如何在ng-reeat中使用ng-switch来编辑JSON API数据

如果不想将标志放在数据对象上，则需要使用单独的对象来存储它们。使用WeakMaps，您可以轻松地将数据对象或元素本身与flags对象相关联。如果你的目标是旧的浏览器，你需要找到一种类似的方法来将数据对象/或元素与标志对象相关联

JS-

let map = new WeakMap();
$scope.editing = function(item){
    return map.get(item).edit;
}
$scope.switch = function (item) {
    let flags = map.get(item);
    if (flags.edit) {
        flags.edit = false;
    } else {
        flags.edit = true;
    }
};
//Note you could combine switch and send into a single toggle function
$scope.send = function (item) {
    let flags = map.get(item);
    if (flags.edit) {
        flags.edit = false;
    } else {
        flags.edit = true;
    }
};
$scope.data = [
  {color: 'blue'},
  {color: 'green'},
  {color: 'orange'}
];
//Create an empty flags object for each data item
for(let item of $scope.data){
   map.set(item,{});
}

HTML

<tr ng-repeat="item in data" ng-switch on="editing(item)" >
    <td ng-switch-default ng-bind="item.color"></td>
    <td ng-switch-when='true'>
        <input type="text" ng-model="item.color" />
    </td>
    <td ng-switch-default><button ng-click="switch(item)">edit</button></td>
    <td ng-switch-when='true'><button ng-click="send(item)">send</button></td>
</tr>

演示

// Code goes here
var app = angular.module('myApp', []);
app.controller('MyCtrl', function($scope) {
  var map = new WeakMap();
  
  //Using fat arrow less code to write
  $scope.editing = item=>map.get(item).edit;
  
  
  //Since "switch" and "send" had similar 
  //toggling code just combined them
  //Also no need to use if statement, just use the NOT operator
  //to toggle the edit flag
  $scope.toggle = item=>{
    let flags = map.get(item);
    flags.edit = !flags.edit;
  };
  $scope.switch = item=>{
    $scope.toggle(item);
    //Do some switching? 
    //if not doing anything else just 
    //call toggle in the ng-click
  };
  $scope.send = item=>{
    $scope.toggle(item);
    //Do some sending
  };
  $scope.data = [
      {color: 'blue'},
      {color: 'green'},
      {color: 'orange'}];
      
  for(let item of $scope.data){
    map.set(item,{});
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp" ng-controller="MyCtrl">
  <table>
    <thead>
      <tr>
        <th width="180">Column</th>
        <th>Edit</th>
      </tr>
    </thead>
    <tbody>
      <tr ng-repeat="item in data" ng-switch on="editing(item)" >
        <td ng-switch-default ng-bind="item.color"></td>
        <td ng-switch-when='true'>
          <input type="text" ng-model="item.color" />
        </td>
        <td ng-switch-default><button ng-click="switch(item)">edit</button></td>
        <td ng-switch-when='true'><button ng-click="send(item)">send</button></td>
      </tr>
    </tbody>
  </table><br>
  "$scope.data" should never change after hitting edit/send since the flag is no longer on the data item object:
  <code><pre>{{data}}</pre></code>
</div>

我改为使用ng-show，但希望这能证明一种更好的方法：

http://plnkr.co/edit/63Io7k1mJcfppxBQUVef?p=preview

我使用的是ng-show，我只是在需要时隐式地将"edit"附加到对象上，因为您不需要立即将其设置为true。缺少属性将意味着它返回false。

标记：

<tbody> <tr ng-repeat="item in data"> <td ng-show="!item.edit" ng-bind="item.color"></td> <td ng-show='item.edit'> <input type="text" ng-model="item.color" /> </td> <td><button ng-click="edit(item)">{{item.edit ? "Send" : "Edit"}}</button></td> </tr> </tbody>

对于这样的情况，我总是将视图状态封装在一个指令中。这里的意思是为每一行创建一个指令，并在该指令中移动item.edit标志。

下面是一个非常天真的实现：

HTML:

<tbody>
    <tr ng-repeat="item in data" inplace-edit="item" send-callback="send(item)"></tr>
</tbody>

JS:

app.directive('inplaceEdit', function() {
  return {
    restrict: 'A',
    template:
      '<td ng-if="!inEditMode" ng-bind="item.color"></td>' +
      '<td ng-if="inEditMode">' +
        '<input type="text" ng-model="item.color" />' +
      '</td>' +
      '<td ng-if="!inEditMode"><button ng-click="toEditMode()">edit</button></td>' +
      '<td ng-if="inEditMode"><button ng-click="send()">send</button></td>',
    scope: {
      item: '=inplaceEdit',
      sendCallback: '&'
    },
    link: function(scope) {
      scope.inEditMode = false;
      scope.toEditMode = function() {
        scope.inEditMode = true;
      };
      scope.send = function() {
        scope.sendCallback({item: scope.item});
        scope.inEditMode = false;
      };
    }
  };
});

参见分叉plunk：http://plnkr.co/edit/BS6a866aiy3BA9MX0Flx?p=preview

我想补充的是：

1. controllerAs、bindToController
2. 一些用于回滚/撤消更改的代码（即编辑模式下的"取消"按钮）
3. 使用Angular 1.5.x和单向绑定：item: '>inplaceEdit'或将inplace-edit指令与ng模型集成