Sunday, 3 May 2015

AngularJS Input Validation



AngularJS forms and controls can validate input data.

Input Validation:
AngularJS forms and controls can provide validation services, and notify users of invalid input.
Tips: Client-side validation cannot alone secure user input. Server side validation is also necessary.

Example Code:
<!DOCTYPE html>
<html>

<head>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
</head>

<body>
<h2>Validation Example</h2>

<form  ng-app="myApp" ng-controller="validateCtrl" name="myForm" novalidate>

<p>Username:<br>
  
<input type="text" name="user" ng-model="user" required>
  
<span style="color:red" ng-show="myForm.user.$dirty && myForm.user.$invalid">
    
<span ng-show="myForm.user.$error.required">Username is required.</span>
  
</span>
</p>

<p>Email:<br>
  
<input type="email" name="email" ng-model="email" required>
  
<span style="color:red" ng-show="myForm.email.$dirty && myForm.email.$invalid">
  
<span ng-show="myForm.email.$error.required">Email is required.</span>
   
<span ng-show="myForm.email.$error.email">Invalid email address.</span>
  
</span>
</p>

<p>
  
<input type="submit"
  ng-disabled=
"myForm.user.$dirty && myForm.user.$invalid ||
  myForm.email.$dirty && myForm.email.$invalid"
>
</p>

</form>

<script>
var app = angular.module('myApp', []);
app.controller('validateCtrl', function($scope) {
    $scope.user = 'Ravi Gupta';
    $scope.email = 'ravig.spm@gmail.com';
});
</script>

</body>
</html>

The HTML form attribute novalidate is used to disable default browser validation.

Example Explained:
The AngularJS directive ng-model binds the input elements to the model.
The model object has two properties: user and email.
Because of ng-show, the spans with color:red are displayed only when user or email is $dirty and $invalid.
Property
Description
$dirty
The user has interacted with the field.
$valid
The field content is valid.
$invalid
The field content is invalid.
$pristine
User has not interacted with the field yet.



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