How to Dynamically Set Model Properties with ng-repeat and $index in AngularJS

Learn how to utilize `ng-repeat` and `$index` in AngularJS to dynamically create model properties without modifying your controller.
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How to Dynamically Set Model Properties with ng-repeat and $index in AngularJS

Managing dynamic data in AngularJS can sometimes be tricky, especially when you want to create model properties on the fly based on user input. This guide addresses a specific scenario where you'd like to use ng-repeat and $index to set model properties dynamically in an AngularJS application.

The Problem

You’re looking to create input fields dynamically and bind their values to a model in your AngularJS application. The goal is straightforward: when rendered, you want a model object that appears like this:

[[See Video to Reveal this Text or Code Snippet]]

The challenge is to achieve this without having to define properties in your controller beforehand. You want all properties to be created on demand as users input data into dynamically generated fields.

The Solution

With AngularJS, you can use the combination of ng-repeat and $index to dynamically assign values to your model. Here’s how you can implement this with a simple adjustment to your input bindings.

Updated Code Snippet

Instead of using the original approach, you can modify your ng-model attribute like so:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

ng-repeat Directive:

This directive is used to iterate over a list or an array. In this case, [].constructor(10) creates an empty array with 10 empty slots. The track by $index part ensures that Angular keeps track of each item in the loop by its index.

Dynamic Model Binding:

In the ng-model, model['prop' + $index] constructs the property name dynamically.

Outcome

With the above code, each input field corresponds to a dynamically created property in your model object. As users type something into these fields, the corresponding properties are automatically populated in the model without needing to define them upfront in the controller code.

Conclusion

Using ng-repeat in conjunction with $index allows you to build a flexible and dynamic user input interface in AngularJS. This method not only keeps your controller code clean but also enables a smooth and dynamic user experience.

Feel free to experiment with this approach in your AngularJS applications, and don’t hesitate to reach out if you have further questions or need assistance!