Django 模板迭代列表

发布于 2024-11-01 07:22:36 字数 334 浏览 1 评论 0原文

我在 Django 视图中创建了一个列表：

list = [ elem1, elem2, ..., elemN ]

该列表是可变长度的：它可以包含 0-6 个元素。我想迭代模板中的列表，但我希望循环始终运行 6 次，为不存在的元素生成 None 或空字符串。

我尝试过这样的事情：

{% for i in "0123456" %}
    {{ list.i }}
{% endfor %}

但这显然行不通。我知道我可以在视图中执行此操作，但我希望将其包含在模板中。有可能吗？

原文

I have a list created in Django view:

list = [ elem1, elem2, ..., elemN ]

The list is variable length: it can contain 0-6 elements. I want to iterate over the list in the template, but I would like the loop to run always 6 times, yielding None or empty string for non-existing elements.

I tried something like this:

{% for i in "0123456" %}
    {{ list.i }}
{% endfor %}

but this obviously doesn't work. I know I could do this in the view, but I would like to have this in the template. Is is possible?

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忆离笙 2024-11-08 07:22:36

您可以添加一个 if 语句来检查是否是第六次循环。

{% for item in someList %}
{% if forloop.counter <= 6 %}
{{ item }}
{% endif %}
{% endfor %}

http://docs.djangoproject.com/en/1.3/ref/文档中的 templates/builtins/#for 。
当然，如果您的列表很长，那么这并不是最佳选择。我还建议在views.py 中处理列表，然后将其传递给模板。如果可能的话，逻辑应该保留在视图中。

这使您可以控制完成的循环数量。要完全解决您的问题，您将需要一些额外的逻辑，但请参阅上面关于此的注释。

You can add an if statement checking if it is your 6th time through the loop.

{% for item in someList %}
{% if forloop.counter <= 6 %}
{{ item }}
{% endif %}
{% endfor %}

http://docs.djangoproject.com/en/1.3/ref/templates/builtins/#for in the docs.
Of course, if your list is very long then this is not optimal. I would also suggest processing the list in views.py and then passing it to the template. Logic should stay in the views if possible.

This gives you control over the number of loops done. To completely solve your problem you will need some addtional logic but see my note above regarding this.

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