-4

I am not sure how I would ask this question.

Here are 3 gradient backgrounds:

How would I have a random one load when the page loads?

How would I do that in the code? https://jsfiddle.net/mdjno3bL/

That is all I am trying to figure out how to do.

Is there a way to do that?

How would it be written without jQuery?

.play1 {
  --color-a: orange;
  --color-b: black;
  --color-c: green;
  --color-d: black;
}

.play2 {
  --color-a: purple;
  --color-b: black;
  --color-c: purple;
  --color-d: black;
}

.play3 {
  --color-a: green;
  --color-b: black;
  --color-c: green;
  --color-d: black;
}


.play1 {
  --color-a: orange;
  --color-b: black;
  --color-c: green;
  --color-d: black;
}

.play2 {
  --color-a: purple;
  --color-b: black;
  --color-c: purple;
  --color-d: black;
}

.play3 {
  --color-a: green;
  --color-b: black;
  --color-c: green;
  --color-d: black;
}

html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
}


body  .bg {
  content: "";
  position: fixed;
  /*z-index: 1;*/
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;

  background-size: 165px 165px;
  background-image:
    linear-gradient(var(--color-a) 5px, #0000 5px),
    linear-gradient(90deg, var(--color-a) 5px, #0000 5px),

    linear-gradient(var(--color-b) 10px, #0000 10px 160px, var(--color-b) 160px),
    linear-gradient(90deg, var(--color-b) 10px, #0000 10px 160px, var(--color-b) 160px),

    linear-gradient(var(--color-c) 15px, #0000 15px 155px, var(--color-c) 155px),
    linear-gradient(90deg, var(--color-c) 15px, #0000 15px 155px, var(--color-c) 155px),

    linear-gradient(var(--color-d) 20px, #0000 20px 150px, var(--color-d) 150px),
    linear-gradient(90deg, var(--color-d) 20px, #0000 20px 150px, var(--color-d) 150px),

    linear-gradient(var(--color-a) 25px, #0000 25px 145px, var(--color-a) 145px),
    linear-gradient(90deg, var(--color-a) 25px, #0000 25px 145px, var(--color-a) 145px),

    linear-gradient(var(--color-b) 30px, #0000 30px 140px, var(--color-b) 140px),
    linear-gradient(90deg, var(--color-b) 30px, #0000 30px 140px, var(--color-b) 140px),

    linear-gradient(var(--color-c) 35px, #0000 35px 135px, var(--color-c) 135px),
    linear-gradient(90deg, var(--color-c) 35px, #0000 35px 135px, var(--color-c) 135px),

    linear-gradient(var(--color-d) 40px, #0000 40px 130px, var(--color-d) 130px),
    linear-gradient(90deg, var(--color-d) 40px, #0000 40px 130px, var(--color-d) 130px),

    linear-gradient(var(--color-a) 45px, #0000 45px 125px, var(--color-a) 125px),
    linear-gradient(90deg, var(--color-a) 45px, #0000 45px 125px, var(--color-a) 125px),

    linear-gradient(var(--color-b) 50px, #0000 50px 120px, var(--color-b) 120px),
    linear-gradient(90deg, var(--color-b) 50px, #0000 50px 120px, var(--color-b) 120px),

    linear-gradient(var(--color-c) 55px, #0000 55px 115px, var(--color-c) 115px),
    linear-gradient(90deg, var(--color-c) 55px, #0000 55px 115px, var(--color-c) 115px),

    linear-gradient(var(--color-d) 60px, #0000 60px 110px, var(--color-d) 110px),
    linear-gradient(90deg, var(--color-d) 60px, #0000 60px 110px, var(--color-d) 110px),

    linear-gradient(var(--color-a) 65px, #0000 65px 105px, var(--color-a) 105px),
    linear-gradient(90deg, var(--color-a) 65px, #0000 65px 105px, var(--color-a) 105px),

    linear-gradient(var(--color-b) 70px, #0000 70px 100px, var(--color-b) 100px),
    linear-gradient(90deg, var(--color-b)70px, #0000 70px 100px, var(--color-b) 100px),

    linear-gradient(var(--color-c) 75px, #0000 75px 95px, var(--color-c) 95px),
    linear-gradient(90deg, var(--color-c) 75px, #0000 75px 95px, var(--color-c) 95px),

    linear-gradient(var(--color-d) 80px, #0000 80px 90px, var(--color-d) 90px),
    linear-gradient(90deg, var(--color-d) 80px, #0000 80px 90px, var(--color-d) 90px),

    linear-gradient(var(--color-a), var(--color-a));
}
<div class="bg play1 "></div>
Eve Ninnall
  • 1
  • 3
  • 20
  • Does this answer your question? [Apply a random class to every element specified](https://stackoverflow.com/questions/7686592/apply-a-random-class-to-every-element-specified) – Heretic Monkey Jan 12 '22 at 16:44
  • No. That uses JQuery, I'm not using JQuery. – Eve Ninnall Jan 12 '22 at 16:44
  • @EveNinnall, check my answer again. I updated several things. Tell me if it works – James Jan 12 '22 at 16:49
  • One of the things you'll want to learn as you progress in a career in software development is the ability to see the forest for the trees. To find the algorithm in the answers, ignoring the specific technology, like jQuery. Maybe [Getting a random value from a JavaScript array](https://stackoverflow.com/q/4550505/215552) is sufficient. You can get the class from an array of possible classes. Since you show no effort toward solving the problem yourself, we don't know how much help you need. – Heretic Monkey Jan 12 '22 at 16:56

1 Answers1

1

I assume you want to randomly select 1 background from the above three class play,play2 and play3

window.addEventListener("DOMContentLoaded", function(event) {
     let ran = Math.floor(Math.random()*3+1)
     document.querySelector('div').classList.add('play'+ran)
     console.log(document.querySelector('div'))
     })
.play1 {
  --color-a: orange;
  --color-b: black;
  --color-c: green;
  --color-d: black;
}

.play2 {
  --color-a: purple;
  --color-b: black;
  --color-c: purple;
  --color-d: black;
}

.play3 {
  --color-a: green;
  --color-b: black;
  --color-c: green;
  --color-d: black;
}

html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
}


body  .bg {
  content: "";
  position: fixed;
  /*z-index: 1;*/
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;

  background-size: 165px 165px;
  background-image:
    linear-gradient(var(--color-a) 5px, #0000 5px),
    linear-gradient(90deg, var(--color-a) 5px, #0000 5px),

    linear-gradient(var(--color-b) 10px, #0000 10px 160px, var(--color-b) 160px),
    linear-gradient(90deg, var(--color-b) 10px, #0000 10px 160px, var(--color-b) 160px),

    linear-gradient(var(--color-c) 15px, #0000 15px 155px, var(--color-c) 155px),
    linear-gradient(90deg, var(--color-c) 15px, #0000 15px 155px, var(--color-c) 155px),

    linear-gradient(var(--color-d) 20px, #0000 20px 150px, var(--color-d) 150px),
    linear-gradient(90deg, var(--color-d) 20px, #0000 20px 150px, var(--color-d) 150px),

    linear-gradient(var(--color-a) 25px, #0000 25px 145px, var(--color-a) 145px),
    linear-gradient(90deg, var(--color-a) 25px, #0000 25px 145px, var(--color-a) 145px),

    linear-gradient(var(--color-b) 30px, #0000 30px 140px, var(--color-b) 140px),
    linear-gradient(90deg, var(--color-b) 30px, #0000 30px 140px, var(--color-b) 140px),

    linear-gradient(var(--color-c) 35px, #0000 35px 135px, var(--color-c) 135px),
    linear-gradient(90deg, var(--color-c) 35px, #0000 35px 135px, var(--color-c) 135px),

    linear-gradient(var(--color-d) 40px, #0000 40px 130px, var(--color-d) 130px),
    linear-gradient(90deg, var(--color-d) 40px, #0000 40px 130px, var(--color-d) 130px),

    linear-gradient(var(--color-a) 45px, #0000 45px 125px, var(--color-a) 125px),
    linear-gradient(90deg, var(--color-a) 45px, #0000 45px 125px, var(--color-a) 125px),

    linear-gradient(var(--color-b) 50px, #0000 50px 120px, var(--color-b) 120px),
    linear-gradient(90deg, var(--color-b) 50px, #0000 50px 120px, var(--color-b) 120px),

    linear-gradient(var(--color-c) 55px, #0000 55px 115px, var(--color-c) 115px),
    linear-gradient(90deg, var(--color-c) 55px, #0000 55px 115px, var(--color-c) 115px),

    linear-gradient(var(--color-d) 60px, #0000 60px 110px, var(--color-d) 110px),
    linear-gradient(90deg, var(--color-d) 60px, #0000 60px 110px, var(--color-d) 110px),

    linear-gradient(var(--color-a) 65px, #0000 65px 105px, var(--color-a) 105px),
    linear-gradient(90deg, var(--color-a) 65px, #0000 65px 105px, var(--color-a) 105px),

    linear-gradient(var(--color-b) 70px, #0000 70px 100px, var(--color-b) 100px),
    linear-gradient(90deg, var(--color-b)70px, #0000 70px 100px, var(--color-b) 100px),

    linear-gradient(var(--color-c) 75px, #0000 75px 95px, var(--color-c) 95px),
    linear-gradient(90deg, var(--color-c) 75px, #0000 75px 95px, var(--color-c) 95px),

    linear-gradient(var(--color-d) 80px, #0000 80px 90px, var(--color-d) 90px),
    linear-gradient(90deg, var(--color-d) 80px, #0000 80px 90px, var(--color-d) 90px),

    linear-gradient(var(--color-a), var(--color-a));
}
<div class="bg"></div>
James
  • 2,732
  • 2
  • 5
  • 28
  • How would it be written without jQuery? – Eve Ninnall Jan 12 '22 at 16:37
  • @EveNinnall, I am not using Jquery. It is just a window event that being executed when the document.loaded. But if you are looking for an easier solution, I could remove the `DOMContentLoaded` – James Jan 12 '22 at 16:38
  • Yes you are. $ is JQuery – Eve Ninnall Jan 12 '22 at 16:39
  • @EveNinnall, I updated my answer to make it easier for you to understand. Does it solve your confusion now? – James Jan 12 '22 at 16:39
  • 2
    The `player${ran}` isn't JQuery, it's a way of using [a variable in a string](https://stackoverflow.com/questions/3304014/how-to-interpolate-variables-in-strings-in-javascript-without-concatenation) – 0stone0 Jan 12 '22 at 16:40
  • @EveNinnall, wonder if your question be solved:) – James Jan 13 '22 at 04:09