Error: AngularJS throws an error when trying to use an undefined function

Encountering an error on an overview page I've developed. I added pagination to an overview table. The pagination functions properly, but upon loading the page, an error is thrown:

"TypeError: undefined is not a function".

I've been unable to resolve this issue, as I'm relatively new to AngularJS. The error appears to be in the custom filter created on the final return line:

AngularJS:

angular.module('app').filter('pagination', function(){
    return function(input, start)
    {
        start = +start;
        return input.slice(start);
    };
});

HTML:

    <tbody>
    <tr ng-repeat="question in questions | orderBy:order:reverse | filter:searchText | pagination: curPage * pageSize | limitTo: pageSize">
        <td>{{ question.text }}</td>
        <td>{{ question.times_asked }}x </td>
        <td>--%</td>
        <td>
            <button class="btn" ng-click="createModel(question.id)">
                <span class="glyphicon glyphicon-pencil"></span>
            </button>
        </td>
        <td>
            <button class="btn" ng-click="createDeleteModel(question.id)">
                <span class="glyphicon glyphicon-trash"></span>
            </button>
        </td><td>
    </tr>
    </tbody>

<div class="pagination pagination-centered" ng-show="questions.length">
<ul class="pagination-controle pagination">
 <li>
  <button type="button" class="btn btn-primary" ng-disabled="curPage == 0"
 ng-click="curPage=curPage-1"> &lt; Previous Page</button>
 </li>
 <li>
 <span>Page {{curPage + 1}} of {{ numberOfPages() }}</span>
 </li>
 <li>
 <button type="button" class="btn btn-primary"
 ng-disabled="curPage >= questions.length/pageSize - 1"
 ng-click="curPage = curPage+1">Next Page &gt;</button>
 </li>
</ul>
</div>

Appreciate any assistance!

Thomas

Answer №1

Make sure to verify if the input is an array before slicing it

angular.module('app').filter('pagination', function(){
    return function(input, start)
    {
        start = +start;
        if(angular.isArray(input) && input.length > 0) {
             return input.slice(start);
        }
        //console.log(input);
        return input;
    };
});

Utilize console.log to confirm that the input is not an array

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