angularjs - datepicker popup opens both in start date and end date - angularjs

Question

How can I prevent the datepicker popup from opening at the same time when I click on only 1 input?
Plunkr
<form>
<div class="form-group">
<label for="fromDate">From:</label>
<input type="text" class="form-control" datepicker-popup="{{format}}" ng-model="dt" is-open="opened" datepicker-options="dateOptions" ng-required="true" close-text="Close" show-weeks="false" ng-click="open($event)" name="fromDate" id="fromDate" />
<span class="input-group-btn">
<button type="button" class="btn btn-default" ng-click="open($event)">
<i class="glyphicon glyphicon-calendar"></i>
</button>
</span>
</div>
<div class="form-group">
<label for="toDate">To:</label>
<input type="text" class="form-control" datepicker-popup="{{format}}" ng-model="toDate" is-open="opened2" datepicker-options="dateOptions" ng-required="true" close-text="Close" show-weeks="false" ng-click="open($event)" name="toDate" id="toDate" />
<span class="input-group-btn">
<button type="button" class="btn btn-default" ng-click="open($event)">
<i class="glyphicon glyphicon-calendar"></i>
</button>
</span>
</div>
</form>

Answer 1

I looked at your plunkr. In your script.js file you have the following
$scope.open = function($event) {
$event.preventDefault();
$event.stopPropagation();
$scope.opened = true;
$scope.opened2 = true;
};
$scope.opened = true; and $scope.opened2=true; are both being set. This is forcing both of them to open. You are calling this function when either of the calendar buttons is clicked
ng-click="open($event)"
is-open will force the calendar to show when the variable is set somewhere else in code as well. Remember it is 2-way binding
As for your solution. A simple way I can think to fix it is to pass another variable into your open method telling it which button was clicked so
$scope.open = function($event, calId) {
$event.preventDefault();
$event.stopPropagation();
if(calId===1) $scope.opened = true;
if(calId===2) $scope.opened2 = true;
};
Then in your html for the buttons change to the following passing in a 1,2,3 etc.. for whichever datepicker on the page you want to display.
ng-click="open($event,1)"