我在理解属性值在AngularJS指令中的工作方式时遇到了一些麻烦。无论我尝试什么,当我尝试在指令控制器中使用它们时,文字属性值都会显示为undefined
。
在我的HTML中说我引用了这样的指令:
<div ng-controller="MyCtrl">
<my-directive reference-attr='referenceVal' literal-attr='literalVal'></my-directive>
</div>
referenceVal
和literalVal
都在我的控制器中定义,如下所示:
var myApp = angular.module('myApp', []);
function MyCtrl($scope) {
$scope.referenceVal = 'This was passed by reference';
$scope.literalVal = 'This was also passed by reference, but should have been literal';
}
我试着在我的指令中选择它们:
myApp.directive("myDirective", function () {
return {
restrict: "E",
replace: true,
scope: {
referenceAttr: "=",
literalAttr: "@"
},
template: '<div><p>Reference:{{referenceAttr}}</p><p>Literal:{{literalAttr}}</p></div>',
controller: function ($scope) {
alert("ref: " + $scope.referenceAttr + ", lit: " + $scope.literalAttr);
}
};
});
输出看起来很好:
Reference: This was passed by reference
Literal: literalVal
但警告信息是废话:
ref: This was passed by reference, lit: undefined
您可以使用this JSFiddle
自行试用为什么literalAttr
在指令范围内未定义?
答案 0 :(得分:3)
这是Angular最早版本的问题,例如:小提琴中使用的1.0.1。最新版本表现出预期的行为。