Official collapsible feature

[ionitron-bot]

Original issue by @Domvel on 2018-07-05T09:15:23Z

Feature Request

Ionic Info

cli packages: (C:\Users\<Username>\AppData\Roaming\npm\node_modules)

    @ionic/cli-utils  : 1.19.2
    ionic (Ionic CLI) : 3.20.0

global packages:

    cordova (Cordova CLI) : 8.0.0

local packages:

    @ionic/app-scripts : 3.1.9
    Cordova Platforms  : android 7.0.0
    Ionic Framework    : ionic-angular 3.9.2

System:

    Android SDK Tools : 26.1.1
    Node              : v8.9.1
    npm               : 5.5.1
    OS                : Windows 10

Environment Variables:

    ANDROID_HOME : C:\Android\sdk

Misc:

    backend : legacy

Describe the Feature Request
Add a feature for collapsible list / components like the item group.
A list of items which groups are collapsible. Or collapsible cards. etc.
Aka accordion list / components or expansion panel.
This could be an additional parameter for existing components.
Or a brand new component "Accordion List".

Describe Preferred Solution
An official way of the ionic UI framework.

Describe Alternatives
There are some tutorials on web. But this should be a basic UI feature for ionic.
You can inspired by the angular material Expansion Panel.

Examples

These are some examples about the idea. Imagine this in nice ionic style and item-group integration.