Automatically execute a function when the number input changes, but only if no further changes are detected after a certain period of time

Question

Automatically execute a function when the number input changes, but only if no further changes are detected after a certain period of time

I am implementing angularjs with an input field for numbers. I want to trigger an action automatically after a certain amount of time, but only if no further changes have been made to the number within that time frame (let's say 2 seconds).

In my example on Plunker, the action is currently being called every time the number changes. However, I would like the action to be executed only when the user has not made any changes to the value for more than 2 seconds.

<div class="col-md-3 divGridText">
    <label for="excludeMinutesStep" style="font-weight:bold">Exclude tasks &lt; </label>
    <input id="excludeMinutesStep" min="0" max="10" ng-model="excludeValue" ng-change="numericStepperChanged(excludeValue)" size="2" style="width:40px;" type="number" /> <b>minutes</b>
</div>

$scope.excludeValue = 5;
$scope.numericStepperInitValue = 0;

$scope.numericStepperChanged = function(data) {console.log("A");
  $scope.numericStepperHit = true;
  if (data != undefined) {
    $scope.excludeValue = data;
    if (data == 0) {
      $scope.isExcludeNeeded = false;
    }

    if ($scope.numericStepperInitValue == 0) {
      $timeout($scope.callAtNumercStepperChangeTimeout, 2000);
    }
  }
}

$scope.callAtNumercStepperChangeTimeout = function() {
  $scope.numericStepperHit = false;
  $scope.numericStepperInitValue++;
  $scope.changeGraph();
}

$scope.changeGraph = function() {
  if (!$scope.numericStepperHit) {
    console.log("Action called "+$scope.excludeValue);
    $scope.mytext = "Action called "+$scope.excludeValue;
    $scope.isExcludeNeeded = true;
  }
}

javascript angularjs

Answer 1

Answer №1

Debouncing is a common and useful pattern that you may need in your code.

An easy way to implement debouncing is by using underscoreJs debounce method:

$scope.debouncedFunction = _.debounce(myFunction, 2000);

<input ng-change="debouncedFunction()" size="2" style="width:40px;" type="number" />

If you prefer, you can also create your own debouncing function like this:

var promise = null;
function debouncedFcn{
    if(promise)
        $timeout.cancel(promise);
    var promise = $timeout(myFunction, 2000);
}

For more information, check out the Debounce documentation.

Answer 2

Debouncing is a common and useful pattern that you may need in your code.

An easy way to implement debouncing is by using underscoreJs debounce method:

$scope.debouncedFunction = _.debounce(myFunction, 2000);

<input ng-change="debouncedFunction()" size="2" style="width:40px;" type="number" />

If you prefer, you can also create your own debouncing function like this:

var promise = null;
function debouncedFcn{
    if(promise)
        $timeout.cancel(promise);
    var promise = $timeout(myFunction, 2000);
}

For more information, check out the Debounce documentation.

Answer 3

Answer №2

I created a function called timer that evaluates if a value has changed within a 2-second interval. If not, it triggers the mainFunction() which displays an alert. The timer function is then utilized in $scope.$watch to monitor changes in the excludeValue.

$scope.excludeValue = 5;

$scope.$watch('excludeValue',function(oldVal,newVal){
   if(oldVal !== newVal) // a new change 
   {
      timer(oldVal,newVal)
   }
});

var timer = function(oldVal,newVal){
   var currentVal = angular.copy($scope.excludeValue);
   $timeout(function(){
     if(currentVal == $scope.excludeValue)
     {
       // no changes made within 2 seconds 
       mainFunction()
     }
     else
     {
       // change made within 2 seconds
     }
   }, 2000);
};

timer();

var mainFunction = function(){
   alert('No changes were made within 2 seconds.');
};

You can view the code on Plunker

Answer 4

I created a function called timer that evaluates if a value has changed within a 2-second interval. If not, it triggers the mainFunction() which displays an alert. The timer function is then utilized in $scope.$watch to monitor changes in the excludeValue.

$scope.excludeValue = 5;

$scope.$watch('excludeValue',function(oldVal,newVal){
   if(oldVal !== newVal) // a new change 
   {
      timer(oldVal,newVal)
   }
});

var timer = function(oldVal,newVal){
   var currentVal = angular.copy($scope.excludeValue);
   $timeout(function(){
     if(currentVal == $scope.excludeValue)
     {
       // no changes made within 2 seconds 
       mainFunction()
     }
     else
     {
       // change made within 2 seconds
     }
   }, 2000);
};

timer();

var mainFunction = function(){
   alert('No changes were made within 2 seconds.');
};

You can view the code on Plunker

Automatically execute a function when the number input changes, but only if no further changes are detected after a certain period of time

Answer №1

Answer №2

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