As an experienced website operations expert, I know that the flexibility of templates in a content management system is crucial for achieving various dynamic content displays.English CMS (EnglishCMS) provides powerful tools for content creators and developers with its efficient architecture based on the Go language and the template engine inspired by Django style.Today, let's delve into a seemingly basic yet extremely practical feature: how to perform arithmetic addition in the template of Anqi CMS, bringing your website data to life.

The addition operation of digital in Anqi CMS template: Use flexibly to make data 'alive'

Understanding the basic of template: Variables and logic

Before delving into advanced arithmetic operations, let's quickly review the basic syntax of the Anqi CMS template. It uses a tagging style similar to the Django template engine:

  • Double curly braces{{ 变量 }}: is used to output the value of a variable.
  • Single curly braces and percentage signs{% 逻辑标签 %}：Used to control the logic of the template, such as conditional judgment (if)、loop (for）etc.

Understanding these two basic elements can help us better master how to perform dynamic calculations in the template.

Direct arithmetic operations: concise and efficient

The template engine of AnQi CMS supports direct basic arithmetic operations when outputting variables. This means you can use the plus sign (+Performing numerical addition. This method is very direct and suitable for scenarios where immediate calculation and display of results are required.

For example, you may want to display the sum of the original price of a product and the tax.

{% set originalPrice = 100 %}
{% set taxRate = 15 %}
<p>商品原价：{{ originalPrice }} 元</p>
<p>税费：{{ taxRate }} 元</p>
<p>商品总价：{{ originalPrice + taxRate }} 元</p>

In this example,{{ originalPrice + taxRate }}It will directly calculate and output115. Besides addition, you can also use subtraction (-), multiplication (*), division (/), modulo (%), and even exponentiation (^）operation. This makes it very convenient to perform simple mathematical calculations in the template.

UseaddFilter: More flexible data processing

In addition to direct arithmetic operators, the Safe CMS also provides a namedaddThe filter, which is more flexible in handling numeric addition, especially in scenarios involving different data types or string concatenation.addThe way to use the filter is{{ 变量 | add:值 }}.

The highlight of this filter is:

  1. Adding numbersOf course, its most basic function is to add numbers.

    {% set num1 = 20 %}
{% set num2 = 5 %}
<p>结果：{{ num1 | add:num2 }}</p> {# 输出 25 #}

  2. Concatenation of strings and numbersWhen you need to combine numbers with strings,addFilter can intelligently handle and implement string concatenation.

    {% set pageCount = 10 %}
<p>{{ "总页数：" | add:pageCount }}</p> {# 输出 "总页数：10" #}

  3. Perform incremental operations on variables.In some loops, you may need to perform some offset calculations based on the loop counter.

    {% for item in archiveList %}
    <p>第 {{ forloop.Counter | add:5 }} 个项目（从第6个开始计数）: {{ item.Title }}</p>
{% endfor %}

    Here,forloop.CounterIs the current iteration number of the loop (starting from 1), through|add:5We can implement a list that counts from 6.

addThe filter will attempt to convert the second parameter to a number during addition operations.If the conversion fails, it will ignore the operation, or intelligently concatenate when involving strings, making it more robust in handling mixed data.

Actual application scenario: Let data tell stories

In the template of AnQi CMS, flexibly using addition can help you build more dynamic and user-friendly interfaces:

  • Shopping cart or order detail pageCalculate the product of the quantity and price of the items and sum them up to get the total order amount.
  • Content number and sortingIn article lists or product displays, generate a serial number with a specific starting offset for each entry.
  • Dynamic prompt information: Combine the data obtained from the background to generate something like “You have3An updated message of this kind is a real-time changing prompt.
  • Page view countAlthough it is usually handled by the backend, in templates, you can also simulate or display some simple incremental count logic, for example{{ item.Views | add:1 }}to indicate that the next visit will be the Xth.

Through these simple syntaxes, you do not need to write complex backend code, and can achieve rich number processing and content dynamization at the template level.

Summary

The digital addition operation in the Anqi CMS template, whether through direct arithmetic operators or powerful functionsaddFilter, providing great convenience for website operators and developers.It makes data no longer static display, but can be calculated and adjusted in real-time according to business requirements and user interaction, thereby greatly enhancing the interactivity and user experience of the website.Master these skills, and you will be able to navigate the AnQi CMS more freely, building websites that are more vibrant and practical.

Common Questions (FAQ)

Q1: Besides addition, what direct arithmetic operations does the Anqi CMS template support?

A1: Besides addition (+) the Anqi CMS template also supports subtraction (-), multiplication (*), division (/), modulo (%) even exponentiation (^）et basic arithmetic operators. You can use them directly in the{{ 变量 操作 数值 }}format for calculations.

Q2: What will happen if I try to add a number with a non-numeric string?

A2: If usedDirect arithmetic operator(such as{{ 10 + "文本" }})，usually results in template rendering errors or unexpected output, as the template engine tries to perform strict numeric calculations. However, if you useaddFilter(such as{{ 10 | add:"文本" }}or{{ "文本" | add:10 }}It will intelligently convert numbers to strings and perform string concatenation, output10文本or文本10This is very useful when you need to embed numbers in text.

Q3: How to implement variable increment or decrement operations in templates, such as incrementing a counter?

A3: Although template engines usually do not directly support operations likevariable++such an assignment operation, but you can combinesetTags andadda filter to achieve a similar effect. For example, if you have a variablecountinitially set to0and you want to add to it in each iteration1You can write it like this:

{% set count = 0 %}
{% for item in items %}
    {% set count = count | add:1 %}
    <p>当前计数：{{ count }}</p>
{% endfor %}

This way can effectively maintain and update a numeric variable within the template.