AnQiCMS (AnQiCMS) is a preferred tool for many enterprises and content operators due to its flexibility and powerful customization capabilities. Among them,{% diy %}Tags serve as the key to display dynamic content, allowing us to customize various information in the background and present it on the website's frontend. Then, if no specific customized content is set in the background, the frontend uses{% diy %}What happens when you call the label? As an experienced website operation expert, I am very happy to delve into this mechanism for you.

Understanding{% diy %}The core function of the tag

First, let's briefly review.{% diy %}The location of the label. In AnQiCMS,{% diy %}Tags are specifically designed to retrieve custom setting information from the backend.This information is usually global or general content for a website, such as the company's promotional slogans, specific contact information, additional information in copyright statements, or some temporary announcement text, etc.name="字段名称"The form of the expression is used to call it accurately. This design greatly improves the manageability and maintainability of website content, avoiding the tediousness of directly modifying template code.

When the content is not set,{% diy %}Label display mode

Now let's get back to our core issue: if the backend doesn't set for a certainnamespecified custom content to be set, what will be returned when the front-end calls{% diy %}the label?

The answer is:It will return an empty string (empty string).

This means, when the template contains{% diy with name="您的自定义字段" %}When executed, if the backend does not find the corresponding content named "Your custom field", no error message, placeholder, or exception prompt will appear on the front-end page. It will simply output a blank space as if there is nothing there.

This processing method is one of the design considerations of AnQiCMSan elegant and robust demonstration.It follows the common practices of mainstream template engines (such as Django template engine, AnQiCMS is similar in syntax) that adopt the 'silent handling' principle for missing data.

  1. Avoid page crashes and error messages:If the system throws an error when it cannot find content, it may cause the front-end page rendering to break, and the user will see an unfriendly error page.Ensure that the page loads normally and the user experience is smooth if an empty string is returned.
  2. Maintain the cleanliness of the page structure:It will not be affected by a singlediyThe absence of content and leaving a blank in the front-endnull/undefinedOr other technical terms, which are crucial for pursuing a perfect user interface and good SEO performance. Search engines prefer clean, non-redundant code pages.
  3. Simplify template development:Template developers do not need todiywrite complex conditional judgments for each tag to check if the content exists, thus reducing redundant code and improving development efficiency.

The impact in practical application and **practice

Understood{% diy %}After the behavior of tags when the content is not set, we can better carry out template development and content operation:

  • Front-end display:If you use it directly in the template{% diy with name="某个字段" %}The corresponding position on the page will be blank when this field is not set.
  • Assigned to the variable:If you assign it to a variable, for example{% diy myVar with name="某个字段" %}so thatmyVarIt will be an empty string. Subsequent operations on it (such as printing, concatenation) will be based on its empty value attribute.myVarAny operation on it (such as printing, concatenation) will be based on its empty value attribute.

To better utilize this feature and avoid the page display not meeting expectations due to missing content, I suggest the following **practice**:

  1. UtilizeifConditional rendering of statements:When a certaindiyWhen the content is crucial for page layout or information transmission, it can be配合ifused to determine if the content exists and render related elements only when it does.

    {% diy companySlogan with name="公司口号" %}
{% if companySlogan %}
    <p class="slogan">{{ companySlogan }}</p>
{% endif %}

  2. UsedefaultFilters provide alternative content:For scenarios where a default prompt or placeholder is desired even if the content is missing, AnQiCMS provides thedefaultthe filter is very useful.

    <p>联系电话：{{ diy("联系电话")|default:"暂无联系方式" }}</p>

    Here it directly uses thediy("字段名")functional call method, which is{% diy with name="字段名" %}The syntax is equivalent in the final effect, and it may be more concise in such simple scenarios.

  3. Backend content management needs to be rigorous:As a website operator, one should ensure that all criticaldiyThe content has been set in the background.Regularly check the display effect of the website's front-end to ensure that all expected custom information is presented correctly.Especially after creating a new site or changing the template, it is necessary to check carefully.

Summary

{% diy %}Labels play an important role in dynamic content management in AnQiCMS.When the background does not set the custom content it calls, it will gracefully return an empty string instead of throwing an error, which reflects the robustness of the system design and consideration for user experience.ifsentences anddefaultFilters and template tricks, we can build a more flexible, stable, and user-friendly AnQiCMS website.

Common Questions (FAQ)

Q1: Why does AnQiCMS return an empty string instead of displaying 'N/A' or an error message when custom content is not set?A1: AnQiCMS uses the design of returning an empty string to ensure the stability of the website's front-end and the smoothness of the user experience.This "silent processing" mechanism can prevent page rendering interruption or technical error prompts caused by missing background content, and it is also beneficial for search engine optimization, maintaining the cleanliness of the page code.

Q2: If I want to{% diy %}Label content missing, how should a default text be displayed?A2: You can use the template'sdefaulta filter. For example,{{ diy("公司电话")|default:"暂无公司电话" }}If the "Company Phone

Q3: Where should I set in AnQiCMS backend?{% diy %}Custom content that can be called by tags?A3:{% diy %}Labels that can be called for custom content are usually configured under the sub-items of the "Background Settings{% diy %}tags to call.