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How do I prevent my page from refreshing on submit

Here is the JavaScript:

myform.addEventListener('submit', (event) => {
fetch("url", {mode: "no-cors"})
.then(res=> {
    if(res.ok){
        console.log("cats")
    }
    else{
        event.preventDefault()
        document.getElementById("subcim_error_message").innerHTML="You must add a title!"
        return false
    }
})})

Here is the html:

   <head>
    <title>pH Login</title>
    <link rel="stylesheet" href="../styles/ph-styles.css"/>
</head>
<body>
    <header>
        <h1>parry Hotter School for Alchemy and Pyromancy</h1>
    </header>
    <div id="hat" style="display: flex; justify-content: center;">
        <img src="https://www.renderhub.com/realityscanning/old-boot-with-plants-inside/old-boot-with-plants-inside-01.jpg" style="height: 15rem" alt="Sorting Boot"/>
    </div>
    <span class="error_form" id="subcim_error_message"></span>
    <form name="myform">
        <section class="two_columns">
            <label for="username">Username:</label>
            <input id="username" placeholder="parry Hotter" type="text"/>
            <label for="password">Password:</label>
            <input id="password" placeholder="*******" type="password" maxlength="20"/>
        </section>
        <input type="submit"/>
    </form>
    <footer>
        <h6>&copy;Copyright pHSfAaP. All rights reserved.</h6>
    </footer>
    <style>
        #hat{
            margin: 3em;
        }

        img{
            border: 1em;
            border-style: solid;
            border-color: steelblue;
        }
    </style>
    <script src="../scripts/parry-hotter-login.js"></script>
</body>

I am trying to display an error message when someone enters invalid credentials but everytime it happens the page refreshes so the error message immediately vanishes

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