The Enigma of AngularJS Coding

Check out this code snippet.

$scope.$watch('year', reloadData);
$scope.$watch('month', reloadData);

$scope.year = 2017;
$scope.month = 1;

var reloadData = function() {
   /* Refresh Data */ 
}

var init = function() {
    $scope.year = 2015;
    $scope.month = 3;  
}

init();

How many times do you think the "reloadData" function is called after initialization? Is there a way to trigger reloadData only once when both year and month values are changed simultaneously? For instance:

<input ng-model="year" name="year" id="year">
<input ng-model="month" name="month" id="month">

Changing the year triggers reloadData.

Changing the month triggers reloadData.

Changing both the month and year should only trigger reloadData once.

Thank you!

Answer №1

A great way to demonstrate this is by using multiple watch instances

$scope.$watchGroup(['year', 'month'], function(newValues, oldValues, scope) {
//newValues[0]  represents the updated year
//newValues[1]  represents the updated month

if((newValues[0] != oldValues[0]) && (newValues[1] != oldValues[1])) {//reload()}
}

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