Passing template variable as a filter to Image tags

Hi,

Have you consider doing something like this:

{% for img in self.get_images %}
    {% get_custom_filter forloop.counter as my_filter_var %}
    {% image img my_filter_var %}
{% endfor %}

This is useful when we want to assign different filters depending on the forloop counter, or some other condition.

I’m working on a solution, but for now, my solution only accepts a variable or chained filters. Do you see this being integrated in wagtail?

[mx-moth]

I’ve also come up against this issue before, where I needed to output different sizes based on some criteria. A giant if/elif block in the template is very ugly. Repeat that a number of times if you need to reuse the logic, and accepting a variable for the image filter spec becomes much more desirable.

If a developer abuses this feature, that is on their head. A note could be put in the docs mentioning that making arbitrary sizes will fill up the file system, but limiting the developers freedom hurts more than it helps from where I am coming from.

As an aside, this is actually possible in the Jinja version of the image tag. It accepts a string argument: {{ image(my_img, "max-200x100") }} or {{ image(my_img, my_filter_var) }}.

[favoyang]

Here’s a monkey patch to resolve image specs from a context variable.

https://gist.github.com/favoyang/0641c63fea72485f412ec97de7035691