Laravel : Search result search?page=2 show nothing, just blank page - php

Question

My pagination works correctly, but when use search component it display only first page of result.
My page URL without search looks like:
http://localhost:8000/dictionary-management/postcode?page=2
And it's work correctly.
My first page URL with search:
http://localhost:8000/dictionary-management/postcode/search
and it's work correctly.
My second page URL with search:
http://localhost:8000/dictionary-management/postcode/search?page=2
and the is nothing to show, only blank page.
This is my Controller Search method:
public function search(Request $request) {
$constraints = [
'postcode' => $request['postcode'],
'address' => $request['address']
];
$postcodes = $this->doSearchingQuery($constraints);
return view('dictionary-mgmt/postcode/index', ['postcodes' => $postcodes, 'searchingVals' => $constraints]);
}
private function doSearchingQuery($constraints) {
$query = Postcode::query();
$fields = array_keys($constraints);
$index = 0;
foreach ($constraints as $constraint) {
if ($constraint != null) {
$query = $query->where( $fields[$index], 'like', '%'.$constraint.'%');
}
$index++;
}
return $query->Paginate(5);
}
This is my route :
Route::resource('dictionary-management/postcode', 'PostCodeController');
Route::post('dictionary-management/postcode/search', PosstCodeController#search')->name('postcode.search');
This is my index view :
#extends('dictionary-mgmt.postcode.base')
#section('action-content')
<!-- Main content -->
<section class="content">
<div class="box">
<div class="box-header">
<div class="row">
<div class="col-sm-8">
<h3 class="box-title">List kodów pocztowych</h3>
</div>
<div class="col-sm-4">
<a class="btn btn-primary pull-right" href="{{ route('postcode.create') }}">Dodaj nowy kod pocztowy</a>
</div>
</div>
</div>
<!-- /.box-header -->
<div class="box-body">
<div class="row">
<div class="col-sm-6"></div>
<div class="col-sm-6"></div>
</div>
<form method="POST" action="{{ route('postcode.search') }}">
{{ csrf_field() }}
#component('layouts.search', ['title' => 'Szukaj'])
#component('layouts.two-cols-search-row', ['items' => ['postcode', 'address'], 'title' => ['Kod','Adres'],
'oldVals' => [isset($searchingVals) ? $searchingVals['postcode'] : '', isset($searchingVals) ? $searchingVals['address'] : '']])
#endcomponent
#endcomponent
</form>
<div id="example2_wrapper" class="dataTables_wrapper form-inline dt-bootstrap">
<div class="row">
<div class="col-sm-12">
<table id="example2" class="table table-bordered table-hover dataTable" role="grid" aria-describedby="example2_info">
<thead>
<tr role="row">
<th width="5%">Kod pocztowy</th>
<th width="40%">Adres</th>
<th width="10%">Miejscowość</th>
<th width="10%">Województwo</th>
<th width="10%">Powiat</th>
<th>Akcja</th>
</tr>
</thead>
<tbody>
#foreach ($postcodes as $postcode)
<tr role="row" class="odd">
<td>{{ $postcode->postcode }}</td>
<td>{{ $postcode->address }}</td>
<td>{{ $postcode->city }}</td>
<td>{{ $postcode->voivodeship }}</td>
<td>{{ $postcode->county }}</td>
<td>
<form class="row" method="POST" action="{{ route('postcode.destroy', ['id' => $postcode->id]) }}" onsubmit = "return confirm('Czy napewno usunąć?')">
<input type="hidden" name="_method" value="DELETE">
<input type="hidden" name="_token" value="{{ csrf_token() }}">
<a href="{{ route('postcode.edit', ['id' => $postcode->id]) }}" class="btn btn-warning col-sm-3 col-xs-5 btn-margin">
Edytuj
</a>
<button type="submit" class="btn btn-danger col-sm-3 col-xs-5 btn-margin">
Usuń
</button>
</form>
</td>
</tr>
#endforeach
</tbody>
<tfoot>
<tr>
<th width="5%">Kod pocztowy</th>
<th width="40%">Adres</th>
<th width="10%">Miejscowość</th>
<th width="10%">Województwo</th>
<th width="10%">Powiat</th>
<th>Akcja</th>
</tr>
</tfoot>
</table>
</div>
</div>
<div class="row">
<div class="col-sm-5">
</div>
<div class="col-sm-7">
<div class="dataTables_paginate paging_simple_numbers" id="example2_paginate">
{{ $postcodes->links() }}
</div>
</div>
</div>
</div>
</div>
<!-- /.box-body -->
</div>
</section>
<!-- /.content -->
</div>
#endsection
And this is my search component:
<div class="row">
#php
$index = 0;
#endphp
#foreach ($items as $item)
<div class="col-md-6">
<div class="form-group">
#php
$stringFormat = strtolower(str_replace(' ', '', $item));
#endphp
<label for="input<?=$stringFormat?>" class="col-sm-3 control-label">{{$title[$index]}}</label>
<div class="col-sm-9">
<input value="{{isset($oldVals) ? $oldVals[$index] : ''}}" type="text" class="form-control" name="<?=$stringFormat?>" id="input<?=$stringFormat?>" placeholder="{{$title[$index]}}">
</div>
</div>
</div>
#php
$index++;
#endphp
#endforeach
</div>
Please help, I don't know where is my mistake...

Answer 1

Try this
{{ $postcodes->appends(request()->input())->links()}}
instead of {{ $postcodes->links() }}