Populate One Input Field Based On Other

I am using angular.js in my project. In the template I have :

Field 1

Solution 1:

You can use $watch, it registers a listener callback to be executed whenever the watchExpression changes.

$scope.$watch(function () {
    return$scope.f1;
},
function (newValue, oldValue) {
    $scope.f2 = $scope.f1;
}, true);

Working Demo

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