Flask扩展( Flask-Bootstrap)


  • Flask-Bootstrap
    • 安装
    • 使用

Flask-Bootstrap Bootstrap 是 Twitter 开发的一个开源框架,它提供的用户界面组件可用于创建整洁且具有吸引力的网页,而且这些网页还能兼容所有现代 Web 浏览器。
Bootstrap 是客户端框架,因此不会直接涉及服务器。服务器需要做的只是提供引用了 Bootstrap 层叠样式表(CSS)和 JavaScript 文件的 HTML 响应, 并且 HTML、CSS 和 JavaScript 代码中实例化所需组件。这些操作最理想的执行场所就是模版。
Flask-Bootstrap 可以在程序中集成 Bootstrap
安装
pip install flask-bootstrap

使用 Flask 扩展一般都在创建程序实例时初始化。
from flask_bootstrap import Bootstrap#...bootstrap = Bootstrap(app)

初始化 Flask-Bootstrap 之后,就可以在程序中使用一个包含所有Bootstrap 文件的基模版。这个模版利用 Jinja2 的模版继承机制,让程序扩展一个具有基本页面结构的基模版,其中就有用来引入 Bootstrap 的元素。
{% extends "bootstrap/base.html" %}{% block title %}Flasky{% endblock %}{% block navbar %} {% endblock %}{% block content %}
{% endblock %}

Jinja2 中的 extends 指令从 Flask-Bootstrap 中导入 bootstrap/base.html,从而实现模版继承。Flask-Bootstrap 中的基模版提供了一个网页框架,引入了 Bootstrap 中的所有 CSS 和 JavaScript 文件。
基模版中定义了可在衍生模版中重定义的块。blockendblock 指令定义的块中的内容可添加到基模版中。
上面这个示例定义了3个块,分别名为 titlenavbarcontent。这些块都是基模版提供的,可在衍生模版中重新定义。
Flask-Bootstrapbase.html 模块定义的可用块。
块名 说明
doc 整个HTML文档
html_attribs 标签的属性
html 标签的内容
head 标签的内容
title 标签的内容</td> </tr> <tr> <td>metas</td> <td>一组 <meta> 标签</td> </tr> <tr> <td>styles</td> <td>层叠样式表定义</td> </tr> <tr> <td>body_attribs</td> <td><body> 标签的属性</td> </tr> <tr> <td>body</td> <td><body> 标签的内容</td> </tr> <tr> <td>navbar</td> <td>用户自定义的导航条</td> </tr> <tr> <td>content</td> <td>用户定义的页面内容</td> </tr> <tr> <td>scripts</td> <td>文档底部的 JavaScript 声明</td> </tr> </tbody> </table> <strong>【Flask扩展( Flask-Bootstrap)】</strong>注意:上表中很多块都是 <code>Flask-Bootstap</code> 自用的, 如果直接重定义可能会导致一些问题。如果程序需要向已经有内容的块中添加新内容, 必须使用 <code>Jinja2</code> 提供的 <code>super()</code> 函数。例如,如果要在衍生模版中添加新的 <code>JavaScript</code> 文件,需要这么定义:<br /> <blockquote><code>{% block scripts %} {{ super() }} <script type="text/javascript" src="https://www.it610.com/article/my-script.js"></script> {% endblock %}</code></blockquote><br /> </p> <div class="dede_pages"><ul></ul></div> <div class="pcd_ad"> <center><div class="_ahwullr0ac"></div> <script type="text/javascript"> (window.slotbydup = window.slotbydup || []).push({ id: 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