时间:2021-01-03 15:34:01 | 栏目:AngularJS | 点击:次
Angular中的ng-messages提供了更方便的表单数据验证服务。
本文代码主要基于《AngularJS权威教程》中关于ng-messages模块的说明,但原文中不乏错误以及没有后台代码和示例,所以简单的实现其功能。//别的地方也有错误,我一度怀疑我买了盗版书==
比如我们想与后台进行表单数据合法性验证并给出输入操作提示
HTML代码:
<!DOCTYPE html> <html lang="en" ng-app="app"> <head> <meta charset="UTF-8"> <title>Document</title> <script src="angular.js"></script> <script src="angular-messages.js"></script> <script> angular.module("app", ["ngMessages"]) .directive("ensureUnique", function($http) { return { require: "?^ngModel", //原文中混用了ngModel和ctrl,这里统一使用ngModel,意指ngModelController link: function(scope, element, attrs, ngModel) { var url = attrs.ensureUnique; if (!ngModel) { return false; } ngModel.$parsers.push(function(val) { if (!val || val.length == 0) { return false; } //设置表单状态,属性统一归于signup_form.username.$error中,这是为设置是否合法状态,所以如果设置为false,则会在ng-messages中显示,因为它调用的是$error方法,意为是否“不合法”,原文有错误。 ngModel.$setValidity("checkingAvailability", false); ngModel.$setValidity("usernameAvailability", true); $http({ method: "POST", url: url, data: { username: val } }).then(function(r) { if ("exist" == r.data) { ngModel.$setValidity("checkingAvailability", true); ngModel.$setValidity("usernameAvailability", false); } else { ngModel.$setValidity("checkingAvailability", true); ngModel.$setValidity("usernameAvailability", true); } }, function(e) { console.log(e); }) return val; }) } } }) .controller("MainController", function($scope) { $scope.signup = { username: "" } }) </script> </head> <body> <div ng-controller="MainController"> <form name="signup_form" novalidate ng-submit="signupForm()"> <!-- 原文中指令放在了form元素中,应该放在input元素中 --> <input type="text" name="username" ng-model="signup.username" required ng-min-length=3 ng-max-length=10 ensure-unique="check.php"> <!-- 输入过才显示操作信息 --> <div class="error" ng-show="signup_form.$dirty" ng-messages="signup_form.username.$error" ng-messages-multiple> <div ng-message="required"> Required!!! </div> <div ng-message="checkingAvailability"> Checking... </div> <div ng-message="usernameAvailability"> Has been taken, please choose another. </div> </div> <div> <button type="submit">Submit</button> </div> <p>{{signup_form.username.$error}}</p> </form> </div> </body> </html>
PHP代码:
<?php //Angular与jQuery传递参数类型不同,不能直接使用$.POST['username']获取; $postData = file_get_contents('php://input', true); $obj=json_decode($postData); //这里模拟唯一性验证 if($obj->username == '123'){ echo "exist"; } else{ echo "available"; } ?>
效果: