Is there a way to dynamically calculate the average of two selected values from different select boxes and display the result in a text field without using ng change? Here's an example:
HTML I:
<select ng-model="box1" ng-options="item for item in boxA"></select>
CONTROLLER:
$scope.boxA=[1,2,3,4,5];
HTML II:
<select ng-model="box2" ng-options="item for item in boxB"></select>
CONTROLLER:
$scope.boxA=[6,7,8,9,10];
Text Box:
<input type="text" ng-model="answer">
To avoid using ng-change, one alternative is to create an interval that periodically checks the values in your controller.
$interval(function() {
if($scope.checkbox1 && $scope.checkbox2) {
$scope.result = (parseInt($scope.checkbox1) + parseInt($scope.checkbox2))/2
}
}, 1000);
If you are looking for a more streamlined approach with Angular, consider using $watchCollection instead:
$scope.$watchCollection('[input1, input2]', function(newValues, oldValues){
console.log('Input1: '+newValues[0]+', Input2: '+newValues[1]);
$scope.solution = (parseInt(newValues[0]) + parseInt(newValues[1])/2; //(or adjust 2 to newValues.length if additional models will be added for averaging;)
});
If you want to monitor the values of $scope.box1 and $scope.box2, you can use the following code snippet:
$scope.$watch('box1', function(value){
$scope.result = calculateAverage(value, $scope.box2);
});
$scope.$watch('box2', function(value){
$scope.result = calculateAverage(value, $scope.box1);
});
Check out this demo on JSFiddle: http://jsfiddle.net/example-demo/123/
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