如何在Laravel中对通过AJAX呈现的数据表进行分页？

Question

I am trying to render a Blade template in Laravel that contains an HTML table with data obtained via AJAX, and need to manually paginate the results using Laravel's LengthAwarePaginator.

I have a main blade file called reports.blade.php which contains an AJAX call to a controller method called SalesController@get_sales_forecast. Within that controller, I am fetching some data from a MSSQL database and rendering a partial view called sales-forecast-table that puts the data in an HTML table. That is all working successfully.

However, I am now trying to paginate those results because the data set is very large.

In my main blade file (reports.blade.php), the AJAX call looks like this:

$.ajax({
   type: 'POST',
   url:'{{action('SalesController@get_sales_forecast')}}',
   data: {
         _token: $('meta[name="_token"]').attr('content'),
         start_date: $('#txtStartDate').val(),
         end_date: $('#txtEndDate').val()
  },
  success:function(data) {
         $('#table-sales-forecast').html(data.html);
  }
});

Furthermore, reports.blade.php includes a partial view:

<div class="table-responsive" id="table-part-forecast-annual">
    @include('sales-forecast-table')
</div>

The AJAX call goes out to SalesController@get_sales_forecast, which looks like this:

public function get_sales_forecast(Request $request) {

        //Get data from Sales model
        $sales_forecast = Sales::getSalesForecast($start_date, $end_date);

        //Get current page
        $current_page = LengthAwarePaginator::resolveCurrentPage();

        //Create new collection
        $item_collection = collect($sales_forecast);

        //Define how many items to show per page
        $page_limit = 25;

        //Slice the collection to get the items to display in current page
        $current_page_items = $item_collection->slice(($current_page * $page_limit) - $page_limit, $page_limit)->all();

        //Create paginator 
        $paginated_items = new LengthAwarePaginator($current_page_items, count($item_collection), $page_limit);

        //Set URL path for generated links
        $paginated_items->withPath($request->url());

        //Render the view as an HTML string
        $html = view('sales-forecast-table')->with(['sales_forecast' => $paginated_items])->render();

        //Return the HTML 
        return response()->json(compact('html'));
    }

And the view being rendered from the AJAX call (sales-forecast-table.blade.php) looks like this:

@if(isset($sales_forecast))
    {!!$sales_forecast->links()!!}
    <table class='table table-hover table-striped table-bordered'>
        @foreach($sales_forecast as $record)
            <tr>
                <td>{{$record->id}}</td>
                <td>{{$record->location}}</td>
                <td>{!!$record->customer!!}</td>
                <td>{!!$record->forecast!!}</td>
        @endforeach
    </table>
@endif

At this point, the table does render and the page links even appear. The table only displays the first 25 rows as expected (per the $page_limit = 25 line) with page 1 selected, but when I click on any of the other page links, I simply receive a "No message" error. The error message is so vague that I'm not quite sure where to go from here. Perhaps I am using AJAX within Laravel in an overly complicated way? I was trying to stick to the conventions of the framework as much as possible, but I am open to trying it a different way if that would make this problem easier.

Answer 1

I am assuming that getSalesForcast is a scope so it should return a collection. I would recommend using forPage. I am not 100% sure how you are getting your start date and end parameter in the request, but given those values this should work. Also, I am assuming you are using timestamps.

const $page_limit = 25;

public function get_sales_forecast(Request $request) {

    //Get current page
    $current_page = LengthAwarePaginator::resolveCurrentPage();

    //Get data from Sales model
    $sales_forecast = Sales::where('created_at','>',$request->input('start_date'))
                      ->where('created_at','<',$request->input('end_date'))
                      ->forPage($current_page,self::$page_limit)
                      ->get();

    //Create paginator 
    $LengthAwarePaginator = new LengthAwarePaginator($sales_forecast, $sales_forecast->count(), self::$page_limit);

    //Set URL path for generated links
    $paginated_items->withPath($LengthAwarePaginator->url($current_page));

    //Render the view as an HTML string
    $html = view('sales-forecast-table')->with(['sales_forecast' => $LengthAwarePaginator->items()])->render();

    //Return the HTML 
    return response()->json(compact('html'));
}