AngularJS ng-bind 函数

Question

我想为附件部分显示 table 格式。我有查找和结果数据。两者都有一个共同的列 attachmentTypeId。我想根据 id 显示附件类别描述。在 ng-bind 我尝试了一次尝试，但没有成功。

我正在使用 ng-bind 中的函数，希望该方法有误，希望有替代方法。

attachmentLookup包含attachmentDesc、attachmentTypeId

  $scope.attachmentLookup = [{
    "attachmentDesc": "Category One",
    "attachmentTypeId": "1"
  }, {
    "attachmentDesc": "Category Two",
    "attachmentTypeId": "2"
  }, {
    "attachmentDesc": "Category Three",
    "attachmentTypeId": "3"
  }, {
    "attachmentDesc": "Category Four",
    "attachmentTypeId": "4"
  }, {
    "attachmentDesc": "Category Five",
    "attachmentTypeId": "5"
  }];

数据库中的 attachmentDetails 数据为，

  $scope.attachmentDetails = [{
    "attachmentId": "001",
    "fileName": "File Name 001",
    "attachmentTypeId": "1"
  }, {
    "attachmentId": "003",
    "fileName": "File Name 003",
    "attachmentTypeId": "2"
  }, {
    "attachmentId": "005",
    "fileName": "File Name 005",
    "attachmentTypeId": "3"
  }, {
    "attachmentId": "007",
    "fileName": "File Name 007",
    "attachmentTypeId": "1"
  }, {
    "attachmentId": "009",
    "fileName": "File Name 009",
    "attachmentTypeId": "2"
  }, {
    "attachmentId": "011",
    "fileName": "File Name 011",
    "attachmentTypeId": "3"
  }];

HTML代码为，

<table>
  <thead>
    <tr>
      <th>File Name</th>
      <th>|</th>
      <th>Category</th>
    </tr>
  </thead>
  <tbody>
    <tr ng-repeat="attachment in attachmentDetails">
      <td> <span ng-bind="attachment.fileName"></span>
      </td>
      <td>|</td>
      <td> <span ng-bind="getCatgoryName(attachment.attachmentTypeId)"></span>
      </td>
    </tr>
  </tbody>
</table>

来自控制器的 getCatgoryName 代码是，

$scope.getCatgoryName = function (attachmentTypeId) {
    angular.forEach($scope.attachmentLookup, function (attachemnt) {
        if (attachemnt.attachmentTypeId === attachmentTypeId)
            return attachemnt.attachmentDesc;
    });
};

示例 Plunker：http://plnkr.co/edit/dZy5gW4q9CxWF2NszXYc

Answer 1

括号被脏检查，因此函数将在每个 $digest.

被调用

这个 ng-bind 是一个指令，它将对传递给 ng-bind 的内容使用观察器。

因此，ng-bind 仅在传递的变量或值确实发生变化时适用。

使用函数时，您不会传递变量，因此它不会在每个 $digest.

时触发

因此，最好在函数调用中使用括号。

我在这里更新了 plunker：http://plnkr.co/edit/LHC2IZ0Qk9LOOYsjrjaf?p=preview

我在这里更改了HTML：

<tr ng-repeat="a in attachmentDetails">
    <td> <span>{{a.fileName}}</span></td>
    <td>|</td>
    <td> {{ getCatgoryName(a.attachmentTypeId) }}</td>
</tr>

函数也修改了：

  $scope.getCatgoryName = function(attachmentTypeId) {
    var desc = "";
    angular.forEach($scope.attachmentLookup, function(attachemnt) {
      if (parseInt(attachemnt.attachmentTypeId) == attachmentTypeId)
        desc = attachemnt.attachmentDesc;
    });

    return desc;
  };

Answer 2

做同样事情的另一种方法如下：

<tr ng-repeat="delivery in deliveries">
<td>{{delivery.pickup}}</td>
<td>{{delivery.destination}}</td>
<td>{{getVehicleDescription(delivery) || (delivery.isVehicleDescription ? delivery.modelType : delivery.vehicleType)}}</td></tr>

controller函数也修改成这样：

$scope.getVehicleDescription = function(delivery){
        $scope.roads.map(function(road){
            if(road.modelTypeID == delivery.vehicleType && !delivery.isVehicleDescription){
                delivery.modelType = road.modelType;
                delivery.isVehicleDescription = true;
            }
        })
    };

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