flask 模版if 语句和for语句
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if语句
格式：
{% if command %}
{% elif %}
{% else %}
{% endif %}
代码示例
flask_one.py
#encoding:utf-8
from flask import Flask,url_for,redirect,render_template
app = Flask(__name__)
@app.route(\'/<is_login>\')
def index(is_login):
if is_login == "1": #模拟1为登陆成功
user = {
"aa":"test",
\'bbb\':\'注销\',
\'age\':"11"
}
return render_template(\'index.html\',users=user)
else:
return render_template(\'index.html\')
if __name__ == \'__main__\':
app.run(debug=True)
index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> {% if users and users.age >10 %} #这里的users为py文件里传递的user字典，users.age为py文件user字典里的age <a href="#">{{ users.aa }}</a> <a href="#">{{ users.bbb}}</a> {% else %} <a href="#">登陆</a> <a href="#">注册</a> {% endif %} </body> </html>
url入口：127.0.0.1/{1,0..}
for语句
格式：
{% for .. %}
{% endfor %}
代码实现：
flask_one.py
#encoding:utf-8
from flask import Flask,url_for,redirect,render_template
app = Flask(__name__)
@app.route(\'/\')
def index():
users = {
\'username\':\'tsdf\',
\'age\':11
}
return render_template(\'index.html\',user=users)
if __name__ == \'__main__\':
app.run(debug=True)
index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> {% for k,v in user.items() %} #for语句 <p>{{ k }}----{{ v }}</p> {% endfor %} </body> </html>
redirect 传数据到模板语言（flash）
from flask import redirect,flash @app.route(\'/register\',methods=[\'GET\',\'POST\']) def register(): if request.method == \'GET\': return render_template(\'register.html\') else: phone = request.form.get(\'phone\') uname = request.form.get(\'username\') pwd = request.form.get(\'password\') pwd1 = request.form.get(\'password1\') user = User.query.filter(User.phone == phone).first() if user is not None: return "用户已经存在" else: if phone == "" or uname == "": flash(\'手机号或者用户名不能为空\') return redirect(url_for(\'register\')) elif pwd != pwd1: flash(\'两次输入的密码不匹配\') return redirect(url_for(\'register\')) else: user = User(phone=phone,username=uname,password=pwd) db.session.add(user) db.session.commit() # user = User.query.filter(User.phone == phone).first() # print (user) return redirect(url_for(\'login\'))
模板语言：
{% extends \'common.html\' %} {% block title %} 注册 {% endblock %} {% block head %} <link rel="stylesheet" href="{{ url_for(\'static\',filename=\'css/login_regist.css\') }}"> {% endblock %} {% block body %} <div class="form-container"> <h4 style="text-align: center">注册</h4> <form action="" method="POST"> <div class="form-group"> <span><input type="text" class="form-control" id="exampleInputEmail1" placeholder="手机号" name="phone"></span> </div> <div class="form-group"> <span><input type="text" class="form-control" id="exampleInputEmail1" placeholder="用户名" name="username"></span> </div> <div class="form-group"> <span><input type="password" class="form-control" id="exampleInputPassword1" placeholder="密码" name="password"></span> </div> <div class="form-group"> <span><input type="password" class="form-control" id="exampleInputPassword1" placeholder="重复密码" name="password1"></span> </div> <button type="submit" class="btn btn-block" onclick="tj()">立即注册</button> </form> <p> {% for message in get_flashed_messages() %} {{ message }} {% endfor %} </p> </div> {% endblock %}
代码示例：
flask_one.py
#encoding:utf-8 from flask import Flask,url_for,redirect,render_template app = Flask(__name__) @app.route(\'/\') def index(): books = [ {\'name\':\'西游记\',\'author\':\'吴承恩\',\'price\':111}, {\'name\': \'红楼梦\', \'author\': \'曹雪芹\', \'price\': 121}, {\'name\': \'水浒传\', \'author\': \'施耐庵\', \'price\': 131}, {\'name\': \'三国演义\', \'author\': \'罗贯中\', \'price\': 141} ] return render_template(\'index.html\',book=books) if __name__ == \'__main__\': app.run(debug=True)
index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <table border="1"> <thead> <th>书名</th> <th>作者</th> <th>价格</th> </thead> <tbody> {% for book in book %} #for循环列表并打印字典里的内容 <tr> <td>{{ book.name }}</td> <td>{{ book.author }}</td> <td>{{ book.price }}</td> </tr> {% endfor %} </tbody> </table> </body> </html>
自定义错误信息
@app.errorhandler(404) def page_noe_found(error): return render_template(\'home/404.html\'),404 @app.errorhandler(500) def page_noe_found(error): return render_template(\'home/500.html\'),500
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