Resolving TypeError: feature_r5.get is not a function in Angular Forms

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Understanding the Problem

The error indicated in the console arises when trying to access form controls that are not correctly set up in your form's template. The issue usually involves mistakenly iterating over the form values instead of the form controls, or misusing Angular's directives for reactive forms.

Breaking Down the Solution

Let's explore how to resolve this issue and ensure that dynamic form controls can be generated without error.

1. Correctly Accessing Form Controls with a Getter

To access the controls within the FormArray, you should not iterate over the values directly. Instead, you need to use a getter function that returns the FormArray. This allows you to interact with the controls effectively:

Incorrect:

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

Correct Approach:
First, define a getter in your component class:

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

Then, iterate over the controls through this getter:

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

2. Using formGroupName Directive Correctly

Another common mistake is regarding the formGroupName in the template. This directive should be treated as a directive, not an attribute:

Incorrect:

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

Correct:

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

3. Structuring Your Template Efficiently

A cleaner template structure can help improve maintainability. Here is a recommended setup that places the formArrayName outside of the loop, simplifying the rendering process:

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

4. Handling Null or Undefined Values Safely

Always ensure that you're using the safe navigation operator (?.) when accessing properties. This prevents potential errors related to null or undefined objects:

Correct Usage:

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

And for checking errors:

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

Conclusion

Happy coding! If you have further questions or need clarification on any point, feel free to reach out in the comments below.