What is the best practice for repeating strings with the `repeat` filter in AnQiCMS?

In AnQiCMS template development, flexibly using various filters is the key to improving content display efficiency and code simplicity. Wherein,repeatThe filter, with its intuitive function of repeating output strings, can play unexpected roles in specific scenarios.It may seem simple, but if we can master its **practice, it will help us build website interfaces more elegantly.

AnQiCMS as a content management system built with Go language, naturally has the advantages of high performance and high concurrency, and its template engine inherits this characteristic, striving to ensure rich functions while also considering execution efficiency. In this context, it is reasonable to userepeatFilter, allowing us to quickly implement some repetitive visual elements or text structures without introducing complex logic.

UnderstandingrepeatThe working principle of the filter

repeatThe core function of the filter is very clear: it repeats a string according to the number we specify. Its syntax structure is very concise, usually{{obj|repeat:次数}}For example, if we want to print "AnQi CMS" 5 times on the page, we can write it like this:

{{"安企CMS"|repeat:5}}

输出结果会是：EnglishCMSEnglishCMSEnglishCMSEnglishCMSEnglishCMS。

这使得它在处理固定、简单的重复内容时，比传统的forThe loop is more direct and more readable.

repeatThe practical scenarios of the filter

Then, in the actual operation and template development of website content,repeatWhere can the filter really shine?

  1. Create visual separators and decorative elementsIn web design, it is often necessary to use separators to distinguish different content areas. Manually entering a long string of characters is cumbersome and inflexible,repeatThe filter can easily handle it. For example, a simple horizontal rule can be{{ "-"|repeat:80 }}implemented. Or add some emphasis to the content below, like{{ "!!!"|repeat:10 }}The layout of the page can be made clearer, and the code is also neater.

  2. Generate placeholders and quick prototypesAt the beginning of template development, we may not have complete dynamic data, but need to fill in some content to observe the layout effect. At this time,repeatThe filter is a good helper for quickly generating placeholders. For example, to simulate a list containing 3 bullet points, you can write it like this{{ "● "|repeat:3 }}Or quickly display 5 stars for a star rating system{{ "★"|repeat:5 }}。It allows us to quickly set up the page skeleton without backend data support.

  3. Achieve simple status indication or progress barAlthough more complex progress bars often combine JavaScript and CSS, but for some very simple, fixed-step-based status indicators,repeatThe filter can provide a lightweight solution. For example, an icon representing "Completed" or "Active" can be achieved by repeating a character.{{ "✓ "|repeat:currentStep }}(AssumingcurrentStepis a preset number).

  4. Auxiliary layout in dynamic contentSometimes, we need to decide the number of repeated elements based on some dynamic values. For example, in a product list, if the number of tags of the products is dynamic, we canrepeatGenerate the corresponding visual markers, such as{{ tagIcon|repeat:item.tagCount }}where,tagIconis the label icon,item.tagCountis the number of tags for the product.

ApplicationrepeatFiltering practice**

To give full play torepeatThe advantages of the filter, while avoiding potential problems, we should follow the following **practices:**

  • Moderation is the best policy:Even though the high-performance architecture of AnQiCMS written in Go language can effectively handle template rendering, repeatedly outputting excessively long strings may still increase the server's load, especially under high-concurrency access scenarios. Therefore, we should limitrepeatThe frequency is within a reasonable range, usually tens to hundreds of repetitions can meet the vast majority of visual needs. If you need to repeat thousands or even tens of thousands of times, it may be necessary to reconsider the requirements, and consider whether it can be achieved through CSS styles (such asbackground-repeat）、JavaScript循环或更优的后端逻辑来替代。

  • 保持代码可读性： repeatThe charm of the filter lies in its simplicity.Use it to repeat simple characters or phrases, which can greatly enhance the readability of the template.However, if you try to repeat too complex HTML structures or large blocks of text, it can make the code bulky and difficult to understand.forLoop orinclude标签通常是更好的选择。

  • Collaborate with CSS and JavaScript: repeatThe filter is mainly used to generate static, repetitive string content.For elements that require dynamic interaction, complex animation, or extensive style control, we tend to use CSS to define styles and layout, and JavaScript to handle dynamic behavior.repeatIt can serve as a starting point for content, but more advanced visual presentations should be handled by the frontend technology stack.

  • Understand its limitations: repeatThe filter is simply a repetition of strings, it does not have the ability to loop through data collections, nor can it execute complex logical judgments. When we need to iterate through arrays, objects, or render based on data content,forloop andifLogic judgment label is the correct tool.repeatIt is supplementary, not substitute.

Sample code.

Let us feel through some specific code snippets.repeatThe practicality of filters:

{# 网站页脚的简单分隔线 #}
<div class="footer-separator">{{ "-"|repeat:100 }}</div>

{# 产品详情页的星级评价展示，假设产品星级是4 #}
{% set productRating = 4 %}
<div class="product-stars">
    {{ "★"|repeat:productRating }}<span>({{ productRating }}星好评)</span>
</div>

{# 博客文章列表中的快速预览缩略图占位，假设文章没有缩略图时显示3个点 #}
{% if article.thumb %}
    <img src="{{ article.thumb }}" alt="{{ article.title }}" class="article-thumb">
{% else %}
    <span class="article-no-thumb">{{ "."|repeat:3 }}</span>
{% endif %}

{# 简单警告信息的重复强调 #}
<p class="warning-message">{{ "注意！"|repeat:3 }}本页面内容仅供参考。</p>

In AnQiCMS,repeatThe filter is a tiny and sharp tool in your template toolbox.Correctly and cleverly using it, it can help you achieve quick and elegant repetition in content display, improve development efficiency, and ultimately bring users a more delicate and professional visual experience.

Common Questions (FAQ)

1.repeatfilters andforWhat are the differences between loops? How should I choose? repeatThe filter is mainly used for repetitionsFixed stringsIt does not have the ability to iterate through data sets. When you just want to repeat a character or phrase multiple times, for example, to create dividers, star ratings, or plain text placeholders,repeatis a more concise and efficient choice. whileforis used fortraversing a data set（such as arrays, lists, or objects），and generate different content for each element in the collection. When you need to display dynamic article lists, product information, or any scenario that requires iterative rendering based on data.forLoops are indispensable.

2. UserepeatDoes the repetition of the filter affect the website performance?For general application scenarios, such as repeated strings of dozens to hundreds of times,repeatThe filter in AnQiCMS's high-performance template engine written in Go language will not have a significant impact on website performance.The efficient features of Go language make string operations inherently fast.However, if you try to repeat a string thousands of times or even more, although the system can still handle it, from the perspective of server resource consumption and page rendering efficiency, this extreme case is not recommended.background-repeat）To handle duplicate background images, or use JavaScript to dynamically generate content on the client side, is often a better solution.

3. I can berepeatDo you filter duplicate HTML tags in the filter?Yes, it can.repeatThe duplicate filtered by the filter is a string, which can be any text, including HTML tags. For example, you can write it like this:{{ "<span>Hello</span>"|repeat:3|safe }}Please note that when the repeated content contains HTML tags, you need to use an additional|safeFilter that tells the template engine that this content is safe HTML, and does not need to be escaped. This allows the browser to correctly parse and display these tags.But when repeating complex HTML structures, please always consider the readability and maintainability of the code. Usually, it is better practice to repeat a concise HTML snippet and control the style through CSS.