Creating Optional HTML Attributes

Using conditional expressions, we can use Razor to construct optional HTML properties that are only included when specific requirements are satisfied. This method gives us the freedom to generate HTML components with different characteristics while maintaining the conciseness of our code.

Here’s a basic example of how to create an optional class attribute:

• condition represents the condition that determines whether the attribute should be included.
• “optional-class” is the value of the attribute.
• The @( … ) syntax is used to switch between C# code and HTML markup.

<div @(condition ? "class=\"optional-class\"" : "")>
    <!-- Content here -->
</div>

You can extend this pattern to include multiple optional attributes:

<div @(condition1 ? "class=\"optional-class1\"" : "") @(condition2 ? "data-toggle=\"tooltip\"" : "")>
    <!-- Content here -->
</div>

Example: Here’s an example with a condition. In this example, the class=”highlight” attribute is added to the <div> element only if the showAttribute variable is true. If showAttribute were false, the attribute would not be included in the output HTML.

Output:

It’s common practice in web development to dynamically create HTML components with optional attributes in response to specific criteria. When working with ASP.NET Core apps and the Razor view engine, this necessity is especially prevalent. With Razor, users can easily generate dynamic web content by integrating C# code with HTML markup in an easy and clear syntax. This article will discuss how to use the Razor view engine in ASP.NET Core apps to quickly generate optional HTML properties.