Send event from parent to childs without template

[Cedric Cazin]

Hi

I got a parent component which has en @input isEnable, on the setter I want to inform all childs their @input isAnable to the same value.

I don't want to use the template <child [isEnable]='isEnable' > 

but I would like to do like angular js a kind of 'brodcast' to all childs

is this possible ?

regards

[Sander Elias]

Hi Cedric,

There are multiple solutions to your issue. The cleanest one is creating a small service that hosts one(or more) observable(s). 

There is actually a good sample about this in the docs. scroll down to "Parent and children communicate via a service". 
While you are on that page, there are some more examples on exactly this subject.

Regards

Sander

[Cedric Cazin]

Thanks 

that's what I was 'afraid' of... create a service only for one element

[Sander Elias]

Hi Cedric,

You can inject this service only in the component you need it for. And it's not for 1 element, it's for a couple off components/directives right?

Regards

Sander

[Cedric Cazin]

parent component < service > child components

only for onIsEnableChanged

[Sander Elias]

Hi Cedric,

If it's just 1 single variable, there are other solutions in the page I posted.  Perhaps this pattern might suit you a bit better in this case.

Regards

Sander

[Cedric Cazin]

Hi 

thanks for the help, since then I am trying to refactor my project :)

I was wondering what is the best pattern for a configuration class ?

I want the class to send provide event when one of its prop change value.

regards

[Sander Elias]

Hi Cedric,

Use an subject. that is an observable that you can use to 'watch' for changes(subscribe), but also to feed changes (put in the 'next' value).

Regards

Sander