Form validation on ng-click angularjs

Question

I am unable to find a solution in the existing answers, hence i am posting this.

I have a form which has many input fields, many of them are required.

There

Answer 1

A very-very simple solution is to give the form a name so you can refer to it and then tweak the ng-click to fire only if the form is valid:

<form name="myform">
    <input type="text" ng-model='name' ng-required="true" />
    <button ng-click="myform.$valid && preview()">Preview</button>
    <button ng-click="myform.$valid && update()">Update</button>
</form>

Forked fiddle: https://jsfiddle.net/r8d1uq0L/

I like separating validation (a business concern) from the view, to that end I created egkyron that lets you define the model constraints in code and use programmatic validation along with standard Angular form validation.

Answer 2

You could set a flag so that you can show some kind of a required message or set some css class when the form is invalid.

var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.name=undefined;
    $scope.showMsgs = false;
    $scope.preview = function(form){
        if ($scope[form].$valid) {
            alert("Previewed");
        } else {
            $scope.showMsgs = true;
        }
    };
    $scope.update = function(form){
        if ($scope[form].$valid) {
            alert("Updated");
        } else {
            $scope.showMsgs = true;
        }    
    };
});

.error {
  border-color: red;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp" ng-controller="myCtrl">

    <form name="myform" novalidate ng-init="disabled=false">
        <p ng-show="showMsgs && myform.name.$error.required">This field is required</p>
        <input type="text" name="name" ng-model='name' ng-required="!disabled" ng-disabled="disabled" ng-class="{error: showMsgs && myform.name.$error.required}" />
        
        <button ng-click="preview('myform')">Preview</button>
        <button ng-click="update('myform')">Update</button>
        <button ng-click="disabled=!disabled">toggle disabled</button>
    </form>

</div>