I am creating an animation by using setInterval.
var roman_numeral = document.getElementById('roman_numeral');
var i = 1
var generation = 1
var preload;
setInterval( async function (a) {
roman_numeral.innerHTML = romanize(i);
console.log(i);
if(i == 1){
preload = new Preloader(generation+1, "generation")
console.log("The code stops here");
//The code waits here; Seems like synchronus
}
i++
if(i == 1000){
i = 1;
generation ++;
preload.add()
}
if(generation == 1035){
i = 1;
generation = 1
}
}, 10)
I made a class for preloading images, but when creating a new instance of the class, the setInterval seems to run synchronus.
class Preloader {
constructor(gen, attach_id) {
this.gen = gen
this.attach_id = attach_id
this.preload();
}
async preload() {
let container = document.getElementById("generation_animation");
let preload_img = document.createElement("img");
preload_img.style.display = "none";
preload_img.style.width = "0px";
preload_img.id= "preload_generation";
preload_img.setAttribute("loading", "lazy")
container.appendChild(preload_img);
preload_img.src = "res/img/Generations/" + this.gen.toString() + ".png";
container.appendChild(preload_img)
console.log("aaaaaaaa");
}
add() {
let previous = document.getElementById("generation")
let current = document.getElementById("preload_generation");
current.style.width = "50%";
current.style.display = "";
current.classList.add("generations_class");
current.id = "generation";
previous.remove();
}
}
I want to load the image while performing the setInterval loop. How would i do that?
To continue on the question here. Since I am doing this for the first time, and I still consider myself a newbie in javascript I would like to know how to properly preload images for the browser.
This is my script:
$(document).ready(function () {
var imagesIndex = 0;
var loadedImages = new Array();
var nextImage = 0;
preload();
function preload() {
for (i = 0; i < 2; i++) {
if (nextImage < images.length) {
var img = new Image();
img.src = '/imagecache/cover/' + images[nextImage];
loadedImages[nextImage] = img;
++nextImage;
}
}
}
$('#forward').click(function() {
imagesIndex++;
preload();
if (imagesIndex > (loadedImages.length - 1)) {
imagesIndex = 0;
}
$('#image').attr({"src" : '/imagecache/cover/' + loadedImages[imagesIndex], "alt" : name});
});
$('#back').click(function() {
imagesIndex--;
if (imagesIndex < 0) {
imagesIndex = (loadedImages.length - 1);
}
$('#image').attr({"src" : '/imagecache/cover/' + loadedImages[imagesIndex], "alt" : name});
});
});
I am getting images from the global array images, and then using preload function to preload 2 at the time. I wonder what do I need to send as a source to the image element. Is that a src from the loadedImages array element or from the images array?
I want to draw image array with drawImage after all the images are loaded.There is a render problem with drawImage(), tried to solve with setTimeout() but its not working all the time.
Here is my code;
while(FocusItem.length>0)
{
FocusItem.pop();
}
ftx=canvas.getContext('2d');
focusImageBackground = new Image();
focusImageBackground.src = "./images/odaklanma/odaklanmaBackground.jpg";
if(RandomSoru==15)
finishSoru=true;
if(finishSoru)
{
RandomSoru = Math.floor((Math.random() * 15)+1);
tempRandomSoru=RandomSoru;
}
if(RandomSoru==tempRandomSoru)
{
RandomSoru = Math.floor((Math.random() * 15)+1);
}
var soru = new Object();
soru["image"] = new Image();
soru.image.src = './images/odaklanma/level/'+RandomSoru+'/soru.png';
soru["x"] = 341;
soru["y"] = 140;
FocusItem.push(soru);
var dogru = new Object();
dogru["image"] = new Image();
dogru.image.src = './images/odaklanma/level/'+RandomSoru+'/dogru.png';
dogru["x"] = xDogru;
dogru["y"] = 280;
FocusItem.push(dogru);
var yanlis = new Object();
yanlis["image"] = new Image();
yanlis.image.src = './images/odaklanma/level/'+RandomSoru+'/yanlis.png';
yanlis["x"] = xYanlis1;
yanlis["y"] = 280;
FocusItem.push(yanlis);
var yanlis2 = new Object();
yanlis2["image"] = new Image();
yanlis2.image.src = './images/odaklanma/level/'+RandomSoru+'/yanlis1.png';
yanlis2["x"] = xYanlis2;
yanlis2["y"] = 280;
FocusItem.push(yanlis2);
}
if(focusImageBackground.complete){
if(FocusItem[0].image.complete && FocusItem[1].image.complete && FocusItem[2].image.complete && FocusItem[3].image.complete)
drawFocus();
else
setTimeout(drawFocus,600);
}
else
focusImageBackground.onload=function(){
if(FocusItem[0].image.complete && FocusItem[1].image.complete && FocusItem[2].image.complete && FocusItem[3].image.complete)
drawFocus();
else
setTimeout(drawFocus,600);
}
function drawFocus(){
ftx.drawImage(focusImageBackground,0,0);
for (var i=0; i<FocusItem.length; i++){
FocusItem[i].image.onload=function(){
ftx.drawImage (FocusItem[i].image, FocusItem[i].x, FocusItem[i].y);
}
}
}
I'd suggest loading all your images, then when they are all done, you can call the rest of your code. I don't quite follow what you're trying to do with all the rest of your code, but here's a simple way to load an array of image URLs and know when they are done.
This is the general idea (I've left out lots of your code that has nothing to do with the central issue of knowing when all the images are loaded) and I've also tried to DRY up your code:
function createImagesNotify(srcs, fn) {
var imgs = [], img;
var remaining = srcs.length;
for (var i = 0; i < srcs.length; i++) {
img = new Image();
imgs.push(img);
img.onload = function() {
--remaining;
if (remaining == 0) {
fn(srcs);
}
};
// must set .src after setting onload handler
img.src = srcs[i];
}
return(imgs);
}
// here's your starting array of filenames
var fnames = ["soru.png", "dogru.png", "yanlis.png", "yanlis1.png"];
// insert your process to create RandomSoru here
var randomSoru = ....;
// build full urls array
var urls = [];
for (var i = 0; i < fnames; i++) {
urls.push('./images/odaklanma/level/' + RandomSoru + '/' + fnames[i]);
}
// load all images and call callback function when they are all done loading
var imgs = createImagesNotify(urls, function() {
// all images have been loaded here
// do whatever you want with all the loaded images now (like draw them)
});
This code is based on an earlier answer of mine here: Cross-browser solution for a callback when loading multiple images?
I am trying to preload a bunch of images, and then once they are FULLY loaded, change the contents of a div, here is my code so far, but it just throws my browser into an infinite loop. Any help would be great. Thanks!
var mydir ='slideshow_pics/';
var myArray = new Array();
myArray[0] = mydir+'0.jpg';
myArray[1] = mydir+'1.jpg';
myArray[2] = mydir+'2.jpg';
myArray[3] = mydir+'3.jpg';
myArray[4] = mydir+'4.jpg';
myArray[5] = mydir+'5.jpg';
myArray[6] = mydir+'6.jpg';
myArray[7] = mydir+'7.jpg';
var myWidth = new Array();
myWidth[0] = '470';
myWidth[1] = '450';
myWidth[2] = '450';
myWidth[3] = '500';
myWidth[4] = '550';
myWidth[5] = '450';
myWidth[6] = '800';
myWidth[7] = '300';
var myCheck = new Array();
function preloader(images){
var i = 0;
// start preloading
for(i=0; i<=images.length; i++){
imageObj = new Image();
imageObj.src=images[i];
imageObj.onLoad = check(i, images.length);
};
}
function checkimg(data, w) {
p=0;
z=0;
o = 'no';
var myImg = new Image();
myImg.src = data;
while (p == 0) {
if (myImg.naturalWidth == w) {
p = 1;
o = 'yes';
}
z++;
}
return o;
}
function check(e,i) {
if( e == i ){
if (document.getElementById('myss') != null) {
//now we need to make sure each image is fully loaded
for(i=0; i<=myArray.length; i++){
p=0;
z=0;
myCheck[i] = checkimg(myArray[i], myWidth[i]);
}//end foreach
if (myCheck.join('') == 'yesyesyesyesyesyesyesyes') {
document.getElementById('myss').innerHTML = '<embed src="RectangleSlideshow.swf" width="1028px" height="324px"></embed>';
}
}
};
}
I believe you need a sort of image pre-loading for a gallery.
I have that code implemented in my index web page:
http://www.becomingthebeast.com/index.html
See if it works for you.
Here is the script I have:
And I'm trying to assign event to each element in an array.
window.onload = sliding;
function sliding() {
document.getElementById('tag1').onmouseover = slideout;
document.getElementById('tag1').onmouseout = slidein;
}
And I tried do using the code below but that didn't work. It would trigger all the function buy it self.
window.onload = sliding;
var tags = new Array('tag1','tag2','tag3','tag4','tag5','tag6','tag7','tag8');// List of headings
var pics = new Array('popout1','popout2','popout3','popout4','popout5','popout6','popout7','popout8');// list of images that slide out
function sliding() {
for (var i = 0; i < tags.length; ++i) {
document.getElementById('tag1').onmouseover = setslideout(tags[i],pics[i]);
document.getElementById('tag1').onmouseout= setslidein(tags[i],pics[i]);
}
}
Here is full code
window.onload = sliding;
var tags = new Array('tag1','tag2','tag3','tag4','tag5','tag6','tag7','tag8');// List of headings
var pics = new Array('popout1','popout2','popout3','popout4','popout5','popout6','popout7','popout8');// list of images that slide out
function sliding() {
/*for (var i = 0; i < tags.length; ++i) {
setslideout(tags[i],pics[i]);
}/*/
document.getElementById('tag1').onmouseover = slideout;
document.getElementById('tag1').onmouseout = slidein;
}/*
function setslideout(tagsid,picsid){
document.getElementById(tagsid).onmouseover = slideout(tagsid,picsid);
}*/
function slideout(){
//alert('over '+ lid);
if(currpos('popout1') < 200){
document.getElementById('popout1').style.left = currpos('popout1') + 10 + "px";
var timer = setTimeout(slideout,10)
}else{
clearTimeout(timer);
}
}
function slidein(){
//alert('over '+ lid);
if(currpos('popout1') > 0){
document.getElementById('popout1').style.left = currpos('popout1') - 20 + "px";
var timer2 = setTimeout(slidein,10)
}else{
clearTimeout(timer2);
}
}
function currpos(element){
return document.getElementById(element).offsetLeft;
}
Here what im trying to to http://signsourceak.com/index2.html (first link in the drop down works )
Here's a version of your code modified to use closures, hopefully this does the trick:
window.onload = sliding;
var tags = new Array('tag1','tag2','tag3','tag4','tag5','tag6','tag7','tag8');// List of headings
var pics = new Array('popout1','popout2','popout3','popout4','popout5','popout6','popout7','popout8');// list of images that slide out
function sliding() {
for (var i = 0; i < tags.length; ++i) {
document.getElementById(tags[i]).onmouseover = (function(j){
return function(){
setslideout(tags[j], pics[j]);
}
})(i);
document.getElementById(tags[i]).onmouseout = (function(j){
return function(){
setslidein(tags[j], pics[j]);
}
})(i);
}
}