防止提交时默认:- Angularjs [英] prevent default on submit :- Angularjs

问题描述

如果填写表单时电子邮件为空，我想防止 http-post 的默认操作为/signUp".

I want to prevent-default action of http-post to '/signUp' if e-mail is null upon filling form.

控制器代码:-

$scope.signUp = function() {

  if($scope.email = null);
    preventdefault;

}

html(玉石):-

form(name="input", action="/signUp", method="post")
  input(type="submit", value="submit")

推荐答案

当你为表单指定了 action 属性时，angularjs 不会做 preventDefault.如果您删除它并添加 ng-submit :

When you have the action attribute specified for the form, angularjs will not do preventDefault. If you remove it and add ng-submit instead:

<form name="myForm" method="post" ng-submit="signUp(myForm)" novalidate>
    <input type="email" name="email" ng-model="newSignup.email" required>
    <button type="submit">sign up</button>
</form>

在这种情况下，表单将始终具有 preventDefault 并在提交时调用您的 $scope.signUp() 函数，您可以在其中继续向后端/signup 发送 ajax 帖子或进一步验证.请注意，通过在您的输入上使用正确的验证属性(例如 type="email" 和 required)，angularjs 将为您执行一些基本验证.您可以在提交按钮上添加一个额外的 ng-disabled="!myForm.$valid" 以在未正确输入电子邮件时保持按钮禁用.

In this case the form will always have preventDefault and on submit your $scope.signUp() function will be called where you can proceed with an ajax post to the backend /signup or further validation. Note that by using proper validation attributes on your inputs (like type="email" and required), angularjs will perform some basic validation for you. You can have an extra ng-disabled="!myForm.$valid" on the submit button to keep the button disabled while the email is not correctly entered.

通过在输入上使用 ng-model 就像在我的例子中一样，您的范围将获得一个 $scope.newSignup 对象，您可以检查您的 signUp() 函数以进行进一步验证:

By using ng-model on the inputs like in my example, your scope will get a $scope.newSignup object which you can check in your signUp() function for further validation:

$scope.signUp = function(htmlForm) {
    if ($scope.newSignup.email !== '[e-mail]') {
       return false;  // you should really show some info to the user
    }
    ...
}

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