The @Input() function is failing to display or fetch the latest value that was passed

Question

The @Input() function is failing to display or fetch the latest value that was passed

I am currently working on an angular project, and I've encountered a situation where I'm attempting to send a value from a parent component to a child component using the @Input() decorator. Despite my efforts, the child component continues to display the initial value instead of the updated one sent by the parent component. Can anyone shed light on why this is happening and provide guidance on how to resolve it?

Here's a snippet of the code:

@Input('amt') amount:any =100;

Parent Component Code:

<app-payment [amount]="100*2"></app-payment>

javascript angular typescript angularjs-directive

Answer 1

Answer №1

It is important for the decorator name and variable name to be consistent.

Please update the code from:

@Input('amt') amount:any = 100;

To:

@Input('amount') amount:any = 100;

After making this change, it should function correctly.

Answer 2

It is important for the decorator name and variable name to be consistent.

Please update the code from:

@Input('amt') amount:any = 100;

To:

@Input('amount') amount:any = 100;

After making this change, it should function correctly.

Answer 3

Answer №2

When using the @Input decorator, you have the option to specify a custom argument called bindingPropertyName, which determines how the property can be bound in HTML. If no argument is provided, it defaults to the property name.

For example, if you write:

@Input('amt') amount:any = 100;

You are setting the bindingPropertyName to amt, so to use it in the template, you would need to write something like this:

<app-payment [amt]="100*2"></app-payment>

You can omit the bindingPropertyName and it will default to the property name (in this case, amount) or specify a different value as needed.

Typically, we do not use the bindingPropertyName, but there are situations where for directives, we may want to prevent conflicts with property names by specifying a custom binding property name (prefixed with the directive name).

Answer 4

When using the @Input decorator, you have the option to specify a custom argument called bindingPropertyName, which determines how the property can be bound in HTML. If no argument is provided, it defaults to the property name.

For example, if you write:

@Input('amt') amount:any = 100;

You are setting the bindingPropertyName to amt, so to use it in the template, you would need to write something like this:

<app-payment [amt]="100*2"></app-payment>

You can omit the bindingPropertyName and it will default to the property name (in this case, amount) or specify a different value as needed.

Typically, we do not use the bindingPropertyName, but there are situations where for directives, we may want to prevent conflicts with property names by specifying a custom binding property name (prefixed with the directive name).

The @Input() function is failing to display or fetch the latest value that was passed

Answer №1

Answer №2

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