Updating a dropdown list in real-time based on JSON information using AngularJS

I am a beginner in the realm of AngularJS and currently facing an issue that needs resolution. I have implemented two select boxes which are populated with data fetched from an external JSON file. My objective is to dynamically update the options in the second select box based on the selection made in the first one. Each item in the first select box contains a unique key called relation, which I intend to use as a trigger for the dynamic update of options in the second select box.

Seeking assistance from anyone familiar with this scenario. I attempted to create a function but unfortunately, it did not yield the desired outcome. Thank you in advance for any help provided. Below is the structure of the JSON data:

{
"filterElements": [
    {
        "parameters": [
            {
                "paraName": "paraOne",
                "relation": "default"
            },
            {
                "paraName": "paraTwo",
                "relation": "default"
            },
    {
                "paraName": "paraThree",
                "relation": "defaultshort"
            }
        ]
    },
    {
        "relations": [
            {
                "defaultrelation": 
        [
                    "equals",
                    "does not equal",
                    "greater than",
                    "less than"
                ]
            },
            {
                "defaultshort": 
        [
                    "equals",
                    "does not equal"
                ]
            }
        ]
    }
]

}

Link to MyFiddle

Answer №1

According to your code snippet, it seems like you forgot to include the bootstrap application. Take a look at this example:

<body ng-app="list">
 ...
</body>

Once you have added the bootstrap application, make sure to register ListCtrl to the existing application.

var app = angular.module('list',[]);

app.controller('ListCtrl', ListCtrl);

function ListCtrl($scope, $http) {
   ...
}

By following these steps, your controller will be executed, your request will be sent, and you can successfully bind the data to your view.

Answer №2

Figured it out! Check out the solution below:

$scope.change = function (paraSelection) {
$scope.filteredrelations = [];
for(var key in $scope.relations){
  if(angular.isDefined($scope.relations[key][paraSelection.relation])){
    $scope.filteredrelations = $scope.relations[key] paraSelection.relation];
        }
    }
};

You can view a complete working example by clicking this link: Plunker

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