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JavaScript AngularJS Basics (1.x) Improving Our Todo App Finalizing Our Application

Posted by Madelyn Petersohn
Madelyn Petersohn
5,005 Points

Issues with deleting checked-off items

Has anyone else been having issues with deleting completed items? I've been observing strange behavior after checking a todo as completed and then trying to delete that todo. Sometimes it deletes the todo above it, sometimes it deletes the one after it, or sometimes it deletes the correct item. I'm not sure why this is happening. Any suggestions?

Thomas Nilsen
Thomas Nilsen
14,957 Points

That's difficult to say without having a look at your code

3 Answers

Daniel Li
Daniel Li
15,244 Points
Daniel Li
Daniel Li
15,244 Points

The problem lies with this piece of code that was added some lessons ago.

$scope.deleteTodo = function(todo, $index) {
    dataService.deleteTodo(todo);
    $scope.todos.splice($index, 1);
};

$index is dynamic, so when a completed todo is moved to the bottom of the list its value changes. Splicing was done on the todos array in $scope which the index never changes.

This is my fix

$scope.deleteTodo = function(todo, $index) {
  dataService.deleteTodo(todo);
  $scope.todos = $scope.todos.filter(function(val) {
    return !(val.name === todo.name);
  });
};

I've filter away the todo object in $scope.todos that matches the name value on the given todo, not the most elegant perhaps.

Marina Kazakova
Marina Kazakova
5,765 Points
Marina Kazakova
Marina Kazakova
5,765 Points

I noticed this too. How would you suggest to fix this?

Daniel Li
Daniel Li
15,244 Points

Updated my answer, hope it helps! :)

Marina Kazakova
Marina Kazakova
5,765 Points
Marina Kazakova
Marina Kazakova
5,765 Points

Thank you :)