Angularjs 2向數據綁定從指令到控制器陣列的推對象

Question

我有一個在控制器中定義的數組，並使用雙向綁定將它傳遞給指令。在指令中，我試圖將對象推入該數組，但失敗了。

.controller("test", function($scope){ 
     $scope.myarr =[]; 

     $scope.$watch("myarr", function(newValue, oldValue){ 
     console.log($scope.myarr); //prints empty arr 
    },true); 
}); 

.directive('ptest', ['$compile', function($compile) { 
    var object = {value: 'changed value'}; 
    return { 
     restrict:"E" 
     scope: { 
      myarr:"=" 
     }, 
     template : "<div>{{iobj.value}}<div>", 
     link: function(scope,elem,attr){ 
     myarr.push(object) ; 
     } 
    }; 
}]); 

html 

<ptest myarr="myarr"></ptest> 

Answer 1

嘗試的scope.myarr.push(object);代替myarr.push(object)

Answer 2

爲@George李先生說嘗試scope.myarr.push(object);，也是你的指令有誤。 restrict:"E"後，你忘了把,

return { 
    restrict:"E", // forgot put ',' 
    scope: { 
     myarr:"=" 
    }, 
    template : "<div>{{iobj.value}}<div>", 

// Code goes here 
 

 
angular.module('app', []) 
 

 
.controller("test", function($scope){ 
 
    $scope.myarr =[]; 
 

 
    
 
    $scope.$watch("myarr", function(newValue, oldValue){ 
 
    console.log($scope.myarr); //prints empty arr 
 
    },true); 
 
    
 
    $scope.addItem = function(){ 
 
     var object = {value: 'changed value2'}; 
 
     $scope.myarr.push(object); 
 
    } 
 
}) 
 

 
.directive('ptest', ['$compile', function($compile) { 
 
    var object = {value: 'changed value'}; 
 
    return { 
 
    restrict:"E", 
 
    scope: { 
 
     myarr:"=" 
 
    }, 
 
    template : '<div ng-repeat="item in myarr">{{item.value}}<div>', 
 
    link: function(scope,elem,attr){ 
 
     scope.myarr.push(object) ; 
 
    } 
 
    }; 
 
}]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> 
 
<div ng-app="app" ng-controller="test"> 
 
    <ptest myarr="myarr"></ptest> 
 
    <input type="button" ng-click="addItem()" value="add"> 
 
    </div>