ui.bootstrap.datepicker is-open not working in modal - angularjs

Question

I´m using the Bootstrap UI datepicker directive and I´m trying to have an datepicker button that opens the datepicker popup like in the original example but it does not work in a modal window.
See PLUNKER
What am I doing wrong?

Answer 1

Just change to: is-open="opened" to:
is-open="$parent.opened"
Fixed Demo Plunker
So relevant snippets of HTML will look like:
<div class="input-group">
<input type="text" class="form-control"
datepicker-popup="dd.MM.yyyy"
ng-model="dt"
is-open="$parent.opened"
ng-required="true"
close-text="Close" />
<span class="input-group-btn">
<button style="height:34px;" class="btn btn-default" ng-click="open()">
<i class="icon-calendar"></i></button> <b><- button not working</b>
</span>
</div>

Answer 2

I had to put a timeout to make it work:
function toggleStart($event) {
$event.preventDefault();
$event.stopPropagation();
$timeout(function () {
vm.isStartOpen = !vm.isStartOpen;
});
}
My template looks like this:
<input type="text" class="form-control"
datepicker-popup ng-model="vm.startDate"
is-open="vm.isStartOpen" />
<span class="input-group-btn">
<button type="button" class="btn btn-default"
ng-click="vm.toggleStart($event)">
<i class="glyphicon glyphicon-calendar"></i>
</button>
</span>

Answer 3

datepicker directive creates its own scope which is not accessible outside.So to solve this you can use.
$parent.isopen
or use some Object property name to avoid prototype Inheritance, like
$scope.config.isopen=true;
ng-model="config.isopen" instead of ng-model="isopen".

Answer 4

You also work like that to initialize the date picker by icon.
HTML
<p class="input-group" ng-disabled="invoiceDateDisable">
<input is-open="opened" type="text" datepicker-popup="M/d/yyyy" ng-model="Date" datepicker-options="dateOptions" />
<span class="input-group-btn">
<button type="button" class="btn btn-default" ng-click="open()"><i class="glyphicon glyphicon-calendar"></i></button>
</span>
</p>
JavaScript
$scope.open = function () {
$scope.opened = true;
};

Answer 5

You don't really need an open function:
<div class="input-group">
<input type="text" class="form-control"
datepicker-popup="dd.mm.yyyy"
ng-model="dt"
is-open="$parent.opened"
ng-required="true"
close-text="Close" />
<span class="input-group-btn">
<button style="height:34px;" class="btn btn-default" ng-click="$parent.opened=!$parent.opened">
<i class="icon-calendar"></i></button> <b><- button not working</b>
</span>
</div>