从PHP转换为JSON文件以绘制具有JS图表的图表

Question

i want to extract data from the database and send as JSON file to the front-end and then try to draw graph. i have three tables notification where the website url is saved, status that has status and speed( google page speed) and a pivot table where all data related to a website is stored as values. i have model, and inside the model, i have a function that makes many to many relations between notifications and status table. i have a controller called chart controller

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class ChartController extends Controller
{

     public static function speedHistory(){

        $o_status = Status::where('name','speed')->first();
        $o_response = $this->statuses()->where('status_id', $o_status->id)
        ->select('values AS value', 'created_at AS timestamp')->orderBy('created_at','DESC')->get();


        if($o_response){
            return response()->json($o_response);
        }
            // return an empty json array instead of false
            //return false;
        return response()->json(array());
    }
}

and a front end page called app.js

document.addEventListener('DOMContentLoaded', function(){

    $.getJSON("/json", function (result) {

        alert(result)
    }

and a route

Route::get('json','ChartController@speedHistory');

i use alert to see,if the data is going to app.js but it doesnt work. i would apperciate nay kind of help and suggestions?

this is the view file

extends('layout')

@section('header')
    <a class="logout" href="<?php echo 'login'?>">Logout</a>
    <a href="{{ URL::to('/') }}">               
       <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/65/Crystal_button_cancel.svg/32px-Crystal_button_cancel.svg.png" alt="Submit" width="48" height="48">
    </a>
@stop

@section('content')
<script src="app.js"></script>
    <table class="table">
            <thead> 
            <h3>{{ $notification->website_url }}</h3>
                <tr> 
                    <th>date</th> 
                    <th>status</th>
                </tr> 
            </thead> 
            <tbody>
                <?php $notificationHealth = $notification->history('health'); ?>


                @foreach($notificationHealth as $status)

                    <tr>   
                        <td>{{ $status['timestamp'] }}</td>                         
                        <td> {{ $status['value'] }}</td>.
                    </tr>
                @endforeach
            </tbody>
        </table>

        <canvas id="pageSpeedHistoryChart" width="200" height="50"></canvas>
@stop

@section('footer')

@stop

Answer 1

Can you add more details?

With /json you are calling a page under the same domain. Is this right? You can use developer tools of chrome. Under network tab you can see the response of the call that you have done.