i want to loop a series of images in javascript. below is the code i have so far
<html>
<head>
</head>
<body>
<img src="images/image1.jpg" alt="rotating image" width="600" height="500" id="rotator">
<script type="text/javascript">
(function() {
var rotator = document.getElementById('rotator'); // change to match image ID
//var imageDir = 'images/'; // change to match images folder
var delayInSeconds = 1; // set number of seconds delay
// list image names
var images = ['1.jpg','2.jpg', '3.jpg', '4.jpg'];
// don't change below this line
var num = 0;
var changeImage = function() {
var len = images.length;
rotator.src = images[num++];
if (num == len) {
num = 0;
}
};
setInterval(changeImage, delayInSeconds * 50);
})();
</script>
</body>
</html>
It can only display the image i have declared in the "var image". if i have 10000 image , how to do that . I have tried using a 'for' loop but it failed .. any suggestions ?? thanks in advance
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update version that Joseph recommend :
<html>
<head>
</head>
<body>
<img src="images/1.jpg" alt="rotating image" width="600" height="500" id="rotator">
<script type="text/javascript">
(function() {
var rotator = document.getElementById('rotator'), //get the element
var delayInSeconds = 1, //delay in seconds
var num = 0, //start number
var len = 9999; //limit
setInterval(function(){ //interval changer
num = (num === len) ? 0 : num; //reset if limit reached
rotator.src = num + '.jpg'; //change picture
num++; //increment counter
}, delayInSeconds * 1000);
}());
</script>
</body>
</html>
Assuming that images have the same sequential filenames, this would be best when looping through a lot of them:
(function() {
var rotator = document.getElementById('rotator'), //get the element
dir = 'images/', //images folder
delayInSeconds = 1, //delay in seconds
num = 0, //start number
len = N; //limit
setInterval(function(){ //interval changer
rotator.src = dir + num+'.jpg'; //change picture
num = (num === len) ? 0 : ++num; //reset if last image reached
}, delayInSeconds * 50);
}());
AFAIK, you can use the same logic to display the images in small chunk as your browser will crash if you try to display all 10000 images at the same time.So display 5-10 images on the page with your current logic and ask the user to retrieve next set.You can see this kind of implementation in many image sharing applications.Hope this will help you
(function () {
var rotator = document.getElementById('rotator'); // change to match image ID
var imgDir = 'images/'; // change to match images folder
var delayInSeconds = 1; // set number of seconds delay
// Yes I made changes below this line
var num = 0;
var changeImage = function () {
rotator.src = imgDir + num++ + ".jpg";
//var len = rotator.src.length;
if (num == 5) {
num = 0;
}
};
setInterval(changeImage, delayInSeconds * 1000);
})();
Related
I need to create a web page with a button that says "start game". When this button is clicked, 5 images I have downloaded (img1.png...img5.png) must appear randomly, one at a time, every half a second. Here is my code so far, any help would be greatly appreciated!
<html>
<head>
<script>
var rollImagesSchedule;
var rollImagesCounter;
function rollImagesAnimation(){
rollImagesCounter = 0;
rollImagesSchedule = setInterval(500);
}
function rollImages(){
var imageValue = Math.floor(Math.random() * 5) + 1;
var imageFile = "img" + imageValue + ".png";
var theImage = document.getElementById("display");
theImage.src = imageFile;
rollImagesCounter = rollImagesCounter + 1;
if (rollImagesCounter == 10){
clearInterval(rollImagesSchedule);
}
}
</script>
</head>
<body>
<h1>Game</h1>
<button onClick="rollImagesAnimation()">Start frog game</button>
<br /><br />
<img id="display" style='width:200px; height:200px;'>
</body>
</html>
I think you're getting stuck with the way to use setInterval.
You can try to create a counter outside setInterval function, and nest all of your works inside of it. And the counter should be checked at the top.
function rollImages(){
var counter = 0;
var interval = setInterval(function () {
if (counter === 10) {
clearInterval(interval);
return;
}
var imageValue = Math.floor(Math.random() * 5) + 1;
var imageFile = "img" + imageValue + ".png";
var theImage = document.getElementById("display");
theImage.src = imageFile;
counter++;
}, 500);
}
Then, you can edit the way to catch event rollImages:
<button onClick="rollImages()">Start frog game</button>
My English is not very good, so I might misunderstand your question. Let me answer it according to what I understand.
Your requirement is to randomly display one of the five pictures every 500 milliseconds, right? If so, you can try this idea:
Put the src of 5 pictures into an array
var imageSrcs = ["image1","image2","image3","image4","image5"];
Every 500 milliseconds, execute the following function:
function rollImages(){
// Randomly generate a random number between 0-4
int index = Math.floor(Math.random() * 5) + 1;
var theImage = document.getElementById("display");
// Use random numbers as subscripts and take values from the array
theImage.src = imageSrcs[index];
}
You can store the images name files into an array and then setInterval a random number and assign the source of an img html element:
var list = [
"image1.jpg",
"image2.jpg",
"image3.jpg",
];
var i = 0;
function changeImgs() {
var imageValue = Math.floor(Math.random() * list.length - 1) + 1;
image.src = list[imageValue];
}
setInterval(function() {
changeImgs()
}, 2000);
window.onload = changeImgs;
<img id="image" class="size">
I have to make a program which is able to present an animation once opened.
Here the code that I have so far, but I am not sure how to fix it to automatically show the pictures and I am not allowed to use a button or hover over the image to change it , and I'm not allowed to use a premade gif or a gif at all
var index = 0;
var ImageList = ["http://www.iconsplace.com/icons/preview/orange/happy-256.png", "http://www.iconsplace.com/icons/preview/orange/sad-256.png"];
var image1 = document.getElementById("myImage");
function onTimer() {
timerValue++;
para.innerHTML = timerValue;
if (timerValue >= 30) {
img.src("http://www.iconsplace.com/icons/preview/orange/happy-256.png");
} else if (timer <= 60) {
img.src("http://www.iconsplace.com/icons/preview/orange/sad-256.png");
} else {
img.src("http://www.iconsplace.com/icons/preview/orange/happy-256.png");
}
}
<img id="myImage" src="http://www.iconsplace.com/icons/preview/orange/happy-256.png" style="width:200px">
You can use an interval:
window.onload = function(){
var index = 0;
var ImageList = ["Images/happy.png", "Images/sad.png"];
var image1 = document.getElementById("myImage");
var a = 0;
setInterval(function(){
a++;
image1.src = ImageList[a % ImageList.length];
}, 30000);
}
It changes the image per 30 seconds.
You have the two images in an array. USE it!
var index = 0;
var ImageList = ["http://www.iconsplace.com/icons/preview/orange/happy-256.png", "http://www.iconsplace.com/icons/preview/orange/sad-256.png"];
window.onload=function() { // page has finished loading, image is available
var image1 = document.getElementById("myImage");
var tId=setInterval(function() {
index=index==0?1:0; // if 0 then 1 else 0
// for more images instead use:
// index++; if (index>=ImageList.length)index=0;
image1.src=ImageList[index]; // how to set the image src
},5000); // every 5 seconds
}
<img id="myImage" src="http://www.iconsplace.com/icons/preview/orange/happy-256.png" style="width:200px">
I'm writing a webpage and looking to autorefresh an image in my directory every second. I have code written but I'm not sure why its not working.
<html>
<SCRIPT language="JavaScript" type="text/javascript">
var t = 1 // Interval in Seconds
images = new Array('foo.png'); //URLs of the Images
function Start() {
tmp = new Date();
tmp = "?"+tmp.getTime();
for (i=1;i<image.length;i++){
document.getElementById("img"+i).src = images[i]+tmp;
}
setTimeout("Start()", t*1000)
}
Start();
</SCRIPT>
<body>
<IMG src="foo.png" border="1" name="refresh" id="img1">
</body>
</html>
The problem is, array index starts from 0 not from 1, your looping variable start with 1, but the array has only 1 item at index 0, so images[1] will return undefined.
var t = 1 // Interval in Seconds
images = new Array('foo.png'); //URLs of the Images
function Start() {
var tmp = "?" + new Date().getTime();
for (var i = 0; i < image.length; i++) {
document.getElementById("img" + (i + 1)).src = images[i] + tmp;
}
setTimeout("Start()", t * 1000)
}
Start();
As mentioned by #Arun P Johny, array index starts with zero.
You used i<image.length in for loop, but your var name is images, Note that extra s.
Since the value of i starts from 0, set id of <img> to img0
<html>
<SCRIPT language="JavaScript" type="text/javascript">
var t = 1 // Interval in Seconds
images = new Array('foo.png'); //URLs of the Images
function Start() {
tmp = new Date();
tmp = "?"+tmp.getTime();
for (i=0;i<images.length;i++){
document.getElementById("img"+i).src = images[i]+tmp;
}
setTimeout(Start, t*1000)
}
Start();
</SCRIPT>
<body>
<IMG src="foo.png" border="1" name="refresh" id="img0">
</body>
</html>
This will refresh real-time any image when an image change has been made.
<script>
setInterval(function(){
$("#logo").each(function(){
var timeStamp = (new Date()).getTime();
$(this).attr("src", $(this).attr("src") + timeStamp );
});
}, 1000);
</script>
This will refresh the div to prevent a long URL from being generated by ?_=' +Math.random()+'.
<script>
$(document).ready(function(){
setInterval(function(){
$("#myDIV").load(window.location.href + " #myDIV" );
}, 80000);
});
</script>
The image.
<div id="myDIV">
<img id="logo" src="logo.png?_=' +Math.random()+'" width="100%" height="auto" alt="onerror="this.onerror=null;this.src="error.png";"/>
</div>
I am studying for GCSE computing and need to be able to change the interval between different images. My code at the moment looks something like this...
<!DOCTYPE html>
<html>
<body>
<h1> Traffic lights can change on their own </h1>
<img src="RED.jpg" id= "traffic" width="155" height="198">
<script>
var myImage = document.getElementById("traffic");
var imageArray = ["RED.jpg", "RED-ORANGE.jpg", "GREEN.jpg", "ORANGE.jpg"];
var imageIndex = 0;
function changeImage()
{
myImage.setAttribute("src",imageArray[imageIndex]);
imageIndex++;
if (imageIndex >= imageArray.length) {
imageIndex = 0;
}
}
setInterval(changeImage,1000);
</script>
</body>
</html>+
If you could include some of this code whilst changing the intervals that would be ideal.
Supposing you want to solve this using Javascript only:
Source documentation
// Save the var timeoutID = window.setTimeout(code, [delay]);
var imageTimers = [500, 1000, 2000, 4000];
var timeTochange = Math.random() * 3000; // or whatever you want to use...
var aTimer = setTimeout(changeImage, timeTochange);
// On the changeImage, alter the timeTochange var.
function changeImage() {
// ...stuffs...
clearTimeout(aTimer);
timeTochange = imageTimers[imageIndex];
aTimer = setTimeout(changeImage, timeTochange);
}
I have the following javascript. It works well when I am cycling between 2 images, but when I add a third it does not work correctly.
Here is my CSS:
img {
-webkit-transition-property: opacity;
-webkit-transition-duration: 2s;
position: absolute;
width: 320px;
height: auto;
}
img.fade-out {
opacity: 0;
}
img.fade-in {
opacity: 1;
}
Here is my javascript, which seems to work but seems laggy and definately not an elegant solution.
</head><body style="color: black">
<img id="one" class="fade-out" src="Wallpaper.png"/>
<img id="two" class="fade-out" src="Wallpaper0.png"/>
<img id="three" class="fade-out" src="Wallpaper1.png"/>
<script>
var images = ['Wallpaper.png', 'Wallpaper0.png', 'Wallpaper1.png'];
var index = 0;
var fade_in = one;
var fade_out = two;
var fade_foo = three;
fade_in.src = images[0];
fade_out.src = images[images.length - 1];
var fade = function () {
fade_in.src = images[index];
index = (index + 1) % images.length;
fade_in.className = 'fade-out';
fade_out.className = 'fade-in';
fade_foo.className = 'fade-out';
var fade_tmp = fade_in;
fade_in = fade_out;
fade_out = fade_foo;
fade_foo = fade_tmp;
setTimeout(fade, 15000);
};
fade();
</body></html>
For one thing, you're not changing fade_out.src. Try something like this:
fade_in.src = images[0];
fade_out.src = images[1]; // let's use image next to current for fade-out
var fade = function () {
fade_in.src = images[index];
index = (index + 1) % images.length;
fade_out.src = images[index]; // put next to current image into fade-out
// Code below does something misterious.
// You first switch classes between two img's, then switch variables themselves
// Why?
//fade_in.className = 'fade-out';
//fade_out.className = 'fade-in';
//var fade_tmp = fade_in;
//fade_in = fade_out;
//fade_out = fade_tmp;
setTimeout(fade, 15000);
};
Can't tell more since I don't know what exactly you're doing.
It seems you're only displaying one image at a time, so you don't need two variables, one will do. You just need to fade out the current image and bring in a new image:
var index = -1, count = /* total number of images */;
var image = null;
function fade() {
if (image != null)
image.className = 'fade-out';
index = (index + 1) % count;
image = document.getElementById('image-' + index);
image.className = 'fade-in';
setTimeout(fade, 15000);
}
fade();
This assumes that you have set up all the images in HTML as follows:
<img id="image-0" class="fade-out" src="..." />
<img id="image-1" class="fade-out" src="..." />
<img id="image-2" class="fade-out" src="..." />
...
Note that you can achieve cross-fading only if you have several images preloaded, as in the above example. If you use only one image and change the source, the previous image will be lost when you try to fade in the new one.
you're not waiting for you transitions to finish before you swap the source. we just need to rearrange the order of things.
var fade = function() {
fade_in.className = 'fade-out';
fade_out.className = 'fade-in';
setTimeout(function() {
index = (index + 1) % images.length;
fade_in.src = images[index]; // should be completely invisible at this time
var fade_tmp = fade_in;
fade_in = fade_out;
fade_out = fade_tmp;
}, 2000); // 2 seconds, same as your transition time
setTimeout(fade, 15000);
};
setTimeout(fade, 15000);
here the only work that the fade method does is to change the classes, which initiates the transitions. we set a delay that matches your transition time to update the index and swap the image source.
edits: i guess i'm not making it clear what's going on and the assumptions i'm making. here's my complete html except for the provided css which is the same. i also fixed an issue with image order since the last example.
<body>
<img id="one" class="fade-out" /><img id="two" class="fade-out" />
<script>
var images = ['16jog8h.jpg', '20_11_2007_0044537001195507712_joe_baran.jpg', '400davesrig.jpg'];
var index = 0;
var fade_in = document.getElementById('one');
var fade_out = document.getElementById('two');
// fade_in.src = images[0];
fade_out.src = images[0];
var fade = function() {
fade_in.className = 'fade-out';
fade_out.className = 'fade-in';
setTimeout(function() {
index = (index + 1) % images.length;
fade_in.src = images[index];
var fade_tmp = fade_in;
fade_in = fade_out;
fade_out = fade_tmp;
}, 2000);
setTimeout(fade, 5000);
};
fade();
</script>
</body>