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Understanding Data Binding in Angular

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22nd Sep, 2023
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    Understanding Data Binding in Angular

    Angular components must have a dynamic data functionality to make them more meaningful and valuable. Having static data may limit its usage as the users will not be able to change their information. The Angular must respond to the user's interaction and record their responses to perform specific tasks. To overcome this, Angular has a very productive module named data binding in Angular. It synchronizes the components and views, making it more interactive and functional.

    Angular data binding deals with how the user's data can be bound with various HTML elements and components. Angular has various features and functionalities that make it easy for a developer to create something new and attractive. They no longer need to write the same code again and again. Instead, they can implement some functionalities using the in-built methods and features available in the language. To learn such exciting features, refer to the best angular course online and build exciting frameworks.

    What is Angular Data Binding? 

    Angular Data Binding is a technique used to maintain and sync the components and the view model. The developers can change or manipulate the web pages and elements through the web browser. The Data binding in Angular is a straightforward process. It does not require complex programming codes and facilities to render the HTML web pages. The data binding angular includes dynamic HTML pages and their related elements.

    The usage of Angular data-binding has an expanded horizon. It is primarily used in web applications with different UI components such as calculators, tutorials, videos, games, forms, etc. When the pages have a massive amount of data, the data binding angular becomes a handy process to deal with it.

    You can learn the AngularJS data binding core concepts and other related concepts from our online web development certificate course. It has a lot of sources available for you to train you properly. You can even get our expert guidance for all your queries and problems.

    Types of Data Binding

    Angular Data Binding has various sub-classifications. But, all of these are categorized into two crucial data binding angular types. There are different types of Data Binding in Angular. Let us study each of these techniques in detail.

    1. Interpolation Binding- Angular Interpolation technique displays the component property with their view templates. It uses double curly braces to wrap up the content of the code. It refers to the expressions inserted into the text. The double curly braces are referred to as delimiters. In the syntax of the interpolation binding, the displayed property within the view template is covered in the curly braces known as the mustache syntax.

    Here we have a code snippet that represents the use case of the Interpolation binding.

    Angular can directly take out the property names of the component and add those values within the browser. It further displays all the changes made by the developers.

    The interpolation binding performs various tasks such as displaying properties, evaluating arithmetic expressions, displaying array items, calling methods, and then displaying the results.

    Here we have examples of each of its uses in their respective orders.

    • Displaying properties- Interpolation can evaluate the strings to text placed within the HTML tags and different attributes. A code snippet following this use case is given below.

    • Evaluating arithmetic expressions- The interpolation can evaluate the arithmetic expressions embedded within the curly braces. We have an example depicting the same. 

    • Display array items- Interpolation can be used along with ngFor directive to get an array of items displayed on the screen. Here's how you can use it. 

     

    • Call methods and display values- Interpolation can invoke the methods through different expressions available within the module.

    1.  Property binding- Property binding is one of the binding techniques used to set values for different properties of all the HTML directives and other elements. Property binding is a technique to implement different functionalities such as a toggle button, setting paths, and sharing values. It is an exclusive one-way data binding where the properties of any DOM element are bound with different fields. Property binding has the following syntax- [binding-target]=" binding-source."

    The target to be bounded is written within the square brackets. It should be the same as the property name. For instance, when we change the binding source, it gets updated within the view module.

    Here's an example of the property binding through which you can implement the same within your code.

    1.  Class binding- It binds up the data of components along with the HTML class. It adds various extra functionalities to the code making it more scalable and readable simultaneously. If your component data is of the type boolean, then it would only be bing if its value is set as accurate. 

    1.  Style binding- Style Binding is a technique used to style the view element. The developers can style the codes according to users’ requirements to make them more attractive. The developers can create dynamic elements by adding styles to only a specific part of the code. 
    1.  Attribute binding- It binds different attributes of an element and components from the view template. It follows a one-way binding approach similar to property binding. 
    1.  Event binding- As the name suggests, this approach binds the events with a specific syntax. Its syntax has a target event used within the brackets (). It handles all the events created by a user and calls specific functions as per the necessity. 

    As the name suggests, event binding is used to combine/ bind different events such as touch, click, hover, keystrokes, etc., along with a component method. Our component can be synced with the view model by keeping track of the user's events.

    For example- A change in the input written in a text box can be updated in the model right after knowing it. As soon as the user saves the changes, they are updated simultaneously within the component model.

    Its syntax is as follows- <target-event)="TemplateStatement" 

    One Way Data Binding 

    One-way data binding is a technique used to bind the data from either side. The flow of data is unidirectional. The critical data will flow only in 1 direction, either from component to view or from the view to the component. It is the most straightforward communication technique where the HTML template changes with a TypeScript code change.

    The developers can update the model in the view, but the model from the view cannot be altered/updated. 

    The Interpolation, Event, and the Property Bindings are examples of one-way angular from the above angular data binding techniques. 

    Two Way Data Binding

    The two-way data binding in angular technique in which the data flows to and back from the component. Whenever a developer changes within the view model, the changes are reflected immediately within the element. The two-way binding in Angular is handy in forms. Any changes made in the user field, the changes are then updated in the model. On the other hand, when a user updates the details in the model, they are reflected within the views component. It has a syntax enclosed within the [()].

    The above figure depicts the working of the two-way binding angular technique. 

    This technique uses a particular directive known as the ngmodel module. It is not exactly a part of the two-way binding in angular but a part of the angular forms module.

    The ngModel used property binding and event binding in the back end. The value is bound using the property binding.

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    Conclusion 

    Hopefully, this guide was beneficial for you to get a deeper understanding of the AngularJS data binding. Here we have tried to explain every relevant topic in detail and simultaneously.

    You must read it carefully to learn and adapt to new things. Also, we have this very informative and helpful course, KnowledgeHut’s best angular course online. It has everything explained descriptively and our experts to provide guidance and help you out every time you need it. So, make sure to check this out. 

    Frequently Asked Questions (FAQs)

    1Which are two types of data binding?

     The two major types of data binding in Angular are- one-way data binding and two-way data binding.

    2What is data binding and types of data binding in Angular?

    Data binding is a way that connects an application's UI along with its data. It is more like combining both of them to create the desired results. Data binding is classified into two main categories: one-way data binding and two-way data binding. The latter is further subclassified into different types. 

    3What is Two-way data binding in Angular?

     Two-way data binding represents a two-way connection between models and views. Changing views can change models and vice-versa.

    4What is data binding in Angular 9?

    Data binding helps to establish a connection between different modules within Angular 9. It refers to the simultaneous actions performed between the modules. 

    Profile

    Bala Krishna Ragala

    Blog Author

    Bala Krishna Ragala, Head of Engineering at upGrad, is a seasoned writer and captivating storyteller. With a background in EdTech, E-commerce, and LXP, he excels in building B2C and B2B products at scale. With over 15 years of experience in the industry, Bala has held key roles as CTO/Co-Founder at O2Labs and Head of Business (Web Technologies) at Zeolearn LLC. His passion for learning, sharing, and teaching is evident through his extensive training and mentoring endeavors, where he has delivered over 80 online and 50+ onsite trainings. Bala's strengths as a trainer lie in his extensive knowledge of software applications, excellent communication skills, and engaging presentation style.

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