As a senior AnQiCMS website operation personnel, I fully understand the importance of content in attracting and retaining users.High-quality content not only requires careful creation but also proper formatting and optimization during presentation to enhance user experience and readability.Aneqi CMS provides powerful built-in filter functions with its flexible Django template engine syntax, allowing us to easily process and transform the data format of template variables.

Next, I will give a detailed introduction on how to use the built-in filters of Anqi CMS, especiallytruncatecharsandupper, to optimize the display of your website content.

Understanding Anqi CMS template filters

The template engine of Anqi CMS supports filter syntax similar to Django.The filter is a simple function used to transform the output of template variables.They are typically used for formatting data, truncating text, changing case, or performing other simple processing operations without making complex changes to the backend business logic.This separation makes the template more focused on content display, improving development efficiency and maintainability.

The general syntax format of the filter is:{{ 变量名|过滤器名称:参数 }}.变量名is the data you want to process,过滤器名称is the filter you choose (for example)truncatecharsorupper), while参数is optional, used to provide additional instructions for the filter.

UsetruncatecharsFilter text truncation.

In website operation, we often need to display the concise version of the content in list pages, cards, or summaries.For example, the title or description of an article may be too long and directly displaying it may break the page layout.truncatecharsThe filter can be used.

truncatecharsThe function of the filter is to truncate a string to a specified number of characters and add an ellipsis (...) at the end.This is crucial for creating a unified content preview, maintaining a clean interface, or ensuring text does not exceed the preset area.

Example of usage scenarios:

Assume we have a list of articles that need to display a summary of each article, but we want the summary to be no more than 50 characters long. We can use it like this.truncatecharsFilter:

<p>{{ item.Description|truncatechars:50 }}</p>

In this code,item.DescriptionThis is the introduction content of the article.|truncatechars:50Indicate to the template engine to truncate this introduction to 50 characters. If the original introduction exceeds 50 characters, it will display the first 47 characters followed by “…”.

Considerations for actual application:

  • Maintain layout consistencyWhen designing news lists, product display cards, or any module that requires displaying a text summary,truncatecharsCan help you maintain uniformity in text length, ensuring a beautiful and easy-to-browse page layout.
  • Enhance user experience: Long text can distract users, while a concise summary can help users quickly understand the key points of the content and decide whether to click to view the details.
  • Comparison with other truncation methods【en】Provide by AnQi CMS alsotruncatewords【en】And (truncated by word) andtruncatechars_html/truncatewords_html(Process strings containing HTML tags to avoid destroying the HTML structure) and other filters.In actual operation, you can choose the most suitable truncation method based on the characteristics of the content and specific needs.

Useupper【en】Filter convert to uppercase

Sometimes, to highlight certain text or follow specific design standards, we need to convert the text to uppercase.upperThe filter provides this simple and effective conversion feature.

upperThe function of the filter is to convert all the letters in the string to uppercase.This is very useful for emphasizing phrases, displaying specific tags, or uniformly displaying certain page elements (such as 'View More', 'Buy Now').

Example of usage scenarios:

Assuming you want all menu items in the website's navigation bar to be displayed in uppercase to enhance visual impact, you can use it like thisupperFilter:

<a href="{{ item.Link }}">{{ item.Title|upper }}</a>

Here,item.TitleIs the original title of the navigation item|upperThe filter will convert it to uppercase. For example, ifitem.Titleis 'About Us', it will be displayed as 'About Us'.

Considerations for actual application:

  • Visual EmphasisThe uppercase text can attract users' attention and is suitable for call-to-action (CTA) buttons, important announcements, or concise titles.
  • Brand style consistencySome brands may prefer to use uppercase text on specific elements.upperFilters can help you easily achieve this style.
  • Compared to other case transformation filters: Security CMS also provideslower(converted to lowercase) andcapfirst(capitalize the first letter of the sentence) etc. According to your specific needs, you can choose flexibly.

Filter chaining call

The filter function of the AnQi CMS template engine is not limited to single use; you can also chain multiple filters together to process variables in a series. The syntax for chaining calls is to use pipes between filters.|Connect them together, the output of the previous filter will be the input of the next filter.

Chaining example:

Assuming you need a scenario where a description is first truncated, then converted to uppercase, and finally displayed the default value if it is empty:

<span class="preview-text">{{ item.Description|truncatechars:50|upper|default:"暂无描述" }}</span>

In this example:

  1. item.DescriptionFirst truncated.truncatechars:50Truncated.
  2. The truncated result is passed toupperThe filter, converted to uppercase.
  3. If the final result is empty (for example,item.Descriptionitself is an empty string, truncated it is still empty), thendefault:"暂无描述"It will be replaced with “No description available”.

This chained call greatly enhances the flexibility and expressiveness of template processing, allowing you to achieve complex data formatting needs with the minimum amount of code.

Strategies and Points to Note in Practice

Remember the following points when using the template filters of AnQi CMS to achieve **Practice:**

  • Focus on the readability of the contentAlthough the filter function is powerful, overuse or misuse may actually reduce the readability of the content. For example, excessive use of uppercase text may make people feel like they are being 'shouted' at, and should be used with caution.
  • Keep the template conciseThe filter is mainly used for data formatting on the presentation layer. Complex business logic or data calculation should be placed on the backend as much as possible to maintain the cleanliness and readability of the template.
  • Use wiselysafeFilterWhen you need to output content containing HTML tags in a template (such asarchiveDetailthe tags you getContentWhen, to avoid HTML entity escaping (to prevent XSS attacks), it is imperative to use|safefilter. This tells the template engine that the content is safe and does not require escaping.
  • Refer to the official documentation: The template documentation for AnQi CMS is your valuable resource. When in doubt about how to use a filter or when you need to learn more about the filters, please consulttag-filters.mdFile, which contains detailed descriptions and usage examples of all built-in filters.

By mastering the built-in filters of Anqi CMS, especiallytruncatecharsandupperYou will be able to manage and optimize the display of website content more effectively, providing users with a more professional and friendly browsing experience.

Common Questions and Answers (FAQ)

1. Does the Anqi CMS support custom template filters?

According to the document description of AnQi CMS, its template engine supports Django template engine syntax and provides a series of built-in filters for users to use.The document does not mention any open interface or mechanism for custom filter.Therefore, at present, you should mainly rely on the built-in filters provided by the system to complete data processing and format conversion.If there is a specific functional requirement that cannot be met by the existing filters, it is recommended to consider data preprocessing at the backend business logic layer.

2. TotruncatecharsWhat will happen when applying to variables of numeric type?

Filters are usually designed for specific data types, such astruncatecharsandupper主要用于strings. If you try to usetruncatecharsThe filter is applied to a non-string variable (such as a number), and the template engine usually tries to convert it to a string before processing.If the conversion fails or does not meet the expected input of the filter, it may cause the filter not to work properly, output the original value, or may even cause template rendering errors in some cases.To avoid potential issues, it is recommended to ensure that the variable is of string type or can be safely converted to a string before using this filter.

3. Will using many filters affect the website's performance?

For the vast majority of common website scenarios, the impact of using built-in filters in templates on the overall performance of the website can be ignored.The AnQi CMS is a content management system developed based on the Go language, and its backend processing efficiency is very high.Filter operations are typically lightweight string or data transformations.Only in extreme cases, such as performing several complex filter chain calls on tens of thousands of entries within a large loop, may there be a barely perceptible impact on performance.In daily content display and page rendering, you can safely use filters to optimize user experience without worrying too much about performance issues.