展示书籍列表：

首先修改原先的 book_list.html 的代码：

<!DOCTYPE html>

<!-- saved from url=(0042)https://v3.bootcss.com/examples/dashboard/ -->

<html lang="zh-CN">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    <meta http-equiv="X-UA-Compatible" content="IE=edge">

    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->

    <meta name="description" content="">

    <meta name="author" content="">

    <link rel="icon" href="https://v3.bootcss.com/favicon.ico">

    <title>书籍列表管理</title>

    <!-- Bootstrap core CSS -->

    <link href="/static/bootstrap/css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom styles for this template -->

    <link href="/static/dashboard.css" rel="stylesheet">

    <link rel="stylesheet" href="/static/fontawesome/css/font-awesome.min.css">

</head>

<body>

<nav class="navbar navbar-inverse navbar-fixed-top">

    <div class="container-fluid">

        <div class="navbar-header">

            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar"

                    aria-expanded="false" aria-controls="navbar">

                <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="https://v3.bootcss.com/examples/dashboard/#">图书管理系统</a>

        </div>

        <div id="navbar" class="navbar-collapse collapse">

            <ul class="nav navbar-nav navbar-right">

                <li><a href="https://v3.bootcss.com/examples/dashboard/#">Dashboard</a></li>

                <li><a href="https://v3.bootcss.com/examples/dashboard/#">Settings</a></li>

                <li><a href="https://v3.bootcss.com/examples/dashboard/#">Profile</a></li>

                <li><a href="https://v3.bootcss.com/examples/dashboard/#">Help</a></li>

            </ul>

            <form class="navbar-form navbar-right">

                <input type="text" class="form-control" placeholder="Search...">

            </form>

        </div>

    </div>

</nav>

<div class="container-fluid">

    <div class="row">

        <div class="col-sm-3 col-md-2 sidebar">

            <!-- active 表示当前页面，会加亮 -->

            <ul class="nav nav-sidebar">

                <li><a href="/publisher_list/">出版社列表页</a></li>

                <li class="active"><a href="/book_list/">书籍列表</a></li>

                <li><a href="/author_list/">作者列表</a></li>

            </ul>

        </div>

        <div class="col-sm-9 col-sm-offset-3 col-md-10 col-md-offset-2 main">

            <h1 class="page-header">书籍管理页面</h1>

            <div class="panel panel-primary">

                <!-- Default panel contents -->

                <div class="panel-heading">书籍列表 <i class="fa fa-thumb-tack pull-right"></i></div>

                <div class="panel-body">

                    <div class="row" style="margin-bottom: 15px">

                        <div class="col-md-4">

                            <div class="input-group">

                                <input type="text" class="form-control" placeholder="Search for...">

                                <span class="input-group-btn">

                                    <button class="btn btn-default" type="button">搜索</button>

                                </span>

                            </div><!-- /input-group -->

                        </div><!-- /.col-md-4 -->

                        <!-- 跳转到另一页面，添加新的书籍 -->

                        <div class="col-md-1 pull-right">

                            <a href="/add_book/" class="btn btn-success">新增</a>

                        </div>

                    </div><!-- /.row -->

                    <table class="table table-bordered">

                        <thead>

                        <tr>

                            <th>#</th>

                            <th>id</th>

                            <th>书名</th>

                            <th>出版社名称</th>

                            <th>操作</th>

                        </tr>

                        </thead>

                        <!-- 从原先的 book_list.html 拷贝过来的代码-->

                        <tbody>

                        {% for book in book_list %}

                            <tr>

                                <td>{{ forloop.counter }}</td>

                                <td>{{ book.id }}</td>

                                <td>{{ book.title }}</td>

                                <td>{{ book.publisher.name }}</td>

                                <td>

                                    <a class="btn btn-danger" href="/del_book/?id={{ book.id }}">删除</a>

                                    <a class="btn btn-info" href="/edit_book/?id={{ book.id }}">编辑</a>

                                </td>

                            </tr>

                        {% endfor %}

                        </tbody>

                    </table>

                    <nav aria-label="Page navigation" class="text-right">

                        <ul class="pagination">

                            <li>

                                <a href="#" aria-label="Previous">

                                    <span aria-hidden="true">«</span>

                                </a>

                            </li>

                            <li><a href="#">1</a></li>

                            <li><a href="#">2</a></li>

                            <li><a href="#">3</a></li>

                            <li><a href="#">4</a></li>

                            <li><a href="#">5</a></li>

                            <li>

                                <a href="#" aria-label="Next">

                                    <span aria-hidden="true">»</span>

                                </a>

                            </li>

                        </ul>

                    </nav>

                </div>

            </div>

        </div>

    </div>

</div>

<div class="modal fade" tabindex="-1" role="dialog" id="myModal">

    <div class="modal-dialog" role="document">

        <div class="modal-content">

            <div class="modal-header">

                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span>

                </button>

                <h4 class="modal-title">用户信息</h4>

            </div>

            <div class="modal-body">

                <form class="form-horizontal">

                    <div class="form-group">

                        <label for="inputEmail3" class="col-sm-2 control-label">邮箱</label>

                        <div class="col-sm-10">

                            <input type="email" class="form-control" id="inputEmail3" placeholder="Email">

                        </div>

                    </div>

                    <div class="form-group">

                        <label for="inputPassword3" class="col-sm-2 control-label">密码</label>

                        <div class="col-sm-10">

                            <input type="password" class="form-control" id="inputPassword3" placeholder="Password">

                        </div>

                    </div>

                </form>

            </div>

            <div class="modal-footer">

                <button type="button" class="btn btn-default" data-dismiss="modal">取消</button>

                <button type="button" class="btn btn-primary">保存</button>

            </div>

        </div><!-- /.modal-content -->

    </div><!-- /.modal-dialog -->

</div><!-- /.modal -->

<!-- Bootstrap core JavaScript

================================================== -->

<!-- Placed at the end of the document so the pages load faster -->

<script src="/static/jquery-3.3.1.js"></script>

<script src="/static/bootstrap/js/bootstrap.min.js"></script>

</body>

</html>

修改过程：

运行效果：

添加书籍：

再来修改 add_book.html

<!DOCTYPE html>

<!-- saved from url=(0042)https://v3.bootcss.com/examples/dashboard/ -->

<html lang="zh-CN">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    <meta http-equiv="X-UA-Compatible" content="IE=edge">

    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->

    <meta name="description" content="">

    <meta name="author" content="">

    <link rel="icon" href="https://v3.bootcss.com/favicon.ico">

    <title>添加书籍</title>

    <!-- Bootstrap core CSS -->

    <link href="/static/bootstrap/css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom styles for this template -->

    <link href="/static/dashboard.css" rel="stylesheet">

    <link rel="stylesheet" href="/static/fontawesome/css/font-awesome.min.css">

</head>

<!-- 以上 head 部分从 book_list.html 赋值过来并加以修改 -->

<!-- 以下 body 部分可从 Bootstrap 网站上找相关代码 -->

<body>

<div class="container">

    <div class="row">

        <div class="col-md-6 col-md-offset-3">

            <div class="panel panel-primary">

                <div class="panel-heading">添加书籍</div>

                <div class="panel-body">

                    <form class="form-horizontal" action="/add_book/" method="post">

                        <div class="form-group">

                            <label for="book_title" class="col-sm-2 control-label">书名</label>

                            <div class="col-sm-10">

                                <input type="text" class="form-control" id="book_title" name="book_title"

                                       placeholder="书名">

                            </div>

                        </div>

                        <div class="form-group">

                            <label for="inputPassword3" class="col-sm-2 control-label">出版社</label>

                            <div class="col-sm-10">

                                <select class="form-control" name="publisher">

                                    {% for publisher in publisher_list %}

                                        <option value="{{ publisher.id }}">{{ publisher.name }}</option>

                                    {% endfor %}

                                </select>

                            </div>

                        </div>

                        <div class="form-group">

                            <div class="col-sm-offset-2 col-sm-10">

                                <button type="submit" class="btn btn-success">提交</button>

                            </div>

                        </div>

                    </form>

                </div>

            </div>

        </div>

    </div>

</div>

</body>

</html>

修改过程：

先写一个 container

找一个面板，在 Bootstrap 的组件中可找到

复制代码，并进行修改

现在需要一个 form 表单，在 Bootstrap 的全局 CSS 样式中找

复制下面的代码，替换面板代码中的 Panel content，并进行修改

先修改 email 处

<div class="form-group">

    <label for="inputEmail3" class="col-sm-2 control-label">Email</label>

    <div class="col-sm-10">

        <input type="email" class="form-control" id="inputEmail3" placeholder="Email">

    </div>

</div>

修改为：

<div class="form-group">

    <label for="book_title" class="col-sm-2 control-label">书名</label>

    <div class="col-sm-10">

        <input type="text" class="form-control" id="book_title" name="book_title" placeholder="书名">

    </div>

</div>

再来修改 password 处，这里需要用到下拉列表，还是去 Bootstrap 上找

在 “菜单” -> "被支持的控件" 处

复制代码，并进行修改

<div class="form-group">

    <label for="inputPassword3" class="col-sm-2 control-label">Password</label>

    <div class="col-sm-10">

        <input type="password" class="form-control" id="inputPassword3" placeholder="Password">

    </div>

</div>

修改为：

<div class="form-group">

    <label for="inputPassword3" class="col-sm-2 control-label">出版社</label>

    <!-- 下拉列表 -->

    <div class="col-sm-10">

        <select class="form-control" name="publisher">

            {% for publisher in publisher_list %}

                <option value="{{ publisher.id }}">{{ publisher.name }}</option>

            {% endfor %}

        </select>

    </div>

</div>

接着修改剩下的部分

最后在 form 表单处添加 action 和 method

运行效果：

编辑书籍：

最后修改 edit_book.html

<!DOCTYPE html>

<!-- saved from url=(0042)https://v3.bootcss.com/examples/dashboard/ -->

<html lang="zh-CN">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    <meta http-equiv="X-UA-Compatible" content="IE=edge">

    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->

    <meta name="description" content="">

    <meta name="author" content="">

    <link rel="icon" href="https://v3.bootcss.com/favicon.ico">

    <title>编辑书籍</title>

    <!-- Bootstrap core CSS -->

    <link href="/static/bootstrap/css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom styles for this template -->

    <link href="/static/dashboard.css" rel="stylesheet">

    <link rel="stylesheet" href="/static/fontawesome/css/font-awesome.min.css">

</head>

<body>

<div class="container">

    <div class="row">

        <div class="col-md-6 col-md-offset-3">

            <div class="panel panel-primary">

                <div class="panel-heading">编辑书籍</div>

                <div class="panel-body">

                    <form class="form-horizontal" action="/edit_book/" method="post">

                        <input type="text" style="display: none" name="id" value="{{ book_obj.id }}">

                        <div class="form-group">

                            <label for="book_title" class="col-sm-2 control-label">书名</label>

                            <div class="col-sm-10">

                                <input type="text" class="form-control" id="book_title" name="book_title"

                                       placeholder="书名" value="{{ book_obj.title }}">

                            </div>

                        </div>

                        <div class="form-group">

                            <label for="inputPassword3" class="col-sm-2 control-label">出版社</label>

                            <div class="col-sm-10">

                                <select class="form-control" name="publisher">

                                    {% for publisher in publisher_list %}

                                        {# 通过 if 条件判断来选择默认出版社 #}

                                        {% if book_obj.publisher_id == publisher.id %}

                                            {#  默认选择当前书籍关联的出版社 #}

                                            <option selected value="{{ publisher.id }}">{{ publisher.name }}</option>

                                        {% else %}

                                            {# 其他的出版社不选中 #}

                                            <option value="{{ publisher.id }}">{{ publisher.name }}</option>

                                        {% endif %}

                                    {% endfor %}

                                </select>

                            </div>

                        </div>

                        <div class="form-group">

                            <div class="col-sm-offset-2 col-sm-10">

                                <button type="submit" class="btn btn-success">提交</button>

                            </div>

                        </div>

                    </form>

                </div>

            </div>

        </div>

    </div>

</div>

</body>

</html>

修改过程：

首先把 add_book.html 复制过去，然后修改相关标题，把 “添加书籍” 改为 “编辑书籍”

然后在 form 表单下一行添加一个有书籍 id 的 input 标签

然后在书名的那个 input 处添加一个 value

然后将下拉列表的出版社选择改为原 edit_book.html 的

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