Question

更改类别选择表单后，我无法选择子类别

public class LocaleTest extends JFrame {
    private static final long serialVersionUID = 1L;

    public LocaleTest() {
        super("test");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        getContentPane().setLayout(new BorderLayout());
        add(new MainPanel());

        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    private class MainPanel extends JPanel implements LocaleChangeable {
        private JLabel label;
        private JButton changeLocaleButton;

        public MainPanel() {
            super(new FlowLayout());
            label = new JLabel(Locale.ENGLISH.toString());
            add(label);

            changeLocaleButton = new JButton("Change Locale");
            changeLocaleButton.addActionListener(e -> {
                broadcastLocaleChange(Locale.CANADA);
            });
            add(changeLocaleButton);
        }

        @Override
        public void localeChanged(Locale newLocale) {
            label.setText(newLocale.toString());
            System.out.println("Language changed.");
        }

        private void broadcastLocaleChange(Locale locale) {
            List<Component> components = getChildren(Component.class, LocaleTest.this);
            components.stream().filter(LocaleChangeable.class::isInstance).map(LocaleChangeable.class::cast)
                    .forEach(lc -> lc.localeChanged(locale));
        }
    }

    private static <T extends Component> List<T> getChildren(Class<T> clazz, final Container container) {
        Component[] components;
        if (container instanceof JMenu)
            components = ((JMenu) container).getMenuComponents();
        else
            components = container.getComponents();
        List<T> compList = new ArrayList<T>();
        for (Component comp : components) {
            if (clazz.isAssignableFrom(comp.getClass())) {
                compList.add(clazz.cast(comp));
            }
            if (comp instanceof Container)
                compList.addAll(getChildren(clazz, (Container) comp));
        }
        return compList;
    }

    public static interface LocaleChangeable {
        void localeChanged(Locale newLocale);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new LocaleTest().setVisible(true));
    }
}

Answer 1

$.ajax({
           type:"GET",
            headers: {
           'X-CSRF-TOKEN': '{{ csrf_token() }}'
            },
           url:"{{url('get-categorie-list')}}?cat_id="+cat_id,

           dataType:"json",

Answer 2

文件wib.php

Route::get('get-categorie-list/{cat_id}','AnnonceController@getSubcatList');

html

<div class="form-group">
    <label for="cat" class="col-md-3 control-label">Catégorie</label>
    <div class="col-sm-6">
      <select name='categorie_id' class="form-control" id='categorie' placeholder = 'Sélectionner votre categorie'>
        <option>Sélectionner votre categorie</option>
       @foreach($categories as $categorie)
       <option value="{{ $categorie->id }}"> {{ $categorie->name }}</option>
       @endforeach
       </select>

    </div>

  </div> <!-- form-group // -->
  <div class="form-group">
    <label for="cat" class="col-md-3 control-label">Sous Catégorie</label>
    <div class="col-sm-6">
      <select name='subcategorie_id' class="form-control" id="subcategorie">


       </select>

    </div>

  </div> 
  <div class="form-group">

我的控制器：

namespace App\Http\Controllers;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\State;
use App\Categorie;
use App\SubCategorie;
use App\Http\Requests;

use DB;
class AnnonceController extends Controller
{

public function getSubcatList(Request $request)
    {


            $subcategories =SubCategorie::where('categorie_id','=',$request->cat_id)->get();
        return response()->json($subcategories);

    }

Laravel项目中使用AJAX的类别和子类别不起作用？

2 个答案: