html - Non-negitive number button in angular -


i creating counting app using ionic framework. have positive button predefined number (in services.js) , corresponding negitive number same predefined number subtract number. template code;

<a class="item list-inset item-thumbnail-left item item-button-right">                     <img ng-src=" {{ menu.imgsrc1 }} ">                     <h2>{{ menu.fooditem1 }}</h2>                     <p>{{ menu.data1 }}</p>                     <button id="plus" class="button button-icon icon round-button" ng-click="count = count + {{ menu.calories1 }} "> {{ menu.calories1 }} </button>                     <button id="minus" class="button button-icon icon round-button" ng-click="count = count - {{ menu.calories1 }} "> - </button>                 </a>

this services code;

        var menus = [                 {                     title: 'breakfast',                     fooditem1: "cereal",                     data1: 'calories per 250g serving',                     imgsrc1: "img/almond.jpg",                     calories1: 17,                     fooditem2: "bread",                     data2: 'calories per wholegrain slice',                     imgsrc2: "img/almond.jpg",                     calories2: 25,                     fooditem3: "pastries",                     data3: 'calories per piece',                     imgsrc3: "img/almond.jpg",                     calories3: 75                 },                 {                     title: 'lunch',                     description: 'wrap, sandwich, soup...',                     fooditem1: 'wrap',                     data1: 'calories per wholegrain wrap',                     imgsrc1: "img/almond.jpg",                     calories1: 567,                     fooditem2: "sandwich",                     data2: 'calories per brown slice',                     imgsrc2: "img/almond.jpg",                     calories2: 567,                     fooditem3: "chicken soup",                     data3: 'calories per 250ml bowl',                     imgsrc3: "img/almond.jpg",                     calories3: 567                 }       ];

i not want negitive numbers go below zero. understanding need use math.floor() method counteract button entering negative zone how write without compromising exists already. need controller?

i try understand expecting : don't want number count = count - {{ menu.calories1 }} negative ?

first, i'm never adding data manipulation html. call function of controller has data manipulation.

for instance : 

     <button id="minus" class="button button-icon icon round-button" ng-click="count = count - {{ menu.calories1 }} "> - </button>

will changed 

     <button id="minus" class="button button-icon icon round-button" ng-click="removecal(menu.calories1)"> - </button>

and creation of removecal function controller

$scope.removecal = function(val) {    $scope.count -= val; }

then if want number >= 0 time add if rule manage case

 $scope.removecal = function(val) {    $scope.count -= val;    if($scope.count <0)       $scope.count = 0; }

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