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我有以下代码进行表单验证。当我在文本框中输入一些值（脏）并且该值无效时，它会显示错误消息。但是，当我不做任何改变（原始）并点击提交时，错误消息不会显示。如何在这种情况下触发错误消息？当原始格式提交时，不会显示错误消息
注意：当我删除原始检查时，甚至在提交之前显示错误消息。
<!DOCTYPE html>
<html>
<head>
<!-- bootstrap -->
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
<style>
body{padding-top: 30px;}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.5.6/angular.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.5.6/angular-resource.js"></script>
<script type="text/JavaScript">
var myApp = angular.module('myApp', []);
myApp.controller('myController', function ($scope) {
//Call function on form submit
$scope.submitForm = function (isValid) {
if (isValid) {
alert('Valid');
}
else {
alert('Invalid');
}
};
});
</script>
</head>
<body ng-app="myApp" ng-controller="myController">
<div class="myDiv">
<div class="col-sm-8 col-sm-offset-2">
<div class="page-header">
<h1>Validation</h1>
</div>
<form name="userForm" ng-submit="submitForm(userForm.$valid)" novalidate>
<!-- Prevents HTML5 validation using novalidate-->
<div class="form-group" ng-class="{ 'has-error' : userForm.name.$invalid && !userForm.name.$pristine }">
<label>Name</label>
<input type="text" name="name" class="form-control" ng-model="user.name" required>
<p ng-show="userForm.name.$invalid && !userForm.name.$pristine" class="help-block">
Name required.</p>
</div>
<div class="form-group" ng-class="{ 'has-error' : userForm.location.$invalid && !userForm.location.$pristine }">
<label>Location</label>
<input type="text" name="location" class="form-control" ng-model="user.location"
ng-minlength="3" ng-maxlength="8">
<p ng-show="userForm.location.$error.minlength" class="help-block">
Location is less than min length.</p>
<p ng-show="userForm.location.$error.maxlength" class="help-block">
Location more than max length.</p>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
</div>
</body>
</html>