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I have 3 components that exchange an Object among themselves, as I do for when updating one another also upgrade alone?
Example: I have components 1, 2 and 3, 1 calls 2 passing an Object and 2 calls 3 passing the same Object, all this in the creation of the components. I have to update component 3 when Object in component 1 changes.
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To do this you must use @Input, passing from parent to child the value you want.
In this example you have given, the properties of Component 2 and 3 must have the @Input annotation, for parents to 'insert' the value in the children. Component inputa no 2, o 2 inputa no 3, so only 2 and 3 need @Input. And so on.
To send value from children to parents, you must use @Output.
The details of how to use @Input and @Output on the Angular website: https://angular.io/guide/component-interaction
I made an example for you to see working: https://stackblitz.com/edit/angular-pufge7
Browser other questions tagged input angular-6 component objects
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You have to notify the parent event, and so on that an event took place in the child component. You need this directive: https://angular.io/api/core/EventEmitter. Demo here:https://stackblitz.com/ we’ll know the problem better.
– Marconi