Angularjs provides form validation functionality. Although it is not as good as the verification methods of other frameworks. But I personally think it is more flexible than other verification frameworks. Not simply by setting properties to achieve.
The ng-show property can control the showing and hiding of a label.
An example with the help of a rookie tutorial is as follows:
We can also specify multiple error messages by [$error.validation name].
Where $error.required is required to enter authentication information. The required attribute when used on the label is HTML5 form validation.
Similarly, the input box of type="email" is also an HTML5 form validation. And ng-maxlength/ng-minlength uses instruction validation.
That is to say, the validation of angularjs is combined with the HTML5 form validation specification.
code show as below;
Then we put the defined directive on the label. Display control of error information through $error.phone.
The ng-show property can control the showing and hiding of a label.
An example with the help of a rookie tutorial is as follows:
<input type="checkbox" ng-model="myVar"> <div ng-show="myVar"> <h1>Welcome</h1> <p>Welcome to my home.</p> </div>
When the checkbox is checked, the div content is displayed. Instead, hide.
Passing validation is controlled by ng-show set on the label.
***.$touch&&****.$invalid is the condition to verify whether it is displayed.
*** is an element. Generally speaking, it is displayed when an element in the form is touched (which can be understood as a focus event) and the validation fails.
<input type="text" name="firstName" ng-model="user.firstName" required /> <span ng-show="myForm.firstName.$touched && myForm.firstName.$invalid" style="color:red;">First Name is required.</span>
We can also specify multiple error messages by [$error.validation name].
Email: <input type="email" name="myEmail" ng-model="myEmail" required /> <span ng-show="myForm.myEmail.$touched && myForm.myEmail.$invalid" style="color:red;"> <span ng-show="myForm.myEmail.$error.required">Email is required.</span> <span ng-show="myForm.myEmail.$error.email">Invalid email format.</span> </span>
Where $error.required is required to enter authentication information. The required attribute when used on the label is HTML5 form validation.
Similarly, the input box of type="email" is also an HTML5 form validation. And ng-maxlength/ng-minlength uses instruction validation.
That is to say, the validation of angularjs is combined with the HTML5 form validation specification.
code show as below;
Email: <input type="email" name="myEmail" ng-model="myEmail" required ng-maxlength="10" />
<span ng-show="myForm.myEmail.$touched && myForm.myEmail.$invalid" style="color:red;">
<span ng-show="myForm.myEmail.$error.required">Email is required.</span>
<span ng-show="myForm.myEmail.$error.email">Invalid email format.</span>
<span ng-show="myForm.myEmail.$error.maxlength">10max length</span>
</span>
We can also implement more free verification methods through custom instructions. In the following code we define a validation called phone and add it to the current controller.
//Use directives to customize form validation rules
myApp.directive("myValDirective", function() {
return {
require: "ngModel",
link: function(scope, element, attr, mCtrl) {
function myValidation(value) {
if (/^1[34578]\d{9}$/.test(value)) {
mCtrl.$setValidity('phone', true);
} else {
mCtrl.$setValidity('phone', false);
}
return value;
}
mCtrl.$parsers.push(myValidation);
}
};
});
Then we put the defined directive on the label. Display control of error information through $error.phone.
Phone: <input type="text" name="myPhone" ng-model="myPhone" required my-val-directive /> <span ng-show="myForm.myPhone.$touched && myForm.myPhone.$invalid" style="color:red;"> <span ng-show="myForm.myPhone.$error.required">Phone is required.</span> <span ng-show="myForm.myPhone.$error.phone">Invalid Phone format.</span> </span>The complete code above is as follows:
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<title>Form - AngularJS Test</title>
<style type="text/css">
.test-div {margin:15px;padding:15px;border:1px solid #ccc;}
input.ng-invalid {background-color:#FFFF00;}
</style>
</head>
<body>
<div class="test-div" ng-controller="myCtrl">
<form name="myForm" action="#" novalidate>
<p>
First Name: <input type="text" name="firstName" ng-model="user.firstName" required />
<span ng-show="myForm.firstName.$touched && myForm.firstName.$invalid" style="color:red;">First Name is required.</span>
</p>
<p>
Last Name: <input type="text" name="lastName" ng-model="user.lastName" required />
<span ng-show="myForm.lastName.$touched && myForm.lastName.$invalid" style="color:red;">Last Name is required.</span>
</p>
<p>
Email: <input type="email" name="myEmail" ng-model="myEmail" required ng-maxlength="10" />
<span ng-show="myForm.myEmail.$touched && myForm.myEmail.$invalid" style="color:red;">
<span ng-show="myForm.myEmail.$error.required">Email is required.</span>
<span ng-show="myForm.myEmail.$error.email">Invalid email format.</span>
<span ng-show="myForm.myEmail.$error.maxlength">10max length</span>
</span>
</p>
<p>
Phone: <input type="text" name="myPhone" ng-model="myPhone" required my-val-directive />
<span ng-show="myForm.myPhone.$touched && myForm.myPhone.$invalid" style="color:red;">
<span ng-show="myForm.myPhone.$error.required">Phone is required.</span>
<span ng-show="myForm.myPhone.$error.phone">Invalid Phone format.</span>
</span>
</p>
<button ng-click="resetForm()">Reset</button>
</form>
<p>form = {{user}}</p>
<p>origin = {{origin}}</p>
</div>
<script type="text/javascript" src="static/js/angular-1.5.8.js"></script>
<script type="text/javascript">
/**
* Forms in AngularJS provides data-binding and validation of input controls: input select button textarea.
* AngularJS offers client-side form validation.
*/
var myApp = angular.module("myApp", []);
//Use directives to customize form validation rules
myApp.directive("myValDirective", function() {
return {
require: "ngModel",
link: function(scope, element, attr, mCtrl) {
function myValidation(value) {
if (/^1[34578]\d{9}$/.test(value)) {
mCtrl.$setValidity('phone', true);
} else {
mCtrl.$setValidity('phone', false);
}
return value;
}
mCtrl.$parsers.push(myValidation);
}
};
});
myApp.controller("myCtrl", function($scope) {
$scope.origin = {"firstName":"Neo","lastName":"Huang"};
$scope.resetForm = function() {
$scope.user = angular.copy($scope.origin);
};
$scope.resetForm();
});
</script>
</body>
</html>