CODEWITHSUNDEEP
javascriptarrays
Martin Erlic
Martin Erlic

Reputation: 5667

Multiple image arrays, randomize images on single button click

As you can see, I have three arrays which store three separate images each. Currently, you can cycle through each array by mouse-clicking the image to get a new image each time. What I want to do is incorporate the "Random!" button below to ask each array to change to a random image from within their respective array, and to do this simultaneously. So say you click "Random!" and then each array will pick a random image from within itself and display it.

I'm not sure how to even go about doing this. Any thoughts?

<script type="text/javascript">
    imgs=Array("pic1.jpg","pic2.jpg","pic3.jpg");
    var x=0;

    function change() {
    document.getElementById("img").src=imgs[++x];

    if (x==2) {
        x=-1;
    }
    }
    if (!imgs[x+1]) {
        x=-1;
    }
</script>

<img src="pic1.jpg" id="img" onmousedown="change()" style="cursor: pointer;">
<img src="" id="img" alt="" onmousedown="change()"><br>

<!-- /slider -->

<script type="text/javascript">
    imgs1=Array("pic4.jpg","pic5.jpg","pic6.jpg");
    var x1=0;

    function change1() {
    document.getElementById("img1").src=imgs1[++x1];

    if (x1==2) {
        x1=-1;
    }
    }
    if (!imgs1[x1+1]) {
        x1=-1;
    }
</script>

<img src="pic4.jpg" id="img1" onmousedown="change1()" style="cursor: pointer;">
<img src="" id="img1" alt="" onmousedown="change1()"><br>

<!-- /slider1 -->

<script type="text/javascript">
    imgs2=Array("pic7.jpg","pic8.jpg","pic9.jpg");
    var x2=0;

    function change2() {
    document.getElementById("img2").src=imgs2[++x2];

    if (x2==2) {
        x2=-1;
    }
    }
    if (!imgs2[x2+1]) {
        x2=-1;
    }
</script>

<img src="pic7.jpg" id="img2" onmousedown="change2()" style="cursor: pointer;">
<img src="" id="img2" alt="" onmousedown="change2()"><br>

<!-- /slider2 -->

    <a href="#" data-role="button">Random!</a>

Upvotes: 0

Views: 400

Answers (1)

Collierre
Collierre

Reputation: 956

You can use a randomiser function to pick a random array index:

function getRandomIndex(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

So in your change functions you can then do:

document.getElementById("img1").src=imgs1[getRandomIndex(0,imgs1.length - 1)];

Upvotes: 1

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