Python3教程Web開發實戰梳理-day12（編寫日誌列表頁）__Python

Day12: 編寫日誌列表頁

MVVM模式不但可用於Form表單，在複雜的管理頁面中也能大顯身手。因此，在實現分頁顯示Blog的功能時候，依舊採用MVVM模式，先把後端代碼寫出來：

在apis.py中定義一個Page類用於儲存分頁資訊：

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 - 編寫日誌列表頁

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MVVM模式不但可用於Form表單，在複雜的管理頁面中也能大顯身手。例如，分頁顯示Blog的功能，我們先把後端代碼寫出來：

在apis.py中定義一個Page類用於儲存分頁資訊：

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 > 1def __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中實現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)

管理頁面：

@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頁面代碼：
manage_blogs.html:

{% extends '__base__.html' %}{% block title %}日誌{% 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('確認要刪除“' + blog.name + '”。刪除後不可恢複。')) {                    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">評論</a></li>                <li class="uk-active"><span>日誌</span></li>                <li><a href="/manage/users">使用者</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> 正在載入...</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> 新日誌</a>        <table class="uk-table uk-table-hover">            <thead>                <tr>                    <th class="uk-width-5-10">標題 / 摘要</th>                    <th class="uk-width-2-10">作者</th>                    <th class="uk-width-2-10">建立時間</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 %}