CODEWITHSUNDEEP
javascripthtmlcssrandomslideshow
CuttingTheAces
CuttingTheAces

Reputation: 51

Slideshow with random pics

So I made this little Slideshow with HTML/CSS/JS and I want to make it so that the 6 images appear randomly and not 1,2,3.. more like 2,3,1.. for example. Any help is appreciated. Many thanks in advance.

JS:

var imagecount = 1;
var total = 6;

function slide(x) {
    var Image = document.getElementById('img');
    imagecount = imagecount + x;
    if(imagecount > total){imagecount = 1;}
    if(imagecount < 1){imagecount = total;}
    Image.src = "images/img"+ imagecount +".jpg";
    ChangeText(imagecount);
}

window.setInterval(function slideA(x) {
    var Image = document.getElementById('img');
    imagecount = imagecount + 1;
    if(imagecount > total){imagecount = 1;}
    if(imagecount < 1){imagecount = total;}
    Image.src = "images/img"+ imagecount +".jpg";
    ChangeText(imagecount);
}, 3000);

function ChangeText(imgNum){
    var allImagesAndText = {1: "Seltene römische Goldmünze", 2: "Römische Funde", 3: "Römische Wandmalerei", 4: "Tutanchamun", 5: "Cheops Pyramide", 6: "Ägyptische Malerei"};
    document.getElementById("text1").innerHTML = allImagesAndText[imgNum];
}

CSS:

#container {
  height: 450px;
  width: 650px;
  margin: 20px auto;
  position: relative;
  z-index: 1;
  border: 10px solid #000;
  border-radius: 10px;
}
#img {
  height: 450px;
  width: 650px;
}
#left_holder {
  height: 450px;
  width: 100px;
  position: absolute;
  left: 0px;
  top: 0px;
}
#right_holder {
  height: 450px;
  width: 100px;
  position: absolute;
  right: 0px;
  top: 0px;
}
.left {
  height: 50px;
  width: 50px;
  position: absolute;
  top: 40%;
  left: 0px;
}
.right {
  height: 50px;
  width: 50px;
  position: absolute;
  top: 40%;
  right: 0px;
}
#text1 {
  position: absolute;
  color: #fff;
  font-size: 32px;
  background-color: #000;
  opacity: 0.5;
  left: 37%;
  z-index: 2;
}

HTML:

<div id="container">
  <div id="text1">Text</div>
  <img src="images/img1.jpg" id="img" />
  <div id="left_holder">
    <img onClick="slide(-1)" class="left" src="images/arrow_left.png" />
  </div>
  <div id="right_holder">
    <img onClick="slide(1)" class="right" src="images/arrow_right.png" />
  </div>
</div>

Upvotes: 1

Views: 133

Answers (2)

Jakob
Jakob

Reputation: 3546

You can create unique random image slider. So it doesn't repeat image multiple times (Soham's answer is fine but it will repeat same image multiple times in a row).

Something like this:

var imagecount = 1;
var total = 6;
var uniqueRandoms = [];

function makeUniqueRandom() {
    if (!uniqueRandoms.length) {
        for (var i = imagecount; i <= total; i++) {
            uniqueRandoms.push(i);
        }
    }
    var index = Math.floor(Math.random() * uniqueRandoms.length);
    var val = uniqueRandoms[index];

    uniqueRandoms.splice(index, 1);

    return val;
}

I used this SO answer.

And then in your code just call that function where you need it.

Example with your code just for autoslide is here https://jsfiddle.net/2gra4wk1/

Upvotes: 1

Soham Banerjee
Soham Banerjee

Reputation: 15

You can add a function:-

    function generateRandom(){
        var x = Math.floor((Math.random() * 6) + 1); //generates random number from 1 to 6
        return x;
    }

And then call this function and use appropriately

Upvotes: 1

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