s ease 0s;
}
.form-horizontal .form-control:focus{
background: #e0e0e0;
box-shadow: none;
outline: 0 none;
}
.form-horizontal .form-group i{
position: absolute;
top: 12px;
left: 60px;
font-size: 17px;
color: #c8c8c8;
transition : all 0.5s ease 0s;
}
.form-horizontal .form-control:focus + i{
color: #00b4ef;
}
.form-horizontal .fa-question-circle{
display: inline-block;
position: absolute;
top: 12px;
right: 60px;
font-size: 20px;
color: #808080;
transition: all 0.5s ease 0s;
}
.form-horizontal .fa-question-circle:hover{
color: #000;
}
.form-horizontal .text{
float: left;
margin-left: 7px;
line-height: 20px;
padding-top: 5px;
text-transform: capitalize;
}
.form-horizontal .btn{
font-size: 14px;
color: #fff;
border-radius: 100px;
padding: 10px 70px;
border: none;
text-transform: capitalize;
transition: all 0.5s ease 0s;
}
@media only screen and (max-width: 479px){
.form-horizontal .form-group{
padding: 0 25px;
}
.form-horizontal .form-group i{
left: 45px;
}
.form-horizontal .btn{
padding: 10px 20px;
}
}2. Create a register.html in the templates directory
<html>
<head>
<link rel='stylesheet' href='https://stackpath.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css'>
<link href="http://cdn.bootcss.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet">
<link href="/static/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-offset-3 col-md-6">
<form action="/register" method="post" class="form-horizontal">
<span class="heading">用 户 注 册</span>
<div class="form-group">
{{ form.username }}
<i class="fa fa-user"></i>
<a href="/login" class="fa fa-question-circle"></a>
</div>
<div class="form-group">
{{ form.email }}
<i class="fa fa-envelope"></i>
</div>
<div class="form-group">
{{ form.password }}
<i class="fa fa-lock"></i>
</div>
<div class="form-group">
{{ form.RepeatPassword }}
<i class="fa fa-unlock-alt"></i>
</div>
{{ form.submit }}
</form>
</div>
</div>
</div>
</body>
</html>3. Write in app.py inside.
from flask import Flask, render_template, request, redirect
from wtforms import Form,validators,widgets
from wtforms.fields import simple,html5
app = Flask(__name__, template_folder="templates")
class RegisterForm(Form):
username = simple.StringField(
#label='注册用户：',
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(),
render_kw={'class': 'form-control',
"placeholder":"输入注册用户名"}
)
email = simple.StringField(
#label='用户邮箱：',
validators=[validators.DataRequired(message='邮箱不能为空'),validators.Email(message="邮箱格式输入有误")],
render_kw={'class':'form-control',
"placeholder":"输入Email邮箱"}
)
password = simple.PasswordField(
#label='用户密码：',
validators=[
validators.DataRequired(message='密码不能为空'),
validators.Length(min=5, message='用户名长度必须大于%(min)d'),
validators.Regexp(regex="[0-9a-zA-Z]{5,}",message='密码不允许使用特殊字符')
],
widget=widgets.PasswordInput(),
render_kw={'class': 'form-control',
"placeholder":"输入用户密码"}
)
RepeatPassword = simple.PasswordField(
#label='重复密码：',
validators=[
validators.DataRequired(message='密码不能为空'),
validators.Length(min=5, message='密码长度必须大于%(min)d'),
validators.Regexp(regex="[0-9a-zA-Z]{5,}",message='密码不允许使用特殊字符'),
validators.EqualTo("password",message="两次密码输入必须一致,龟孙")
],
widget=widgets.PasswordInput(),
render_kw={'class': 'form-control',
"placeholder":"再次输入密码"}
)
submit = simple.SubmitField(
label="用 户 注 册",
render_kw={ "class":"btn btn-success" }
)
@app.route('/register', methods=['GET', 'POST'])
def Register():
if request.method == 'GET':
RetForm = RegisterForm()
return render_template('register.html', form=RetForm)
else:
RetForm = RegisterForm(formdata=request.form)
if RetForm.validate():
print('接收到数据：', RetForm.data)
return '''<script>alert('您的注册请求已提交!');</script>'''
else:
print(RetForm.errors)
return render_template('register.html', form=RetForm)
if __name__ == '__main__':
app.run()Results are as follows.
Implement user login
login.html
<html>
<head>
<link rel='stylesheet' href='https://stackpath.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css'>
<link href="http://cdn.bootcss.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet">
<link href="/static/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-offset-3 col-md-6">
<form action="/login" method="post" class="form-horizontal">
<span class="heading">用 户 登 录</span>
<div class="form-group">
{{ form.username }}
<i class="fa fa-user"></i>
</div>
<div class="form-group help">
{{ form.password }}
<i class="fa fa-lock"></i>
<a href="#" class="fa fa-question-circle"></a>
</div>
<div class="form-group">
<button type="submit" class="btn btn-success">登 录 后 台</button>
</div>
</form>
</div>
</div>
</div>
</body>
</html>app.py
from flask import Flask, render_template, request, redirect
from wtforms import Form,validators,widgets
from wtforms.fields import simple,html5
app = Flask(__name__, template_folder="templates")
class LoginForm(Form):
username = simple.StringField(
validators=[
validators.DataRequired(message=''),
validators.Length(min=4, max=15, message=''),
validators.Regexp(regex="[0-9a-zA-Z]{4,15}", message='')
],
widget=widgets.TextInput(),
render_kw={"class":"form-control",
"placeholder":"请输入用户名或电子邮件"}
)
password = simple.PasswordField(
validators=[
validators.DataRequired(message=''),
validators.Length(min=5, max=15,message=''),
validators.Regexp(regex="[0-9a-zA-Z]{5,15}",message='')
],
widget=widgets.PasswordInput(),
render_kw={"class":"form-control",
"placeholder":"请输入密码"}
)
@app.route("/login",methods=['GET','POST'])
def Login():
if request.method == 'GET':
RetForm = LoginForm()
return render_template('login.html', form=RetForm)
else:
RetForm = LoginForm(formdata=request.form)
if RetForm.validate():
temp = RetForm.data
print("接收到数据:",temp)
return '''<script type="text/javascript">alert('登录完成!');</script>'''
return render_template('login.html', form=RetForm)
if __name__ == '__main__':
app.run()