How to make simple dynamic drop list in Laravel? - php

Question

I'm new at Laravel and not good with syntax. I have seen many tutorials and have read many answers, but still, my mind didn't get the point of how can I have a dropdown field for a foreign key.
I'm having one table "Section" and other "Class." I want to show the name of classes in section page.
Sections Migration
Schema::create('sections', function (Blueprint $table) {
$table->increments('id');
$table->string('title');
$table->integer('class_id')->unsigned();
$table->foreign('class_id')->references('id')->on('classses');
});
Classses Migration
Schema::create('classses', function (Blueprint $table) {
$table->increments('id');
$table->string('title');
$table->timestamps();
});
Honestly, I don't know if I should have changed my controller or not.
Blade/View
<div class="form-group">
<label for="name">Name</label>
<input type="text" class="form-control" name="name" id="title">
</div>
<div class="form-group">
<label for="cid">Class</label>
???????????????
</div>
Index Function
public function index()
{ $sections = Section::all();
return view('sections.index', compact('sections'));
$classs = Classs::all()->pluck(['id', 'title']);
return view('sections.index')->with('classs', $classs); }
Error is Unreachable Statement at line $class & Expected string, got array at ([id,'title])

Answer 1

In your controller, you have a function to return the view.
Change it to include ->with(), so you can access the classes in the view:
// if the controller is not for the classes, add this up top:
use App\Classs; // include model name
$classs = Classs:all();
return view('yourView')->with('classe', $classs);
Then, in your view, you can just do this:
<div class="form-group">
<label for="cid">Class</label>
<select class="" name="cid">
<option value="null">Class</option>
#foreach($classs as $class)
<option value="{{$class->id}}">{{$class->title}}</option>
#endforeach
</select>
</div>
It loops over all the classes in your database and creates a <option> element for them. Looking at your first migration, you're using the id in the other table, so you need to set that as the value.
Change your index function to this:
public function index()
{
$sections = Section::all();
$classs = Class::all();
return view('sections.index')->with('sections', $sections)->with('classs', $classs);
}
Can you tell me where can I write conditions such as select * from class where role_id=2 etc.
Basically, in an MVC framework, you do all your queries in your controller and pass the data to the view, in which you display the data.
Laravel has a DB class which you can use for basic queries:
select * from class where role_id = 2
Would become this in Laravel, using the DB class.
DB::table('class')->where('role_id', 2)->get();
// or if it's a model:
Model::where('role_id', 2)->get();

Answer 2

I have now used this code in blade page
#php
use Illuminate\Support\Facades\DB;
$cid=DB::table('classses')->get();
$uid=DB::table('users')->where('role_id','3')->get();
$counter=0;
#endphp
<select class="" name="class_id">
<option value="null">Class</option>
#foreach($cid as $class)
#if($counter==0)
<option selected="selected" value="{{$class->id}}">{{$class->title}}</option>
{{$counter++}}
#else
<option value="{{$class->id}}">{{$class->title}}</option>
#endif
#endforeach
</select>