Validating Repeating (ngRepeat) Form Elements. How do I use Angular's form validation on these dynamically created elements?
The common scenario is this, you have some ng-repeat creating inputs of some sort, and you need to validate them individually. The knee-jerk reaction is to try to dynamically add names to the input like name="test{{$index}}"... but that won't really work. So now what? NgForm directive! The ng-form directive allows for nesting forms that can be used for things like partial validation. <! So that's the idea in a nutshell. Form Validation. Basic form validation is already done for you in Angular JS ... if you just know how to use it.
Form validation in Angular is all done by directives, which means you just wire it up in markup, and you don't need to write a "validation function" in your controller to handle any of that dirty work. Angular has wired up most form elements themselves to be directives, so <input type="email"/> will validate an email address and so on.
Angular also looks for attributes like required and handles them appropriately. Let's have a look at some basic form validation in Angular: The form <form name = "mainForm" ng-submit = "sendForm()" > <div> <label for = "firstName" > First Name </label> <input id = "firstName" name = "firstName" type = "text" ng-model = "person.firstName" required /> <span class = "error" ng-show = "mainForm.firstName. Here's a Plunker of the code at work: (Apologies to IE users, Plunker doesn't like you, I'll try to get something else going... Validating A Custom Control in Angular JS with Angular's Built-In Validations. Form validation using Angular JS. Form validation using Angular JS. Form Validation: The AngularJS Way.
Good news first!
Recently I started develop my first real AngularJS web app; it shouldn’t be nothing too complicated… I’m just planning to replace my old excel for family budget with a brand new AngularJS app. The registration view was one of the first views I made, when I started to work on this little project. This gave me the opportunity to learn a lot of thing about AngularJS, and in particular how AngularJS handles client side form validation (one of the topic that I usually less appreciate). In this post I will show how perform client side data validation with AngularJS. I will use both built-in directives, both custom directives. Deal with users authentication in an AngularJS web app. This post is meant to share some thought about the main issues related to the user’s authentication in an AngularJS web app.
This post is about how to maintain, and recognize, the status of authentication of an user (that is, if he’s logged in, or not) between the different routes of a web application. Moreover it also explains how to handle the case of a not authenticated user, who is trying to access to a page, that requires the user to be logged in. Before going into the details of my approach, it is very important to clarify that, because the user has full controll of the browser, each control implemented with front end technologies, must (!) Angular JS: Form Validation. Angular JS: Validating Form Elements in a Repeat. Validating A Custom Control in Angular JS with Angular's Built-In Validations.
Angular JS: Validating Form Elements in a Repeat. Angular JS: Custom Validation via Directives. Okay, for this bit on Angular, I'm going to write up a quick bit on custom validation.
I've gone over form validation before , but I think that there are still plenty of cases that Angular's default validation just doesn't cover. A lot of people's first instinct is to resort to calling controller functions to do their validation. You could do that, but that would break the really slick validation model Angular already has in place. What you really want to do is build a directive that requires ngModel . Requiring ngModel will pass the ngModelController into the linking function as the fourth argument. Form validation with AngularJS. Client-side form validations are one of the coolest features inside of AngularJS.
AngularJS form validation enables you to write a modern HTML5 form that is interactive and responsive from the start. There are many form validation directives available in AngularJS. We’ll talk about a few of the most popular ones here and then we’ll get into how to build your own validations. AngularJS makes it pretty easy for us to handle client-side form validations without adding a lot of extra effort. Although we can’t depend on client-side validations keeping our web application secure, they provide instant feedback of the state of the form. To use form validations, we first must ensure that the form has a name associated with it, like in the above example. All input fields can validate against some basic validations, like minimum length, maximum length, etc.
It is usually a great idea to use the novalidate flag on the form element. Required Minimum length Maximum length.