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Please take a look at the screenshot given below
As you can see in the screenshot above there are #3 watchers for a single binding.
Can anyone please elaborate why is it so?
P.S: I am using AngularJS Batarang for checking the performance.
var app = angular.module('app', []);
app.controller('appCtrl', function ($scope, $timeout) {
$scope.name = 'vikas bansal';
})<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular.min.js"></script>
<script src="app.js"></script>
</head>
<body>
<div ng-app="app" ng-controller="appCtrl">
{{name}}
</div>
</body>
</html>
342
I think Angular Batarang has a wrong counter of watchers. I checked with few different sources, and all except AngularJS Batarang show me single watcher on your code. Check out this question with function:
(function () {
var root = angular.element(document.getElementsByTagName('body'));
var watchers = [];
var f = function (element) {
angular.forEach(['$scope', '$isolateScope'], function (scopeProperty) {
if (element.data() && element.data().hasOwnProperty(scopeProperty)) {
angular.forEach(element.data()[scopeProperty].$$watchers, function (watcher) {
watchers.push(watcher);
});
}
});
angular.forEach(element.children(), function (childElement) {
f(angular.element(childElement));
});
};
f(root);
// Remove duplicate watchers
var watchersWithoutDuplicates = [];
angular.forEach(watchers, function(item) {
if(watchersWithoutDuplicates.indexOf(item) < 0) {
watchersWithoutDuplicates.push(item);
}
});
console.log(watchersWithoutDuplicates.length);
})();
And you can check Watchers extension for chrome. Both show 1 watcher.
91
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