How to verify that a list is empty in angularjs

Question

My question is clear i guess, i have the bellow code in my controller

vf.filtroses = [];
    FiltrosService.currentuser().success(function(data, status) {
        vf.filtroses = data;
    });

i want to verify if vf.filtroses has elements or it's empty. i tryed .lenght and equals:

vf.nofiltros = false;
    vf.filtroses = [];
    FiltrosService.currentuser().success(function(data, status) {
        vf.filtroses = data;
    });
    if(angular.equals([], vf.filtroses)){
        vf.nofiltros = true;
    }

but it does not work for me !

any ideas plz??

Possible duplicate of [Check if array is empty or exists](http://stackoverflow.com/questions/11743392/check-if-array-is-empty-or-exists) — Liam, Jan 06 '17 at 14:15

Sreehari S · Accepted Answer · 2017-01-06T14:21:06.177

1

Put the size check inside the success function:

FiltrosService.currentuser().success(function(data, status) {
    vf.filtroses = data;
    if(!(vf.filtroses && vf.filtroses.length>0)){
             vf.nofiltros = true;
             }
    });

edited Jan 06 '17 at 14:21

answered Jan 06 '17 at 14:13

Sreehari S

388
1
12

yeah that's what i was messing – Smahane Jan 06 '17 at 14:24
You can simplify this code to: `vf.nofiltros = !vf.filtroses || !vf.filtroses.length` – Romain Jan 06 '17 at 14:31

Alok · Answer 2 · 2017-01-06T14:29:19.947

0

You can use .length to check the length of the array or list of objects.

vf.nofiltros = false;
vf.filtroses = [];
FiltrosService.currentuser().success(function(data, status) {
    vf.filtroses = data;

    vf.nofiltros = vf.filtroses && vf.filtroses.length > 0;
});

edited Jan 06 '17 at 14:29

answered Jan 06 '17 at 14:19

Alok

1,290
1
11
21

score -1 · Answer 3 · answered Jan 06 '17 at 14:18

-1

Check null or undefined will solve your problem.

if(vf.filtroses!==undefined && vf.filtroses!=null){
    vf.nofiltros = true;
}

answered Jan 06 '17 at 14:18

Arun Shinde

1,185
6
12

How to verify that a list is empty in angularjs

3 Answers3