How to Correctly Use ngClass in Angular to Avoid Class Removal Errors?

Conditional Class Application in Angular: Unraveling the Error

In Angular, ngClass allows for dynamic class assignment based on data. However, a common issue occurs when an error arises due to the incorrect removal of an existing class. Understanding the correct syntax of ngClass is paramount in resolving this problem.

The code in the question defines a list of steps with conditional classes based on the current step. The error message indicates that the removal of a class is unsuccessful because the class is not currently assigned.

To rectify this error, Angular provides various ways to conditionally assign classes:

Option 1: Class Binding

[class.my_class] = "step === 'step1'"

Option 2: ngClass Directive

[ngClass]="{'my_class': step === 'step1'}"

Option 3: Number-Based Class assignment

[ngClass]="{'1' : 'my_class1', '2': 'my_class2', '3': 'my_class4'}[step]"

Option 4: Ternary Conditional

[ngClass]="step === 'step1' ? 'my_class1' : 'my_class2'"

In summary, utilizing these methods instead of the erroneous syntax resolves the class removal problem. It is crucial to note that these options align with Angular's correct class manipulation approach, ensuring efficient and error-free code.

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