As an experienced website operations expert, I fully understand the importance of making precise judgments when managing and displaying website content.AnQiCMS (AnQiCMS) is provided with many conveniences for content creators with its concise and efficient Go language architecture and flexible Django-style template engine.divisiblebyFilter, it helps us elegantly solve the problem of determining the multiple relationship of numbers, goodbye to the complex modulus operation in templates.

Secure CMSdivisiblebyFilter: easily determine the multiple relationship of numbers

In content operation and website development, we often encounter the need to display content based on the characteristics of certain numbers.For example, you may need to apply different background colors to odd and even rows in a list to enhance readability, or you may want to highlight a special promotional tag when the product ID is a multiple of a specific number (such as 5).%To implement. However, in the template language of AnQiCMS, we have a more intuitive and 'friendly' option:divisiblebyFilter.

divisiblebyWhat is a filter? What can it do for me?

In simple terms,divisiblebyThe filter can help us determine if one number is a multiple of another.It takes two parameters: the number you want to check and another number as the 'divisor'.TrueorFalse)，Clearly tell you the result.

Its core function lies in converting the mathematical division judgment into a logic that can be directly understood and used in the template, thereby avoiding the need to write native mathematical operation expressions in the template file.This not only improves the readability of the template code, but also conforms to the design principle of 'separation of logic and presentation' of the template engine.

How to use AnQiCMS templatedivisiblebyFilter?

divisiblebyThe usage syntax of the filter is very intuitive, following the general rules of AnQiCMS template filters:

{{ 待检查的数字|divisibleby:除数 }}

The 'number to be checked' can be a variable from the template or a direct written numeric literal; the 'divisor' can also be a variable or a numeric literal.

Let us feel its convenience through several practical examples:

Scenario one: Set different styles for odd and even rows in the list

This isdivisiblebyFilter one of the most classic uses. When rendering a list item in a loop, we can useforloop.Counter(representing the current loop index, starting from 1) combineddivisibleby:2to determine the parity of the line number.

{% archiveList archives with type="list" limit="10" %}
    {% for item in archives %}
        <li class="{% if forloop.Counter|divisibleby:2 %}even-row{% else %}odd-row{% endif %}">
            <a href="{{ item.Link }}">{{ item.Title }}</a>
        </li>
    {% empty %}
        <li>暂无内容</li>
    {% endfor %}
{% endarchiveList %}

In this example, ifforloop.CounterIs a multiple of 2 (i.e., even rows),divisibleby:2it will returnTrueThis row will receiveeven-rowclass; Otherwise (odd rows), it will receiveodd-rowclass.

Scenario two: Determine if the product ID is a specific multiple to display promotional information

Assuming you want to display a 'Hot Sale' tag for items with an ID that is a multiple of 5:

{% archiveList products with moduleId="2" type="list" limit="5" %} {# 假设moduleId=2是产品模型 #}
    {% for product in products %}
        <div class="product-card">
            <h3>{{ product.Title }}</h3>
            {% set productId = product.Id %} {# 获取当前产品的ID #}
            {% if productId|divisibleby:5 %}
                <span class="badge hot-sale">热销！</span>
            {% endif %}
            <p>{{ product.Description }}</p>
        </div>
    {% endfor %}
{% endarchiveList %}

Whenproduct.IdIs a multiple of 5,productId|divisibleby:5it will returnTruethereby displaying the 'Hot Sale!' tag.

Combined with other template features

divisiblebyThe filter returns a boolean value, which means it can be seamlessly used with AnQiCMS templates.if/elif/elseThese logical tags. You can even usesetLabels will store the judgment result in a temporary variable for reuse in the later part of the template, improving the clarity of the code:

{% set myNumber = 42 %}
{% set isMultipleOfSeven = myNumber|divisibleby:7 %}

{% if isMultipleOfSeven %}
    <p>{{ myNumber }} 是 7 的倍数。</p>
{% else %}
    <p>{{ myNumber }} 不是 7 的倍数。</p>
{% endif %}

Why choosedivisiblebyInstead of manual modulus?

You might want to think, if AnQiCMS template engine supports arithmetic operation tags (such as%)，I can use{{ number % divisor == 0 }}Isn't it the same?

Indeed, in some cases, arithmetic operators can also achieve similar effects. However,divisiblebyFilters provide a more 'templated' solution with the following advantages:

  • Higher readability: divisiblebyThe literal meaning of 'auto' is 'can be divided by...', and its semantics are very clear, even team members who are not familiar with modulo operations can understand its intention at a glance.
  • Elegant and concise:The template code should be as concise and declarative as possible. Filters provide a way to encapsulate complex logic in smaller, reusable units.
  • Error handling: divisiblebyThe filter will intelligently returnFalse instead of throwing an error and causing the page to fail to render, which enhances the robustness of the template.

In an AnQiCMS that focuses on user experience and development efficiency,divisiblebyFilter is a small but powerful member of your template development toolkit. It makes the judgment of numerical multiples simpler and safer, and also makes your content display logic clearer.

Common Questions (FAQ)

  1. Q:divisiblebyFilter supports negative numbers or floating-point numbers?A: Yes,divisiblebyThe filter can intelligently handle negative numbers and floating-point numbers. For example,{{ 21.0|divisibleby:3.0 }}will also returnTrue，because they can be divided exactly. However, it should be noted that the concept of divisibility in mathematics still applies, and if the result is not an exact multiple, it will returnFalse.

  2. Q: If I want to determine whether a number is odd or even,divisiblebyHow to use the filter?A: Determining whether a number is odd or even isdivisiblebyone of the most common application scenarios of filters. You can use{{ number|divisibleby:2 }}To determine if a number is even. If returnedTrueit means it is even, if returnedFalseit is odd. Combinedif/elseTags andforloop.Counter, you can easily achieve the need for different styles of odd and even rows in a list.

  3. Q:divisiblebyFilter vs using modulo operator (like)%) What is the difference?A: In the AnQiCMS Django-style template engine, it is recommended to usedivisiblebyFilter instead of direct modulus operator%to judge the multiple relationship. Although their mathematical logic is the same, the filter provides a clearer, more template syntax compliant design.divisiblebyCan handle potential non-numeric inputs better (it will returnFalseinstead of throwing an error), and encapsulate the logic judgment in reusable filters, making template code