下拉到js代码的gettig值

时间:2017-06-02 11:26:55

标签: javascript angularjs

我正在研究angularjs应用程序。我希望角度控制器中的下拉列表中的选定值。请建议。下面是代码。

<select>
    <option value="red">Red</option>
    <option value="blue">Blue</option>
</select>

js code:

myApp.controller('myController', function ($rootScope,$scope) {
//business logic
$rootScope.selectedValue='red';//I want the value of the dropdown selected, by default it is first option red
})

上面的控制器在页面加载时调用,如何将从下拉列表中选择的值分配给控制器的$ rootScope变量。

4 个答案:

答案 0 :(得分:2)

<select ng-model="selectedValue">

http://jsfiddle.net/fufpxyub/

并且,建议不要在rootscope中使用原始道具。看到 updated fiddle如果可能的话,请避免使用rootcope。,只使用$ scope of controller。

答案 1 :(得分:0)

您应该将ng-model添加到select代码。

示例:

var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
  $scope.showPopup=function(){
    alert($scope.MyData);
  };
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp" ng-controller="myCtrl">
  <select class="form-control" ng-model="MyData">
    <option disabled selected value>-- select an option --</option>
    <option value="red">Red</option>
    <option value="blue">Blue</option>
  </select>
  <a class="btn btn-primary add-contract-button pull-right" ng-click="showPopup()">Click to show selected value</a>
</div>

答案 2 :(得分:0)

在您的代码中尝试此操作。

在HTML中,更改您的选择,如下所示

<select ng-model="colorSelected" ng-change="selectColor(colorSelected)">
 <option value="red">Red</option>
 <option value="blue">Blue</option>
</select>

在JS或Controller中,按如下方式访问它,

myApp.controller('myController', function ($rootScope,$scope) {
   $rootScope.selectedValue=$scope.colorSelected;
   $scope.selectColor = function(colorSelected){
        // use the colorSelected and set your alerts or basically handle anything
   }
})

答案 3 :(得分:0)

在HTML中编写此代码:

<div ng-controller="myController">
<select ng-model="selectedValue">
    <option value="red">Red</option>
    <option value="blue">Blue</option>
</select>
</div>

在JS中:

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

myApp.controller('myController', function ($rootScope,$scope) {
//business logic
$rootScope.selectedValue='red';//I want the value of the dropdown selected, by default it is first option red
})