javascript - Angular.js ng-show 和指令不起作用

Question

我有以下 html:

<div class="modal-dialog" ng-controller="modal-ctrl" ng-show="showModal" execute-on-esc>

Angular.js 应用程序:

app.controller('modal-ctrl', function($scope) {
    $scope.showModal = true;
});

app.directive('executeOnEsc', function ($document) {
    return {
        restrict: 'A',
        link: function (scope) {
            return $document.bind('keydown', function(event) {
                event.which === 27? scope.showModal = false : false;
            });
        }
    }
});

一切正常，$scope.showModal 更改为 false，但 ng-show 不响应此更改。为什么？ Console.log 显示 $scope.showModal 发生变化。 问题出在哪里？

Answer 1

return $document.bind('keydown', function(event) {
    event.which === 27? scope.showModal = false : 
});

您正在创建一个事件监听器，该监听器在 Angular 摘要周期之外执行。因此，您必须告诉 Angular 开始一个新的摘要周期才能接受更改。您可以使用scope.$apply为此:

return $document.bind('keydown', function(event) {
    scope.$apply(function(){
        event.which === 27? scope.showModal = false : 
    });
});

演示

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

app.controller('modal-ctrl', function($scope) {
  $scope.showModal = true;
});

app.directive('executeOnEsc', function($document) {
  return {
    restrict: 'A',
    link: function(scope) {
      return $document.bind('keydown', function(event) {
        scope.$apply(function() {
          event.which === 27 ? scope.showModal = false : false;
        });
      });
    }
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app">
  <div class="modal-dialog" ng-controller="modal-ctrl" ng-show="showModal" execute-on-esc>
    My Modal
  </div>
</div>