Laravel 4下拉列表

Question

I've made a drop down list that takes 'destination-from' values on 'oneways' table from the database. Following this tutorial here: http://www.laravel-tricks.com/tricks/easy-dropdowns-with-eloquents-lists-method

But whenever I try to run it, It gives me this kind of error: Undefined variable: categories What seems to be the problem here? I am really new to this. A newbie on laravel.

Here are my codes:

onewayflight.blade.php

  $categories = Category::lists('destination-from', 'title');
      {{ Form::select('category', $categories) }}

onewayflightcontroller.php

  public function onewayflightresults()
{
  return View::make('content.onewayflight');

  $list = DB::table('oneways');
  $listname = Oneways::lists('destination-from');

  $content = View::make('content.onewayflight', array('list'=>$list, 'listname'=>$listname));
}

I am not really sure of what I have left out one this. And I am also wondering if the model has something to do with this?

Answer 1

The code in your template where you are fetching the categories needs to be surrounded by PHP tags otherwise it won't be executed. But better still - move it to your controller which is where it belongs.

Also in your controller you return the view at the top of your onewayflight() - nothing after this will be executed.

So change it work work like this and you should be ok:

onewayflight.blade.php

{{ Form::select('category', $categories) }}

onewayflightcontroller.php

 public function onewayflight()
 {
    $categories = Category::lists('destination-from', 'title'); 

    return View::make('content.onewayflight', array('categories' => $categories));
  }

Also, in routes.php the route should look like this:

Route::get('/your-route-path', [
    'as' => 'your_route_name',
    'uses' => 'onewayflightcontroller@onewayflight'
]);

Answer 2

Additionally to @jd182 's advice (as I lack the reputation to comment, I use answer); are you sure that lists() function/facade returns some value other than null . PHP, sometimes, considers null values as undefined.

And your blade syntax is wrong. if you want to define a variable inside a blade file (which is not advised) you should wrap it around tag and work it as a regular php file.