Angular directive that verifies the presence of a specific number of child li elements

Currently, I have a basic ul that utilizes ng-repeats to display li elements fetched from an external source via a promise. There is also a search input present which filters these elements, and I want the ul to be hidden when there are no more elements that match the search criteria.

I attempted to create a directive for this purpose, but unfortunately, it's not functioning as expected:

.directive('predictive', function() {
    return {
        restrict: 'A',
        link: function(scope, element) {
            console.log(element);
            if (!$(element).children("li").length) {
                $(element).hide();
            }
        }
    }
});

The issue with this directive is that it hides everything too quickly, before the data service has populated the list with li's.

Is there anything I can do to resolve this?

UPDATE: Here is the code snippet:

<input type="text" ng-model="predictiveSearch"></input>

<ul ng-repeat="(key, option) in Service1.predictive" predictive>
        <span><b>{{key}}</b></span>
        <li ng-repeat="option in option | filter:predictiveSearch">
          <a href="" ng-click="handlePredictiveSelection(option)">{{option}}</a>
        </li>
</ul>

Answer №1

To simplify your code, utilize the filter alias within the ng-repeat directive and verify the length using an ng-if statement

<ul ng-repeat="(key, option) in Service1.predictive" ng-if="filteredArray.length">

        <li ng-repeat="option in option | filter:predictiveSearch as filteredArray">

        </li>
</ul>

Answer №2

Instead of creating a custom directive, you can consider using

<ul ng-repeat="(key, option) in Service1.predictive" ng-hide="(option | filter:predictiveSearch).length == 0">
.

This approach will only filter your options once, which is more efficient especially if there are multiple options. It's recommended to perform the filtering within the custom directive and hide elements using element.hide() instead of ng-hide.

.directive('predictive', function($filter) {
return {
    restrict: 'A',
    link: function(scope, element) {
        var filter = $filter('filter');

        scope.watch('predictiveSearch', function(value) {
            scope.innerOptions = filter(scope.option, value);
            if (!scope.innerOptions.length) {
                element.hide();
            }
        });

    }
}});

With this setup, you can now iterate over innerOptions using

ng-repeat="option in innerOptions"
, ensuring that the filtering process is only done once inside your directive.

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