我正在尝试在我的 Django 应用程序中使用Material Bootstrap Alert 。如果用户在尝试登录页面时输入了错误的密码或用户名，错误消息应该会出现在右上角。使用 js alert 它工作得非常好，但是当我试图调用时，toastr.error('Wrong login credentials. Please, try again...');我得到了这些错误：
jQuery.Deferred 异常：未定义 toastr @ http://127.0.0.1:8000/login/:63:9 j@ http://127.0.0.1:8000/static/js/jquery-3.2.1.min。 js:2:29997 g/http://127.0.0.1:8000/static/js/jquery-3.2.1.min.js:2:30313 未定义
ReferenceError: toastr 未定义
这是我的 login.html 页面：
{% extends 'utas/template.html' %}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>{% block title %}Login{% endblock %}</title>
</head>
<body>
{% block pagecontent %}
<div class="container">
<!-- Begin Form login -->
<form method="post" class="mt-5" style="width: 24rem; margin: 0 auto;">
{% csrf_token %}
<p class="h5 text-center mb-4">Sign in</p>
<div class="md-form">
<i class="fa prefix material-icons grey-text">account_circle</i>
<input type="text" id="defaultForm-user" class="form-control" name="username"
required
oninvalid="this.setCustomValidity('Username is required!')"
oninput="setCustomValidity('')">
<label for="defaultForm-user">Your username</label>
</div>
<div class="md-form">
<i class="fa prefix material-icons grey-text">lock</i>
<input type="password" id="defaultForm-pass" class="form-control" name="password"
required
oninvalid="this.setCustomValidity('Password is required!')"
oninput="setCustomValidity('')">
<label for="defaultForm-pass">Your password</label>
</div>
<div class="text-center">
<button type="submit" class="btn btn-default">Login</button>
</div>
</form>
<!-- End Form login -->
</div>
{% endblock %}
{% block script %}
{% if form.errors %}
<script type='text/javascript'>
$(document).ready(function()
{
toastr.error('Wrong login credentials. Please, try again...');
});
</script>
{%endif%}
{% endblock %}
</body>
</html>
这是我的 template.html 和所需的脚本：
{% load static %}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>UTAS - {% block title %}{% endblock %} </title>
<!-- Material Icons -->
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<!-- Bootstrap core CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">
<!-- Material Design Bootstrap -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.4.1/css/mdb.min.css" rel="stylesheet">
<!-- Custom styles -->
<link href="{% static 'css/style.css'%}" rel="stylesheet">
</head>
<body>
{% block pagecontent %}
{% endblock %}
</body>
<script src="{% static 'js/jquery-3.2.1.min.js'%}"></script>
<script src="{% static 'js/popper.min.js'%}"></script>
<script src="{% static 'js/bootstrap.min.js'%}"></script>
<script src="{% static 'js/mdb.min.js'%}"></script>
{% block script %}
{% endblock %}
</html>
我对 JS 或 jQuery 不是很有经验。所有 javascript 文件均来自官方 MDB 网站。