How to show element once in ng-repeat - angularjs

Question

I need to loop through a list order by price and as soon as the price is not there then I show a message with unavailable but I don't want to show it for each empty element. I'm using angular 1.2
<div ng-repeat="item in list | orderBy: 'cost'">
<div ng-if="cost == 0 and not already shown">Sorry the following are unavailable</div>
<div>...my item here...</div>
<div>

Answer 1

You can conditionally display two spans - one if it's 0 (your 'not available' message) and another for anything else.
<ul>
<li ng-repeat="d in newData track by $index">
<span ng-show="d > 0">{{d}}</span>
<span ng-show="d === 0">Not Available</span>
</li>
</ul>
The data can be passed through a function to pull all the 0 after the first one:
$scope.data = [1,2,3,0,1,0,0,1,0,2]
$scope.pullDupes = function(array) {
var newArray = [];
var zero;
for(var i = 0; i < array.length; i++) {
if (array[i] !== 0) {
newArray.push(array[i])
}
if (array[i] === 0 && !zero) {
zero = true;
newArray.push(array[i])
}
}
return newArray;
}
$scope.newData = $scope.pullDupes($scope.data);
Plunker

Answer 2

You can show only the first message see here :
<div ng-repeat="item in list | orderBy: 'cost'">
<div style="color:red" ng-show="item.cost == 0 && $first">Message Goes Here</div>
<hr>
<div>{{item.name}} - Price : {{item.cost}}</div>
</div>
and here is a plunker for it :
http://plnkr.co/edit/RwZPZp9rFIChWxqF71O7?p=preview
also the ng-if you are using it wrong you need to do it like this item.cost for the next time
Cheers !

Answer 3

Here is the best way I could find to get it done.
Markup
<div class="sold-out-message" ng-if="displaySoldOutMessage(item)">Sorry, sold out</div>
Controller
$scope.firstSoldOutItemId = false;
$scope.displaySoldOutMessage = function(item) {
if ( item.cost ) return false;
$scope.firstSoldOutItemId = $scope.firstSoldOutItemId || item.id;
return item.id == $scope.firstSoldOutItemId;
};

Answer 4

You can try to use $scope.$whatch with a boolean variable like this:
<div ng-model="actualItem" ng-repeat="item in list | orderBy: 'cost'">
<div ng-if="cost == 0 && oneMessage == true">Sorry the following are unavailable</div>
<div>...my item here...</div>
<div>
</div>
And in your controller you look at actualItem :
$scope.oneMessage = false;
var cpt = 0; // if 1 so you stop to send message
$scope.$watch('actualItem',function(value){
if(value.cost == 0 && $scope.oneMessage == false && cpt < 1)
// i don't know what is your cost but value is your actual item
{
$scope.oneMessage = true;
cpt++;
}
else if($scope.oneMessage == true)
{
$scope.oneMessage == false;
}
});
I am not sure about this but you can try it. It's certainly not the best way.