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How to make addEventListener stream continuously on button submit

I am trying to stream a list of json objects from my servers endpoint to my frontend using javascript and html. Below is my code. Currently addEventListener works fine when I click my form button (HTML also added below for reference). Heres my problem:

The list of objects my server endpoint returns is a single list which is continuously having objects appended to the list. So I want my front end to refresh automatically every second to show the latest version. And so I am finding a way for my addEventListener to rerun the function each time after clearing the HTML it is pushing. Currently, I have to click on my button to achieve that and the previously pushed HTML is not getting cleared either. So each time I click on the button, I am getting all the existing HTML displayed as many times as I have clicked the button (old versions) plus the latest version of my endpoint data.

The solution I want to achieve is to be able to click on my start stream button once, and have the function run every X seconds after clearing the older data each time to only show the latest list returned by fetch.

const startStream = document.querySelector('form')
const messageOne = document.querySelector('#message-1')

startStream.addEventListener('submit', (e) => {
    e.preventDefault()

    messageOne.textContent = 'Streaming...'

    function fetchData() {
        fetch('http://localhost:1337/dashboard')
        .then(response => {
            if (!response.ok) {
                throw Error('ERROR')
            }
            response.json().then(events => {
            events.forEach(event => {
                const html = `<div class="event">
                    Event: ${event.name}
                </div>
                `
                let div = document.createElement('div');
                div.setAttribute("id", "app");
                div.innerHTML = html;
                document.body.appendChild(div);

          })
    })
        .catch(error => {
            console.log(error)
        })
    })
}
   fetchData()
})

Here is the HTML:

<!DOCTYPE html>

<html>
    
<head>
    <link rel="stylesheet" href="./css/styles.css">
</head>

<body>
    <h1>Dashboard</h1>
    
    <form>
        <button>Start Stream</button>
    </form>

    <p id="message-1"></p>
    
    <script src='./js/app.js'></script> 
</body>

</html>
Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW

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