如何将最新的时间戳添加到 Google 仪表
How to add latest TimesStamp to Google Gauge
我需要帮助将最新的 TimesStamp 添加到显示 Google 仪表的页面。我已经在不需要刷新页面的情况下进行了仪表工作和自动刷新,但现在我需要在它上面显示,或者当数据库中的最新条目被创建时在它旁边显示(显示当前显示在仪表中的值的时间戳)。到目前为止,这是我的代码:
Chart.html
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<script>
google.charts.load('current', {
packages: ['gauge']
}).then(function () {
var options = {
width: 800, height: 240,
greenFrom: 98, greenTo: 100,
yellowFrom:90, yellowTo: 98,
minorTicks: 5
};
var chart = new google.visualization.Gauge(document.getElementById('chart_div'));
drawChart();
function drawChart() {
$.ajax({
url: 'getdata.php',
dataType: 'json'
}).done(function (jsonData) {
// use response from php for data table
var data = google.visualization.arrayToDataTable(jsonData);
chart.draw(data, options);
// draw again in 5 seconds
window.setTimeout(drawChart, 5000);
});
}
});
</script>
</head>
<body>
<div id="chart_div" style="width: 800px; height: 240px;"></div>
</body>
</html>
这里是getdata.php
<?php
$servername = "localhost";
$username = "u644759843_miki";
$password = "plantaze2020!";
$dbname = "u644759843_plantazeDB";
// Create connection
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = mysqli_connect($servername, $username, $password, $dbname);
$conn->set_charset('utf8mb4');
$sql = "SELECT ProductPurity FROM `Precizno ProductPurity` ORDER BY TimesStamp DESC LIMIT 1";
$result = mysqli_query($conn, $sql);
// create data array
$data = [];
$data[] = ["Label", "Value"];
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
$data[] = ["ProductPurity", (float) $row["ProductPurity"]];
}
mysqli_close($conn);
// write data array to page
echo json_encode($data);
?>
我们需要在 return 来自 php 的数据中包含时间戳。
首先,将字段添加到 select 语句中,此处...
$sql = "SELECT ProductPurity, TimesStamp FROM `Precizno ProductPurity` ORDER BY TimesStamp DESC LIMIT 1";
接下来,我们使用一个变量来保存时间戳...
// create data array
$data = [];
$data[] = ["Label", "Value"];
$stamp = null;
然后,在 while 循环中,我们保存时间戳的值...
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
$data[] = ["ProductPurity", (float) $row["ProductPurity"]];
$stamp = $row["TimesStamp"]
}
最后,我们将图表数据和时间戳合并到一个对象中发送到页面。
$data = array('rows' => $data, 'timestamp' => $stamp);
以下是更新后的 php 片段...
<?php
$servername = "localhost";
$username = "u644759843_miki";
$password = "plantaze2020!";
$dbname = "u644759843_plantazeDB";
// Create connection
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = mysqli_connect($servername, $username, $password, $dbname);
$conn->set_charset('utf8mb4');
$sql = "SELECT ProductPurity, TimesStamp FROM `Precizno ProductPurity` ORDER BY TimesStamp DESC LIMIT 1";
$result = mysqli_query($conn, $sql);
// create data array
$data = [];
$data[] = ["Label", "Value"];
$stamp = null;
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
$data[] = ["ProductPurity", (float) $row["ProductPurity"]];
$stamp = $row["TimesStamp"]
}
mysqli_close($conn);
// write data array to page
$data = array('rows' => $data, 'timestamp' => $stamp);
echo json_encode($data);
?>
然后在 html 页面上,我们需要调整接收数据的方式...
要接收图表数据,我们需要使用'rows'
属性从数据中获取。
// use response from php for data table
var data = google.visualization.arrayToDataTable(jsonData.rows); // <-- add .rows
我们可以收到时间戳如下...
jsonData.timestamp
不确定要如何显示时间戳,这里使用 <div>
。
所以要更新新的 <div>
元素...
document.getElementById('timestamp').innerHTML = jsonData.timestamp;
根据更新后的 html 片段...
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<script>
google.charts.load('current', {
packages: ['gauge']
}).then(function () {
var options = {
width: 400, height: 120,
redFrom: 90, redTo: 100,
yellowFrom:75, yellowTo: 90,
minorTicks: 5
};
var chart = new google.visualization.Gauge(document.getElementById('chart_div'));
drawChart();
function drawChart() {
$.ajax({
url: 'getdata.php',
dataType: 'json'
}).done(function (jsonData) {
// use response from php for data table
var data = google.visualization.arrayToDataTable(jsonData.rows);
chart.draw(data, options);
// update timestamp
document.getElementById('timestamp').innerHTML = jsonData.timestamp;
// draw again in 5 seconds
window.setTimeout(drawChart, 5000);
});
}
});
</script>
</head>
<body>
<div id="timestamp"></div>
<div id="chart_div" style="width: 400px; height: 120px;"></div>
</body>
</html>
我需要帮助将最新的 TimesStamp 添加到显示 Google 仪表的页面。我已经在不需要刷新页面的情况下进行了仪表工作和自动刷新,但现在我需要在它上面显示,或者当数据库中的最新条目被创建时在它旁边显示(显示当前显示在仪表中的值的时间戳)。到目前为止,这是我的代码:
Chart.html
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<script>
google.charts.load('current', {
packages: ['gauge']
}).then(function () {
var options = {
width: 800, height: 240,
greenFrom: 98, greenTo: 100,
yellowFrom:90, yellowTo: 98,
minorTicks: 5
};
var chart = new google.visualization.Gauge(document.getElementById('chart_div'));
drawChart();
function drawChart() {
$.ajax({
url: 'getdata.php',
dataType: 'json'
}).done(function (jsonData) {
// use response from php for data table
var data = google.visualization.arrayToDataTable(jsonData);
chart.draw(data, options);
// draw again in 5 seconds
window.setTimeout(drawChart, 5000);
});
}
});
</script>
</head>
<body>
<div id="chart_div" style="width: 800px; height: 240px;"></div>
</body>
</html>
这里是getdata.php
<?php
$servername = "localhost";
$username = "u644759843_miki";
$password = "plantaze2020!";
$dbname = "u644759843_plantazeDB";
// Create connection
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = mysqli_connect($servername, $username, $password, $dbname);
$conn->set_charset('utf8mb4');
$sql = "SELECT ProductPurity FROM `Precizno ProductPurity` ORDER BY TimesStamp DESC LIMIT 1";
$result = mysqli_query($conn, $sql);
// create data array
$data = [];
$data[] = ["Label", "Value"];
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
$data[] = ["ProductPurity", (float) $row["ProductPurity"]];
}
mysqli_close($conn);
// write data array to page
echo json_encode($data);
?>
我们需要在 return 来自 php 的数据中包含时间戳。
首先,将字段添加到 select 语句中,此处...
$sql = "SELECT ProductPurity, TimesStamp FROM `Precizno ProductPurity` ORDER BY TimesStamp DESC LIMIT 1";
接下来,我们使用一个变量来保存时间戳...
// create data array
$data = [];
$data[] = ["Label", "Value"];
$stamp = null;
然后,在 while 循环中,我们保存时间戳的值...
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
$data[] = ["ProductPurity", (float) $row["ProductPurity"]];
$stamp = $row["TimesStamp"]
}
最后,我们将图表数据和时间戳合并到一个对象中发送到页面。
$data = array('rows' => $data, 'timestamp' => $stamp);
以下是更新后的 php 片段...
<?php
$servername = "localhost";
$username = "u644759843_miki";
$password = "plantaze2020!";
$dbname = "u644759843_plantazeDB";
// Create connection
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = mysqli_connect($servername, $username, $password, $dbname);
$conn->set_charset('utf8mb4');
$sql = "SELECT ProductPurity, TimesStamp FROM `Precizno ProductPurity` ORDER BY TimesStamp DESC LIMIT 1";
$result = mysqli_query($conn, $sql);
// create data array
$data = [];
$data[] = ["Label", "Value"];
$stamp = null;
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
$data[] = ["ProductPurity", (float) $row["ProductPurity"]];
$stamp = $row["TimesStamp"]
}
mysqli_close($conn);
// write data array to page
$data = array('rows' => $data, 'timestamp' => $stamp);
echo json_encode($data);
?>
然后在 html 页面上,我们需要调整接收数据的方式...
要接收图表数据,我们需要使用'rows'
属性从数据中获取。
// use response from php for data table
var data = google.visualization.arrayToDataTable(jsonData.rows); // <-- add .rows
我们可以收到时间戳如下...
jsonData.timestamp
不确定要如何显示时间戳,这里使用 <div>
。
所以要更新新的 <div>
元素...
document.getElementById('timestamp').innerHTML = jsonData.timestamp;
根据更新后的 html 片段...
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<script>
google.charts.load('current', {
packages: ['gauge']
}).then(function () {
var options = {
width: 400, height: 120,
redFrom: 90, redTo: 100,
yellowFrom:75, yellowTo: 90,
minorTicks: 5
};
var chart = new google.visualization.Gauge(document.getElementById('chart_div'));
drawChart();
function drawChart() {
$.ajax({
url: 'getdata.php',
dataType: 'json'
}).done(function (jsonData) {
// use response from php for data table
var data = google.visualization.arrayToDataTable(jsonData.rows);
chart.draw(data, options);
// update timestamp
document.getElementById('timestamp').innerHTML = jsonData.timestamp;
// draw again in 5 seconds
window.setTimeout(drawChart, 5000);
});
}
});
</script>
</head>
<body>
<div id="timestamp"></div>
<div id="chart_div" style="width: 400px; height: 120px;"></div>
</body>
</html>