Client-side Validation should be simple and clean.
Don't let Client-side Validation dirty your controller.

Setup your Validation on config phase by using some rules (example)
If you prefer schema over html attributes , try angular-validation-schema (Demo)
And add Validation in your view only.

angularjs 1.2.x support to version angular-validation 1.2.x
angularjs 1.3.x support after version angular-validation 1.3.x
angularjs 1.4.x support after version angular-validation 1.4.x

AngularJS 1.2.x (for angular-validation 1.2.x)
AngularJS 1.3.x (for angular-validation 1.3.x)
AngularJS 1.4.x (for angular-validation 1.4.x)

https://hueitan.github.io/angular-validation/

Install with npm

npm install angular-validation

or with bower

bower install angular-validation

<script src="dist/angular-validation.js"></script>
<script src="dist/angular-validation-rule.js"></script>

angular.module('yourApp', ['validation']);
// OR including your validation rule
angular.module('yourApp', ['validation', 'validation.rule']);

<form name="Form">
    <div class="row">
        <div>
            <label>Required</label>
            <input type="text" name="required" ng-model="form.required" validator="required">
        </div>
        <div>
            <label>Url</label>
            <input type="text" name="url" ng-model="form.url" validator="required, url">
        </div>
        <button validation-submit="Form" ng-click="next()">Submit</button>
        <button validation-reset="Form">Reset</button>
    </div>
</form>

Documentation API

1. Required
2. Url
3. Email
4. Number
5. Min length
6. Max length

5 and 6 require you to pass an inline parameter to set the length limit. Eg, maxlength=6.

Anyone can give a PR for this angular-validation for more built-in validation

To integrate this package with Bootstrap you should do the following.

Add the following LESS to your project

.ng-invalid.ng-dirty{
    .has-error .form-control;
}
label.has-error.control-label {
    .has-error .control-label;
}

Change the Error HTML to something like:

$validationProvider.setErrorHTML(function (msg) {
       return  "<label class=\"control-label has-error\">" + msg + "</label>";
});

You can add the bootstrap class .has-success in a similar fashion.

To toggle .has-error class on bootstrap .form-group wrapper for labels and controls, add:

angular.extend($validationProvider, {
    validCallback: function (element){
        $(element).parents('.form-group:first').removeClass('has-error');
    },
    invalidCallback: function (element) {
        $(element).parents('.form-group:first').addClass('has-error');
    }
});

MIT

See release

Thank you for your contribution @lvarayut and @Nazanin1369 ❤️
Thanks for all contributors