AngularJS-Bootstrap TypeAhead中的错误：TypeError：无法读取未定义的属性“ length”

Pramod Karandikar 发表于 Dev

普拉莫德·卡兰迪卡（Pramod Karandikar）

尝试从AngularUI-Bootstrap实现AngularJS Typeahead时出现以下错误：（我只是在调用一个Servlet，以JSON格式返回结果）

TypeError: Cannot read property 'length' of undefined
    at http://angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.11.0.js:3553:24
    at wrappedCallback (http://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.js:10930:81)
    at wrappedCallback (http://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.js:10930:81)
    at http://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.js:11016:26
    at Scope.$eval (http://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.js:11936:28)
    at Scope.$digest (http://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.js:11762:31)
    at Scope.$apply (http://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.js:12042:24)

的HTML

<h4>Users from local service</h4>
    <pre>Model: {{userList | json}}</pre>
    <input type="text" ng-model="userList" placeholder="Users loaded from local database" 
    typeahead="username for username in fetchUsers($viewValue)" 
    typeahead-loading="loadingUsers" class="form-control">
    <i ng-show="loadingUsers" class="glyphicon glyphicon-refresh"></i>

$scope.fetchUsers = function(val) {
        console.log("Entered fetchUsers function");
        $http.get("http://localhost:8080/TestWeb/users", {
            params : {
                username : val
            }
        }).then(function(res) {
            var users = [];
            angular.forEach(res.data, function(item) {
                users.push(item.UserName);
            });
            return users;
        });
    };

Servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        UserUtil userUtil = new UserUtil();
        List userList = userUtil.fetchUsers();
        Iterator userIterator = userList.iterator();

        JSONArray users = new JSONArray();


        while(userIterator.hasNext()) {
            UserDetails userDetails = (UserDetails)userIterator.next();

            JSONObject jo =  new JSONObject();
            jo.put("UserID", userDetails.getUserId());
            jo.put("UserName", userDetails.getUserName());
            jo.put("UserDescription", userDetails.getDescription());

            users.add(jo);
        }

        response.setContentType("application/json");
        response.getWriter().write(users.toString());


    }

servlet的响应 在此处输入图片说明

我提到了以下问题：

但是，我仍然无法弄清分辨率。servlet本身的响应是否存在问题？或者是别的什么？

毛里卡

在再次查看代码后，我注意到了什么地方不对，您必须在此处返回$ http promise，return在$ http之前进行通知

$scope.fetchUsers = function(val) {
        console.log("Entered fetchUsers function");
        return $http.get("http://localhost:8080/TestWeb/users", {
            params : {
                username : val
            }
        }).then(function(res) {
            var users = [];
            angular.forEach(res.data, function(item) {
                users.push(item.UserName);
            });
            return users;
        });
    };

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