Get specific object by id from array of objects in AngularJS

Question

I have a JSON file containing some data I d like to access on my AngularJS website. Now what I want is to get only one object from the array. So I d like for example Item wi

Answer 1

The only way to do this is to iterate over the array. Obviously if you are sure that the results are ordered by id you can do a binary search

Answer 2

Using ES6 solution

For those still reading this answer, if you are using ES6 the find method was added in arrays. So assuming the same collection, the solution'd be:

const foo = { "results": [
    {
        "id": 12,
        "name": "Test"
    },
    {
        "id": 2,
        "name": "Beispiel"
    },
    {
        "id": 3,
        "name": "Sample"
    }
] };
foo.results.find(item => item.id === 2)

I'd totally go for this solution now, as is less tied to angular or any other framework. Pure Javascript.

Angular solution (old solution)

I aimed to solve this problem by doing the following:

$filter('filter')(foo.results, {id: 1})[0];

A use case example:

app.controller('FooCtrl', ['$filter', function($filter) {
    var foo = { "results": [
        {
            "id": 12,
            "name": "Test"
        },
        {
            "id": 2,
            "name": "Beispiel"
        },
        {
            "id": 3,
            "name": "Sample"
        }
    ] };

    // We filter the array by id, the result is an array
    // so we select the element 0

    single_object = $filter('filter')(foo.results, function (d) {return d.id === 2;})[0];

    // If you want to see the result, just check the log
    console.log(single_object);
}]);

Plunker: http://plnkr.co/edit/5E7FYqNNqDuqFBlyDqRh?p=preview

Answer 3

You can use ng-repeat and pick data only if data matches what you are looking for using ng-show for example:

 <div ng-repeat="data in res.results" ng-show="data.id==1">
     {{data.name}}
 </div>    

Answer 4

I just want to add something to Willemoes answer. The same code written directly inside the HTML will look like this:

{{(FooController.results | filter : {id: 1})[0].name }}

Assuming that "results" is a variable of your FooController and you want to display the "name" property of the filtered item.

Answer 5

Why complicate the situation? this is simple write some function like this:

function findBySpecField(data, reqField, value, resField) {
    var container = data;
    for (var i = 0; i < container.length; i++) {
        if (container[i][reqField] == value) {
            return(container[i][resField]);
        }
    }
    return '';
}

Use Case:

var data=[{
            "id": 502100,
            "name": "Bərdə filialı"
        },
        {
            "id": 502122
            "name": "10 saylı filialı"
        },
        {
            "id": 503176
            "name": "5 sayli filialı"
        }]

console.log('Result is  '+findBySpecField(data,'id','502100','name'));

output:

Result is Bərdə filialı

Answer 6

personally i use underscore for this kind of stuff... so

a = _.find(results,function(rw){ return rw.id == 2 });

then "a" would be the row that you wanted of your array where the id was equal to 2