How to judge if a number can be divided evenly by another number in AnQiCMS templates to achieve conditional display?

In AnQi CMS template development, we often need to display content based on specific conditions, such as adding a special style every few elements in a list or inserting a separator at a specific location.When this condition is used to determine if one number can be evenly divided by another, the powerful template engine of Anqy CMS provides a concise and efficient solution.

The template system of Anqi CMS adopts syntax similar to Django template engine, which makes it very intuitive in handling such logic judgments. To judge whether one number can be evenly divided by another, we mainly use the 'filter' feature in the template, especiallydivisiblebyFilter.

Core Function:divisiblebyFilter

divisiblebyThe filter is designed specifically for checking the divisibility of numbers.Its function is to determine whether one number can be evenly divided by another number and returns a boolean value (True or False).This filter greatly simplifies the logic we use to make such judgments in templates.

Its basic usage is very intuitive:

{{ 待判断的数字 | divisibleby: 除数 }}

For example, if you want to know whether the number10can be2divided evenly, you can write it as:

{{ 10 | divisibleby: 2 }}

This will output:True. If the number is11, it will outputFalse.

Combine condition judgment to achieve flexible display

Just knowing whether a number is divisible is not enough, what's more important is to use this result to implement conditional content display. At this point, it is necessary to combine the conditional judgment tags in the AnQi CMS template.{% if %}.

Assume we have a list of articlesarchiveswe hope to insert a special ad slot or clear the float after every three articles displayed. This is very useful when creating multi-column layouts. We can utilizeforthe loop's built-inforloop.CounterThe variable, it represents the current loop index, starting from 1.

Below is an example of inserting a separator after every three articles in the article list.divHere is an example of a separator element to clear floats.

<div class="article-list">
    {% for article in archives %}
        <div class="article-item">
            <h3><a href="{{ article.Link }}">{{ article.Title }}</a></h3>
            <p>{{ article.Description }}</p>
        </div>

        {# 判断当前文章序号是否能被3整除，如果是，则插入清除浮动的div #}
        {% if forloop.Counter | divisibleby: 3 %}
            <div class="clearfix"></div> {# 用于清除浮动或插入特定内容 #}
        {% endif %}
    {% endfor %}
</div>

In this example,forloop.Counter | divisibleby: 3willforloop.CounterIs returned when the number is 3, 6, 9, etc.TrueThus triggeringdiv.clearfixDisplay.

Another common scenario is to apply different styles to odd and even rows in a list to enhance readability or visual effects. This can also be achieved bydivisiblebyFilter to implement:

<ul class="product-list">
    {% for product in products %}
        <li class="product-item {% if forloop.Counter | divisibleby: 2 %}even{% else %}odd{% endif %}">
            <img src="{{ product.Thumb }}" alt="{{ product.Title }}">
            <h4>{{ product.Title }}</h4>
        </li>
    {% endfor %}
</ul>

Here, whenforloop.CounterFor even numbers (2, 4, 6…), it will addevenclass; for odd numbers (1, 3, 5…), then addoddclass.

modulo operator%as an alternative option

ExceptdivisiblebyFilter, you can also use the traditional modulus operator%to make the same judgment. The modulus operator returns the remainder of the division of two numbers.0If the remainder is 0, it means that it can be evenly divided.

For example:

{# 使用模运算符判断10是否能被2整除 #}
{% if 10 % 2 == 0 %}
    <p>10能被2整除</p>
{% endif %}

In terms of function,divisiblebyfilters andX % Y == 0the judgment is equivalent. However, in the template,divisiblebyThe filter is often considered more readable because it directly expresses the intent of 'whether it can be evenly divided', and the code also looks simpler.

Expansion of practical application scenarios

This divisibility judgment logic is widely used in website operation and template design:

  • Grid layout adjustment：Create responsive layouts by dynamically inserting clear floats or line break characters based on the number of elements displayed per row (for example, 4 elements per row on PC and 2 elements per row on mobile devices).
  • Content Group DisplayFor example, after every 5 news content, insert a 'View More' link or switch to a new display module.
  • Special Promotion or Event DisplayIn the product list, every Nth product displays a 'Limited-time Discount' or 'Hot' tag.
  • Page style optimizationIn some custom pagination components, it may be necessary to adjust the style or display content based on the parity of the current page number or some special divisibility rule.

PassdivisiblebyFilter is related toifThe combination of tags, the template engine of Anqi CMS provides great flexibility to website developers, enabling them to easily achieve various conditional display requirements based on numerical order, thereby creating a more dynamic and engaging user interface.

Common Questions (FAQ)

1.divisiblebyFilter can only be used for integers?

divisiblebyFilter is mainly designed to determine the divisibility relationship between integers. Although it may accept floating-point numbers in the underlying processing, the semantics of divisibility judgment usually occur within the integer range, for example, determining10Can be3divided evenly instead of10.5Can be2.5divided evenly. When using, it is recommended to ensure that the number to be judged and the divisor are both integer types to avoid unexpected results.

2. How can I check if a number 'cannot' be evenly divided by another number?

You can simply do it in{% if %}before the statementnotkeywords. For example, if you want toforin a loop, whenforloop.CounterCannot be divided by2Perform some operations when divisible (i.e., odd lines), and it can be written like this:

{% if not (forloop.Counter | divisibleby: 2) %}
    {# 这是奇数行才会显示的内容 #}
{% endif %}

3. Can I check multiple divisibility conditions in the same conditional statement?

It can be. The template engine of Anqi CMS supportsandandorlogical operators, you can use in{% if %}to combine multipledivisiblebyfilters or other conditions. For example, if you want toforloop.Counterbe3Divisible and divisible by5Execute operation when divisible

{% if (forloop.Counter | divisibleby: 3) and (forloop.Counter | divisibleby: 5) %}
    {# 当序号是15、30等数字时显示 #}
{% endif %}

This makes the conditional judgment of the template more flexible in complex layout and content display logic.