Constantly invoking function inside ng-repeat loop

In my controller, I am populating a list on the page. However, I need to exclude certain items from the list based on specific flags associated with them. To achieve this, I have created a simple function that returns a boolean value, which is then used in the ng-show directive to hide these particular items. The function is called multiple times within the ng-repeat block. My expectation is that if the array contains n elements, the function should be invoked n times unless there are changes in the array's contents or length.

<ul>
<li ng-repeat="item in items" ng-show="display(item)">{{item.name}}</li>
</ul>

The display function implemented like below:

display = function(item)
{
    if(item.flag) 
       return true
    else 
       return false;
}

Answer №1

My goal is to always ensure that any function call remains within the controller's scope.

For example, using $scope.display can help clarify things in the following way:

<!-- Iterating through elements in items, such as {name: "a", flag: true} -->
<ul>
  <li ng-repeat="item in items" ng-show="item.flag">{{item.name}}</li>
</ul>

By utilizing ng-show with item.flag directly without a separate function call:

$scope.items = [
    {name: "a", flag: true},
    {name: "b", flag: true},
    {name: "c", flag: false}
];

The resulting output would be:

a
b

I hope this explanation clarifies things for you.

Answer №2

To implement filtering using Angular, you have the option to utilize the integrated filter feature:

<li ng-repeat="product in products | filter: { available: true }">{{product.title}}</li>

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