How to use PHP and JS to create a stock candle chart
The stock candle chart is a common technical analysis graphic in the stock market. It draws the opening price and closing price of the stock. Price, highest price, lowest price and other data can help investors understand the price fluctuations of stocks more intuitively. This article will teach you how to create stock candle charts using PHP and JS, with specific code examples.
1. Preparation
Before we start, we need to prepare the following environment:
1. A server running PHP
2. A browser that supports HTML5 and Canvas
3. Download and introduce the Chart.js library. You can download the latest version from the official website: https://www.chartjs.org/
2. Obtain stock data
First, we need to obtain the stock data Historical price data can be obtained from API interfaces, databases or other data sources. Here we assume that we have obtained an array containing stock prices. Each element contains the following data: date, opening price, closing price, highest price and lowest price.
3. Write PHP code to generate chart data
In the PHP file, we can use the obtained stock price array to convert it into a data format that meets the requirements of Chart.js. The specific implementation is as follows:
<?php
$stockData = array(
array("date" => "2021-01-01", "open" => 100, "close" => 120, "high" => 130, "low" => 90),
// 其他股票價格數(shù)據(jù)...
);
$chartData = array();
foreach ($stockData as $stock) {
$chartData[] = array(
"t" => strtotime($stock["date"]),
"o" => $stock["open"],
"c" => $stock["close"],
"h" => $stock["high"],
"l" => $stock["low"]
);
}
echo json_encode($chartData);
?>The above code first defines a $stockData array to store stock price data, and then converts each data item into a format that meets the requirements of Chart.js through a loop, and stores it in the $chartData array middle. Finally, use the json_encode function to convert the $chartData array into a JSON format string and output it to the browser.
4. Create an HTML file and introduce Chart.js
Next, we need to create an HTML file, introduce the Chart.js library, and write the Canvas tag for displaying candle charts. The specific code example is as follows:
<!DOCTYPE html>
<html>
<head>
<title>股票蠟燭圖</title>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
</head>
<body>
<canvas id="candlestick-chart"></canvas>
<script>
<?php include 'generateChartData.php'; ?> // 引入生成圖表數(shù)據(jù)的PHP文件
var ctx = document.getElementById('candlestick-chart').getContext('2d');
var chartData = <?php echo json_encode($chartData); ?>;
new Chart(ctx, {
type: 'candlestick',
data: {
datasets: [{
data: chartData
}]
},
options: {
// 具體的配置項可以根據(jù)需要進(jìn)行調(diào)整
}
});
</script>
</body>
</html>In the above code, we first introduced the Chart.js library, and then added a Canvas tag with the id of 'candlestick-chart' to the page to display the stock candle chart. . Next, the generated chart data is assigned to the chartData variable through PHP code. Finally, a candle chart instance is created using the Chart.js library, and the chart data is passed into the creation function.
5. Adjust the chart style and configuration items
According to actual needs, we can further adjust the chart style and configuration items according to the Chart.js document. The document address is as follows: https://www.chartjs.org/docs/latest/charts/candlestick.html
By appropriately configuring the chart style and configuration items, the stock candlestick chart can be made more in line with our needs. , and better display the changes in stock prices.
Summary
Creating stock candle charts using PHP and JS requires a server running PHP and a browser that supports HTML5 and Canvas. By converting the stock data into a data format that meets the requirements of Chart.js, and then using Chart.js to create a candle chart instance, the stock price fluctuations can be displayed in the browser. By adjusting the style and configuration items, the stock candle chart can be made more in line with our needs. Hope this article helps you!
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