我正在尝试制作两个下拉菜单。这些是从我的数据库中选择的国家和州。我的问题是不知道如何制定国家必须依赖国家的条件。当我选择 [countryname] 时，它会在我的下拉列表中提供不同的州名称选择。到目前为止，这里是我到目前为止所做的。

AdminController.php

public function user_register()
    {
        $countryname = DB::table('countries')
            ->get();
        $statename = DB::table('states')
            ->get();

        $title = ucwords(Lang::get('constants.user') . ' ' . Lang::get('constants.register')); 
        return View::make('register.user_register')
            ->with('title', $title)
            ->with('page', 'user_register')
            ->with('countryname', $countryname)
            ->with('statename', $statename)
    }

user_register.blade.php

<select class="form-control" id="countries" name="countries">
    <option value="">Please select</option>
        <?php foreach ($countryname as $key=>$countryname): ?>
        <option value="<?php echo $countryname->sortname; ?>"<?php
         if (isset($countries) && Input::old('countries') == $countryname->sortname) 
         {
             echo 'selected="selected"';
         }
         ?>>
         <?php  echo $countryname->sortname ." - ". $countryname->name  ; ?>
    </option>
    <?php endforeach; ?>
</select>


<select class="form-control" id="states" name="states">
    <option value="">Please select</option>
        <?php foreach ($statename as $key=>$statename): ?>
        <option value="<?php echo $countryname->name; ?>" <?php
        if (isset($states) && Input::old('states') == $statename->name)
        {
            echo 'selected="selected"';
        }
        ?>>
        <?php  echo $statename->name; ?></option>
        <?php endforeach; ?>
</select>

在我的数据库中

表格:国家/地区

+-----------+--------------+------+-----+---------+----------------+
| Field     | Type         | Null | Key | Default | Extra          |
+-----------+--------------+------+-----+---------+----------------+
| country_id| int(11)      | NO   | PRI | NULL    | auto_increment |
| sortname  | varchar(3)   | NO   |     | NULL    |                |
| name      | varchar(150) | NO   |     | NULL    |                |
| phonecode | int(11)      | NO   |     | NULL    |                |
+-----------+--------------+------+-----+---------+----------------+

表:状态

+------------+------------------+------+-----+---------+----------------+
| Field      | Type             | Null | Key | Default | Extra          |
+------------+------------------+------+-----+---------+----------------+
| id         | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| name       | varchar(255)     | NO   |     | NULL    |                |
| country_id | int(11)          | NO   |     | NULL    |                |
+------------+------------------+------+-----+---------+----------------+

最佳答案

以下是在 Laravel 中进行动态下拉的方法:

You can see a demo of how it works here https://www.dronejobs.co/

免责声明:我没有对此进行测试，但它应该可以工作。欢迎大家评论，我会更新?

app/Http/Controllers/HomeController.php

<?php

namespace App\Http\Controllers;

use App\{Country, State};

class HomeController extends Controller
{
    public function index()
    {
        return view('home', [
            'countries' => Country::all(),
            'states' => State::all(),
        ]);
    }
}

resources/views/home.blade.php

<select name="country">
    @foreach ($countries as $country)
        <option value="{{ $country->id }}">{{ $country->name }}</option>
    @endforeach
</select>

<select name=“state”>
    @foreach ($states as $state)
        <option value="{{ $state->id }}">{{ $state->name }}</option>
    @endforeach
</select>

<script>
    $(function() {
        $('select[name=country]').change(function() {

            var url = '{{ url('country') }}' + $(this).val() + '/states/';

            $.get(url, function(data) {
                var select = $('form select[name= state]');

                select.empty();

                $.each(data,function(key, value) {
                    select.append('<option value=' + value.id + '>' + value.name + '</option>');
                });
            });
        });
    });
</script>

应用程序/Country.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Country extends Model
{   
    public function states()
    {
        return $this->hasMany('App\State');
    }

应用程序/State.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

Class State extends Model
{   
    public function country()
    {
        return $this->belongsTo('App\Country');
    }

routes/web.php

Route::get('country/{country}/states', 'CountryController@getStates');

app/Http/Controllers/CountryController.php

<?php

namespace App\Http\Controllers;

use App\Country;

class CountryController extends Controller
{
    public function getStates(Country $country)
    {
        return $country->states()->select('id', 'name')->get();
    }
}

关于php - Laravel 动态下拉国家和州，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45060108/