How Class Is a User-Defined Data Type?
A class is a fundamental concept in object-oriented programming (OOP). It serves as a blueprint for creating objects, which are instances of the class.
In this tutorial, we will explore how classes are user-defined data types in HTML.
Defining a Class
To define a class in HTML, we use the <class> tag. This tag allows us to create a custom data type with its own properties and methods. Let’s take a look at an example of how to define a simple class:
<class name="Person">
<property name="name" type="text" />
<property name="age" type="number" />
</class>
In the above code snippet, we define a class called “Person”. Inside the <class> tag, we specify two properties: “name” and “age”.
The “name” property is of type text, while the “age” property is of type number.
Creating Objects from a Class
Once we have defined a class, we can create objects from it using the <object> tag. Each object created from the class will have its own set of properties and methods. Let’s see how to create objects from our “Person” class:
<object class="Person">
<property name="name" value="John Doe" />
<property name="age" value="25" />
</object>
In the above code snippet, we create an object of the “Person” class. We set the value of the “name” property to “John Doe” and the value of the “age” property to 25.
Accessing Class Properties and Methods
To access the properties and methods of a class, we use the <property> and <method> tags respectively. Let’s see how to access the properties and methods of our “Person” class:
<property name="personName" get="name" />
<method name="printName">
<script>
alert(this.personName);
</script>
</method>
In the above code snippet, we define a new property called “personName”. The value of this property is obtained from the “name” property of the class.
We also define a method called “printName”, which displays an alert with the value of the “personName” property.
Conclusion
In this tutorial, we have learned how classes are user-defined data types in HTML. We saw how to define a class using the <class> tag, create objects from a class using the <object> tag, and access class properties and methods using the <property> and <method> tags.
Classes are an essential part of OOP and allow us to organize our code in a structured manner.
Now that you understand the basics of classes in HTML, you can leverage this knowledge to create more complex and robust applications. Happy coding!