AngularJs Forms

Hi everyone in this blog I’m explaining about AngularJs forms.

Introduction:

AngularJs enriches form filling and validation, We can use ng-click to handle AngularJs click on a button and use $dirty and $invalid flags to do the validations in a seemless way. Use novalidate with a form declaration to disable any browser-specific validation. Forms controls make heavy use of angularjs events. Let’s have a quick look on the event first.

Events:

AngularJS provides multiple events which can be associated with the HTML controls. For example, ng-click is normally associated with the button. Following are supported events in Angular JS.

1.    ng-click

2.   ng-dbl-click

3.   ng-mousedown

4.   ng-mouseup

5.   ng-mouseenter

6.   ng-mouseleave

7.   ng-mousemove

8.   ng-mouseover

9.   ng-keydown

10. ng-keyup

11.  ng-keypress

12. ng-change

ng-click:

Reset data of a form using on-click directive of a button.

<input name='firstname' type='text' ng-model='firstName' required>
<input name='lastname' type='text' ng-model='lastName' required>
<input name='email' type='email' ng-model='email' required>
<button ng-click='reset()'>Reset</button>
<script>
    function studentController($scope) {
        $scope.reset = function () {
            $scope.firstName = 'Kamlakar';
            $scope.lastName = 'Singh';
            $scope.email = 'sample@sample.com';
        }
        $scope.reset();
    }
</script>
Validate data:

The following can be used to track error.

1.       $dirty - states that value has been changed.

2.       $invalid- states that value entered is invalid.

3.       $error- states the exact error.

Example:

<html>
<head>
<title>Angular JS Forms</title>
<script src='http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js'></script>
<style>
table, th , td {
  border: 1px solid grey;
  border-collapse: collapse;
  padding: 5px;
}
table tr:nth-child(odd) {
  background-color: #f2f2f2;
}
table tr:nth-child(even) {
  background-color: #ffffff;
}
</style>
</head>
<body>
<h2>AngularJS Sample Application</h2>
<div ng-app='mainApp' ng-controller='studentController'>
<form name='studentForm' novalidate>
<table border='0'>
<tr><td>Enter first name:</td><td><input name='firstname' type='text' ng-model='firstName' required>
   <span style='color:red' ng-show='studentForm.firstname.$dirty && studentForm.firstname.$invalid'>
      <span ng-show='studentForm.firstname.$error.required'>First Name is required.</span>
   </span>
</td></tr>
<tr><td>Enter last name: </td><td><input name='lastname'  type='text' ng-model='lastName' required>
   <span style='color:red' ng-show='studentForm.lastname.$dirty && studentForm.lastname.$invalid'>
      <span ng-show='studentForm.lastname.$error.required'>Last Name is required.</span>
   </span>
</td></tr>
<tr><td>Email: </td><td><input name='email' type='email' ng-model='email' length='100' required>
<span style='color:red' ng-show='studentForm.email.$dirty && studentForm.email.$invalid'>
      <span ng-show='studentForm.email.$error.required'>Email is required.</span>
      <span ng-show='studentForm.email.$error.email'>Invalid email address.</span>
   </span>
</td></tr>
<tr><td><button ng-click='reset()'>Reset</button></td><td><button
                ng-disabled='studentForm.firstname.$dirty && studentForm.firstname.$invalid ||
                                                  studentForm.lastname.$dirty && studentForm.lastname.$invalid ||
                                                  studentForm.email.$dirty && studentForm.email.$invalid'
                ng-click='submit()'>Submit</button></td></tr>
</table>
</form>
</div>
<script>
    var mainApp = angular.module('mainApp', []);
 
    mainApp.controller('studentController', function ($scope) {
        $scope.reset = function () {
            $scope.firstName = 'Kamlakar';
            $scope.lastName = 'Singh';
            $scope.email = 'sample@sample.com';
        }
        $scope.reset();
    });
</script>
</body>
</html>

 

Output:

AngularJs Forms

When we have empty every field that time our form give some message like this

AngularJs Forms

Last updated:2/22/2018 1:23:13 AM
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