Accessing data in an associative array in CodeIgniter 3

Question

I'm using CodeIgniter 3 and I'm passing an associative array from the controller to the view. In the view I'm trying to render a chart using ChartJS so I need to get the data of 0th and 1st indexes separately. {"label":["A+","AB-","B+","B-","O+"],"data":["6","2","5","2","3"]} is the associative array I'm passing. Below is the code in the controller.

public function bloodTypesChart()
    {
        $totalPackets = $this->db->count_all_results();

        $chartData = [];
        $blood_types = $this->db->query("SELECT (BloodType) as blood_type FROM packets WHERE (isAvailable) = '1' GROUP BY blood_type")->result_array();

        $record = $this->db->from('packets')
            ->select('count(PacketID) count, BloodType blood_type')
            ->group_by('blood_type')
            ->get()
            ->result_array();

        foreach ($record as $row) {
            $chartData['label'][] = $row['blood_type'];
            $chartData['data'][] = $row['count'];
        }
        $chartData['chart_data'] = json_encode($chartData);
        $this->load->view('insight', $chartData);
    }

I need to pass data in the label and data indexes separately to the ChartJS function. How can I do that in the view?

View

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
    <link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css"/>
    <link rel="stylesheet" type="text/css" href="<?php echo base_url('assests/styles/table.css'); ?>">
    <title>Kegalle Blood Bank - Blood Types Insight</title>
</head>
<body style="margin-bottom: 50px">
<?php include_once 'navbars/navbar2.php' ?>

<?php
if (!($this->session->userdata('isStaffLoggedIn'))) {
    redirect('home/login');
}
?>


<div class="container">
    <div class="row">
        <div class="col-md-12 text-center mt-5">
            <h1>Insight</h1>
        </div>
        <div class="row text-center m-5">
            <div class="col-md-6">
                <div class="card border-info mx-sm-1 p-3 shadow-lg">
                    <div class="card border-danger shadow text-danger p-3 my-card"><span class="fa fa-heart"
                                                                                         aria-hidden="true"></span>
                    </div>
                    <div class="text-danger text-center mt-3"><h4>Total Donors</h4></div>
                    <div class="text-danger text-center mt-2"><h1><?php echo $donorcount; ?></h1></div>

                </div>
            </div>
            <div class="col-md-6">
                <div class="card border-success mx-sm-1 p-3 shadow-lg">
                    <div class="card border-success shadow text-success p-3 my-card"><span class="fa fa-eye"
                                                                                           aria-hidden="true"></span>
                    </div>
                    <div class="text-success text-center mt-3"><h4>Total Available Packets</h4></div>
                    <div class="text-success text-center mt-2"><h1><?php echo $packetcount; ?></h1></div>
                </div>
            </div>
        </div>
    </div>
</div>

<div class="chart-container container">
    <div class="bar-chart-container">
        <canvas id="bar-chart" style="background: #fff"></canvas>
    </div>
</div>

<?php include_once 'footer/footer.php' ?>
</body>

<script>
    new Chart(document.getElementById("bar-chart"), {
        type: 'bar',
        data: {
            labels: <?php echo $label?>,
            datasets: [
                {
                    label: "Population (millions)",
                    backgroundColor: ["#3e95cd", "#8e5ea2","#3cba9f","#e8c3b9","#c45850"],
                    data: <?php echo $data?>
                }
            ]
        },
        options: {
            legend: { display: false },
            title: {
                display: true,
                text: 'Predicted world population (millions) in 2050'
            }
        }
    });
</script>

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/chart.min.js"></script>
<script src="https://code.jquery.com/jquery-3.5.1.js"></script>

</html>

It looks like you're passing three variables to the view: $label, $data and $chart_data (I don't really see the point of that variable though). Have you tried using those variables in your view? Where exactly are you stuck? What have you tried in the view? — M. Eriksson
– M. Eriksson, Commented Dec 20, 2021 at 7:58
@M. Eriksson yes when I just print_r($label) it outputs Array ( [0] => A+ [1] => AB- [2] => B+ [3] => B- [4] => O+ ). but it doesn't work in JavaScript code. — Pasindu Ruwandeniya
– Pasindu Ruwandeniya, Commented Dec 20, 2021 at 8:24

Vitalij Mik · Accepted Answer · 2021-12-20 08:45:44Z

2

Since you want your variables appear in Javascript you need to json_encode them. your $label and $data is still in PHP you can just echo it out into a json.

in your view you can do following

   data: {
        labels: <?= json_encode($label)?>,
        datasets: [
            {
                label: "Population (millions)",
                backgroundColor: ["#3e95cd", "#8e5ea2","#3cba9f","#e8c3b9","#c45850"],
                data: <?= json_encode($data)?>
            }
        ]
    },

answered Dec 20, 2021 at 8:45

Vitalij Mik

5723 silver badges7 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Accessing data in an associative array in CodeIgniter 3

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related