¿Cómo se comprueba si un objeto está vacío o no en angular?

How do you check if an object is empty or not in angular?

1. First way is current controller scope, $scope.isObjEmpty = function(obj){ return Object.keys(obj).length === 0; }
2. The second way is a custom filter.
3. The third way is $rootScope, create a plain javascript function and add it in $rootScope server it will accessible default in all scopes and UI.

The best way to check if an object is empty is by using a utility function like the one below.

1. function isEmpty(obj) { for(var key in obj) { if(obj.
2. var myObj = {}; // Empty Object if(isEmpty(myObj)) { // Object is empty (Would return true in this example) } else { // Object is NOT empty }
3. Object.

Use Object. keys(obj). length to check if it is empty.

1. Angular Check ngIf Null or Not. src/app/app.component.ts. selector: ‘my-app’, templateUrl: ‘./app.component.html’,
2. Angular Check ngIf String is Empty or Not. src/app/app.component.ts. selector: ‘my-app’, templateUrl: ‘./app.component.html’,
3. Angular Check ngIf Array is Empty or Not.

We can use multiple conditions in *ngIf with logical operator AND (&&) to decide the trustworthy of *ngIf expression. If all conditions are true, then element will be added to the DOM.

The empty object is not undefined. The only falsy values in JS are 0 , false , null , undefined , empty string, and NaN .

3 Answers. The empty object is not undefined. The only falsy values in JS are 0 , false , null , undefined , empty string, and NaN .

This tutorial will provide example of how to check array is empty in angular. i would like to show you angular check if string is empty or null. This article will give you simple example of angular check if object is empty ngif. it’s simple example of angular check ngif array is empty. Alright, let’s dive into the steps.

In the above code snippet ids has been initialized in component as an array of numbers as follows. ngFor will iterate the given array and hence id%2 will return 0 and 1 alternatingly. If the value is 0 then element with CSS class .one will be added to DOM otherwise the element with CSS class .two will be added to DOM.

ngFor will iterate the given array and hence id%2 will return 0 and 1 alternatingly. If the value is 0 then element with CSS class .one will be added to DOM otherwise the element with CSS class .two will be added to DOM. TypeScript enum can also be used with NgIf. To understand this we are creating an enum as given below.

If ngIf/ngShow if given an argument of a string of 2 characters: ” [” and ” it is treated as if it would be [] – empty array, which is neither true nor false. This comment has been minimized. I am not sure I agree with this. From my chrome console: