The two-way data binding is achieved through the use of ng-model directive, which binds the value of an input, select, or textarea element to a variable in the model.

For example, if you have an input element with ng-model="username", any changes made to the input field will automatically update the value of the "username" variable in the model. Similarly, if the value of "username" variable in the model is changed programmatically, it will automatically update the value of the input field in the view.

Here's an example of how two-way data binding works in AngularJs

	<title>AngularJS Two-Way Data Binding Example</title>

		app.controller('myController', function($scope) {

In the above example, the ng-model directive binds the value of the input field to the "username" variable in the model. The initial value of "username" is set to "John" in the controller. When the user enters their name in the input field, the value of "username" is automatically updated in the model, and the value is displayed in the paragraph tag using {{username}} expression.

If the user changes the value of the input field, the value of "username" in the model is automatically updated, and the value is again displayed in the paragraph tag. This is an example of two-way data binding in AngularJS.

Two-way data binding can also be used with other HTML form elements, such as select and textarea. In addition, it can be used with custom directives and components.

It's important to note that two-way data binding can sometimes cause performance issues if not used correctly. This is because every time a value is changed in the view or the model, AngularJS has to perform a digest cycle to check for changes and update the view if necessary. Therefore, it's recommended to use two-way data binding only when necessary and to be mindful of performance considerations.

To further illustrate the use of two-way data binding in AngularJS, here's an example that uses a select element:

		<option value="">--Please choose a color--</option>

	<p>Your favorite color is {{selectedColor}}!</p>

In this example, the ng-model directive binds the value of the select element to the "selectedColor" variable in the model. The initial value of "selectedColor" is set to "blue" in the controller. When the user selects a different color, the value of "selectedColor" is automatically updated in the model, and the value is displayed in the paragraph tag using {{selectedColor}} expression.

Two-way data binding is a powerful feature of AngularJS that makes it easy to keep the view and the model in sync. However, as mentioned earlier, it's important to use it judiciously and be aware of performance considerations.

In addition to the ng-model directive, AngularJS also provides a way to bind data in one direction only, using the ng-bind directive. The ng-bind directive updates the content of an HTML element with the value of an expression in the model, but does not update the model when the content is changed.

	<title>AngularJS One-Way Data Binding Example</title>

In AngularJS, two-way data binding allows automatic synchronization of data between the model and the view. When data in the model changes, the view is automatically updated.

twowaydatabinding

Trending Blogposts on twowaydatabinding

How to do 2-way data binding works in AngularJs?

Popular Discussions on twowaydatabinding

PRODUCTS

QUICK LINKS

LEGAL

twowaydatabinding

Trending Blogposts on twowaydatabinding

How to do 2-way data binding works in AngularJs?

Popular Discussions on twowaydatabinding