Question

如果有人可以帮助我，我将无法从控制器获取变量。我正在使用PHP Laravel 5.7.2。

DetectController.php：

public function store(Request $request){
    if($request->input('Adult_Person') == "on") $checkboxPerson = 1;
    else $checkboxPerson = 0;
    if($request->input('Child') == "on") $checkboxChild = 1;
    else $checkboxChild = 0;

    $detect = \App\Detect::where('user_id', (int)auth()->user()->id);
            if( $detect == NULL ) true;
            else{ 
                $detect = $detect->where('user_id', (int)auth()->user()->id);
                $detect->delete();
                }
            $detect = new \App\Detect;
            $detect->user_id = (int)auth()->user()->id;
            $detect->checkbox_Adult_Person = $checkboxPerson;
            $detect->checkbox_Child = $checkboxChild;
            $detect->save();

            $detect_user[] = $checkboxPerson;
            $detect_user[] = $checkboxChild;

            return view('home',['data' => $detect_user ]);
            //return view('home', compact($detect_user)); //Dont work
            //return view('home')->with('data',$detect_user);  //Dont work

}

home.blade.php：

                    <form method="post" action="{{ route('detect.store') }}">
                    {!! csrf_field() !!}

                    <div class="custom-control custom-checkbox">
                        <input type="checkbox" class="custom-control-input" id="checkbox_Adult_Person" name="Adult_Person"    {{ $detect_user[0] ? "checked" : "" }} >
                        <label class="custom-control-label" for="checkbox_Adult_Person">Adult Person</label>
                    </div>
                    <div class="custom-control custom-checkbox">
                        <input type="checkbox" class="custom-control-input" id="checkbox_Child" name="Child"
                        {{ $detect_user[1] ? "checked" : "" }}>
                        <label class="custom-control-label" for="checkbox_Child">Child</label>
                    </div></form>

web.php

Route::resource('detect', 'DetectController');

错误：

ErrorException (E_ERROR) Undefined variable: detect_user (View: /var/www/html/laravel/test/resources/views/home.blade.php)

数据库已更新，但该变量未进入视图。有人可以帮忙吗，谢谢！

EDIT ：我尝试为此return view('home',['detect_user' => $detect_user ]);进行更改，但两者都不起作用。谢谢

解决方案：return view('home',['detect_user' => $detect_user ]);非常有用。但是我的问题是Undefined variable: detect_user，因为我的类Detect没有视图，很显然，当有人调用视图时，首先运行index函数的代码，因此在主视图代码中，我只创建了Detect Object并放入数据库中的数据，因此用户可以观看和编辑以前保存的数据。

代码，也许可以帮助某人：

    public function index()
    {

        $detects = \App\Detect::all();

        for( $i = 0; $i < count($detects); $i++ )
            if( (int)$detects[$i]->user_id == (int)auth()->user()->id )  {

                $detect = new \App\Detect;
                $detect->user_id = (int)auth()->user()->id;
                $detect->checkbox_Adult_Person = $detects[$i]->checkbox_Adult_Person;
                $detect->checkbox_Child = $detects[$i]->checkbox_Child;
                $detect->checkbox_Gun  = $detects[$i]->checkbox_Gun;
                $detect->checkbox_knife  = $detects[$i]->checkbox_knife;
                $detect->checkbox_Fire  = $detects[$i]->checkbox_Fire;
                $detect->checkbox_Rain  = $detects[$i]->checkbox_Rain;            
                $detect->checkbox_Dog  = $detects[$i]->checkbox_Dog;
                $detect->checkbox_Cat  = $detects[$i]->checkbox_Cat;
                $detect->checkbox_Bird  = $detects[$i]->checkbox_Bird;             
                $detect->checkbox_Violence  = $detects[$i]->checkbox_Violence;
                $detect->checkbox_Blood = $detects[$i]->checkbox_Blood;      

                return view('home', ['detect' => $detect]);
              }
   }

刀片文件如下所示：

        <form method="post" action="{{ route('home.store') }}">
                {!! csrf_field() !!}
                <div class="custom-control custom-checkbox">
                    <input type="checkbox" class="custom-control-input" id="checkbox_Adult_Person" name="Adult_Person" 
                    {{ $detect->checkbox_Adult_Person == 1 ? "checked" : "" }} 
                    >
                    <label class="custom-control-label" for="checkbox_Adult_Person">Adult Person</label>
                </div>
                <div class="custom-control custom-checkbox">
                    <input type="checkbox" class="custom-control-input" id="checkbox_Child" name="Child"
                    {{ $detect->checkbox_Child == 1 ? "checked" : "" }} 
                    >
                    <label class="custom-control-label" for="checkbox_Child">Child</label>

Answer 1

当您将数据从控制器传递到变量名数据时，您将在$ data变量中获取数据，return view('home',['data' => $detect_user ]);将数组键命名为数据，因此必须从视图中调用诸如$ data [0]之类的所有内容，更改阵列键名称或将变量名称更改为刀片文件中的$ data

Answer 2

return view（'home'，['data'=> $ detect_user]）; 改成 return view（'home'，['detect_user'=> $ detect_user]）;

Answer 3

将return view('home',['data' => $detect_user ]);替换为：

return view('home',['detect_user' => $detect_user ]);

如果您希望在视图中拥有更多“数据”，可以执行以下操作：

$data['detect_user'] = $detect_user;
$data['otherdata'] = $otherData;
$data['andanotherdata'] = $andanotherdata;
return view('home',['data => $data ]);

并在您的视图中访问$detect_user，$otherData和$andanotherdata。

Laravel 5.7.2 View中的未定义变量

3 个答案: