In the daily use of AnQiCMS templates, we often encounter scenarios where we need to perform operations on strings, which includessplitThe filter is undoubtedly a very practical tool, which can help us split a string into an array according to a specified delimiter.However, a common issue during use is: can this delimiter be dynamically specified using a variable?

Today, let's delve into the AnQiCMS template.splitThe usage of separators in the filter, hoping to provide a clear answer for friends who are using or considering using AnQiCMS.

Understanding the templates in AnQiCMSsplitFilter

AnQiCMS uses a syntax similar to Django template engine, which is concise and efficient.splitThe basic function of a filter is to split a string into an array of strings based on a delimiter. For example, if you have a string containing multiple tags and you want to list them individually,splitIt came in handy.

The standard usage is like this:{{ obj|split:"分隔符" }}

Here,objis the string you want to process,"分隔符"is anothera literal string, which is text written directly in quotes.

Let's look at a simple example: Assume you have a string"splits, the, string, 安企CMS", and you want to split it using a comma followed by a space as a delimiter.

{% set myString = "splits, the, string, 安企CMS" %}
{% set values = myString|split:", " %}
{% for item in values %}
    <span>{{ item }}</span>
{% endfor %}

The code will output:<span>splits</span><span>the</span><span>string</span><span>安企CMS</span>

From this example, we can see,splitThe filter performs well when processing fixed delimiters. Additionally, AnQiCMS also providesmake_lista filter, if you need to split a string into an array of charactersmake_listWill be more convenient.

splitDoes the filter support variables as delimiters?

Answer this question directly: According to the current template syntax design of AnQiCMS and the existing document examples,splitFilternot directly supportedUse a variable as its delimiter.

This means you cannot try to pass a variable dynamically like this:splitAs a delimiter for the filter:

{% set myString = "item1-item2-item3" %}
{% set myDelimiter = "-" %}
{% set values = myString|split:myDelimiter %}  {# 这种写法通常是无效的 #}

In most template engines, filter parameters (especially likesplitThis needs a specific string pattern) is typically treated as a literal rather than a dynamic variable during template parsing or compilation.Passing a variable directly as a filter argument can lead to template parsing errors, or the filter may not correctly identify your intention, thus not working as expected.

The documentation aboutsplitThe example of a filter, all of which clearly use quoted literal strings as delimiters, without mentioning or demonstrating the use of variables to pass the delimiter. This further confirms the conclusion that variables are not supported as delimiters.

How to implement the requirement of dynamic string splitting?

Although it is at the template levelsplitThe filter does not directly support variable separators, but this does not mean that we cannot achieve the need for dynamic string separation. For different scenarios, we can adopt the following two main strategies:

  1. Process data on the backend (Go language code) recommendedThis is the most recommended and most flexible solution.AnQiCMS is developed in Go language, which is very powerful in string processing.You should complete the string splitting logic in the backend code before passing the data to the template.

    • Implementation idea:In your Go language controller or service layer, obtain the original string and the variable used as a delimiter. Then, use the Go standard library ofstrings.Split()The function performs a split operation. The split string array is passed as part of the data to the front-end template.
    • Advantages:
      • Clear separation of responsibilities:The template focuses on data display, with business logic and data processing handled by the backend, making the code easier to maintain.
      • Greater flexibility:Go language provides more complex string processing capabilities, which can handle various dynamic and complex splitting needs, including regular expressions, etc.
      • Performance optimization:It is usually more efficient on the backend, reducing the burden on the template engine during parsing.

    For example, in your Go backend code:

    // 假设myString和myDelimiter是从数据库或请求中获取的
myString := "苹果,香蕉,橙子"
myDelimiter := ","


// 使用Go的strings.Split进行分割
splitValues := strings.Split(myString, myDelimiter)


// 将splitValues传递给模板
// ctx.View("your_template.html", pongo2.Context{"values": splitValues})

    Then, in the template, you can directly iterate over this already split array:

    {% for fruit in values %}
    <p>{{ fruit }}</p>
{% endfor %}

  2. Process through JavaScript on the front end (only for client display)?If your string splitting needs are just for display in the user's browser without involving backend logic, SEO, or content generation, you can process it on the client side with JavaScript.

    • Implementation idea:Pass the complete string and delimiter variables to the template, and then use JavaScript to retrieve these values after the page has loaded, and call the JavaScript'sString.prototype.split()【en】The method is divided up.
    • Advantages:【en】Do not increase server load.
    • 【en】Limitations: This method is only suitable for pure client-side display. It is not applicable for scenarios such as search engine content crawling, initial page rendering speed, or complex data processing on the server side.

Summary

In the AnQiCMS template system,splitA filter is a powerful string processing tool, but it is currently designed to use literal strings as delimiters and does not directly support specifying delimiters dynamically through variables.To meet the need for dynamic string separation, we strongly recommend performing data preprocessing in the AnQiCMS backend written in Go and passing the processed data to the template for display.This not only ensures the template's tidiness and efficiency, but also fully utilizes the powerful capabilities of the Go language to handle complex business logic.

Common Questions (FAQ)

Q1:splitWhat are the common scenarios for filters in AnQiCMS?A1:splitThe filter is very suitable for processing string data separated by specific characters (such as commas, semicolons, dashes). For example, you might have a field storing article tags with the value 'SEO optimization, website operation, content marketing', usingsplitIt can be easily split into individual label items for display or linking.Moreover, extracting data from CSV formatted strings or splitting path strings into directories and filenames are also common applications.

Q2: BesidessplitWhat other filters related to string operations does AnQiCMS template provide?A2: AnQiCMS template built-in rich filters for various string operations. For example:

  • join: AndsplitIn contrast, concatenate the array elements into a string with a specified delimiter.
  • replace: Replace a specific substring in the string.
  • trim/trimLeft/trimRight: Remove spaces or specific characters from the beginning and end of the string.
  • truncatechars/truncatewords: Truncate a string to a specified length and add an ellipsis (supports HTML tags).
  • upper/lower/capfirst/title: Convert the case of a string.
  • length: Get the length of a string.
  • urlencodeEncode URL parameters. These filters can help us efficiently handle and display text information at the template level.

Q3: Why does AnQiCMS template engine not support variables directly assplitdelimiters?An A3: Many template engines are designed to be performance-oriented, secure, and simplify parsing logic, so they agree that certain filter parameters (especially those that affect the underlying parsing behavior) must be literals.This means that the delimiter is already determined before the template is compiled or rendered.If variables are allowed, the template engine cannot know the exact delimiter at preprocessing time and needs to be dynamically parsed at runtime, which increases complexity and may cause additional performance overhead.Therefore, placing complex data processing logic on the backend (Go code) and letting the template focus on rendering is a recommended practice for AnQiCMS and many other high-performance CMSs.