Validate form using angularjs before ajax request

Question

I have a simple form like this. I am submitting this form via ajax using angularjs. I want to validate this form before sending ajax request and need to show the error to user. I am a newbie to angular. Please Help me

Here is my code.

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular-route.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular-messages.js"></script>
<div ng-app="Myapp">
    <div ng-controller="orderFormController">

        Item :   <input type="text" name="item"  ng-model='item' required> <p></p>
     Rate:   <input type="text" name="rate"  ng-model='rate' required> <p></p>

        <button type="button"  ng-click='saveorder()' >SAVE ORDER</button>
    </div>    
    <script>
        var Myapp = angular.module('Myapp', ["ngRoute"]);
        Myapp.controller('orderFormController', ['$scope', '$http', function ($scope, $http) {


            $scope.saveorder = function () {

                 // Validate form here and set the error in form

                 $http.post("order/save/", data).success(function (res, status, headers, config) {
                     $scope.message = res;

                }).error(function (data, status) { 
                    $scope.message = res;
                });
            }

        }]);
    </script>             

Answer 1

The very simple implementation could be done in a few steps:

1. Use <form> tag with a name attribute. Use saveorder in ng-submit attribute.
2. Create errors containers, and make their visibility to depend on errors: <span class="error" ng-show="form.item.$error.required ">

Final result should look like:

<div ng-controller="orderFormController">    
    <form name="form" ng-submit="saveorder()">
        Item :   <input type="text" name="item"  ng-model='item' required> <p></p>
        <span class="error" ng-show="form.item.$error.required"> Item field is required!</span>
        Rate:   <input type="text" name="rate"  ng-model='rate' required> <p></p>    
        <span class="error" ng-show="form.rate.$error.required"> Rate field is required!</span>
        <button type="button">SAVE ORDER</button>
    </form>    
</div>  

You can read Angular native documentation about form validation. More details are provided there.

Answer 2

Read this article.. https://scotch.io/tutorials/angularjs-form-validation

It explained it really well and and if still there are confusions , ask about those after putting some effort.

Answer 3

you should use angular form validation for that or for custom validation use

 var Myapp = angular.module('Myapp', ["ngRoute"]); Myapp.controller('orderFormController', ['$scope', '$http', function($scope, $http) { $scope.formdata = {}; $scope.saveorder = function(formdata) { $scope.error = ''; // Validate form here and set the error in form if (angular.isUndefined(formdata.item) == true || angular.isUndefined(formdata.rate) == true) { $scope.error = "Both Item and Rate are required." return false; } else { $scope.error = ''; } $http.post("order/save/", formdata).success(function(res, status, headers, config) { $scope.message = res; }).error(function(status, res) { $scope.message = res; }); } }]);

 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular-route.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular-messages.js"></script> <div ng-app="Myapp"> <div ng-controller="orderFormController"> <span style="color:red">{{error}}</span><br> Item : <input type="text" name="item" ng-model='formdata.item' required> <p></p> Rate: <input type="text" name="rate" ng-model='formdata.rate' required> <p></p> <button type="button" ng-click='saveorder(formdata)' >SAVE ORDER</button> </div>