Attempting to establish the array's definition

I encountered the error message shown below:

angular.min.js:114TypeError: Cannot read property 'slice' of undefined at templateController.js:28

The issue is due to this line of code:

$scope.filteredTemplates = $scope.templates.slice(begin, end);

Below is my code snippet:

var template = angular.module('TemplateCtrl',['ui.bootstrap']);

template.controller('TemplateController',function($scope, Template){
    var getTemplates = Template.all();
    $scope.filteredTemplates = [];
    $scope.currentPage = 1;
    $scope.numPerPage = 10;
    $scope.maxSize = 5;

    getTemplates.success(function(response){
        if(response[0] == 200){   
            $scope.templates = response[1];

        }else{
           //user wasn't logged in to view the templates (voorbeeld contracten)
            console.log('Please log in');
        }
    });

    $scope.numPages = function () {
        return Math.ceil($scope.templates.length / $scope.numPerPage);
      };

    $scope.$watch('currentPage + numPerPage', function() {
        var begin = (($scope.currentPage - 1) * $scope.numPerPage)
        , end = begin + $scope.numPerPage;

        $scope.filteredTemplates = $scope.templates.slice(begin, end);
      });
});

I'm working on implementing pagination for an array in $scope.templates.

To achieve this, I am utilizing the $watch() method to track the user's current page and appropriately slice the $scope.templates array based on the selected page.

However, a challenge arises when using a callback within the .success() method. The callback's execution timing is unknown.

As a result, the $watch() function executes first and detects that $scope.templates is undefined. Is there a workaround or solution to ensure the pagination functionality works as intended?

Answer №1

It appears that your watch is being executed before the getTemplates function is resolved. This results in $scope.templates not being defined. To solve this issue, initialize $scope.template = []; at the beginning and only execute the slice method if $scope.template.length>0

 $scope.templates = [];
 $scope.$watch('currentPage + numPerPage', function() {
    var begin = (($scope.currentPage - 1) * $scope.numPerPage)
    , end = begin + $scope.numPerPage;
    if($scope.templates.length>0){
        $scope.filteredTemplates = $scope.templates.slice(begin, end);
    }
  });

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