Flask Jinja Macro: How can I have dynamic parameter name in URL_FOR?

Question

{% macro dynamic(dynamic_param_name) %}
  ...
  <form action="{{ url_for('main.index', dynamic_param_name=1) }}" method="post">
  ...
{% endmacro dynamic %}

like: {{ dynamic_param_name }}=1

Answer 1

url_for accepts kwargs after first argument.

{% macro dynamic(**kwargs) %}
  ...
  <form action="{{ url_for('main.index', **kwargs) }}" method="post">
  ...
{% endmacro dynamic %}

When you need it, you can call it like this dynamic(dynamic_first=1, dynamic_second=2).

edit:

If what you need is only to change the argument name dynamically, I think you could do it like this:

{% macro dynamic(param_name) %}
{% set keyname={param_name:1} %}
  <form action="{{ url_for('main.index', **keyname) }}" method="post">
{% endmacro dynamic %}