#Ajax Validation for Angularjs#

ngRemoveValidate makes it easy for you to validate form fields agents data from your server. For example, a sign up form may need to check if the email entered is already registered before submitting the form.

Features:

• Drop in solution for Ajax validation of any text or password input

• Works with Angulars built in validation and cab be accessed at formName.inputName.$error.ngRemoteValidate

• Throttles server requests (default 400ms) and can be set with ng-remote-throttle="550"

• Allows HTTP method definition (default POST) with ng-remote-method="GET"

##Getting started - Example##

Adding ngRemoteValidate to your project

bower install ng-remote-validate

OR

Grab either the minified version or the standard source from the release folder and add it to your project.

<script type="text/javascript" src="../your/path/ngRemoteValidate.js"></script>

Include ngRemoteValidate in you Angular app

var app = angular.module( 'myApp', [ 'remoteValidation' ] );

Using it in your forms

This will be a basic change password form that requires the user to enter their current password as well as the new password.

<h3>Change password</h3>
<form name="changePasswordForm">
    <label for="currentPassword">Current</label>
    <input type="password" 
           name="currentPassword" 
           placeholder="Current password" 
           ng-model="password.current" 
           ng-remote-validate="/customer/validpassword" 
           required>
    <span ng-show="changePasswordForm.currentPassword.$error.required && changePasswordForm.confirmPassword.$dirty">
        Required
    </span>
    <span ng-show="changePasswordForm.currentPassword.$error.ngRemoteValidate">
        Incorrect current password. Please enter your current account password.
    </span>

    <label for="newPassword">New</label>
    <input type="password"
           name="newPassword"
           placeholder="New password"
           ng-model="password.new"
           required>
    
    <label for="confirmPassword">Confirm</label>
    <input ng-disabled=""
           type="password"
           name="confirmPassword"
           placeholder="Confirm password"
           ng-model="password.confirm"
           ng-match="password.new"
           required>
    <span ng-show="changePasswordForm.confirmPassword.$error.match">
        New and confirm do not match
    </span>
    
    <div>
        <button type="submit" 
                ng-disabled="changePasswordForm.$invalid" 
                ng-click="changePassword(password.new, changePasswordForm);reset();">
            Change password
        </button>
    </div>
</form>

##Options## There are a few defaults that can be overwritten with options. They are:

• ng-remote-validate takes a string or an Array of string i.e. ng-remote-validate="/url/one" or ng-remote-validate="[ '/url/one', '/url/two' ]"
• ng-remote-throttle (default: 400) Users inactivity length before sending validation requests to the server
• ng-remote-method (default: 'POST') Type of request you would like to send

Example using all

<input type="password" 
       name="currentPassword" 
       placeholder="Current password" 
       ng-model="password.current" 
       ng-remote-validate="/customer/validpassword"
       ng-remote-throttle="550"
       ng-remote-method="GET"
       required>

<input type="text" 
       name="email" 
       placeholder="Email address" 
       ng-model="email" 
       ng-remote-validate="[ '/customer/email-registered', '/customer/email-restricted' ]"
       ng-remote-throttle="800"
       ng-remote-method="POST"
       required>

ngRemote will also add a class named ng-processing to the input while the Ajax request is processing and also sets a $processing property on your model property. You can add some css to your project to show an animation in the input like so:

input.ng-processing {
    background-image: url(../img/loader-small.gif) !important;
    background-position: right center !important;
    background-repeat: no-repeat;
}

<span class="message" ng-show="formName.inputName.$processing">validating...</span>

##Server side##

Data sent to the server

By default, ngRemoteValidate will send a simple JSON string to the server formatted like so:

{ "value": "inputValue" }

If you would like to change what data is sent to the server, you can create an inputNameSetArgs callback on your controllers $scope. This callback should return the data you want sent to the server.

$scope.currentPasswordSetArgs = function( val, el, attrs, ngModel ) {
    return { value: val, otherData: attrs.otherData };
}; 

Server response

ngRemoteValidate wants a specific JSON response from your servers. The response should look as follows:

{
    isValid: bool, //Is the value received valid 
    value: 'myPassword!' //value received from server
}