一、前言
我们经常见到的,如果需要在每一行的数据前面加上序号咋办?是用数据库里面的id,错了,我们需要用一个for循环里面的东西forloop。还有我们需要添加一对多的数据,就是往一个有外键的表里面插入数据。今天我们就来写一个增加一对多的数据示例
二、forloop添加序号
2.1、单循环
说明:我们在单个for循环下,获取序号。
①顺序从1开始,即:forloop.counter
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{
%
for
row
in
v2
%
}
<tr h
-
id
=
"{{ row.nid }}"
b
-
id
=
"{{ row.business_id }}"
>
<td>{{ forloop.counter }}<
/
td>
#顺序从1开始
<td>{{ row.hostname }}<
/
td>
<td>{{ row.business__caption }}<
/
td>
<
/
tr>
{
%
endfor
%
}
|
如图:
②顺序从0开始,即:forloop.counter0
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{% for row in v2 %}
<
tr
h-id="{{ row.nid }}" b-id="{{ row.business_id }}">
<
td
>{{ forloop.counter0 }}</
td
> #顺序从0开始
<
td
>{{ row.hostname }}</
td
>
<
td
>{{ row.business__caption }}</
td
>
</
tr
>
{% endfor %}
|
如图:
③倒叙以1结束,即:forloop.revcounter
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{% for row in v2 %}
<
tr
h-id="{{ row.nid }}" b-id="{{ row.business_id }}">
<
td
>{{ forloop.revcounter }}</
td
>
<
td
>{{ row.hostname }}</
td
>
<
td
>{{ row.business__caption }}</
td
>
</
tr
>
{% endfor %}
|
如图:
⑤倒叙以0结束,即:forloop.revcounter0
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{% for row in v2 %}
<
tr
h-id="{{ row.nid }}" b-id="{{ row.business_id }}">
<
td
>{{ forloop.revcounter0 }}</
td
> #倒叙以0结束
<
td
>{{ row.hostname }}</
td
>
<
td
>{{ row.business__caption }}</
td
>
</
tr
>
{% endfor %}
|
如图:
2.2、for语句嵌套循环
说明:我们需要获取嵌套循环的信息的话,那么就需要用到forloop.parentloop的功能了
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{% for i in v2 %}
{% for row in v2 %}
<
tr
h-id="{{ row.nid }}" b-id="{{ row.business_id }}">
<
td
>{{ forloop.parentloop }}</
td
> #获取父循环的信息
<
td
>{{ row.hostname }}</
td
>
<
td
>{{ row.business__caption }}</
td
>
</
tr
>
{% endfor %}
{% endfor %}
|
如图:
如果想获取父循环中的counter字段的值:
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{% for i in v2 %}
{% for row in v2 %}
<
tr
h-id="{{ row.nid }}" b-id="{{ row.business_id }}">
<
td
>{{ forloop.parentloop.counter }}</
td
> #父循环信息中获取counter值
<
td
>{{ row.hostname }}</
td
>
<
td
>{{ row.business__caption }}</
td
>
</
tr
>
{% endfor %}
{% endfor %}
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如图:
其他的以此类推,不过这玩意几乎用不到,这边只是介绍一下。
三、增加增加一对多数据示例
3.1、urls.py的连接
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from
django.contrib
import
admin
from
django.urls
import
path,re_path
from
app01
import
views
urlpatterns
=
[
path(
'admin/'
, admin.site.urls),
re_path(
'^host/$'
,views.host)
]
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3.2、templates的模板信息host.html
1 <head> 2 <meta charset="UTF-8"> 3 <title>Title</title> 4 <style> 5 .hide{ 6 display: none; 7 } 8 .shade{ 9 position: fixed; 10 top:0; 11 right:0; 12 left:0; 13 bottom: 0; 14 background: black; 15 opacity: 0.6; 16 z-index: 100; 17 } 18 .add-modal{ 19 position: fixed; 20 height: 300px; 21 width: 400px; 22 top:200px; 23 left: 50%; 24 z-index: 101; 25 border: 1px solid white; 26 background: white; 27 margin-left: -200px; 28 } 29 </style> 30 </head> 31 <body> 32 <h1>主机列表(对象)</h1> 33 <div> 34 <input id="add_host" type="button" value="添加"/> 35 </div> 36 <table border="1"> 37 <thead> 38 <tr> 39 <th>序号</th> 40 <th>主机名</th> 41 <th>IP</th> 42 <th>端口</th> 43 <th>业务线名称</th> 44 <th>业务线编码</th> 45 </tr> 46 </thead> 47 <tbody> 48 {% for row in v1 %} 49 <tr h-id="{{ row.nid }}" b-id="{{ row.business.id }}"> 50 <td>{{ forloop.counter }}</td> 51 <td>{{ row.hostname }}</td> 52 <td>{{ row.ip }}</td> 53 <td>{{ row.port }}</td> 54 <td>{{ row.business.caption }}</td> 55 <td>{{ row.business.code }}</td> 56 </tr> 57 {% endfor %} 58 </tbody> 59 </table> 60 61 <div class="shade hide"></div> 62 <div class="add-modal hide"> 63 <form method="post" action="/host/"> 64 <div class="group"> 65 <input type="text" placeholder="主机名" name="hostname"> 66 </div> 67 <div class="group"> 68 <input type="text" placeholder="IP" name="ip"> 69 </div> 70 <div class="group"> 71 <input type="text" placeholder="端口" name="port"> 72 </div> 73 <div class="group"> 74 <select name="b_id"> 75 {% for row in business_list %} 76 <option value="{{ row.id }}">{{ row.caption }}</option> 77 {% endfor %} 78 </select> 79 </div> 80 <input type="submit" value="提交"> 81 <input id="cancel" type="button" value="取消"> 82 </form> 83 </div> 84 <script src="/static/jquery-1.12.4.js"></script> 85 <script> 86 $(function(){ 87 $("#add_host").click(function(){ 88 $(".shade,.add-modal").removeClass("hide"); 89 }); 90 91 $("#cancel").click(function(){ 92 $(".shade,.add-modal").addClass("hide"); 93 }); 94 }) 95 </script> 96 </body> 97 98 host.html
3.3、view.py的代码
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def
host(request):
if
request.method
=
=
"GET"
:
v1
=
models.Host.objects.
filter
(nid__gte
=
1
)
business_list
=
models.Business.objects.
all
()
return
render(request,
"host.html"
,{
'v1'
:v1,
"business_list"
:business_list})
elif
request.method
=
=
"POST"
:
h
=
request.POST.get(
"hostname"
)
i
=
request.POST.get(
"ip"
)
p
=
request.POST.get(
"port"
)
b
=
request.POST.get(
"b_id"
)
models.Host.objects.create(
hostname
=
h,
ip
=
i,
port
=
p,
business_id
=
b
)
return
redirect(
"/host/"
)
#注意了,这边不要用render,因为render是需要渲染数据的,如果用这个,你压根就没有往里面传数据,跳转页面就会变成空,所以还是增加完毕直接跳转即可
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如图:
模态对话框: