Although, these libraries are offering a lot of goodies, it is highly impractical to import them just for using one or two methods like buying a Ferrari to drive to the supermarket.
AngularJs check empty array
My favorite way to check if a specific object is empty is using the Object. This method returns an array with all own properties of a specific object. The other popular way to check if a specific object is empty, but is also compatible with older versions of the popular browsers is using for.
Theoretically, this will result in a better performance than the previous method. When looping thru the object, it will return false right after the first own property, whereas the first one extracts all the properties and then check the length.
If your intention is your helper method to work with different input types not only objectsyou will want to extend your logic. If you know that your input to the helper function will be always object empty or notthen you can confidently go with any of the first two methods.
Conclusion If you know that your input to the helper function will be always object empty or notthen you can confidently go with any of the first two methods.
The example I gave is pretty much framework agnostic although. This is one of those utility functions that will always be useful, especially if you deal with a lot of objects on a daily basis like I do.
Nice tip. Seems like the Underscore. Thanks for you input! If you don't want to copy-paste this all over your different repositories, you can also try this NPM package or this Bit component.
Written by Kyle Ross. November 02, November 03, February 03, Hi, I'm wondering why the use of hasOwnProperty is required? February 19, May 16, They should work just fine and make it useable anywhere you need.
March 31, April 18, December 21, January 15, April 01, October 03, In this post we will show you Check null empty or undefined Angularjs Examplehear for Check or null or empty or undefined Angularjs Example we will give you demo and example for implement. Few months ago one developer send me email and he say me to i am working on my angularjs application and i need to check variable value is empty or null then both how can i do it.
I said him and also send him solution that i am sharing with you. So basically, you can check it as like bellow code, i also write full example so you can check and see how it works. Hope this code and post will help you to implement Check empty or undefined Angularjs Example.
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Skip to content Search for:. Tags: angularjsangularjs checkangularjs check if object is emptyangularjs check undefinedangularjs check undefined or nullcheck variable is empty in angularcheck-null-empty. Leave a Reply Cancel reply Your email address will not be published. You may have missed.Angular 5: How to Bind/Get selected value/Set Default in SelectList
Arrays, strings, or arguments objects with a length of 0 and objects with no own enumerable properties are considered "empty". Learn more. Checking if object is empty, works with ng-show but not from controller? Ask Question. Asked 6 years, 8 months ago. Active 2 years, 3 months ago. Viewed k times. Is there an alternative? Rahil Wazir 8, 11 11 gold badges 34 34 silver badges 59 59 bronze badges.
This requirement isn't in your question, so my answer is based on the over simplified scenario. YeLiu if you want to make an item in items null, you wont be allowed to make that twice, angular will throw an exception which tells you it does not allow dupes within a collection for unknown reasons for me so far.
Or you could keep it simple by doing something like this: alert angular. Mine as well. Thank good lord I did not have to overload more functions to test it. Very clever approach! Thank you so much! In a private project a wrote this filter angular. Works like a charm. Thanks for sharing! I believe filters should parse content and return a subset of the content. What you describe seems more like a function placed on the scope than a filter. See docs. I think that you are talking about a particular filter called filter or 'filterFilter'.
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This checks first if teamMembers has a value and if teamMembers doesn't have a value, it doesn't try to access length of undefined because the first part of the condition already fails.
Without event. Maybe slight overkill but created library ngx-if-empty-or-has-items it checks if an object, set, map or array is not empty. Maybe it will help somebody. It has the same functionality as ngIf then, else and 'as' syntax is supported. This article helped me alot figuring out why it wasn't working for me either. It give me a lesson to think of the webpage loading and how angular 2 interacts as a timeline and not just the point in time i'm thinking of.
I didn't see anyone else mention this point, so I will So thats why you add the? Learn more. Asked 3 years, 10 months ago. Active 9 months ago. Viewed k times.
Syed mohamed aladeen 5, 3 3 gold badges 22 22 silver badges 50 50 bronze badges. Karthigeyan Vellasamy Karthigeyan Vellasamy 1, 4 4 gold badges 27 27 silver badges 39 39 bronze badges. Active Oldest Votes. Here is the correct link to the safe navigation operator : angular.
AishApp AishApp 3, 2 2 gold badges 25 25 silver badges 33 33 bronze badges. If in array will be something it will display it else not. Druta Ruslan Druta Ruslan 5, 2 2 gold badges 16 16 silver badges 29 29 bronze badges. Mitchell Matula Mitchell Matula 25 4 4 bronze badges. Sign up or log in Sign up using Google.
Sign up using Facebook.AngularJs check empty array- It is very simple to check if an array is empty in AngularJs. You can just use the array. Here in this tutorial we are going to explain how you can check if an array is empty. You can use our online demo try and edit the code online. It will give 0 if array is having no element. June 29, admin. Angularjs uppercase example. Angularjs lowercase example. Angularjs currency filter example.
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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Plunker example. Solution: keyvalue pipe along with?. Check the length property and use? The length property only exists on arrays.
Since the question was about objects, use Object. The example becomes:. If it evaluates to true the next statement checks if the object has at least on proporty.
It does not check whether the property has a value. Just for readability created library ngx-if-empty-or-has-items it will check if an object, set, map or array is not empty.
Maybe it will help somebody. It has the same functionality as ngIf then, else and 'as' syntax is supported. Learn more. Asked 3 years, 11 months ago. Active 8 months ago. Viewed k times. Alireza Valizade. Alireza Valizade Alireza Valizade 3, 7 7 gold badges 26 26 silver badges 43 43 bronze badges. I'm still using a custom function for that.
Hugely important question.