Question

我正在尝试访问link中的范围变量，但它们显示为未定义

/** @ngInject */
function tablePagination() {
  return {
    restrict: 'E',
    template: require('./tablePagination.html'),
    scope: {
      currentPage: '=',
      totalPages: '=',
      totalCount: '=',
      perPage: '='
    },
    link: function (scope) {
      console.log(scope.currentPage, scope) // scope.currentPage is undefined
    }
  }
}

// controller for authlogin
module.exports = tablePagination

我还尝试使用@而不是=，并将绑定更改为使用{{}}，但仍未定义。我可以使用$observe但我想一次获取多个属性的值来进行一些计算。什么是最好的方法呢？

HTML代码

 <table-pagination
    current-page="$ctrl.tableMeta.currentPage"
    total-count="$ctrl.tableMeta.totalCount"
    total-pages="$ctrl.tableMeta.totalPages"
    per-page="$ctrl.tableMeta.perPage"></table-pagination>

更新：我想知道是否因为该指令未从$ctrl.tableMeta获取来自API / Async的更新值

解决方案！：哦我发现我的错误是我需要使用$watch否则它会获得默认未定义的旧值，因为它尚未通过API设置为异步

scope.$watch('currentPage', () => {
  scope.start = (scope.currentPage - 1) * scope.perPage + 1
  scope.end = Math.min(scope.currentPage * scope.perPage, scope.totalCount)
})

Answer 1

这只是一个例子，我希望它能清除一些事情。

<强> gridPagination.html

<label>current Page:</label><span>{{ currentPage }}</span>
<br>
<label>Total Pages:</label> {{ totalPages }}

<强> app.js

var app = angular.module("myApp", []);

<强> mainController.js

app.controller('mainController', ['$scope', function($scope) {
  $scope.title = 'My Grid';
}]);

<强> gridDirective.js

app.directive('grid', gridPagination);

function gridPagination() {
  return {
    restrict: 'E',
    scope: {
      currentPage: '=',
      totalPages: '=',
      totalCount: '=',
      perPage: '='
    },
    templateUrl: 'gridPagination.html',
    link: function(scope, element, attrs) {
      console.log(scope.currentPage);
      console.log(scope.totalPages);
      console.log(scope.totalCount);
      console.log(scope.perPage);
    }
  };
};

<强>的index.html

<html>
  <head>
    <link rel="stylesheet" href="main.css">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.0/angular.js"></script>
  </head>   
  <body ng-app="myApp">
    <div ng-controller="mainController">
        <grid current-page="3" total-pages= "30" total-count="10" per-page="2"></grid>
    </div>        
    <script src="app.js"></script>
    <script src="mainController.js"></script>
    <script src="gridDirective.js"></script>
  </body>    
</html>

plunker

Angular指令范围变量undefined

1 个答案: