The Angular directive ng-model is not able to return a value

I'm currently troubleshooting an issue with the filters in an older project. Here's the HTML snippet:

<input type="text" class="form-control" ng-model="FilterEventsEdit"
       ng-change="FilterEvents()"
       style="width: 300px; margin-bottom: 5px; display: inline;">

And now onto the JavaScript:

$scope.FilterEvents = function () {
    $scope.EventsGridDataSource.filter({
        logic: "or",
        filters: [
            { field: "Name", operator: "contains",
              value: $scope.FilterEventsEdit },
            { field: "Expression", operator: "contains",
              value: $scope.FilterEventsEdit }
        ]
    });
};

Despite having a similar setup that works with different models, I keep getting $scope.FilterEventsEdit as undefined. The problem has me stumped.

javascriptangularjsangular-ngmodel

Answer №1

Make sure to set the $scope.FilterEventsEdit variable before attempting to use it.

$scope.FilterEventsEdit = "";

$scope.FilterListEvents = function () {
    $scope.EventGridDataSource.filter({
        logic: "or",
        filters: [
            { field: "Title", operator: "contains", value: $scope.FilterEditEvents },
            { field: "Description", operator: "contains", value: $scope.FilterEditEvents }
        ]
    });
};

Answer №2

When using ng-model in your controller, you are able to retrieve the value of the text box correctly. The event is triggered when any input is entered into the text box. However, it's important to check the initial value of $scope.FilterEventsEdit when the page loads. If it hasn't been set, it defaults to undefined. Your method is currently only called when the input text changes. I conducted a test on a sample JS fiddle and everything seemed to be functioning properly. Here is a snippet of the code:

<input type="text" class="form-control" ng-model="FilterEventsEdit" ng-change="FilterEvents()" style="width: 300px; margin-bottom: 5px; display: inline;">

// Setting empty string as default. Adjust this based on your requirements
$scope.FilterEventsEdit = '';
// When not explicitly assigned, console will log 'undefined'
console.log('filterEventsEdit: ', $scope.FilterEventsEdit);

$scope.FilterEvents = function () {
    console.log($scope.FilterEventsEdit);
    /* Commenting out the filter logic for testing purposes
     $scope.EventsGridDataSource.filter({
        logic: "or",
        filters: [
          { field: "Name", operator: "contains", value: $scope.FilterEventsEdit },
          { field:"Expression", operator: "contains", value: $scope.FilterEventsEdit}
        ]
    });*/
};

The method will also display the current value of the text box. For a demonstration, feel free to experiment with this working JS fiddle: https://jsfiddle.net/sagarag05/4jb1cpog/6/

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