xiaolong97427 xiaolong97427 - 6 months ago 13
AngularJS Question

Get value when selected ng-option changes

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?

Answer

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/