使用angularjs更新值的问题

我正在使用angular js，我很难弄清楚如何更新一个值。我试过了，但没有成功。我会张贴我的js文件，如果有人知道任何关于我的问题帮助将不胜感激。我遇到问题的只是updateTask。

function TodoCtrl($scope) {
  $scope.todos = [
    {text:'task1', text2:'Mow the lawn', selected:false},         
    {text:'task2', text2:'Wash the car', selected:false}
  ];
  $scope.getTotalTodos = function () {
    return $scope.todos.length;
  };

  $scope.addTask = function () {
    $scope.todos.push({text:$scope.formTodoName, text2:$scope.formTodoDescription,  selected:false});
    $scope.formTodoName = '';
    $scope.formTodoDescription = '';
  };
  $scope.removeTask = function () {
    $scope.todos = _.filter($scope.todos, function(todo){
      return !todo.selected;
    });
  };
  $scope.updateTask = function () {
    if ($scope.todos.selected:true){
      $scope.todos.put({text:$scope.formTodoName, text2:$scope.formTodoDescription, selected:false});
      $scope.formTodoText = '';
    };
  };

}

index . html

<!DOCTYPE html>
<html >
  <head>
    <meta charset="UTF-8">
    <title>Todo App</title>
    <header>Todo App</header>

    <link rel="stylesheet" href="css/reset.css">

        <link rel="stylesheet" href="css/style.css">


  </head>
  <body>
    <html ng-app>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js"></script>
    <script src="//use.edgefonts.net/vast-shadow:n4:all.js"></script>
    <script src="//use.edgefonts.net/vast-shadow:n4:all;megrim.js"></script>
  </head>
  <body>
    <div class="todo-wrapper" ng-controller="TodoCtrl">
      <h2>You have <span class="emphasis">{{getTotalTodos()}}</span> tasks</h2>
      <ul>
        <li ng-repeat="todo in todos">
          <input type="checkbox" ng-model="todo.selected"/>
          <span class="selected-{{todo.selected}}">{{todo.id}} {{todo.text}}: {{todo.text2}} {{todo.date_created}}</span>
        </li>
      </ul>
      <form>
        <input class="add-input" placeholder="task name" type="text" ng-model="formTodoName" ng-model-instant />
        <input class="add-input2" placeholder="task decription" type="text" ng-model="formTodoDescription" ng-model-instant />
        <button class="add-btn" ng-click="addTask()"><h2>Add</h2></button>
      </form>
      <form>
        <input type="text" ng-model="task.text"></input>
        <button class="update-btn" ng-click="updateTask()"><h3>Update Task</h3></button>
      <button class="clear-btn" ng-click="removeTask()">Remove Task</button>
    </div>
  </body>
</html>
    <script src='http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min.js'></script>
        <script src="js/index.js"></script>


  </body>
</html>

您提到您的todos确实从您的后端具有id属性。

$scope.todos = [
  {id: 1, text:'task1', text2:'Mow the lawn', selected:false},         
  {id: 2, text:'task2', text2:'Wash the car', selected:false}
];

然后更新其中一个，

$scope.updateTask = function (task) {
  // search $scope.todos for the item to update
  var indexOfTask;
  for(var i=0;i<$scope.todos.length;i++) {
     if($scope.todos[i].id===task.id) indexOfTask = i;
  }
  // update the todo
  $scope.todos[indexOfTask] = todo;
};

您还没有发布表单HTML，但是您需要在提交处理程序中传递正在更新的任务。

<form ...>
  ...
  <input type="text" ng-model="task.text"></input>
  <input type="submit" ng-click="updateTask(task)"></input>
</form>

编辑更新表单输入和提交按钮以传递对象:

<input class="add-input" placeholder="task name" type="text" ng-model="task.text" ng-model-instant />
<input class="add-input2" placeholder="task decription" type="text" ng-model="task.text2" ng-model-instant />
...
<button class="add-btn" ng-click="addTask(task)"><h2>Add</h2></button>

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