Get model array values in controller's service - angularjs

Question

I've been facing an issue since couple of hours. My view template looks like-
<div class="row" ng-repeat="row in CampaignsService.getRows().subItems track by $index">
<div class="col-sm-2">
<select class="form-control dropDownPercent" ng-model="CampaignsService.dropDownPercent[{{CampaignsService.selectCounter}}]" ng-change="CampaignsService.wow(CampaignsService.dropDownPercent, $index)" ng-options="o as o for o in CampaignsService.showPercentDropDown().values">
</select>
</div>
<div class="col-sm-2" style="line-height: 32px">
of visitors send to
</div>
<div class="col-sm-4">
<select class="form-control" ng-model="campaignSelect" ng-options="campaign.Campaign.id as campaign.Campaign.title for campaign in CampaignsService.getRows().items">
<option value=""> Please select </option>
</select>
</div>
<div class="col-sm-4">
<a class="btn btn-default" target="_blank" href="">Show campaign</a>
</div>
Variable CampaignsService.selectCounter is a counter variable and declared in service but when I'm going to use ng-model="CampaignsService.dropDownPercent[{{CampaignsService.selectCounter}}]" it gives me error -
Error: [$parse:syntax] Syntax Error: Token '{' invalid key at column 35 of the expression [CampaignsService.dropDownPercent[{{CampaignsService.selectCounter}}]] starting at [{CampaignsService.selectCounter}}]]
And when I use ng-model="CampaignsService.dropDownPercent['{{CampaignsService.selectCounter}}']" it does not give any error but it takes this variable as string.
My question is how could I create a model array and get model's array values in my service ?? I read many questions in stack community and none of the trick work for me. My service under my script, is
.service('CampaignsService', ['$rootScope', 'AjaxRequests', function ($rootScope, AjaxRequests) {
this.dropDownPercent = [];
this.selectCounter = 0;
var gareeb = [];
this.showPercentDefault = 100;
// this.campaignsData = [];
this.$rowsData = {
items: [], //array of objects
current: [], //array of objects
subItems: [] //array of objects
};
this.getRows = function () {
return this.$rowsData;
}
this.addNewRow = function () {
var wowRow = {}; //add a new object
this.getRows().subItems.push(wowRow);
this.selectCounter++;
gareeb.push(0);
}
this.calculatePercentages = function (index) {
angular.forEach(this.getRows().current, function (data, key) {
if (key == index) {
console.log(data);
}
})
}
this.showPercentDropDown = function ($index) {
var balle = 0;
var start;
angular.forEach(gareeb, function (aha, keywa) {
balle += aha;
})
var last = 100 - balle;
var final = [];
for (start = 0; start <= last; start += 10) {
final.push(start);
}
return this.values = {
values: final,
};
}
this.wow = function (valueWa, keyWa) {
console.log(this.dropDownPercent);
gareeb[keyWa] = valueWa;
this.changePercentDropDown();
}
this.changePercentDropDown = function () {
var angElement = angular.element(document.querySelector('.dropDownPercent'));
angular.forEach(angElement, function (data, key) {
console.log(data);
})
}
}])
Target model structure should be
ng-model="CampaignsService.dropDownPercent[1]"
ng-model="CampaignsService.dropDownPercent[2]"
ng-model="CampaignsService.dropDownPercent[3]"
A big thanks in advance.

Answer 1

Since you are in context of the Angular expression, you don't need interpolation tags {{...}}. So ngModel directive should look like this:
ng-model="CampaignsService.dropDownPercent[CampaignsService.selectCounter]"