In the template world of AnQi CMS, we often need to dynamically combine different content blocks or data, whether it is the sum of numbers or the concatenation of text.addThe filter acts as a flexible bridge, helping us easily achieve content splicing, making the website display more vivid and personalized.

Deep understandingaddThe filter: a bridge between text and data

addThe filter is a very practical feature in the Auto CMS template engine, whose core function is to perform numerical addition and string concatenation.It stands out for its intelligent processing methods: when the operands are numbers, it performs mathematical addition; when the operands are strings or cannot be operated on numerically, it automatically concatenates the text content.It is also worth mentioning that it can cleverly handle mixed data types, and intelligently ignore parts of invalid input (such as null values or unconvertible text) to ensure the smooth rendering of templates.

Its basic usage is very concise, usually written as{{ obj|add:obj2 }}Here,objis the initial value we need to operate on,obj2which is what we want to add toobjThe other value can be a number, a string, or even a template variable.

addUse cases and examples of filters

To better understandaddThe power of the filter, we explore it in several common scenarios.

Imagine a scenario where we need to display a cumulative visit count on a website, or simply merge two numbers.addThe filter can be very intuitive for adding numbers. For example, if we have a variablecurrentViewsrepresents the current number of visits, and we want to addnewViews:{{ currentViews|add:newViews }}IfcurrentViewsYes1000,newViewsYes200, then it will be displayed on the page as1200.

addThe filter performs well in connecting text content.When we need to combine different text fragments into a complete sentence or dynamically generate a description, it can be very useful.{{ product.Brand|add:product.Model }}Ifproduct.Brandis “AnQi”,product.Modelis “CMS”, then “Safe CMS” will be displayed on the page.

addThe true flexibility of the filter lies in its ability to handle mixed connections of numbers and text.In many cases, we need to combine numerical information with descriptive text, such as displaying information like 'Price: 199 yuan'.addThe filter will try to convert numbers to strings and then concatenate them:{{ "价格："|add:product.Price|add:"元" }}Ifproduct.PriceThe value of199Then the final display effect will be "Price: 199 yuan." This automatic conversion mechanism greatly simplifies the writing of templates and avoids the麻烦 of manual type conversion.

When handling variables that may be empty or cannot be converted to valid numbers,addthe filter also shows its intelligent side. For example, if a variablenothingAn unassigned value or an empty value, and we tried to add it to a number:{{ 5|add:nothing }}This is,addThe filter will intelligently ignore:nothing, and the result is still:5.Similarly, if it tries to add a number to a plain text string that cannot be parsed as a number, it will convert the number to a string and then concatenate it with the text.addFilter.

WhyaddIs the filter so practical?

addThe filter occupies a place in the content operation of AnQi CMS due to the following several significant advantages:

  • Dynamic content generation:It allows us to flexibly combine text and numbers from different data sources, easily building dynamic page titles, descriptions, product information, or any content that requires personalized display.
  • Simplify template logic:Through built-in type conversion and intelligent handling of null values,addFilters help us reduce complex condition judgments and data preprocessing in templates, making template code more concise and readable.
  • Improve development efficiency:Whether it's quickly building a test page or adjusting the text structure during content iteration,addThe filters can provide efficient and intuitive solutions, significantly improving the efficiency of content maintenance and development.

Summary

Anqi CMS'saddThe filter is not just a simple addition or concatenation tool, it is more of a powerful capability that empowers content operators and template developers to achieve flexible content combination and display.By understanding and making good use of this filter, we can build more dynamic and personalized website content more efficiently, providing visitors with a better reading experience.

Common Questions (FAQ)

  1. Q:addDoes the filter support other mathematical operations such as subtraction, multiplication, or division?Answer:addThe filter is specifically used for the addition of numbers and the concatenation of strings.It does not directly support subtraction, multiplication, or division, and other mathematical operations.If these operations need to be performed, it is usually necessary to combine other arithmetic operation tags in the template or to implement it through backend data processing.

  2. 问：如果我想拼接的字符串中含有HTML标签，add过滤器会对其进行转义吗？Answer:addThe filter itself does not perform HTML escaping on the content.It simply converts the operands into strings and then concatenates them.|safefilter. For example:{{ "<b>Hello</b>"|add:" World"|safe }}.

  3. 问：在什么情况下add过滤器会忽略一部分内容？Answer:addThe filter shows a 'ignore' behavior when handling certain specific values. Specifically, when the operand isnothing/nil(indicating empty or undefined),addThe filter will bypass the operand as if it were not there, without causing an error or displaying any additional text. For example,{{ "Prefix"|add:nothing|add:"Suffix" }}It will output “PrefixSuffix”.