Persistently Undefined Angular Attribute

I have been trying to dynamically bind a CSS class using an AngularJS function. While the functionality is working properly, I keep encountering numerous errors in the browser console. Can anyone offer assistance with this issue? I have included my code and a screenshot below.

 <tr ng-repeat-start="inventory in inventoryDetails.HotelFareInventoryAllotmentDetails">
                                <td  rowspan="2">{{inventory.HotelRoomCategoryName}}</td>
                                <td>Inventory</td>
                                <td ng-class="getClassName(1)">{{inventory.D1.Inventory}}</td>
                                <td ng-class="getClassName(2)">{{inventory.D2.Inventory}}</td>
                                <td ng-class="getClassName(3)">{{inventory.D3.Inventory}}</td>
                 {{inventory.D31.Inventory}}</td>                              
                            </tr>
                            <tr ng-repeat-end>
                                <td>CutOff</td>
                                <td ng-class="{{getClassName(1}})">{{inventory.D1.Cutoff}}</td>
                                <td ng-class="getClassName(2)">{{inventory.D2.Cutoff}}</td>
                                <td  ng-class="getClassName(3)">{{inventory.D3.Cutoff}}</td>

                            </tr> 

  $scopeChild.getClassName = function (dayID) {

                                var dayIndex = parseInt(dayID) - 1;
                                if ($scopeChild.Days[dayIndex].IsWeekend) {
                                    return 'weekend';
                                }
                                else {
                                    return '';
                                }



                        }

https://i.sstatic.net/kAi3U.png

Answer №1

Upon examining the error message, it is evident that $scopeChild does exist and contains a member named Days. However, the issue arises from $scopeChild.Days[dayIndex] being undefined. Consequently, IsWeekend cannot be accessed as it is not a property of an undefined object, resulting in the error. There are two possible scenarios to address this:

  • Ensure that $scopeChild.Days[dayIndex] always exists whenever the function is called by refining the logic in your code.
  • Prevent the error from occurring, even if the function is invoked incorrectly.

If you aim to create a library, then opting for a foolproof solution is crucial. On the other hand, if the problem lies within your algorithm, a reevaluation is necessary. For example, when considering the variable dayID, verify that its values fall within the range of 0..6 or 1..7. What value corresponds to Monday in your case? Is the parameter dayID consistently numeric without any trailing white spaces? Does this number exist within Days? These considerations indicate a potential flaw in the algorithm that requires debugging. Here's an illustration:

  $scopeChild.getClassName = function (dayID) {

                                var dayIndex = parseInt(dayID) - 1;
                                if (!$scopeChild.Days[dayIndex]) {
                                    dayIndex = "Busted..."; //add a breakpoint here to troubleshoot
                                    return;
                                }
                                if ($scopeChild.Days[dayIndex].IsWeekend) {
                                    return 'weekend';
                                }
                                else {
                                    return '';
                                }

                        }

Furthermore, vkrishna correctly pointed out a syntax error where a parenthesis was closed without being opened. It's recommended to include the error text directly in the question rather than attaching it as an image.

Answer №2

Here's a quick and simple solution:

if ($scopeChild.Days && $scopeChild.Days[dayIndex] && $scopeChild.Days[dayIndex].IsWeekend){}

This solution may come in handy especially when dealing with asynchronously loaded data.

If you want to delve deeper into this issue, please provide the full controller definition for further investigation.

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