从Django的循环中提取值 [英] Extracting a value from inside a django loop
问题描述
我有一个Django应用程序，其中我使用模板中的以下内容：
I have a django app where i am using the following in the templates:
{% load mptt_tags %}
<ul>
{% recursetree nodes %}
<li>
{{ node.name }}
{% if not node.is_leaf_node %}
<ul class="children">
{{ children }}
</ul>
{% endif %}
{% if node.is_leaf_node %}
<span ng-bind="progid = {{node.program_id}}"></span>
{% endif %}
</li>
{% endrecursetree %}
</ul>
一旦递归发生的节点的值将会消失。我想知道如何提取这个循环在模板以外的值，使得它可以在其它模板中使用
The values of the node will be gone once the recursion takes place. I would like to know how to extract a values outside this loop in the template such that it can be used in another template?
我想是这样的：
<span ng-bind="progid = {{node.program_id}}"></span>
但是，当我提到这外循环，这是行不通的！
But when i refer it outside the loop, it does not work!
更新：
你可以看到，我想使用进程id的值外循环。
as you can see, i am trying to use the value of progid outside the loop.
推荐答案
您可以尝试为此编写自定义模板标签。请参阅该文档。
You may try to write a custom template tag for this. See the docs.
https://docs.djangoproject.com/en/dev / HOWTO /自定义模板标签/
假设你的任务标签被命名为分配，你会再做
Assuming your assignment tag is named assign, you would then do
{% recursetree nodes %}
{% assign_node node %}
{% endrecursetree %}
然后使用 my_node
{{ my_node.program_id }}
您的模板标签code应该得到的上下文。主上下文总是context.dicts [0]
Your template tag code should be getting the context. The main context is always the context.dicts[0].
您的模板标签模块（名为 bar_tags ）
Your template tags module (named bar_tags):
from django import template
register = template.Library()
@register.assignment_tag(takes_context=True)
def get_dummy_nodes(context, *args, **kwargs):
"""
Just get some dummy objects to work with.
"""
class Node(object):
name = None
def __init__(self, program_id):
self.program_id = program_id
nodes = []
for i in range(0, 10):
nodes.append(Node(i))
return nodes
@register.simple_tag(takes_context=True)
def assign_node(context, node, *args, **kwargs):
"""
Puts your variable into the main context under name ``my_node``.
"""
context.dicts[0]['my_node'] = node
return ''
您的模板：
Your template:
<html>
<body>
{% load bar_tags %}
{% get_dummy_nodes as nodes %}
{% for node in nodes %}
{% assign_node node %}
{% endfor %}
my_node {{ my_node.program_id }}
</body>
</html>
请注意：你最好在视图中做这样的事情。
Note: you should better be doing such things in a view.
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