Difference between [ngStyle] and [style] for inline styling in Angular

In Angular, you can use either [ngStyle] or [style.<attr>] to apply inline styles to components. While both methods achieve similar results, there are key differences:

[ngStyle]

• Accepts an object with CSS property names as keys and values as values.
• Can be used to set multiple styles at once.
• Supports property binding, allowing for dynamic style updates.

Example:

<div [ngStyle]="{'background-color': 'blue', 'color': 'white'}"> test text </div> 

[style.<attr>]

• Accepts a single CSS property value.
• Can be used to set a single style attribute.
• Also supports property binding for dynamic updates.

Example:

<div [style.background-color]="'blue'" [style.color]="'white'"> test text </div> 

Key differences:

• Multiple styles: [ngStyle] allows setting multiple styles at once, while [style.<attr>] requires separate bindings for each style attribute.

• Object vs. single value: [ngStyle] expects an object, whereas [style.<attr>] expects a single value.

• Readability and maintainability: For simple, single-style attributes, [style.<attr>] might be more readable. For multiple styles or more complex scenarios, [ngStyle] can be more convenient.

Ultimately, the choice between [ngStyle] and [style.<attr>] depends on your specific use case, personal preference, and the complexity of your styling needs.

Note: For more detail please take reference from here https://blog.angulartraining.com/whats-the-difference-between-style-and-ngstyle-in-angular-68a3301c2ae6

1. The main & obvious difference between [ngStyle] & [style] is in the output:

   • using [style.color]="condition ? 'black' : ''" will add a inline color style to the element in ALL the conditions (true or false)
   • but using [ngStyle]="condition && {'color':'black'}" will add a inline color style to the element ONLY when the condition is true

2. Other than this, [ngStyle] helps in styling with multiple conditions for a better developer experience. For example:

   • using [style.<attr>]: <div [style.color]="hasError ? 'red' : 'black' " [style.font]="font" [style.background-color]="hasError ? 'tomato' : 'white' ">

   • using [ngStyle]:

     <div [ngStyle]="currentStyles"> 

     this.currentStyles = { 'font-style': this.canSave ? 'italic' : 'normal', 'color': this.hasError ? 'red' : 'black', 'font-size': this.hasError ? '24px' : '12px' }; 

References:

• https://jscurious.com/ngstyle-vs-style-binding-in-angular/
• https://blog.angulartraining.com/whats-the-difference-between-style-and-ngstyle-in-angular-68a3301c2ae6