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jason chan
31,009 PointsWhy is my angular function concatenating instead of adding?
html
<!DOCTYPE html>
<html ng-app="myFirstApp">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="">
<title>Angular Training</title>
<link rel="shortcut icon" href="">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
<style>body{padding-top:50px;}.starter-template{padding:40px 15px;text-align:center;}</style>
<!--[if IE]>
<script src="https://cdn.jsdelivr.net/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://cdn.jsdelivr.net/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Angular Course</a>
</div>
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#about">About</a></li>
<li><a href="#contact">Contact</a></li>
</ul>
</div><!--.nav-collapse -->
</div>
</nav>
<div class="container">
<div class="starter-template" ng-controller='myController'>
<div class="input-group" >
<label for="firstName">Integer1
<input type="text" name="name" ng-model="color1">
</label>
</div>
<div class="input-group">
<label for="lastName">Interger2
<input type="text" name="name" ng-model="color2">
</label>
</div>
<h1>Hello, there {{color1}} * {{color2}} = {{printName()}}</h1>
<br>
<h2>This is plus {{add()}}</h2>
<h2>This is subtract {{subtract()}}</h2>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<script src='https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js'></script>
<script src="app.js"></script>
</body>
</html>
app.js
var myApp = angular.module('myFirstApp', []);
myApp.controller('myController', function($scope) {
$scope.color1 = 5;
$scope.color2 = 6;
$scope.printName = function() {
return $scope.color1 * $scope.color2;
}
$scope.add = function() {
return $scope.color1 + $scope.color2;
}
$scope.subtract = function () {
return $scope.color1 - $scope.color2;
}
} );
subtract works? How come when I type in numbers for addition function it concatinates instead of adds? Do i have to parsInt() ?
4 Answers
Marc Schultz
23,356 PointsYes, you need parseInt() or parseFloat() because there are no strings in this expression.
How about this:
$scope.color1 + '' + $scope.color2;
jason chan
31,009 PointsThe answer was to wrap the addition function in parenthesis. Just like math. Please excuse my dear aunt sally. LOLs.
var myApp = angular.module('myFirstApp', []);
myApp.controller('myController', function($scope) {
$scope.color1 = 5;
$scope.color2 = 6;
$scope.printName = function() {
return $scope.color1 * $scope.color2;
}
$scope.add = function() {
return ($scope.color1 + $scope.color2);
}
$scope.subtract = function () {
return $scope.color1 - $scope.color2;
}
} );
jason chan
31,009 Pointsi need help again it's doing it again in NG-CLICK oh man!!!!
<!DOCTYPE html>
<html ng-app="myFirstApp">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="">
<title>Angular Training</title>
<link rel="shortcut icon" href="">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
<style>body{padding-top:50px;}.starter-template{padding:40px 15px;text-align:center;}</style>
<!--[if IE]>
<script src="https://cdn.jsdelivr.net/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://cdn.jsdelivr.net/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Angular Course</a>
</div>
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#about">About</a></li>
<li><a href="#contact">Contact</a></li>
</ul>
</div><!--.nav-collapse -->
</div>
</nav>
<div class="container">
<div class="starter-template" ng-controller='myController'>
<div class="input-group" >
<label for="firstName">Integer1
<input type="text" name="name" ng-model="color1">
</label>
</div>
<div class="input-group">
<label for="lastName">Interger2
<input type="text" name="name" ng-model="color2">
</label>
</div>
<h1>Hello, there {{color1}} * {{color2}} = {{printName()}}</h1>
<br>
<h2>This is plus {{add()}}</h2>
<h2>This is subtract {{subtract()}}</h2>
<h2>This is divide: {{divide()}}</h2> <br>
<button ng-click="sayHello()">Greet</button>
{{hi}}
<br>
<button ng-click="clickPlus()">Add Please</button>
<button ng-click="why = why + 1">++</button>
{{why}}
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<script src='https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js'></script>
<script src="app.js"></script>
</body>
</html>
var myApp = angular.module('myFirstApp', []);
myApp.controller('myController', function($scope) {
$scope.color1 = 5;
$scope.color2 = 6;
$scope.why = 0;
$scope.printName = function() {
return $scope.color1 * $scope.color2;
}
$scope.add = function() {
return ($scope.color1 + $scope.color2);
}
$scope.subtract = function () {
return $scope.color1 - $scope.color2;
}
$scope.divide = function () {
return ($scope.color1 / $scope.color2).toFixed(2);
}
$scope.sayHello = function() {
$scope.hi = 'Hello ' + $scope.color1 + '!';
}
$scope.clickPlus = function() {
$scope.why = $scope.color1;
}
} );
Whenever I type in a new number in the form it concats instead of adds. NG CLICK. ughhh.
jason chan
31,009 Pointsvar myApp = angular.module('myFirstApp', []);
myApp.controller('myController', function($scope) {
$scope.color1 = 5;
$scope.color2 = 6;
$scope.why = 0;
$scope.printName = function() {
return $scope.color1 * $scope.color2;
}
$scope.add = function() {
return ($scope.color1 + $scope.color2);
}
$scope.subtract = function () {
return $scope.color1 - $scope.color2;
}
$scope.divide = function () {
return ($scope.color1 / $scope.color2).toFixed(2);
}
$scope.sayHello = function() {
$scope.hi = 'Hello ' + $scope.color1 + '!';
}
$scope.clickPlus = function() {
// this +(string) converts string into number
$scope.why = +($scope.color1);
}
} );
//shorthand for string conversion to int
+('5') // converts to 5
WOOOHOOO! fixed me bug