在laravel 5.4中选择下拉列表的选定值 [英] Select Selected value of a dropdown in laravel 5.4

问题描述

我有一个称为名称的下拉列表，用户将在其中选择一个，提交后，如果出现错误，那么我想选择所选的名称.

I have a dropdown called designation, where a user will select one of it, and after submitting it, if there is some error then I want to select the selected designation.

我在laravel 5.4中使用它.

I am using this in laravel 5.4.

控制器

$info = DB::table("designation")
                    ->where('status','=',1)
                    ->pluck("name","id");

        return view('regUser.add',['check' => 'userList','designation' => $info]);

查看文件

<div class="form-group {{ $errors->has('designation') ? ' has-error' : '' }}">
                            <label for="designation">Designation</label>
                            <select id="designation" name="designation" class="form-control">
                                <option value="">--- Select designation ---</option>
                                @foreach ($designation as $key => $value)

                                    <option value="{{ $key }}" />{{ $value }}</option>
                                @endforeach
                            </select>
                            @if ($errors->has('designation'))
                            <span class="help-block">
                                <strong>{{ $errors->first('designation') }}</strong>
                            </span>
                            @endif  
                        </div>

现在，如果验证器发现一些错误，那么我想选择先前选择的一个. 我如何在laravel 5.4中实现这一目标.

Now if the validator found some error then I want to select the previously selected one. How can i achive this in laravel 5.4.

提交表单后，它会进入 addUserInformation 函数，在此函数中我将验证具有此代码段的用户信息

After submiting the form it comes to addUserInformation function, where I validate the user information which have this piece of code

 public function addUserInformation(Request $request){
            $this->validate($request, [
                'name' => 'required|string|min:5',
                'email' => 'required|string|email|unique:users,email',
                'designation' => 'required|exists:designation,id',
                'password'     => 'required|min:6',
                'confirm_password' => 'required|same:password',
                'userimage' => 'required|image',
            ]);
            $selectedID = $request->input('designation');
}

推荐答案

Larvel在验证错误时将输入传递回去.您可以使用old辅助函数来获取form的先前值.一个简单的比较就可以解决问题.

Larvel passes the inputs back on validation errors. You can use the old helper function to get the previous values of form. A simple comparison should do the trick.

<div class="form-group {{ $errors->has('designation') ? ' has-error' : '' }}">
    <label for="designation">Designation</label>
    <select id="designation" name="designation" class="form-control">
        <option value="">--- Select designation ---</option>
        @foreach ($designation as $key => $value)
            <option value="{{ $key }}" {{ old('designation') == $key ? 'selected' : ''}}>{{ $value }}</option>
        @endforeach
    </select>
    @if ($errors->has('designation'))
        <span class="help-block">
            <strong>{{ $errors->first('designation') }}</strong>
        </span>
    @endif
</div>

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