无法编写基本控制器AngularJS答案

【问题标题】：Cannot write a basic controller AngularJS无法编写基本控制器AngularJS
【发布时间】：2016-02-25 11:10:41
【问题描述】：

如果我的问题太基本，请原谅我。我正在学习 AngularJS 的控制器。

这是项目结构。

这是我的html：

<!doctype html>
<html ng-app>

<head>
    <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.3/angular.min.js"></script>
    <script src="js/controllers.js" />
</head>

<body>

<div ng-controller="numberController">
<input type = "text" ng-model = "number.number1" placeholder = "Enter a number here">

<input type = "text" ng-model = "number.number2" placeholder = "Enter another number here">
{{number.number1}} + {{number.number2}} = {{number.sumIt()}}

</div>
</body>
</html>

这是我的控制器：

function numberController($scope) {
    $scope.number = {
        number1: 0,
        number2: 0,

        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    };
}

网页甚至没有加载。

我哪里出错了？

编辑：

我得到的错误：我得到这个错误：https://docs.angularjs.org/error/$injector/modulerr?p0=sa-app&p1=Error:%20%5B$injector:nomod%5D%20http:%2F%2Ferrors.angularjs。 org%2F1.3.3%2F$injector%2Fnomod%3Fp0%3Dsa-app%0A%20%20%20%20at%20Error%20（本机）%0A%20%20%20%20at%20https:%2F% 2Fajax.googleapis.com%2Fajax%2Flibs%2Fangularjs%2F1.3.3%2Fangular.min.js:6:416%0A%20%20%20%20at%20https:%2F%2Fajax.googleapis.com%2Fajax%2Flibs %2Fangularjs%2F1.3.3%2Fangular.min.js:21:366%0A%20%20%20%20at%20a%20(https:%2F%2Fajax.googleapis.com%2Fajax%2Flibs%2Fangularjs%2F1. 3.3%2Fangular.min.js:21:7)%0A%20%20%20%20at%20https:%2F%2Fajax.googleapis.com%2Fajax%2Flibs%2Fangularjs%2F1.3.3%2Fangular.min.js: 21:250%0A%20%20%20%20at%20https:%2F%2Fajax.googleapis.com%2Fajax%2Flibs%2Fangularjs%2F1.3.3%2Fangular.min.js:35:105%0A%20%20 %20%20at%20r%20(https:%2F%2Fajax.googleapis.com%2Fajax%2Flibs%2Fangularjs%2F1.3.3%2Fangular.min.js:7:302)%0A%20%20%20%20at %20g%20(https:%2F%2Fajax.googleapis.com%2Fajax%2Flibs%2Fangularjs%2F1.3.3%2Fangular.min.js:34 :456)%0A%20%20%20%20at%20Lb%20(https:%2F%2Fajax.googleapis.com%2Fajax%2Flibs%2Fangularjs%2F1.3.3%2Fangular.min.js:38:184)% 0A%20%20%20%20at%20d%20(https:%2F%2Fajax.googleapis.com%2Fajax%2Flibs%2Fangularjs%2F1.3.3%2Fangular.min.js:17:381

我更新的控制器：

var saApp = angular.module("saApp", []);

saApp.controller('numberController', function($scope) {
    $scope.number = {
        number1: 0,
        number2: 0,
        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) +      parseInt(numberObject.number2);
        }
    };
});

我更新的 HTML：

<!doctype html>
<html>

<head>
    <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.3/angular.min.js"></script>
    <script src="js/controllers.js" />
</head>

<body>

<div ng-app = "saApp" ng-controller="numberController">
<input type = "text" ng-model = "number.number1" placeholder = "Enter a number here">

<input type = "text" ng-model = "number.number2" placeholder = "Enter another number here">
{{number.number1}} + {{number.number2}} = {{number.sumIt()}}

</div>
</body>
</html>

【问题讨论】：

你的控制台有什么？
你需要 ng-app...控制器必须是 ng-app 的一部分
没有控制台。我只有一个网络浏览器。
您的网络浏览器有一个控制台...
我已经从控制台添加了错误。

标签： javascript angularjs angularjs-controller

【解决方案1】：

您需要先将您的应用程序与您的 JS 文件链接起来。将您的标签更改为并更改您的 controllers.js

<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.number = {
        number1: 0,
        number2: 0,
        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) +      parseInt(numberObject.number2);
        }
    };
});
</script>

如果您右键单击鼠标然后单击 Inspect 元素，也会找到控制台。

【讨论】：

我已经更新了。（请参阅我更新的问题。）但它仍然不起作用。
尝试清除缓存或在隐身模式下运行它。如果它仍然不起作用，可能需要一个服务器尝试使用 XAMP/WAMP 等运行它

【解决方案2】：

嗨，这样写你的程序：-

<!doctype html>
<html>

<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.5/angular.min.js"></script>
<script>
 angular.module("myapp", [])
    .controller("NumberController", function($scope, $http) {
       $scope.number = {
        number1: 0,
        number2: 0,
        sum:0,
        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            this.sum = parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    };
    } );
</script>
</head>
<body ng-app="myapp"> 
<div ng-controller="NumberController">
<input type = "text" ng-model = "number.number1" placeholder = "Enter a number here"/>

<input type = "text" ng-model = "number.number2" placeholder = "Enter another number here"/>
<input type = "button" ng-click="number.sumIt()" value="Sum"/>
sum is {{number.sum}}

</div>
</body>
</html>

【讨论】：

【解决方案3】：

问题：您正在使用不推荐使用的控制器声明方法。至少从 1.3 版开始，您不能使用 function <controller> 声明控制器。

解决办法：

1：声明应用程序 - var app = angular.module('myApp', []);

2：附加控制器

app.controller('numberController', ['$scope', function($scope) {

$scope.number = {
        number1: 0,
        number2: 0,

        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    };
}]);

我做了一个jsfiddle to demonstrate.

【讨论】：

【解决方案4】：

你必须定义 angular.module

<html ng-app="myApp">

然后像下面这样编写你的控制器

var myApp = angular.module('myApp',[]);

myApp.controller('numberController', ['$scope', function($scope) {
   //Your controller code here
}]);

您可以检查工作代码笔Here

这里有用的链接
1 . Angular docs
2 . TutorialsPoint angular js

【讨论】：

你也可以查看链接
如果我将脚本移动到 html 文件中的脚本标签，我可以让它工作。我不知道为什么会这样。

【解决方案5】：

用你的代码不清楚你定义的app模块。来自角度文档

// app.js
    (function(angular) {
        angular.module('ngAppDemo', []).controller('NumberController', function($scope){
            $scope.number = {
                number1: 0,
                number2: 0,

                sumIt: function() {
                    var numberObject;
                    numberObject = $scope.number;
                    return parseInt(numberObject.number1) + parseInt(numberObject.number2);
                }
            };
        });
    })(window.angular);

请注意，您没有使用角度控制器的命名约定，控制器名称以大写字母开头，而 js 函数以小写字母开头（函数 numberController() - ng-controller="NumberController"）

最后在html或body上插入ng-app，在div上插入controller

<body ng-app="ngAppDemo">
    <div ng-controller="numberController">

【讨论】：

【解决方案6】：

var myApp = angular.module('myApp',[]);

myApp.controller('numberqcontroller',  function($scope) {
   //$scope.number ={};
  $scope.number = {
        number1: 10,
        number2: 0,

        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    };
  
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<!doctype html>
<html >

<head>
   
</head>

<body ng-app="myApp">

<div ng-controller="numberqcontroller">
<input type = "text" ng-model = "number.number1" placeholder = "Enter a number here">

<input type = "text" ng-model = "number.number2" placeholder = "Enter another number here">
{{number.number1}} + {{number.number2}} = {{number.sumIt()}}


</div>
</body>
</html>

【讨论】：

【解决方案7】：

我修改了您的代码，它使用相同的目录结构。这是js文件：

var app = angular.module('myApp', []);
app.controller('numberController', function($scope) {

        $scope.number = {
        number1: 0,
        number2: 0,

        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    }; 

});

和html：

<!DOCTYPE html>
<html ng-app="myApp">

   <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
   <script src="js/controllers.js" > </script>

<body>
    <div ng-controller="numberController">

       <input type = "text" ng-model = "number.number1" placeholder = "Enter a number here">

       <input type = "text" ng-model = "number.number2" placeholder = "Enter another number here">

        {{number.number1}} + {{number.number2}} = {{number.sumIt()}}

    </div>

</body>
</html>

【讨论】：

【解决方案8】：

这个怎么样：

<!DOCTYPE html>
<html ng-app="myApp">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

  <div ng-controller="numberController as ctrl">
    <input type="number" ng-model="ctrl.number1" placeholder="Enter a number here">
    <br>
    <input type="number" ng-model="ctrl.number2" placeholder = "Enter another number here">
    <br>
    <div ng-if="ctrl.number1 && ctrl.number2">
      {{ctrl.number1}} + {{ctrl.number2}} = {{ctrl.sum(ctrl.number1, ctrl.number2)}}
    </div>
  </div>

</body>
</html>

使用 Javascript：

var myApp = angular.module('myApp',[]);

myApp.controller('numberController', function() {
  var vm = this;
  vm.number1 = null;
  vm.number2 = null;
  vm.sum = function(num1, num2) {
    return num1 + num2;
  };
});

JS Bin example

建议使用“controller as”结构。您还应该考虑使用指令（或组件，如果您可以升级到 AngularJs 1.5）而不是使用 ng-controller。

【讨论】：

【解决方案9】：

只需在您的控制器中执行此操作

var app = angular.module('myapp', []);

app.controller('numberController', function($scope) {
    $scope.number = {
        number1 : 0,
        number2 : 0,
        sumIt : function() {
            //no need to copy $scope.number to another variable just simply use like this
            return parseInt($scope.number.number1) + parseInt($scope.number.number2);
        }
    }
});

这里是html代码

<body  ng-app="myapp">
    <div ng-controller="numberController">
    <input type = "text" ng-model = "number.number1" placeholder = "Enter a number here"/>
    <br /><br />
    <input type = "text" ng-model = "number.number2" placeholder = "Enter another number here"/>
    <br /><br />
     <!-  {{number.number1}} + {{number.number2}} = {{number.sumIt()}}  no need to do this just simply call the sumIt function like below->
     Total = {{number.sumIt()}}
    </div>
</body>

最后的输出

Output

【讨论】：