Question

我在UserAdminPage中有一个表格，其中的标签按字母顺序排列（下面的代码）。

我想添加一个链接，将按日期更改订单。我知道我会将query.order(owner_tag")更改为query.order("-date")，但是我是否需要创建新的处理程序？

我不明白问号所在的链接是什么。

由于

class UserAdminPage(webapp.RequestHandler):
    def get(self):

...

#-----------tags table-----------------#
            query = Owner.all()
            query.filter("owner =", user)
            query.order("owner_tag")
            w = query.fetch(500)

            user_tag_list = []
            for item in w:
                user_tag_list.append(item.owner_tag)

            unique_tags = sorted(f1.f2(user_tag_list))                 

#-----------holding table start--------#
            self.response.out.write("""
            <table border="0" cellpadding="0" cellspacing="20" >
            <tr>
            <td>""")

#-----------tags table start--------#                                   
            self.response.out.write("""<table border="1">
            <tr>
            <th colspan="3">tags<br />
            #the link that will sort by most recent:
            #<a href="?????">order tags by most recent</a></th>
            </tr>
            """)      

            for tag in unique_tags:

                 self.response.out.write("""
                    <tr>
                    <td><a href="/tag?tag=%s">%s</a></td>
                    </tr>
                    """ %
                    (tag, tag)
                    )

            self.response.out.write("""</table>""")  

            #holding table first column end
            self.response.out.write("""</td>""")
            #holding table second column start
            self.response.out.write("""<td style="vertical-align:top">""")

按照凯文的答案更新代码：

class UserAdminPage(webapp.RequestHandler):
    def get(self):
        order_by = self.request.get("order")

...

#-----------tags table-----------------#
            query = Owner.all()
            query.filter("owner =", user)
            if not order_by:
                query.order("owner_tag")
            elif order_by == "date":
                query.order("-date")
            w = query.fetch(500)

            user_tag_list = []
            for item in w:
                user_tag_list.append(item.owner_tag)

            unique_tags = f1.f2(user_tag_list) 

#-----------holding table start--------#
            self.response.out.write("""
            <table border="0" cellpadding="0" cellspacing="20" >
            <tr>
            <td>""")

#-----------tags table start--------#                                 
#           I put the link here but when I click on it, no table is drawn
#           because the `for` block below draws the tag table
#           so I don't understand how I can draw the table with `order=date`

            self.response.out.write("""<table border="1">
            <tr>
            <th colspan="3">tags<br />
            <a href="/tag?order=date"><span id=small>most recent</span></a></th>
            </tr>
            """)      

            for tag in unique_tags:

                self.response.out.write("""
                    <tr>
                    <td><a href="/tag?tag=%s">%s</a></td>
                    </tr>
                    """ %
                    (tag, tag)
                    )

            self.response.out.write("""</table>""")  

...

Answer 1

有很多方法可以优化您的方法，但要回答您的具体问题 - 而不是复制您的处理程序，您可以向链接添加GET参数，然后在构建查询时检查它：

class UserAdminPage(webapp.RequestHandler):
    def get(self):
        order_by = self.request.get('order')

        query = Owner.all() 
        query.filter("owner =", user)
        if not order_by:
            query.order("owner_tag")
        elif order_by == 'date':
            query.order("-date")

        ...
        <a href="your_page_url?order=date">order tags by most recent</a>

更改表格中标签的显示顺序（Google App Engine-Python）

1 个答案: