How to make blocks random heights

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I am trying to code the google dino game replica. I want to make the blocks or codes to be random heights. How to i do that?

Here is the code I am using:

HTML:

 <!DOCTYPE html>
<html lang="en" onclick="jump()">
<head>
    <meta charset="UTF-8">
    <title>Jump Game</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="game">
        <div id="character"></div>
        <div id="block"></div>
    </div>
    <p>Score: <span id="scoreSpan"></span></p>
</body>
<script src="script.js"></script>
</html>

_____________________________________________________________________________

CSS:

 *{
    padding: 0;
    margin: 0;
    overflow-x: hidden;
}
.game{
    width: 500px;
    height: 200px;
    border: 1px solid black;
    margin: auto;
}
#character{
    width: 20px;
    height: 50px;
    background-color: red;
    position:relative;
    top: 150px;
}
.animate{
    animation: jump 0.1s linear;
}
@keyframes jump{
    0%{top: 150px;}
    30%{top: 100px;}
    70%{top: 100px;}
    100%{top: 150px;}
}

#block{
    background-color: blue;
    width: 20px;
    height: 20px;
    position: relative;
    top: 130px;
    left: 500px;
    animation: block 3s infinite linear;
}
@keyframes block{
    0%{left: 500px}
    100%{left: -20px}
}
p{
    text-align: center;
}

_____________________________________________________________________________

JAVASCRIPT:

 var character = document.getElementById("character");
var block = document.getElementById("block");
var counter=0;
function jump(){
    if(character.classList == "animate"){return}
    character.classList.add("animate");
    setTimeout(function(){
        character.classList.remove("animate");
    },300);
}
var checkDead = setInterval(function() {
    let characterTop = parseInt(window.getComputedStyle(character).getPropertyValue("top"));
    let blockLeft = parseInt(window.getComputedStyle(block).getPropertyValue("left"));
    if(blockLeft<20 && blockLeft>-20 && characterTop>=130){
        block.style.animation = "none";
        alert("Game Over. score: "+Math.floor(counter/100));
        counter=0;
        block.style.animation = "block 1s infinite linear";
    }else{
        counter++;
        document.getElementById("scoreSpan").innerHTML = Math.floor(counter/100);
    }
}, 10);

var defaultMax = Math.exp(6) / 12;  // e⁶ / 12 = 33.5em

// random buffer to give for spacing.
// growth is inverse exponential, so larger is less likely
function buffer(min=0.1, max=defaultMax, mult=1) {
  return Math.min(max, Math.max(min,
    min / 2 + Math.exp(Math.random() * 6) * Math.random() * mult / 12
  ))+"em";
}
function randomize() {
  var block = document.getElementsByClassName("block");
  for (var p = 0; p < block.length; p++) {
    // random buffered margins, ordered: top right bottom left.
    // top is at least 0.1em, right and bottom are at least 0.25em.
    // top and bottom are cut in half to limit lost vertical space.
    block[p].style.margin = buffer(0.1,  defaultMax, 0.5) + " "
                          + buffer(0.25) + " "
                          + buffer(0.25, defaultMax, 0.5) + " "
                          + buffer();
    // random width and height (with sane minimum size: 8em x 5em)
    block[p].style.width = buffer(8);
    block[p].style.height = buffer(5);
  }
}

What I have tried:

I have tired using these tutorials but could not get them to work:

- Randomizing in JavaScript - YouTube[^]

- Let's Create Random Emojis Project Using JavaScript #HuXnWebDev - YouTube[^]

Posted 2-May-23 11:43am

Paayas Vaidya

Updated 2-May-23 18:34pm

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OriginalGriff · Answer 1 · 2023-05-02T18:34:00

Solution 1

See here: JavaScript Math random() Method[^]

Posted 2-May-23 18:34pm

OriginalGriff