Php Laravel 8尝试分配属性时出错“；plateno“；论空
我目前正在构建一个页面，使用HTML表单将行插入到数据库表中。我已经创建了模型、控制器、路由和web视图文件。但是，它返回了一个错误，该错误为Php Laravel 8尝试分配属性时出错“；plateno“；论空,php,html,laravel,laravel-8,Php,Html,Laravel,Laravel 8,我目前正在构建一个页面，使用HTML表单将行插入到数据库表中。我已经创建了模型、控制器、路由和web视图文件。但是，它返回了一个错误，该错误为 Error Attempt to assign property "plateno" on null 这是我的档案： resources\views\application.blade.php <!DOCTYPE html> <html lang="en"> <head>
Error
Attempt to assign property "plateno" on null
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/1000hz-bootstrap-validator/0.11.5/validator.min.js"></script>
<link href="{{ asset('css/user.css') }}" rel="stylesheet">
<title>Application</title>
</head>
<body>
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<img src="{{ asset('css/logo.png') }}">
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<!-- <li class="active"><a href="#"> Home</a></li>
<li><a href="#">Applications</a></li>
<li><a href="#">Status</a></li> -->
</ul>
<ul class="nav navbar-nav navbar-right">
<li>
<a href="{{ route('userprofile') }}">Profile</a>
</li>
<form method="POST" action="{{ route('logout') }}">
@csrf
<li>
<x-responsive-nav-link :href="route('logout')" style="color:white"
onclick="event.preventDefault();
this.closest('form').submit();">
<span class="glyphicon glyphicon-log-out">{{ __('Logout') }}</span>
</x-responsive-nav-link>
</li>
</form>
</ul>
</div>
</div>
</nav>
<div class="container-fluid text-center">
<div class="row content">
<div class="col-sm-2 sidenav">
<nav id="sidebar">
<ul class="list-unstyled components" >
<li >
<a href="{{ route('dashboard') }}">Home</a>
</li>
<li class="active">
<a href="#" data-toggle="collapse" aria-expanded="false">Application</a>
</li>
<li>
<a href="{{ route('status') }}">Status</a>
</li>
</ul>
</nav>
</div>
<div class="col-sm-8 text-left">
<h4>Particulars of Applicant</h4>
<p>Please check your details </p>
<div class="container">
<div class="form-group">
<div class="col-md-6">
<label for="name">Name:</label>
<div class="font-medium text-base text-gray-800">{{ Auth::user()->name }}</div>
<br>
</div>
<div class="col-md-6">
<label for="email">Email:</label>
<div class="font-medium text-sm text-gray-500">{{ Auth::user()->email }}</div>
<br>
</div>
<div class="col-md-6">
<label for="typeUser">Student / Staff</label>
<div class="font-medium text-sm text-gray-500">{{ Auth::user()->type }}</div>
<br>
</div>
<div class="col-md-6">
<label for="Phone">Phone Number:</label>
<div class="font-medium text-sm text-gray-500">{{ Auth::user()->phone }}</div>
<br>
</div>
</div>
</div>
<hr>
<div class="container-left">
<form method="POST" action="/application">
@csrf
<div class="form-group col-md-6">
<h4>Particulars of Vehicle 1</h4>
<br>
<label for="plateno">Vehicle Registration Number:</label>
<input id="plateno" class="form-control form-control-sm" type="text" name="name" placeholder="Vehicle Registration Number" :value="old('plateno')" required autofocus>
<br>
<label for="colour">Colour(Vehicle):</label>
<input id="colour" class="form-control form-control-sm" type="text" name="colour" placeholder="Vehicle colour" :value="old('colour')" required autofocus>
<br>
<label for="type">Type of vehicle</label>
<input id="type" class="form-control form-control-sm" type="text" name="type" placeholder="Motorcycle / Car" :value="old('type')" required autofocus>
<br>
<label for="brand">Brand of vehicle</label>
<input id="brand" class="form-control form-control-sm" type="text" name="brand" placeholder="Brand, Eg : Honda" :value="old('brand')" required autofocus>
<br>
<label for="model">Model of vehicle</label>
<input id="model" class="form-control form-control-sm" type="text" name="model" placeholder="Model, Eg : EX5" :value="old('model')" required autofocus>
</div>
<p>*Please recheck your vehicle details</p>
<hr>
<div class="needs-validation">
<div class="form-group">
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="invalidCheck" required>
<label class="form-check-label" for="invalidCheck">
Agree to terms and conditions
</label>
<div class="invalid-feedback">
You must agree before submitting.
</div>
</div>
<button type="submit" class="btn btn-default" style="background-color: #003D7B; color:white">Submit</button>
</div>
</div>
</form>
</div>
<hr>
</div>
</div>
</div>
<footer class="container-fluid text-center">
<p>Copyright 2020 | Developed By IIUMVeRS</p>
</footer>
</body>
</html>
应用
-
@csrf
-
{{{{（'Logout'）}
-
-
-
申请人详情
请检查您的详细信息
姓名：
{{Auth:：user（）->name}
电邮：
{{Auth:：user（）->email}
学生/教职员
{{Auth:：user（）->type}
电话号码：
{{Auth:：user（）->phone}
@csrf
车辆详情1
车辆登记号码：
颜色（车辆）：
车辆类型
汽车品牌
车辆模型
*请重新检查您的车辆详细信息
同意条款和条件
提交前必须同意。
提交
版权2020 |由IIUMVeRS开发
<?php
use Illuminate\Support\Facades\Route;
use App\Http\Controllers\UpdateDatabaseController;
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/
Route::get('/', function () {
return view('welcome');
});
//auth route for both
Route::group(['middleware' => ['auth']], function() {
Route::get('/dashboard', 'App\Http\Controllers\DashboardController@index')->name('dashboard');
});
// for users
Route::group(['middleware' => ['auth', 'role:user']], function() {
Route::get('/dashboard/myprofile', 'App\Http\Controllers\DashboardController@myprofile')->name('dashboard.myprofile');
});
//User's Application
Route::get('/application', function () {
return view('application');
})->middleware(['auth', 'role:user'])->name('application');
Route::post('/application', [UpdateDatabaseController::class, 'update']);
//User's Status
Route::get('/status', function () {
return view('status');
})->middleware(['auth', 'role:user'])->name('status');
//User's Profile
Route::get('/userprofile', function () {
return view('userprofile');
})->middleware(['auth', 'role:user'])->name('userprofile');
//Admin's Profile
Route::get('/adminprofile', function () {
return view('adminprofile');
})->middleware(['auth', 'role:admin'])->name('adminprofile');
//Admin Application Record
Route::get('/records', function () {
return view('records');
})->middleware(['auth', 'role:admin'])->name('records');
//Admin Application Approval
Route::get('/approval', function () {
return view('approval');
})->middleware(['auth', 'role:admin'])->name('approval');
require __DIR__.'/auth.php';
在应用程序.blade.php
文件中，您忘记更改palteno输入标记上的名称属性。因此，替换这一行：
<input id="plateno" class="form-control form-control-sm" type="text" name="name" placeholder="Vehicle Registration Number" :value="old('plateno')" required autofocus>
首先更改输入元素的名称
<label for="plateno">Vehicle Registration Number:</label>
<input id="plateno" class="form-control form-control-sm" type="text" name="plateno" placeholder="Vehicle Registration Number" :value="old('plateno')" required autofocus>
$data=Vehicle:：find（$request->id）
数据变量为空，您可能没有正确提交id这是因为在执行查询时未找到记录，因此$data变量为空，但错误不在该行，它在UpdateDatabaseController.php的第18行：$data->plateno=$request->plateno它仍然无法工作它返回相同的错误错误尝试在null上分配属性“plateno”
我忘了说你应该验证$request！我已经更新了答案问题是$data
为空，所以请检查并调试$request->id
。
<input id="plateno" class="form-control form-control-sm" type="text" name="name" placeholder="Vehicle Registration Number" :value="old('plateno')" required autofocus>
<input id="plateno" class="form-control form-control-sm" type="text" name="plateno" placeholder="Vehicle Registration Number" :value="old('plateno')" required autofocus>
if (!$data){
abort(404);
}
<label for="plateno">Vehicle Registration Number:</label>
<input id="plateno" class="form-control form-control-sm" type="text" name="plateno" placeholder="Vehicle Registration Number" :value="old('plateno')" required autofocus>
<input hidden name="id" value="{{$item->id}}">
$data= Vehicle::find($request->get('id'));
$data->plateno=$request->get('plateno');
$data->type=$request->get('type');
$data->colour=$request->get('colour');
$data->brand=$request->get('brand');
$data->model=$request->get('model');
$data->save();