The final element of an array is inaccessible using AngularJS ng-repeat following a slice()

Utilizing ng-repeat from an array, I have created a select element:

<select data-ng-model='selectedTagForNew' ng-change="selectedTagForNewChange()" >
    <option ng-value="{{tag.arrayindex}}" data-ng-repeat="tag in tags | orderBy:'seq'">{{tag.seq}}&nbsp;{{tag.name}}&nbsp;({{tag.number}})</option>
</select>

Within my controller, on specific actions, I remove the selected element from the array:

tags.splice($scope.selectedTagForNew,1);
for(i=0;i<tags.length;i++){
        tags[i].arrayindex=i;
}
$scope.tags=tags;

The issue arises when, after the first slice(), the last element in the array is selected resulting in $scope.selectedTagForNew being undefined. Consequently, tags[$scope.selectedTagForNew] becomes a null object even though it is displayed in the list. What could be causing this anomaly?

UPDATE: After numerous tests, it appears that ng-repeat does not get updated which causes it to return old values of the model (tag.arrayindex)

Answer №1

A more efficient method for cutting array elements

If you're using TypeScript

const position = this.items.map(item => { return item.id; }).indexOf(selectedItem.id);
this.items.splice(position, 1);

If you prefer JavaScript, you can create a custom function

Array.prototype.removeObject = function (elementToRemove) {
        //Remove the specified element from the array
        var idx = this.indexOf(elementToRemove);
        if (idx !== -1) { // Check if element exists
            this.splice(idx, 1);
        }
    };

and then apply it like so

items.removeObject(targetElement);

Answer №2

To access the index of an array in HTML, you can use the $index variable. For more information, check out this link.

Instead of using ng-repeat on options tags, consider using the ng-options directive provided by Angular. Learn more about it here.

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