JSFiddle - React, Tailwind, and code Playground

by Harisankaran Parameswaran

HTML

<form name="deleteFiles" action="" method="post" onsubmit="return confirm_update();">
    <input type='checkbox' name='files' id='1' value='1' />file 1
    <input type='checkbox' name='files' id='2' value='2' />file 2
    <br>
    <input type="submit" value="Submit" name="submit">
</form>

CSS

body {
    margin: 30px;
}

JavaScript

function confirm_update() {
    var chkCount = 0;
    var arrCheckboxes = document.deleteFiles.elements["files"];
    for (var i=0; i<arrCheckboxes.length; i++) {
        if(arrCheckboxes[i].checked == true) {
            chkCount++;
        }
    }
    if (chkCount === 0) {
        alert("You do not have any selected files to delete.");
        return false;
    } else {
        return confirm("Are you sure you want to proceed deleting the selected   files?");
    }
}