在 CodeIgniter 3 中多次渲染视图
Posted
技术标签:
【中文标题】在 CodeIgniter 3 中多次渲染视图【英文标题】：View is being rendered multiple times in CodeIgniter 3 【发布时间】：2022-01-22 19:47:53 【问题描述】：我正在使用 CodeIgniter 3 并在我的 index() 函数中将一些数据传递给我的视图并执行一些其他函数。但在我看来，相同的元素被渲染了 3 次。我认为那是因为我也在其他 2 个函数中加载了相同的视图。我需要一次渲染元素。我怎样才能做到这一点？太棒了！
视图的屏幕截图。缩小以捕获完整视图：
控制器代码：
<?php
class Insight extends CI_Controller
public function index()
$this->load->Model('Insight_Model');
$data['donorcount'] = $this->Insight_Model->donorCount();
$this->load->Model('Insight_Model');
$data['packetcount'] = $this->Insight_Model->packetCount();
$this->load->view('insight', $data);
$this->bloodTypesChart();
$this->genderCountsChart();
public function bloodTypesChart()
$query=" SELECT BloodType as blood_type, COUNT(PacketID) as packetcount FROM packets WHERE isAvailable = 1 GROUP BY blood_type";
$packetChartData = [];
$blood_types = $this->db->query($query)->result_array();
foreach($blood_types as $row)
$packetChartData['packetLabel'][] = $row['blood_type'];
$packetChartData['packetData'][] = $row['packetcount'];
$packetChartData['chart_data'] = json_encode($packetChartData);
$this->load->view('insight',$packetChartData);
public function genderCountsChart()
$query=" SELECT DonorGender as donor_gender, COUNT(DonorID) as donor_count FROM donors GROUP BY donor_gender";
$genderChartData = [];
$genderCount = $this->db->query($query)->result_array();
foreach($genderCount as $row)
$genderChartData['genderLabel'][] = $row['donor_gender'];
$genderChartData['genderData'][] = $row['donor_count'];
$genderChartData['chart_data'] = json_encode($genderChartData);
$this->load->view('insight',$genderChartData);
查看代码：
<!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/bootstrap@5.1.3/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 $packetcount; ?></h1></div>
</div>
</div>
</div>
</div>
</div>
<div class="chart-container container mb-4">
<div class="bar-chart-container">
<canvas id="packet-count-chart" style="background: #ecf5ec"></canvas>
</div>
</div>
<div class="chart-container container">
<div class="doughnut-chart-container">
<canvas id="gender-count-chart" style="background: #ecf5ec"></canvas>
</div>
</div>
<?php include_once 'footer/footer.php' ?>
</body>
<script>
const ctx1 = document.getElementById('packet-count-chart');
const chart1 = new Chart(ctx1,
type: 'bar',
data:
labels: <?php echo json_encode($packetLabel)?>,
datasets: [
label: '# of packets available',
data: <?php echo json_encode($packetData)?>,
backgroundColor: [
'rgba(255, 99, 132)',
'rgba(54, 162, 235)',
'rgba(255, 206, 86)',
'rgba(75, 192, 192)',
'rgba(153, 102, 255)',
'rgba(255, 159, 64)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
]
,
options:
responsive:true,
scales:
y:
beginAtZero: true
);
const ctx2 = document.getElementById('gender-count-chart');
const chart2 = new Chart(ctx2,
type: 'doughnut',
data:
labels: <?php echo json_encode($genderLabel)?>,
datasets: [
label: '# of donors',
data: <?php echo json_encode($genderData)?>,
backgroundColor: [
'rgba(255, 99, 132)',
'rgba(54, 162, 235)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)'
],
borderWidth: 1
]
,
options:
scales:
y:
beginAtZero: true
);
</script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chart.js@3.6.2/dist/chart.min.js"></script>
<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
</html>
【问题讨论】：
现在您正在加载 3 * 洞察视图，每个控制器功能一个，为什么？你真正需要什么数据？我想不是完整的视图文件？ 我需要防止多次加载视图并将index() 函数中的donorcount 和packetcount 数据传递给视图。我还需要将bloodTypesChart() 函数中的packetLabel、packetData 数据和genderCountsChart() 函数中的genderLabel 和genderData 数据传递给洞察视图。
你已经有一个答案，它告诉你如何只将数据发送到视图
当我在 JS 外部回显它时，它可以正确输出，但在 JS 代码中不起作用。
在你的视图顶部做一个echo '<pre>';print_r($data); die;，看看数组结构是怎样的，并相应地处理你的js部分
【参考方案1】：
收集所有数据，打包成$data，传递给view。 顺便说一句，
labels: <?php echo json_encode($packetLabel)?>,
，太可怕了。使用 Ajax 获取此数据
控制器
<?php
class Insight extends CI_Controller
public function index()
$this->load->Model('Insight_Model');
$data['donorcount'] = $this->Insight_Model->donorCount();
$data['packetcount'] = $this->Insight_Model->packetCount();
$data['packetChartData'] = $this->bloodTypesChart();
$data['genderChartData'] = $this->genderCountsChart();
$this->load->view('insight', $data);
public function bloodTypesChart()
$query=" SELECT BloodType as blood_type, COUNT(PacketID) as packetcount FROM packets WHERE isAvailable = 1 GROUP BY blood_type";
$packetChartData = [];
$blood_types = $this->db->query($query)->result_array();
foreach($blood_types as $row)
$packetChartData['packetLabel'][] = $row['blood_type'];
$packetChartData['packetData'][] = $row['packetcount'];
return $packetChartData;
public function genderCountsChart()
$query=" SELECT DonorGender as donor_gender, COUNT(DonorID) as donor_count FROM donors GROUP BY donor_gender";
$genderChartData = [];
$genderCount = $this->db->query($query)->result_array();
foreach($genderCount as $row)
$genderChartData['genderLabel'][] = $row['donor_gender'];
$genderChartData['genderData'][] = $row['donor_count'];
return $genderChartData;
查看
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet">
<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css"/>
<link rel="stylesheet" type="text/css" href="<?php echo base_url('assests/styles/table.css'); ?>">
<title>Kegalle Blood Bank - Blood Types Insight</title>
</head>
<body style="margin-bottom: 50px">
<?php include_once 'navbars/navbar2.php' ?>
<?php
if (!($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 $packetcount; ?></h1></div>
</div>
</div>
</div>
</div>
</div>
<div class="chart-container container mb-4">
<div class="bar-chart-container">
<canvas id="packet-count-chart" style="background: #ecf5ec"></canvas>
</div>
</div>
<div class="chart-container container">
<div class="doughnut-chart-container">
<canvas id="gender-count-chart" style="background: #ecf5ec"></canvas>
</div>
</div>
<?php include_once 'footer/footer.php' ?>
</body>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chart.js@3.6.2/dist/chart.min.js"></script>
<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<script>
const ctx1 = document.getElementById('packet-count-chart');
const chart1 = new Chart(ctx1,
type: 'bar',
data:
labels: <?php echo isset($genderChartData['genderLabel'])?json_encode($packetChartData['packetLabel']):'[]';?>,
datasets: [
label: '# of packets available',
data: <?php echo isset($genderChartData['genderLabel'])?json_encode($packetChartData['packetData']):'[]';?>,
backgroundColor: [
'rgba(255, 99, 132)',
'rgba(54, 162, 235)',
'rgba(255, 206, 86)',
'rgba(75, 192, 192)',
'rgba(153, 102, 255)',
'rgba(255, 159, 64)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
]
,
options:
responsive:true,
scales:
y:
beginAtZero: true
);
const ctx2 = document.getElementById('gender-count-chart');
const chart2 = new Chart(ctx2,
type: 'doughnut',
data:
labels: <?php echo isset($genderChartData['genderLabel'])?json_encode($genderChartData['genderLabel']):'[]';?>,
datasets: [
label: '# of donors',
data: <?php echo isset($genderChartData['genderLabel'])?json_encode($genderChartData['genderData']):'[]'; ?>,
backgroundColor: [
'rgba(255, 99, 132)',
'rgba(54, 162, 235)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)'
],
borderWidth: 1
]
,
options:
scales:
y:
beginAtZero: true
);
</script>
</html>
检查一下
【讨论】：
感谢@WiatroBosy！以上代码不能与<?php echo json_encode($packetLabel)?> 一起使用吗？为什么这是获取数据的糟糕方法？最后，您能否告诉我如何使用 Ajax 获取这些数据？
上面的代码应该可以工作 - 在你的地方检查一下。 Ajax - 阅读一些教程w3schools.com/jquery/ajax_ajax.asp
当您尝试使用<?php echo json_encode($packetLabel)?> 获取数据时，它不会输出任何内容。但是当你echo $packetChartData 时，它会输出关联数组。
更正视图中变量的名称。
我更正了代码。立即查看以上是关于在 CodeIgniter 3 中多次渲染视图的主要内容，如果未能解决你的问题，请参考以下文章
使用 cpanel 的 codeigniter 密码保护目录