Hello folks! welcome back to a new edition of our tutorial on AngularJS. In this tutorial, we will be studying about AngularJS Forms.
AngularJS enhances filling and validation of forms. We can make use of ng-click event to handle the click button and utilize $dirty and $invalid flags to do validation in a seamless manner. Make use of novalidate with a form declaration to disable any browser-specific validation. The form controls heavily utilizes AngularJS events. Let's take a look at some of the events.
AngularJS enhances filling and validation of forms. We can make use of ng-click event to handle the click button and utilize $dirty and $invalid flags to do validation in a seamless manner. Make use of novalidate with a form declaration to disable any browser-specific validation. The form controls heavily utilizes AngularJS events. Let's take a look at some of the events.
AngularJS Events
AngularJS makes available multiple events that are associated with the HTML controls. For instance, the ng-click directive is mainly associated with a button. Following are the events supported in AngularJS -
- ng-click
- ng-dbl-click
- ng-change
- ng-keydown
- ng-keyup
- ng-keypress
- ng-mousenter
- ng-mouseleave
- ng-mousedown
- ng-mouseup
- ng-mousemove
- ng-mouseover
- ng-keypress
ng-click Event
Reset data of a form using on-click directive of a button.
<input name = "firstname" type = "text" ng-model = "firstName" required> <input name = "lastname" type = "text" ng-model = "lastName" required> <input name = "email" type = "email" ng-model = "email" required> <button ng-click = "reset()">Reset</button> <script> function studentController($scope) { $scope.reset = function() { $scope.firstName = "Kennedy"; $scope.lastName = "Nkpara"; $scope.email = "KennedyNkpara@webdesigntutorialz.com"; } $scope.reset(); } </script>
READ: AngularJS | Modules
Validate Data
The following can be used to track error -
- $dirty - This states that value has been changed.
- $invalid - This states that value entered is invalid.
- $error - This states the exact error.
Example
The following example below illustrates all the above mentioned directives -
Create a file testAngularJS.html.
Create a file testAngularJS.html.
<html> <head> <title>Angular JS Forms</title> <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script> <style> table, th , td { border: 1px solid grey; border-collapse: collapse; padding: 5px; } table tr:nth-child(odd) { background-color: #f2f2f2; } table tr:nth-child(even) { background-color: #ffffff; } </style> </head> <body> <h2>AngularJS Sample Application</h2> <div ng-app = "mainApp" ng-controller = "studentController"> <form name = "studentForm" novalidate> <table border = "0"> <tr> <td>Enter first name:</td> <td><input name = "firstname" type = "text" ng-model = "firstName" required> <span style = "color:red" ng-show = "studentForm.firstname.$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 = "Kennedy"; $scope.lastName = "Nkpara"; $scope.email = "KennedyNkpara@webdesigntutorialz.com"; } $scope.reset(); }); </script> </body> </html>
Output
Open the file testAngularJS.html in any web browser to see the result -
AngularJS Sample Application
READ: AngularJS | HTML DOM
Alright guys! This is where we are going to be rounding up for this tutorial. In our next tutorial, we are going to be studying about AngularJS Includes.
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