Getting console error for object return

Question

Hi i have to disable button if i get scenariosViewAll.collectionBookObject ={} array ,For this i am using function to return below is my code:

  <button" ng-disabled="scenariosViewAll.isSetDisable(scenariosViewAll.collectionBookObject)">Create Book from Collection</button>

and in controller my code is:

 function isSetDisable(obj) {
           return typeof(obj === 'Object') && Object.keys(obj).length === 0 ? true : false;
        }

getting console error as below and it is working properly, any wrong in my code.

lib.min.js:3762 TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at scenariosViewAllController.isSetDisable (app.min.js:29729)
    at fn (eval at compile (lib.min.js:3876), <anonymous>:4:415)
    at m.$digest (lib.min.js:3787)
    at m.$apply (lib.min.js:3790)
    at lib.min.js:3803
    at e (lib.min.js:3690)
    at lib.min.js:3693

typeof(obj === 'Object') will always return "boolean" which is truthy — Andreas
– Andreas, Commented Dec 28, 2017 at 13:09
@SudhirMN use typeof(obj) instead of typeof(obj === "Object) — gvmani
– gvmani, Commented Dec 28, 2017 at 13:13
(typeof(obj )=== 'Object') instead of typeof(obj === 'Object') — Negi Rox
– Negi Rox, Commented Dec 28, 2017 at 13:14

Emre Kabaoglu · Accepted Answer · 2017-12-28 13:16:38Z

1

You should change Object condition and add extra condition to handle possible null values;

 function isSetDisable(obj) {
           return obj != null && typeof(obj) == typeof({}) && Object.keys(obj).length === 0 ? true : false;
        }

answered Dec 28, 2017 at 13:16

Emre Kabaoglu

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Comments

gvmani · Accepted Answer · 2017-12-28 13:11:11Z

0

function isSetDisable(obj) {
           return typeof(obj) === 'object' && Object.keys(obj).length === 0 ? true : false;
        }

answered Dec 28, 2017 at 13:11

gvmani

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