How to elegantly control the front-end link style in Django backend?

How to elegantly control the front-end link style in Django backend?

In Django backend development, dynamically controlling the style of front-end elements, such as setting the link class to "select" or "unselect" according to the category slug, is a common requirement. If there are many categories, using if statements directly makes the code verbose and difficult to maintain. This article provides a more elegant solution that effectively simplifies code and improves maintainability.

The key is to optimize the use of if statements and make full use of the advantages of the Django template language. If the link styles of the unselected categories are consistent (for example, they are all "unselect"), you just need to determine whether the current category matches the selected category.

Assume that the view function has obtained the currently selected category selected_cate (including the slug attribute) and all category information categories . You can pass selected_cate.slug to the front-end when rendering a template:

 # views.py
from django.shortcuts import get_object_or_404
from .models import Category # Assume your Category model def my_view(request):
    selected_cate_slug = request.GET.get('cate') # Get selected category slug from GET parameters
    selected_cate = get_object_or_404(Category, slug=selected_cate_slug) if selected_cate_slug else None #Troubleshooting cases where category is not selected categories = Category.objects.all()
    context = {'selected_cate_slug': selected_cate_slug, 'categories': categories}
    return render(request, 'my_template.html', context)

In the front-end template my_template.html , use the Django template language to make judgments:

 {% for category in categories %}
  <a class="{% if cate.slug == selected_cate_slug %}select{% else %}unselect{% endif %}" href="https://www.php.cn/link/87063c3b3376e86a570c9b34334cda1c"> {{ category.name }}</a>
{% endfor %}

This code uses only one if statement, and can dynamically set the class attributes of each link according to selected_cate_slug . This approach transfers complex logic to front-end template processing, simplifying back-end code. When the number of categories changes, you only need to adjust the acquisition method of categories without modifying the if statement itself, thereby improving the maintainability of the code. In addition, the processing of selected_cate_slug is added to avoid potential errors.

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