Creating multiple countdowns in AngularJS using ng-repeat is a handy feature to have

Currently, I have a small AngularJS application that is designed to search for users and display their upcoming meetings. The data is retrieved from the server in JSON format, with time displayed in UTC for easier calculation to local times. While I have successfully written the JavaScript code to calculate the time remaining until the next meeting, I am facing challenges in implementing this functionality within Angular.

My goal is to dynamically update the HTML with the time remaining until a meeting ends or until a meeting starts. I understand how to do this for a single item using the $timeout service, but I am uncertain how to achieve this for multiple items within an ng-repeat loop.

If you have any suggestions or ideas on how to approach this issue, I would greatly appreciate your input! Thank you in advance!

javascriptangularjs

Answer №1

When utilizing ng-repeat, a list of items will be displayed.

<li ng-repeat="items">{{ timeUntil(currentTime) }}</li>

Consider updating only the $scope.currentTime and assigning a timeUntil method to each item. Simply update the $scope.currentTime from your timeout, and let Angular take care of the rest.

It is important to understand that you are essentially inputting an "expression" here, and in Angular, an expression can be intricate, potentially involving a function call.

Answer №2

This question has already been answered in detail here:

If you want to see the code in action, check out this live example: http://plnkr.co/edit/0JqK96irV4ETdWZYxO3P?p=preview

A modification has been made to the HTML to reference a separate array without affecting ng-repeat:

<td>in {{_timeLeft[$index]}}</td>

Here is the code that updates the separate array:

$scope._timeLeft = [];

var intervalID = window.setInterval(function() {
    for (var i=0; i<$scope.items.length; i++) {
      $scope._timeLeft[i] = $scope.timeUntil($scope.items[i]._freeBusyTime);
    }
    $scope.$apply();
}, 1000);

Remember to use $scope.$apply() to notify Angular about the changes in '_timeLeft', which will update all references to it.

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