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March 3, 2015 16:08
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JS Bin angularjs: $watch on an array; differences between `[].push(val)` and `= [].concat([val])` // source http://jsbin.com/hikake
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| <!DOCTYPE html> | |
| <html ng-app="myApp"> | |
| <head> | |
| <meta name="description" content="angularjs: $watch on an array; differences between `[].push(val)` and `= [].concat([val])`"> | |
| <script src="http://code.jquery.com/jquery-2.1.1.min.js"></script> | |
| <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script> | |
| <meta charset="utf-8"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body ng-controller="myController"> | |
| <button type="button" ng-click="addValueByPush()">add by push</button><br /> | |
| <button type="button" ng-click="addValueByOverwrite()">add by overwrite</button> | |
| <script id="jsbin-javascript"> | |
| var app; | |
| app = angular.module('myApp', []); | |
| app.controller('myController', function($scope) { | |
| $scope.value = []; | |
| $scope.addValueByPush = function() { | |
| $scope.value.push(1); | |
| } | |
| $scope.addValueByOverwrite = function() { | |
| $scope.value = $scope.value.concat([1]); | |
| } | |
| $scope.$watch('value', function() { | |
| console.log($scope.value) | |
| }); | |
| }); | |
| </script> | |
| <script id="jsbin-source-html" type="text/html"><!DOCTYPE html> | |
| <html ng-app="myApp"> | |
| <head> | |
| <meta name="description" content="angularjs: $watch on an array; differences between `[].push(val)` and `= [].concat([val])`"> | |
| <script src="//code.jquery.com/jquery-2.1.1.min.js"><\/script> | |
| <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"><\/script> | |
| <meta charset="utf-8"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body ng-controller="myController"> | |
| <button type="button" ng-click="addValueByPush()">add by push</button><br /> | |
| <button type="button" ng-click="addValueByOverwrite()">add by overwrite</button> | |
| </body> | |
| </html></script> | |
| <script id="jsbin-source-javascript" type="text/javascript">var app; | |
| app = angular.module('myApp', []); | |
| app.controller('myController', function($scope) { | |
| $scope.value = []; | |
| $scope.addValueByPush = function() { | |
| $scope.value.push(1); | |
| } | |
| $scope.addValueByOverwrite = function() { | |
| $scope.value = $scope.value.concat([1]); | |
| } | |
| $scope.$watch('value', function() { | |
| console.log($scope.value) | |
| }); | |
| }); | |
| </script></body> | |
| </html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| var app; | |
| app = angular.module('myApp', []); | |
| app.controller('myController', function($scope) { | |
| $scope.value = []; | |
| $scope.addValueByPush = function() { | |
| $scope.value.push(1); | |
| } | |
| $scope.addValueByOverwrite = function() { | |
| $scope.value = $scope.value.concat([1]); | |
| } | |
| $scope.$watch('value', function() { | |
| console.log($scope.value) | |
| }); | |
| }); |
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Hi, is your array concat triggering the $watch ?
I need the same aproach but i can't trigger the $watch when i concat my arrays with a override