更新模板中变量的值-django [英] update value of a variable inside a template - django

问题描述

我已经看到了足够多的示例，这些示例使我可以在模板内声明新变量并设置其值.但是我要做的是更新模板中特定变量的值.

I have seen enough number of examples that allow me to declare a new variable inside a template and set its value. But what I want to do is to update the value of a particular variable inside the template.

例如，我有一个对象的datetime字段，我想根据模板中的request.user添加时区.因此，我将创建一个类似于{% add_timezone object.created %}的template filter，它将执行的操作是将时区添加到object.created，然后在每次访问{{object.created}}时，它将为我提供更新后的值.

For example I have a datetime field for an object and I want to add timezone according to the request.user from the template. So I will create a template filter like {% add_timezone object.created %} and what it will do is that it will add timezone to object.created and after that whenever I access {{object.created}} it will give me the updated value.

有人可以告诉我如何做到这一点.我知道我需要从模板过滤器更新context变量.但是不知道如何.

Can anybody tell me how this can be done. I know I need to update the context variable from the template filter. But don't know how.

推荐答案

您无法修改模板中的值，但可以使用{% with %}标签定义作用域"变量:

You cannot modify a value in a template, but you can define 'scope' variables using the {% with %} tag:

{% with created=object.created|add_timezone %}
    Date created with fixed timezone: {{ created }}
{% endwith %}

其中add_timezone是一个简单的过滤器:

where add_timezone is a simple filter:

def add_timezone(value):
    adjusted_tz = ...
    return adjusted_tz

register.filter('add_timezone', add_timezone)

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