console.log for $scope in angular js
Question
Why I'm not able to console output $scope values ? I'm trying to extract user assigned values from the pages and retrieve in controller. Eventually i would like to pass this to service so multiple controllers can access these data.
HTML
<!DOCTYPE html>
<html lang="en-us" ng-app="myApp">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta charset="UTF-8">
<link rel="stylesheet" href="css/bootstrap.min.css" />
<!-- CDN lib files -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular-animate.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/1.1.0/ui-bootstrap-tpls.min.js"></script>
<!-- custom angular script -->
<script src="js/app.js"></script>
</head>
<body>
<div class="container">
<div ng-controller="mainController">
<h1>Hello world!</h1>
<label> Please enter something</label>
<input textarea ng-model="name"></input>
<h4> This is what you entered : {{ name }} </h4>
<h4 style=color:red> now filtering: {{ lower() }}</h4>
</div>
</div>
</body>
</html>
APP.JS
var myApp = angular.module('myApp', []);
myApp.controller('mainController', ['$scope', '$filter', function($scope, $filter) {
$scope.name = 'Test ';
$scope.lower = function(){
return $filter('lowercase')($scope.name);
}
$scope.name = $scope.lower();
console.log($scope.name);
console.log($scope.lower());
}]);
Console will output values upon initializing but not after user make changes.
4 answers
solution1
7 ACCPTED 2016-02-16 23:09:25
You need to watch the scope variable:
$scope.$watch('name', function() {
console.log($scope.name);
});
More information: https://stackoverflow.com/a/15113029/5787736
solution2
3 2016-02-16 23:13:09
Just a more "functional" version. Everyone is right, you are logging the observable, not what was observed. What you want is for console.log to be called on each change to $scope , not called once (as you have it now).
$scope.$watch("name", console.log);
solution3
2 2016-02-16 23:09:33
You're logging only from the constructor. If you want to log each time something changes, consider a watch:
$scope.$watch("name", function() {
console.log($scope.name);
}
solution4
1 2016-02-16 23:11:46
Why would you expect a controller to be rerendered when a scope variable changes? You can use scope watchers or input event listeners to listen for changes.
Here's an example with a watcher:
var myApp = angular.module('myApp', []); myApp.controller('mainController', ['$scope', '$filter', function($scope, $filter) { $scope.name = 'Test '; $scope.lower = function(){ return $filter('lowercase')($scope.name); } $scope.name = $scope.lower(); console.log($scope.name); console.log($scope.lower()); $scope.$watch('name', function() { console.log($scope.name); console.log($scope.lower()); }); }]);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> <div ng-app="myApp" class="container"> <div ng-controller="mainController"> <h1>Hello world!</h1> <label>Please enter something</label> <input textarea ng-model="name" /> <h4> This is what you entered : {{ name }} </h4> <h4 style=color:red> now filtering: {{ lower() }}</h4> </div> </div>
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