数据更改时角度链接未触发

时间:2015-07-18 19:49:26

标签: javascript angularjs data-binding angularjs-directive angularjs-ng-repeat

我有一个项目数组,其中每个项目都绑定到一个指令。首次构建数组时,一切都很好,但是当我将数组重置为新值时,指令的链接函数不会触发。这是HTML,其中框架数组的每个元素都包含许多项目,每个项目都绑定到我的指令,酷图表

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


 app.controller("controller", function($scope) {
$scope.frames = []
   $scope.getData = function() {
     var frames = ["adsf","qwerty"];
     alert("got new Data")
     
     $scope.frames.push(frames)
    
   }
   
 });

 app.directive('coolChart', function() {
   return {
     restrict: 'E',
     scope: {
       data: '=data'
     },
     link: function(scope, element) {
       data = data.toUpperCase();
       alert("Link called with: " + data)
     }
   }
 });
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="theapp">
  <div ng-controller="controller">
    {{frames}}asdf
    <button ng-click="getData()">run get Data</button>
    <div class="outer-frame" ng-repeat="frame in frames track by $index">
      {{frame}}
      <div class="chart-container" ng-repeat="item in frame track by $index">
        {{item}}
        <cool-chart data="item"></cool-chart>
      </div>
    </div>
  </div>
</body>

您会注意到您看到警报“获取新数据”,但未调用指令链接功能。

我在想这个错吗?这里更换数组内容的正确模式是什么,以便每个数组元素绑定的数据触发正确的更改通知?

2 个答案:

答案 0 :(得分:0)

尝试在重新分配时不要破坏对初始帧数组的引用...而是尝试将其清空并将新数据合并到其中,以便引用不会丢失

// declare empty array on scope
$scope.frames = [];
var getData = function () {
    // reset scope array
    $scope.frames.length = 0;
    // merge data into frames
    $scope.frames.concat(data); // not sure where data comes from
 };

或者,如果从角度以外的事件引入数据,则需要告诉angular使用$ apply()运行摘要

我拿出while循环因为我不明白为什么需要它

答案 1 :(得分:0)

我已经整理了一个类似于你的代码的代码片段。当你运行代码段时它似乎有效。如果可以,请以类似的方式编辑您的问题,以尝试解决问题:)

更新:现在该链接会按预期触发警报。

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


app.controller("controller", function($scope) {
  $scope.frames = []
  $scope.getData = function() {
    var frames = ["adsf", "qwerty"];
    console.log("got new Data")

    $scope.frames.push(frames)

  }

});

app.directive('coolChart', function() {
  return {
    restrict: 'E',
    scope: {
      data: '=data'
    },
    link: function(scope, element) {
      scope.data = scope.data.toUpperCase();
      alert("Link called with: " + scope.data)
    }
  }
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="theapp">
  <div ng-controller="controller">
    {{frames}}asdf
    <button ng-click="getData()">run get Data</button>
    <div class="outer-frame" ng-repeat="frame in frames track by $index">
      {{frame}}
      <div class="chart-container" ng-repeat="item in frame track by $index">
        {{item}}
        <cool-chart data="item"></cool-chart>
      </div>
    </div>
  </div>
</body>