How to use JavaScript for a custom stock market analysis tool?
13/03/2024
•
5
min
Creating a custom stock market analysis tool involves several steps. It includes fetching data from a stock market data provider, interpreting that data, and presenting it in a user-friendly format. Here's how you can build a simple stock market analysis tool using HTML, CSS, JavaScript, and a third-party API (like Alpha Vantage or Finnhub).
This example will focus on Alpha Vantage API and chart.js library to represent data. Remember that for a production application you would need proper validation, error handling, and other key considerations. You need to sign up on Alpha Vantage to get your API key.
Let's create a simple application that allows the user to enter a stock symbol, fetches historical data of that stock, and plots the stock price data on a graph.
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Step 1: Set up HTML and CSS:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Stock Market Analysis Tool</title>
<style>
body {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
padding: 2rem;
}
#chart {
width: 80%;
height: auto;
}
</style>
</head>
<body>
<input id="stockInput" type="text" placeholder="Enter stock symbol">
<button onclick="fetchData()">Fetch Data</button>
<canvas id="chart"></canvas>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<script src="main.js"></script>
</body>
</html>
Step 2: Set up JavaScript:
Create a new file titled main.js and write your JavaScript code in it.
let fetchData = async () => {
let stockSymbol = document.querySelector('#stockInput').value;
let apikey = 'YOUR_API_KEY';
let api = `https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=${stockSymbol}&apikey=${apikey}`;
let res = await fetch(api);
let data = await res.json();
displayData(data);
};
let displayData = (data) => {
let stockDataset = [];
let labels = [];
for (let date in data['Time Series (Daily)']) {
stockDataset.unshift(parseFloat(data['Time Series (Daily)'][date]['4. close']));
labels.unshift(date);
}
let ctx = document.querySelector('#chart').getContext('2d');
const chart = new Chart(ctx, {
type: 'line',
data: {
labels: labels,
datasets: [{
label: 'Stock Price',
data: stockDataset,
borderColor: 'rgb(75, 192, 192)',
tension: 0.1
}]
}
});
};
This JavaScript code fetches data from the Alpha Vantage API when a button is clicked, parses and formats the data, and displays it on a graph using the Chart.js library. Replace 'YOUR_API_KEY' with your own Alpha Vantage key.
Make sure to test your application with a few stock symbols (for instance, "GOOG", "AAPL", "AMZN", etc.).
For a more sophisticated tool, consider adding features like the ability to choose different types of charts (e.g., line, bar, candlestick), time periods, or overlaying data for multiple stocks. Moreover, consider learning more about pagination and how to handle it with Alpha Vantage API if you're retrieving significant amounts of data.
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