All component parameters Observers triggered when only one changes.

[mandelcode]

I have this setup:

{{component-1 param1=param1 sharedParam=sharedParam}}
{{component-2 param2=param2 sharedParam=sharedParam}}

And I log all changes inside my components like this:

onParam1Change: function() {
    log("param 1 has changed inside component 1");
}.observes("param1"),

Here's what I get when I change param1:

param 1 has changed inside component 1
shared param has changed inside component 1
shared param has changed inside component 1
will render component 1

... and sharedParam:

shared param has changed inside component 1
will render component 1
param 2 has changed inside component 2
shared param has changed inside component 2
param 2 has changed inside component 2
shared param has changed inside component 2
will render component 2

See this fiddle: https://jsfiddle.net/4bwsqcx1/8/

There are small differences depending on who updated the value (the parent view or one of the components).

This may causes logic issues, performances issues (when a parameter is updated often), and in the worst case infinite loops (for example if a parameter change triggers an ajax request which in turn modifies another parameter).

[jcope2013]

related #11491

[stefanpenner]

Ya this is a duplicate