3、Flask-Bootstrap的基本使用

1、使用Flask-Bootstrap集成Twitter Bootstrap

目录结构

安装flask-bootstrap

Flask-Bootstrap从falsk_bootstrap命名空间中导入，然后把程序实例传入构造方法中进行初始化

Jinja2中的extends指令从Flask-Bootstrap中导入bootstrap/base.html；从而实现模板继承。Flask-bootstrap中的基摸板提供了一个网页框架，引入了Bootstrap中所有的css和JavaScript文件

基模板中定义了可在衍生模板中重定义的块。block和endblock指令定义的块中内容可添加到基模板中

2、重写基页并添加自定义错误页

改写后的目录结构

添加基页base.html

{% extends "bootstrap/base.html" %}

{% block title %}Flasky{% endblock %}

{% block navbar %}
<div class="navbar navbar-inverse" role="navigation">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="/">Flask</a>
        </div>
        <div class="navbar-collapse collapse">
            <ul class="nav navbar-nav">
                <li><a href="/">Home</a></li>
            </ul>
        </div>
    </div>
</div>
{% endblock %}

{% block content %}
<div class="container">
    <div class="page-header">
    {% block page_content %}{% endblock %}
    </div>
</div>
{% endblock %}

基于base.html改写user.html

{% extends "base.html" %}

{% block title %}Flasky{% endblock %}

{ % block page_content %}
<div class="page-header">
    <h1>Hello, {{ name }}!</h1>
</div>
{% endblock %}

基于base.html添加自定义错误页
404.html

{% extends "base.html" %}

{% block tittle %}Flasky - Page Not Found{% endblock %}

{% block page_content %}
<div class="page-header">
<h1>Not Found</h1>
</div>
{% endblock %}

500.html

{% extends "base.html" %}

{% block tittle %}Flasky - Internal Server Error{% endblock %}

{% block page_content %}
<div class="page-header">
<h1>Internal Server Error</h1>
</div>
{% endblock %}

在hello.py中加入404,500的视图函数

from flask import Flask,request,make_response,redirect,render_template
from flask_bootstrap import Bootstrap

app = Flask(__name__)
bootstrap = Bootstrap(app)

@app.route('/')
def index():
return render_template('index.html')

@app.errorhandler(404)
def page_not_found(e):
return render_template('404.html'), 404

@app.errorhandler(500)
def internal_server_error(e):
return render_template('500.html'), 500


@app.route('/user/<name>')
def user(name):
return render_template('user.html', name=name)


@app.route('/user/<id>')
def get_user(id):
user = load_user(id)
if not user:
abort(404)
return '<h1>Hello, %s</h1>' % user.name


if __name__ == '__main__':
bootstrap.run()

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