I'm currently building a roulette system program (this is more to stop me from placing bets than placing bets!) and I'm just doing the basic framework, but have been stuck with the main window "#results" not scrolling Questions are full of consequences. The scrolling needs to follow the latest row of content, so the latest content returned from input in the modal box is always shown at the bottom. I spent hours researching many possible solutions to no avail.
Here is the code: (I apologize for the length of the full script)
<!DOCTYPE html>
<html>
<body>
<div id="results">
</div>
<div id="modal">
<div id="modal-content">
<p>Select a number between 0 and 36:</p>
<div id="numberButtons"></div>
<button id="close-button" onclick="closeModal()">Close</button>
</div>
</div>
</div>
<style>
/* The modal background */
#modal {
position: fixed;
z-index: 1;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: rgba(0, 0, 0, 0.5);
}
/* The modal content */
#modal-content {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
background-color: #fefefe;
padding: 20px;
width: 18%;
border: 3px solid black;
}
/* The close button */
#close-button {
display: block;
margin: 0 auto;
}
#numberButtons button {
color: white;
width: 50px;
height: 50px;
font-size:30px;
font-weight:600;
}
#modal.inactive{
opacity: 0.2;
}
</style>
<script>
var bankRoll = parseFloat(prompt("Please enter your starting bankroll:"));
if(isNaN(bankRoll)){
bankRoll = parseFloat(prompt("Invalid input. Please enter a valid number for your starting bankroll:"));
}
bankRoll = bankRoll.toFixed(2);
var spinNumber=0;
var backline="";
var isDragging = false;
var currentX;
var currentY;
var initialX;
var initialY;
var xOffset = 0;
var yOffset = 0;
const modalContent = document.querySelector("#modal-content");
modalContent.addEventListener("mousedown", dragStart);
modalContent.addEventListener("mouseup", dragEnd);
modalContent.addEventListener("mousemove", drag);
function dragStart(e) {
initialX = e.clientX - xOffset;
initialY = e.clientY - yOffset;
if (e.target === modalContent) {
isDragging = true;
}
}
let inactivityTimeout;
function dragEnd(e) {
initialX = currentX;
initialY = currentY;
isDragging = false;
clearTimeout(inactivityTimeout);
inactivityTimeout = setTimeout(() => {
modal.classList.add("inactive")
}, 15000)
}
function drag(e) {
if (e.buttons === 1) {
e.preventDefault();
currentX = e.clientX - initialX;
currentY = e.clientY - initialY;
xOffset = currentX;
yOffset = currentY;
setTranslate(currentX, currentY, modalContent);
clearTimeout(inactivityTimeout);
modal.classList.remove("inactive")
}
}
function setTranslate(xPos, yPos, el) {
el.style.transform = "translate3d(" + xPos + "px, " + yPos + "px, 0)";
}
function getNumberType(number) {
if (number === 0) {
return "green";
} else if (number % 2 === 0) {
return "even";
} else {
return "odd";
}
}
function roulette(number) {
// Determine the color of the number
var color;
if (number === 0) {
color = "Green";
} else if (number === 1 || number === 3 || number === 5 || number === 7 || number === 9 || number === 12 || number === 14 || number === 16 || number === 18 || number === 19 || number === 21 || number === 23 || number === 25 || number === 27 || number === 30 || number === 32 || number === 34 || number === 36) {
color = "Red";
} else {
color = "Black";
}
// Map the color names to CSS color values
if (color === "Green") {
return "rgb(0, 128, 0)";
} else if (color === "Red") {
return "rgb(255, 0, 0)";
} else {
return "rgb(0, 0, 0)";
}
}
function backgroundline() {
if (spinNumber % 2 === 0) {
backline="#D3D3D3"
} else {
backline="#E5E4E2";
}
}
function spin(number) {
// Determine the color of the number
var color = roulette(number);
spinNumber= spinNumber+1;
bankRoll=bankRoll-10;
backgroundline();
// Display the result
var resultsDiv = document.getElementById("results");
var resultHTML = `${number}`;
resultHTML = `<div style="padding:10px 0; background: ${backline};vertical-align:middle;margin-bottom:- 20px;">
<div style="padding:5px; display: inline-block; background: yellow; color:black;vertical-align:middle; width:30px; text-align:right;">${spinNumber}</div>
<div style="margin: 0 10px; display:inline-block; width: 70px; text-align:center;vertical-align:middle">£ ${bankRoll}</div>
<div style="color: white; padding: 5px; display: inline-block; width:30px; padding-top:15px;vertical-align:middle; font-size: 25px; font-weight:600; height:30px; text-align:center; background-color: ${color}; ">${resultHTML}</div>
</div>
<br style="height:0px;"/>`;
resultsDiv.innerHTML += resultHTML;
}
// Set up the buttons
for (let i = 0; i <= 36; i++) {
let button = document.createElement("button");
button.innerHTML = i;
button.style.backgroundColor = roulette(i);
button.addEventListener("click", function() {
spin(i);
});
document.getElementById("numberButtons").appendChild(button);
}
function closeModal() {
// Get the modal element
var modal = document.getElementById("modal");
// Remove the modal element from the DOM
modal.remove();
}
</script>
</body>
</html>
I've tried a lot of solutions on Stack Overflow and other areas of the internet that I think might work, but it doesn't seem to want to.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
You must call this function after adding elements in the Results div.
Add this function window.scrollTo(0, document.body.scrollHeight) after this line resultsDiv.innerHTML = resultHTML;