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My interface

 <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()">
                            發(fā)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>

My 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);
    }
}])

The printed $scope.myMessage is always undefine. If I write $scope.myMessage = "xxxx" in the controller, it can be displayed in the interface, so the data can only go from the model to the view, not from the view to the model. Please Thank you very much for the answer