Angular Validation

# AngularJS Input Validation

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AngularJS forms and controls can validate input data.

## Input Validation

In the previous chapter, you learned about AngularJS forms and controls.

AngularJS forms and controls can provide validation services, and notify users of invalid input.

| Client-side validation cannot alone secure user input. Server side validation is also necessary.

## Application Code

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.26/angular.min.js"></script>
</head>
<body>
<h2>Validation Example</h2>
<form ng-app="" 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.$invalid">
</p>
</form>
<script>
function validateCtrl($scope) {
$scope.user = 'John Doe';
$scope.email = 'john.doe@gmail.com';
}
</script>
</body>
</html>
Try it Yourself »

| 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.

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