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javascript – 这个场景是$scope.$apply()调用吗？

2019-06-11 23:24:41 作者：互联网

AngularJS(和坦率地说,JavaScript)的新功能,但是从我收集到的内容中,只有当更改发生在angular的雷达之外时,才需要显式调用$scope.$apply().下面的代码(粘贴自this plunker)让我觉得不需要调用它的情况,但这是我能让它工作的唯一方法.我应该采取不同的方法吗？

index.html的：

<html ng-app="repro">
  <head> 
    ...
  </head>
  <body class="container" ng-controller="pageController">
    <table class="table table-hover table-bordered">
        <tr class="table-header-row">
          <td class="table-header">Name</td>
        </tr>
        <tr class="site-list-row" ng-repeat="link in siteList">
          <td>{{link.name}}
            <button class="btn btn-danger btn-xs action-button" ng-click="delete($index)">
              <span class="glyphicon glyphicon-remove"></span>
            </button>
          </td>
        </tr>
    </table>
  </body>
</html>

的script.js：

var repro = angular.module('repro', []);

var DataStore = repro.service('DataStore', function() {
  var siteList = [];

  this.getSiteList = function(callback) {
    siteList = [ 
      { name: 'One'}, 
      { name: 'Two'}, 
      { name: 'Three'}];

    // Simulate the async delay
    setTimeout(function() { callback(siteList); }, 2000);
  }

  this.deleteSite = function(index) {
    if (siteList.length > index) {
      siteList.splice(index, 1);
    }
  };
});

repro.controller('pageController', ['$scope', 'DataStore', function($scope, DataStore) {
  DataStore.getSiteList(function(list) {

    $scope.siteList = list; // This doesn't work
    //$scope.$apply(function() { $scope.siteList = list; }); // This works

  });

  $scope.delete = function(index) {
    DataStore.deleteSite(index);
  };
}]);

解决方法:

setTimeout(function() { callback(siteList); }, 2000);

此行将带您进入Anglar的摘要循环之外.您可以简单地将setTimeout替换为Angular的$timeout包装器(您可以将它注入到DataStore服务中),并且您不需要$scope.$apply.

标签：javascript,angularjs,angularjs-service,angularjs-scope,angular-digest
来源： https://codeday.me/bug/20190611/1221661.html