angular.js - angularjs input标签只能单向传递数据的问题

Question

我的界面

 <ion-view title = "{{roomName}}" style = "height:90%;margin-top: 45px "  ng-init = "init()">
            <ion-pane>
            <ion-content zooming = "true"  class = "no-header">
                <ion-list>
                    <ion-item class="item item-input-inset">
                        <label class="item-input-wrapper">
                            <input type="text" placeholder="Your Message To Send" ng-model = "myMessage">
                        </label>
                        <button class="button button-small" ng-click = "sendMyMessage()">
                            发送
                        </button>
                    </ion-item>
                </ion-list>
            </ion-content>
            </ion-pane>

            <ion-pane style = "margin-top: 55px">
            <ion-content zooming = "true" class = "no-header" style = "margin-bottom: 50px">
                <ion-list>
                    <ion-item class = "item item-avatar-left my-item"
                             collection-repeat = "message in messages"
                             collection-item-width="'100%'"
                             collection-item-height="75">
                        <img ng-src="{{message.user.avatarUrl}}">
                        <h2>{{message.user.name}}:</h2>
                        <p>{{message.content}}</p>

                    </ion-item>
                </ion-list>

            </ion-content>
        </ion-pane>
        </ion-view>

我的controller

atMoon.controller('roomCtrl',['$scope','myService', function ($scope, myService) {


    $scope.sendMyMessage = function () {
        console.log($scope.myMessage)
        myService.sendMyMessage($scope, $scope.myMessage)
    }
    $scope.init = function () {
        myService.getMessages($scope);
    }
}])

打印的$scope.myMessage一直是undefine,如果我在controller中写上$scope.myMessage = "xxxx"能再界面中显示，所以数据只能从模型到视图，不能从视图到模型，求大神解答万分感谢

Answer 1

I suspect that you have been fooled by the prototypal inheritance of scope

Like ion-content 这些指令都是有各自的 scope 的，然后你在视图里写上 ng-model="myMessage" ，其实你在输入框填入的内容是放到了 ion-item 的 scope 上了，而你的 roomCtrl 的 scope 里的 myMessage 依旧是 undefined ；而当你在控制器里给 myMessage 赋值完了以后，由于 ion-item 的 scope 上还没有 myMessage 属性，所以就会从原型链上找，进而找到了 roomCtrl 的 scope 上的 myMessage .

This is my go-to solution:

$scope.ctrlScope = $scope

<input ng-model="ctrlScope.myMessage" />

Answer 2

I also encountered this problem. It seems to be a problem with angular.js-1.3.0 version. It has not appeared in lower versions. I have done a test experiment and put myMessage into an Object as follows. It can pass the test. I don’t know why. (Maybe the new version of Angular has optimized watches, and too many watches will affect efficiency):

Set in controller
$scope.Messages={myMessage:""}

 $scope.sendMyMessage = function () {
        console.log($scope.Messages.myMessage);
    }

<input ng-model="Messages.myMessage" />


另外我用angular.js正在开发webapp，可以交流下，http://php.xlanlab.com/webapp/mobile-angular-ui-master/my/index.html