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Example tutorial on beautifying the bootstrap framework (python)

PHPz

Apr 26, 2017 am 10:19 AM

bootstrap

After the content of the previous chapter, in fact, as far as the page layer is concerned, the function can be easily implemented, but it is obvious that there is still a big lack of aesthetics. Now there are some good front-end css frameworks, such as AmazeUI , Tencent's WeUI, etc. Here is a bootstrap framework that is well integrated with flask

[Related video recommendation: Bootstrap tutorial]

Installation framework

In addition to directly referencing bootstrap’s CDN or local path in the template, you can also directly apply flask’s bootstrap integration package. First, you need to install the integration package:

pip3.6 install flask-bootstrap

This is a flask expansion package. The default package names of all flask expansion packages begin with flask.ext. , the same is true for bootstrap. First, import the package at the head of the default file:

from flask.ext.bootstrap import Bootstrap

and then perform bootstrap Initialization, modify the code:

bootstrap=Bootstrap(app)

After initialization, you can use the inheritance method of Jinja2 to use one of the components contained in this package. A series of base templates for Bootstrap. The base template directly references a series of elements in bootstrap.

Remember how to use template inheritance in jinja2. Before using it, first take a look at the structure of the base template:

{% block doc -%}
<!DOCTYPE html>
<html{% block html_attribs %}{% endblock html_attribs %}>
{%- block html %}
 <head>
 {%- block head %}
 <title>{% block title %}{{title|default}}{% endblock title %}</title>

 {%- block metas %}
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 {%- endblock metas %}

 {%- block styles %}
 <!-- Bootstrap -->
 <link href="{{bootstrap_find_resource(&#39;css/bootstrap.css&#39;, cdn=&#39;bootstrap&#39;)}}" rel="external nofollow" rel="stylesheet">
 {%- endblock styles %}
 {%- endblock head %}
 </head>
 <body{% block body_attribs %}{% endblock body_attribs %}>
 {% block body -%}
 {% block navbar %}
 {%- endblock navbar %}
 {% block content -%}
 {%- endblock content %}

 {% block scripts %}
 <script src="{{bootstrap_find_resource(&#39;jquery.js&#39;, cdn=&#39;jquery&#39;)}}"></script>
 <script src="{{bootstrap_find_resource(&#39;js/bootstrap.js&#39;, cdn=&#39;bootstrap&#39;)}}"></script>
 {%- endblock scripts %}
 {%- endblock body %}
 </body>
{%- endblock html %}
</html>
{% endblock doc -%}

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As can be seen from the source code, this base template defines 12 Each block corresponds to the entire document (doc), html attributes (html_attribs), the entire html (html), the entire head part (head), the title part (title), the meta code part (metas), and the css style (styles). body attributes (body_attribs), body part (body), navigation (navbar),
page content (content), js (scripts)

and title, meta, css, and js all have default content , so you need to add {{super()}}

when using it. According to the structure of this base template, modify the code in login.html to:

{% extends "bootstrap/base.html"%}
{% block title%}牛博客 {% endblock %}<!--覆盖title标签-->
{% block navbar %}
<nav class="navbar navbar-inverse"><!-- 导航部分 -->
 导航
</nav>
{% endblock %}
{% block content %} <!--具体内容-->
<p class="container">
 <p class="container">
 <form method="post">
 <p class="form-group">
 <label for="username">用户名</label>
 <input type="text" class="form-control" id="username" placeholder="请输入用户名">
 </p>
 <p class="form-group">
 <label for="passworld">密码</label>
 <input type="password" class="form-control" id="passworld" placeholder="请输入密码">
 </p>
 <button type="submit" class="btn btn-default">登录</button>
 </form>
 </p>
</p>
{% endblock %}

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Run the program, now The displayed result is:

Much more beautiful than just now, the generated html code is:

<!DOCTYPE html>
<html>
 <head>
 <title>牛博客 </title>
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <!-- Bootstrap -->
 <link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="stylesheet">
 </head>
 <body>
 <nav class="navbar navbar-inverse"><!-- 导航部分 -->
 导航
 </nav>
 <!--具体内容-->
 <p class="container">
 <form method="post">
 <p class="form-group">
 <label for="username">用户名</label>
 <input type="text" class="form-control" id="username" placeholder="请输入用户名">
 </p>
 <p class="form-group">
 <label for="passworld">密码</label>
 <input type="password" class="form-control" id="passworld" placeholder="请输入密码">
 </p>
 <button type="submit" class="btn btn-default">登录</button>
 </form>
 </p>
 <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
 <script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
 </body>
</html>

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Pay attention to the addresses of these CDNs, this address Sometimes you are blocked by a wall, what should you do?

The modification method is to find the Lib\site-packages\flask_bootstrap folder in the python installation directory. There is an __init__.py file under the folder. After opening it, you will see the following code:

Make modifications. By the way, I often use the bootcdn cdn server.

Let’s use the local method to test. After entering test and 123, the result is:

The previous test login success page is still displayed, which is obviously wrong. Generally speaking, bbs or blogs jump to the page before login or the homepage. Now For convenience, all jumps to the home page. At the same time, if the user name or password is incorrect, a prompt will be displayed on the login page. Modify the default.py code as follows:

from flask import session #导入session对象

@app.route("/login",methods=["POST"])
def loginPost():
 username=request.form.get("username","")
 password=request.form.get("password","")
 if username=="test" and password=="123" :
 session["user"]=username
 return render_template("/index.html",name=username,site_name=&#39;myblog&#39;)
 else:
 return "登录失败"

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The source code after successful login is:

<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>myblog</title>
</head>
<body>
<h1>这个站点的名字为 myblog </h1>
</body>
</html>

Copy after login

Oh, by the way, the bootstrap base template is not referenced. Modify the template code of index.html and change the

{% extends "base.html" %}# in the first line.

##Modify to

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

Refresh to:

<!DOCTYPE html>
<html>
 <head>
 <title>blog</title>
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <!-- Bootstrap -->
 <link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
 </head>
 <body>
 <h1>这个站点的名字为 myblog </h1>
 </body>
</html>

Copy after login

See that the bootstrap framework has been successfully referenced, but all the navigation parts are missing. Of course, you cannot write the navigation again at this time. You can directly modify the custom base template, and then let other templates reference it. Modify the base template. It is:

{%extends "bootstrap/base.html "%}
{% block title%}牛博客 {% endblock %}<!--覆盖title标签-->

{% block navbar %}
<nav class="navbar navbar-inverse"><!-- 导航部分 -->
 导航
</nav>
{% endblock %}
{% block content %} <!--具体内容-->
<p class="container">
</p>
{% endblock %}

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Then modify the homepage code:

{% extends "base.html" %}

{% block content %}
 <h1>这个站点的名字为 {{site_name}} </h1>
{% endblock %}

Copy after login

Modify the login page code to:

{% extends "base.html"%}
{% block content %} <!--具体内容-->
<p class="container">
 <form method="post">
 <p class="form-group">
 <label for="username">用户名</label>
 <input type="text" class="form-control" name="username" id="username" placeholder="请输入用户名">
 </p>
 <p class="form-group">
 <label for="passworld">密码</label>
 <input type="password" class="form-control" name="password" id="passworld" placeholder="请输入密码">
 </p>
 <button type="submit" class="btn btn-default">登录</button>
 </form>
</p>
{% endblock %}

Copy after login

The display result of the successful login page below is:

The page style remains consistent with the login page. However, currently, if the username and password are incorrect (that is, the input is not test and 123), in addition to returning a login error string as before, , the user cannot know, so a method is needed to reflect the user's status. In this regard, flask provides the flash function. Let's continue to modify the default.py file:

from flask import flash

@app.route("/login",methods=["POST"])
def loginPost():
 username=request.form.get("username","")
 password=request.form.get("password","")
 if username=="test" and password=="123" :
 session["user"]=username
 return render_template("/index.html",name=username,site_name=&#39;myblog&#39;)
 else:
 flash("您输入的用户名或密码错误")
 return render_template("/login.html") #返回的仍为登录页

Copy after login

Modify the login.html template:

{% extends "base.html"%}
{% block content %} <!--具体内容-->
<p class="container">
 {% for message in get_flashed_messages() %}
 <p class="alert alert-warning">
 <button type="button" class="close" data-dismiss="alter">&times</button>
 {{message}}
 </p>
 {% endfor %}
 <form method="post">
 <p class="form-group">
 <label for="username">用户名</label>
 <input type="text" class="form-control" name="username" id="username" placeholder="请输入用户名">
 </p>
 <p class="form-group">
 <label for="passworld">密码</label>
 <input type="password" class="form-control" name="password" id="passworld" placeholder="请输入密码">
 </p>
 <button type="submit" class="btn btn-default">登录</button>
 </form>
</p>
{% endblock %}

Copy after login

Okay, enter test and 1234 below, and the displayed result is:

The status is displayed perfectly.

Continue to beautify

The login page and the basic functions of the controller have been completed, but for this page only, there is no login box that takes up the entire screen. Generally speaking, it is the centering part. This part does not involve flask. It is the turn of bootstrap's grid system to appear.

栅格系统简单说就是将一个container或container-fluid中分为12个列，每个列都可以合并或偏移，与html中的table类似，并且支持响应式，通过xs，sm，md，lg来进行不同屏幕尺寸的区分。下面用栅格系统对登录页进行一下修改：

{% extends "base.html"%}
{% block content %} <!--具体内容-->
<p class="container">
 <p class="row"></p>
 <p class="row">
 <#-- col-md-4表示合并4列，col-md-offset-4表示偏移4列 sm意思相同 --#>
 <p class="col-md-4 col-md-offset-4 col-sm-6 col-sm-offset-3">
 <p class="page-header">
 <h1>欢迎您登陆</h1>
 </p>
 {% for message in get_flashed_messages() %}
 <p class="alert alert-warning">
 <button type="button" class="close" data-dismiss="alter">&times</button>
 {{message}}
 </p>
 {% endfor %}

 <form method="post">
 <p class="form-group">
 <label for="username">用户名</label>
 <input type="text" class="form-control" name="username" id="username" placeholder="请输入用户名">
 </p>
 <p class="form-group">
 <label for="passworld">密码</label>
 <input type="password" class="form-control" name="password" id="passworld" placeholder="请输入密码">
 </p>
 <button type="submit" class="btn btn-default">登录</button>
 </form>
 </p>
 </p>
</p>
{% endblock %}

Copy after login

显示结果如下：

毕竟不是专业美工，没有经过设计，但至少比刚刚美观多了，但登录的用户名和密码写成固定值肯定是不行的，数据库是必不可少的，将在下一章让flask和mysql进行互联。

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