如何使用AngularJS从JSON对象中删除null？

Question

I'm trying to remove an object from Json Object it works..but it replace it with null..i dont know why, how can i remove the null value from the json..heres the function :

company.deleteExternalLinkFromGrid = function (row, matricule) {
        // console.log('Inside of deleteModal, code = ' + code);
        //$scope.sitting= {};
       console.log(matricule);
        //console.log(JSON.stringify(linkJsonObj));
        delete linkJsonObj[matricule];

        console.log(JSON.stringify(linkJsonObj));
    };

heres the object:

[{"name":"xxx","link":"www.ddd.com","id":0,"$$hashKey":"uiGrid-001Z"},null,null]

Answer 1

You can use filter() , x will be without null's.

function test()
{
    var x =[{"name":"xxx","link":"www.ddd.com","id":0,"$$hashKey":"uiGrid-001Z"},null,null].filter(isNotNull);
    alert(JSON.stringify(x));

}

function isNotNull(value) {
  return value != null;
}

fiddle

Answer 2

There are multiple ways to delete an object from an array of objects in JavaScript. You don't need AngularJS for that, you can use VanillaJS.

If you just want the nulls filtered you can use

var yourArray =[{"name":"xxx","link":"www.ddd.com","id":0,"$$hashKey":"uiGrid-001Z"},null,null];
     yourArray = yourArray.filter(function(elt){
     return elt != null;
    });

But this loses the original reference to your object.

If you want to keep the reference, Use array.splice().

  yourArray.forEach(function(){ 
      yourArray.splice(yourArray.indexOf(null),1);
  });   

now you will have null less array in yourArray. This actually deletes an object from an array without changing the reference,

Answer 3

delete will replaced the object with undefined

You can filter the array to remove them using Array#filter()

 var array = [{ "name": "xxx", "link": "www.ddd.com", "id": 0, "$$hashKey": "uiGid-001Z" }, { "name": "xx", "link": "www.dddcom", "id": 1, "$$hashey": "uiGrid-0029" }, { "name": "xxx", "link": "www.ddd.com", "id": 2 }]; delete array[1]; array = array.filter(a=>a); console.log(JSON.stringify(array));