Checking for an empty list in AngularJS

I have a question, I've included the code snippet below in my controller:

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

I'm trying to check if vf.filtroses is empty or has elements. I attempted using .length and equals:

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

Unfortunately, the above approach did not work for me!

Any suggestions please?

javascriptangularjs

Answer №1

Make sure to place the size validation within the success callback:

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

Answer №2

To determine the length of an array or list of objects, you can utilize the .length property.

filters.noFilters = false;
filters.filterOptions = [];
FilteringService.getCurrentUser().then(function(response) {
    filters.filterOptions = response.data;

    filters.noFilters = filters.filterOptions && filters.filterOptions.length > 0;
});

Answer №3

By verifying if the value is null or undefined, you can effectively address the issue at hand.

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

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