why JSON return html

Question

I'm using Laravel 5.1. I try to get some data in JSON format through the controller, but it return html instead of json.

create.blade.php

{!! Form::open(['url' => 'schedule']) !!}



@include('schedule.form',['submitButtonText'=>'Submit'])

{!! Form::close() !!}

edit.blade.php

   {!! Form::model($schedule,['method'=>'PATCH','url' => 'schedule/'. $schedule->scheduleID ]) !!}

    @include('schedule.form',['submitButtonText'=>'Update'])



    {!! Form::close() !!}

Ajax in schedule.form

 $.post('../schedule/loadRoute',{routeID:routeID},function(r){

        console.log(r);

        $.each(JSON.parse(r), function(key, value){ 



               coordinates.push(new google.maps.LatLng(value.lat,value.lon));

               if(value.is_station==1){

                   addMarker(new google.maps.LatLng(value.lat,value.lon),value.name);

               }



        });



        clearMap();



    });

loadRoute function in controller

public function loadRoute(Request $request){



   $routeID=$request->get('routeID');







    $station=Station::where('route_id',$routeID)->get()->toArray();





    echo json_encode($station);



}

Edit

routes.php

 Route::group(

    ['middleware' => ['web']],

    function () {

        Route::auth();



        Route::get('schedule/getScheduleByRouteID/{routeID}', 'ScheduleController@getScheduleByRouteID');



        Route::resource('schedule', 'ScheduleController', ['except' => ['destroy', 'show']]);



            Route::post('schedule/loadRoute','ScheduleController@loadRoute');

});

Both create and edit page share the same schedule.form, but the JSON data is returned successfully in create page only, for edit page it return html instead of JSON, and I get this error in console (Uncaught SyntaxError: Unexpected token < in JSON at position 0)

Both page using the same form, but why it doesn't work when comes to edit page?

Answer 1

I would imagine one of the reasons you're seeing this is because you're loadRoute route in underneath the resource route.

Try changing the order to:

Route::get('schedule/getScheduleByRouteID/{routeID}', 'ScheduleController@getScheduleByRouteID');

Route::post('schedule/loadRoute','ScheduleController@loadRoute');

Route::resource('schedule', 'ScheduleController', ['except' => ['destroy', 'show']]);

https://laravel.com/docs/5.2/controllers#restful-supplementing-resource-controllers

Also, you should return from a controller not echo:

public function loadRoute(Request $request)
{
    return Station::where('route_id', $request->get('routeID'))->get();
}

In the above Laravel will automatically json_encode() the response and add the appropriate headers.

With your $.post call I would change it to the following:

$.post('{{ url('schedule/loadRoute') }}', {routeID: routeID, _token: '{{ csrf_token() }}'}, function (r) {
    console.log(r);

    $.each(r, function (key, value) {

        coordinates.push(new google.maps.LatLng(value.lat, value.lon));
        if (value.is_station == 1) {
            addMarker(new google.maps.LatLng(value.lat, value.lon), value.name);
        }

    });

    clearMap();

}, 'json');

This is because Laravel will now be returning a proper json response with the correct headers so you shouldn't need to JSON.parse() it. Also, you don't appear to be providing the csrf_token so that has been added to the data object as well.

Hope this helps!