Python3教程Web开发实战梳理-day12（编写日志列表页）

Day12: 编写日志列表页

MVVM模式不但可用于Form表单，在复杂的管理页面中也能大显身手。因此，在实现分页显示Blog的功能时候，依旧采用MVVM模式，先把后端代码写出来：

在apis.py中定义一个Page类用于存储分页信息：

class Page(object):

    def __init__(self, item_count, page_index=1, page_size=10):
        self.item_count = item_count
        self.page_size = page_size
        self.page_count = item_count // page_size + (1 if item_count % page_size > 0 else 0)
        if (item_count == 0) or (page_index > self.page_count):
            self.offset = 0
            self.limit = 0
            self.page_index = 1
        else:
            self.page_index = page_index
            self.offset = self.page_size * (page_index - 1)
            self.limit = self.page_size
        self.has_next = self.page_index < self.page_count
        self.has_previous = self.page_index > 1

    def __str__(self):
        return 'item_count: %s, page_count: %s, page_index: %s, page_size: %s, offset: %s, limit: %s' % (self.item_count, self.page_count, self.page_index, self.page_size, self.offset, self.limit)

    __repr__ = __str__

Day 12 - 编写日志列表页

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MVVM模式不但可用于Form表单，在复杂的管理页面中也能大显身手。例如，分页显示Blog的功能，我们先把后端代码写出来：

在apis.py中定义一个Page类用于存储分页信息：

class Page(object):

def __init__(self, item_count, page_index=1, page_size=10):
    self.item_count = item_count
    self.page_size = page_size
    self.page_count = item_count // page_size + (1 if item_count % page_size > 0 else 0)
    if (item_count == 0) or (page_index > self.page_count):
        self.offset = 0
        self.limit = 0
        self.page_index = 1
    else:
        self.page_index = page_index
        self.offset = self.page_size * (page_index - 1)
        self.limit = self.page_size
    self.has_next = self.page_index < self.page_count
    self.has_previous = self.page_index > 1

def __str__(self):
    return 'item_count: %s, page_count: %s, page_index: %s, page_size: %s, offset: %s, limit: %s' % (self.item_count, self.page_count, self.page_index, self.page_size, self.offset, self.limit)

__repr__ = __str__

在handlers.py中实现API：

def get_page_index(page_str):
    p = 1
    try:
        p = int(page_str)
    except ValueError as e:
        pass
    if p < 1:
        p = 1
    return p

@get('/api/blogs')
def api_blogs(*, page='1'):
    page_index = get_page_index(page)
    num = yield from Blog.findNumber('count(id)')
    p = Page(num, page_index)
    if num == 0:
        return dict(page=p, blogs=())
    blogs = yield from Blog.findAll(orderBy='created_at desc', limit=(p.offset, p.limit))
    return dict(page=p, blogs=blogs)

管理页面：

@get('/manage/blogs')
def manage_blogs(*, page='1'):
    return {
        '__template__': 'manage_blogs.html',
        'page_index': get_page_index(page)
    }

Vue模式下的MVVM页面代码：
manage_blogs.html:

{% extends '__base__.html' %}

{% block title %}日志{% endblock %}

{% block beforehead %}

<script>
function initVM(data) {
    var vm = new Vue({
        el: '#vm',
        data: {
            blogs: data.blogs,
            page: data.page
        },
        methods: {
            edit_blog: function (blog) {
                location.assign('/manage/blogs/edit?id=' + blog.id);
            },
            delete_blog: function (blog) {
                if (confirm('确认要删除“' + blog.name + '”？删除后不可恢复！')) {
                    postJSON('/api/blogs/' + blog.id + '/delete', function (err, r) {
                        if (err) {
                            return alert(err.message || err.error || err);
                        }
                        refresh();
                    });
                }
            }
        }
    });
    $('#vm').show();
}
$(function() {
    getJSON('/api/blogs', {
        page: {{ page_index }}
    }, function (err, results) {
        if (err) {
            return fatal(err);
        }
        $('#loading').hide();
        initVM(results);
    });
});
</script>

{% endblock %}

{% block content %}

    <div class="uk-width-1-1 uk-margin-bottom">
        <div class="uk-panel uk-panel-box">
            <ul class="uk-breadcrumb">
                <li><a href="/manage/comments">评论</a></li>
                <li class="uk-active"><span>日志</span></li>
                <li><a href="/manage/users">用户</a></li>
            </ul>
        </div>
    </div>

    <div id="error" class="uk-width-1-1">
    </div>

    <div id="loading" class="uk-width-1-1 uk-text-center">
        <span><i class="uk-icon-spinner uk-icon-medium uk-icon-spin"></i> 正在加载...</span>
    </div>

    <div id="vm" class="uk-width-1-1">
        <a href="/manage/blogs/create" class="uk-button uk-button-primary"><i class="uk-icon-plus"></i> 新日志</a>

        <table class="uk-table uk-table-hover">
            <thead>
                <tr>
                    <th class="uk-width-5-10">标题 / 摘要</th>
                    <th class="uk-width-2-10">作者</th>
                    <th class="uk-width-2-10">创建时间</th>
                    <th class="uk-width-1-10">操作</th>
                </tr>
            </thead>
            <tbody>
                <tr v-repeat="blog: blogs" >
                    <td>
                        <a target="_blank" v-attr="href: '/blog/'+blog.id" v-text="blog.name"></a>
                    </td>
                    <td>
                        <a target="_blank" v-attr="href: '/user/'+blog.user_id" v-text="blog.user_name"></a>
                    </td>
                    <td>
                        <span v-text="blog.created_at.toDateTime()"></span>
                    </td>
                    <td>
                        <a href="#0" v-on="click: edit_blog(blog)"><i class="uk-icon-edit"></i>
                        <a href="#0" v-on="click: delete_blog(blog)"><i class="uk-icon-trash-o"></i>
                    </td>
                </tr>
            </tbody>
        </table>

        <div v-component="pagination" v-with="page"></div>
    </div>

{% endblock %}