在选定的 ng-option 更改时获取值 [英] Get value when selected ng-option changes

问题描述

我的 .html 页面中有一个下拉列表，

下拉列表:

<select ng-model="blisterPackTemplateSelected" data-ng-options="blisterPackTemplate 作为泡罩包装模板.在泡罩包装模板中泡罩包装模板的名称"><option value="">选择账户</option></选择>

我想在用户选择一个值时执行一个操作.所以在我的控制器中我做了:

控制器:

$scope.$watch('blisterPackTemplateSelected', function() {警报('改变')；console.log($scope.blisterPackTemplateSelected);});

但是更改下拉列表中的值不会触发代码:$scope.$watch('blisterPackTemplateSelected', function()

结果我尝试了另一种方法:ng_change = 'changedValue()' on the select tag

和

功能:

$scope.changedValue = function() {console.log($scope.blisterPackTemplateSelected);}

但是 blisterPackTemplateSelected 存储在子作用域中.我读到父级无法访问子级作用域.

当下拉列表中的选定值发生变化时，执行某些操作的正确/最佳方法是什么?如果是方法 1，我的代码有什么问题?

解决方案

正如 Artyom 所说，你需要使用 ngChange 并将 ngModel 对象作为参数传递给 ngChange 函数

示例:

<div ng-app="App" ><div ng-controller="ctrl"><选择 ng-model="blisterPackTemplateSelected" ng-change="changedValue(blisterPackTemplateSelected)"data-ng-options="blisterPackTemplate 作为泡罩包装模板.泡罩包装模板中的泡罩包装模板的名称"><option value="">选择账户</option></选择>{{itemList}}

js:

function ctrl($scope) {$scope.itemList = [];$scope.blisterPackTemplates = [{id:1,name:"a"},{id:2,name:"b"},{id:3,name:"c"}];$scope.changedValue = 函数(项目){$scope.itemList.push(item.name);}}

实例:http://jsfiddle.net/choroshin/9w5XT/4/

I have in my .html page a dropdown list,

Dropdown:

<select ng-model="blisterPackTemplateSelected" data-ng-options="blisterPackTemplate as blisterPackTemplate.name for blisterPackTemplate in blisterPackTemplates">
    <option value="">Select Account</option>
</select>

I want to execute an action when the user select a value. So In my controller I did:

Controller:

$scope.$watch('blisterPackTemplateSelected', function() {
    alert('changed');
    console.log($scope.blisterPackTemplateSelected);
});

But the changing the value in the dropdownlist doesn't trigger the code : $scope.$watch('blisterPackTemplateSelected', function()

As a result I tried another method with a : ng_change = 'changedValue()' on the select tag

and

Function:

$scope.changedValue = function() {
   console.log($scope.blisterPackTemplateSelected);
}

But the blisterPackTemplateSelected is stored into a child scope. I read that the parent can't get access to the child scope.

What is the correct/best way to execute something when a selected value in a dropdown list changes? If it's method 1, what am I doing wrong with my code?

解决方案

as Artyom said you need to use ngChange and pass ngModel object as argument to your ngChange function

Example:

<div ng-app="App" >
  <div ng-controller="ctrl">
    <select ng-model="blisterPackTemplateSelected" ng-change="changedValue(blisterPackTemplateSelected)" 
            data-ng-options="blisterPackTemplate as blisterPackTemplate.name for blisterPackTemplate in blisterPackTemplates">
      <option value="">Select Account</option>
    </select>
    {{itemList}}     
  </div>       
</div>

js:

function ctrl($scope) {
  $scope.itemList = [];
  $scope.blisterPackTemplates = [{id:1,name:"a"},{id:2,name:"b"},{id:3,name:"c"}];

  $scope.changedValue = function(item) {
    $scope.itemList.push(item.name);
  }       
}

Live example: http://jsfiddle.net/choroshin/9w5XT/4/

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