Dropdown Change Event in Angular | CodeLSC
Introduction
In web development, forms are an essential element that allows users to interact with the application. One of the most commonly used form elements is the dropdown, which allows users to select a value from a list of options. In this blog, we will learn how to handle the change event of a dropdown in Angular using an example code.
What is a Change Event?
A change event is triggered when the value of an element changes, such as when a user selects an option from a dropdown. In Angular, we can handle this event using the (change) event binding.
Code Explanation
The following code is an example of how to handle the change event of a dropdown in Angular. Let's understand each line of code step by step.
Firstly, we import the Component class from the @angular/core module, which is used to define the component's metadata.
Next, we define the component using the @Component decorator, which contains the selector, template, and styleUrls properties. Here, we define the selector as app-root and the template as a dropdown that contains options created using the *ngFor directive.
The *ngFor directive is used to loop through the jsonData array and create an option for each object in the array. We bind the value property of the option to the value property of the object and the option's label to the label property of the object.
We then define a paragraph element that displays the selected value when the dropdown's value changes. We use the *ngIf directive to conditionally display the paragraph element when a value is selected.
In the component class, we define the jsonData array that contains the dropdown options and the selectedValue property that holds the selected value.
Finally, we define the onSelect method that is called when the dropdown's value changes. The method sets the selectedValue property to the value of the selected option.
Conclusion
Handling the change event of a dropdown in Angular is straightforward using the (change) event binding. We can use the selected value to perform further actions or update the application's state. The above example code provides a simple and effective way to handle the change event of a dropdown in Angular.
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