Hello I want to implement a carousel in Java Script.
When I launch the page the image loads very strangely and the bootstrap carousel does not work. Do I need to import something to make it work? If I make it static in HTML it works. However the task is to load the images with iiif. Also, there would be way too many images to make it static. Also, I would like to have a filter function implemented which only works dynamically.
Can someone help me how to implement the carousel?
Here is all the JS code:
'import bootstrap.js'
function changeIIIFInformation(iiif, size, quality) {
var index = iiif.indexOf('full')
iiif = iiif.substring(0, index)
iiif += "full/"
iiif += "pct:" +size.toString() +"/"
iiif += "0/"
iiif += quality +".jpg"
return iiif
}
function search_period(period, max_num, offset) {
var count = 0;
var link = ""
var div = document.createElement('div')
var div1 = document.createElement ('div')
var a=document.createElement('a')
var span1=document.createElement('span')
var span2=document.createElement('span')
a.setAttribute('class','carousel-control-prev')
a.setAttribute('href','#carouselExampleControls')
a.setAttribute('role','button')
a.setAttribute('data-slide','prev')
span1.setAttribute('class','carousel-control-prev-icon')
span1.setAttribute('aria-hidden', 'true')
span2.setAttribute('class','sr-only')
span2.innerHTML = 'Previous'
div.setAttribute('class', 'carousel slide')
div.setAttribute('data-ride', 'carousel')
div.setAttribute('id', 'carouselExampleControls')
div1.setAttribute('class','carousel-inner')
var h2 = document.createElement('h2')
var iiif = ""
h2.innerHTML = period
document.body.appendChild(h2)
const keys = Object.keys(urls);
for(const elem of keys) {
var label = urls[elem].label
for(const el of urls[elem].variants) {
if(el.label.includes('front')) {
iiif = el.url
}
}
if(!periods.hasOwnProperty(label)) {
continue;
}
if(periods[label] != period) {
continue;
}
if(count < offset) {
count+=1
continue
}
var div2= document.createElement ('div')
div2.setAttribute('class','carousel-item active')
link = changeIIIFInformation(iiif, 10, "default")
var figure = document.createElement('figure')
var figcaption = document.createElement('figcaption')
var linkToImage = document.createElement('a')
//linkToImage.setAttribute('#image', label)
linkToImage.setAttribute('href', 'annotator#'+label)
linkToImage.innerHTML = label
figcaption.appendChild(linkToImage)
var image = document.createElement('img')
image.setAttribute("id", "myimg");
image.setAttribute('src', link)
image.setAttribute('class','d-block w-100')
// figure.appendChild(image)
// figure.appendChild(figcaption)
div.appendChild(div1)
div.appendChild(a)
div1.appendChild(div2)
a.appendChild(span1)
a.appendChild(span2)
div2.appendChild(image)
figure.setAttribute("id", "myFigure");
count += 1;
if(count >= max_num+offset) {
break;
}
}
document.body.appendChild(div)
}
function clear_dom() {
var elements = document.getElementsByTagName('div')
var headings = document.getElementsByTagName('h2')
var buttons = document.getElementsByTagName('button')
while(buttons.length > 0) {
buttons.item(0).remove()
}
while(elements.length > 0) {
elements.item(0).remove()
}
while(headings.length > 0) {
headings.item(0).remove()
}
}
function show_initial_load() {
search_period('Ur III (ca. 2100-2000 BC)', )
}
function show_filtered(selected, offset) {
clear_dom()
search_period(selected, 10, offset)
var previous = document.createElement('button')
if(offset-10 < 0) {
previous.onclick = () => show_filtered(selected, 0)
} else {
previous.onclick = () => show_filtered(selected, offset-10)
}
previous.innerHTML = 'Previous'
document.body.appendChild(previous)
var next = document.createElement('button')
next.onclick = () => show_filtered(selected, offset+10)
next.innerHTML = 'More'
document.body.appendChild(next)
}
function update_view() {
var selected = document.getElementById('perriod-select').value
clear_dom()
if(selected == '') {
show_initial_load()
} else {
show_filtered(selected, 0)
}
}
Related
I made an image slider that work, but now I'm trying to add an animation effect to it, and I believe JavaScript may be the answer for that.
I'm trying to add the possibility to click the arrow buttons and have the image slide left or right depending on whether the left or right arrow is being clicked.
Is that possible.
Here is my HTML file.
<body>
<div id="hcg-slider-1" class="hcg-slider">
<div class="hcg-slide-container">
<div class="hcg-slider-body">
<a class="hcg-slides animated" style="display:block">
<span class="hcg-slide-number">1/5</span>
<img src="https://www.html-code-generator.com/images/slider/1.png" alt="image 1">
<span class="hcg-slide-text">image 1</span>
</a>
</div>
<a class="hcg-slide-prev" href="#">❮</a>
<a class="hcg-slide-next" href="#">❯</a>
</div>
<div class="hcg-slide-dot-control"></div>
</div>
<script>
(function(){
//If you want to include more images, add the link name and URL of the image in the array list below.
let images_list = [
{"url":"photos/headers/ABY-header.png",
"link":"",
"name": "just text"},
{"url":"photos/headers/TMN-header.png",
"link":"",
"name": "just text"},
{"url":"photos/headers/TW-header.png",
"link":"",
"name": "just text"},
{"url":"photos/headers/NY-header.png",
"link":"",
"name": "just text"},
];
let slider_id = document.querySelector("#hcg-slider-1");
// append all images
let dots_div = "";
let images_div = "";
for (let i = 0; i < images_list.length; i++) {
// if no link without href="" tag
let href = (images_list[i].link == "" ? "":' href="'+images_list[i].link+'"');
images_div += '<a'+href+' class="hcg-slides animated"'+(i === 0 ? ' style="display:block"':'')+'>'+
'<span class="hcg-slide-number">'+(i+1)+'/'+images_list.length+'</span>'+
'<img src="'+images_list[i].url+'" alt="'+images_list[i].name+'">'+
'<span class="hcg-slide-text">'+images_list[i].name+'</span>'+
'</a>';
dots_div += '<span class="hcg-slide-dot'+(i === 0 ? ' dot-active':'')+'" data-id="'+i+'"></span>';
}
slider_id.querySelector(".hcg-slider-body").innerHTML = images_div;
slider_id.querySelector(".hcg-slide-dot-control").innerHTML = dots_div;
let slide_index = 0;
let images = slider_id.querySelectorAll(".hcg-slides");
let dots = slider_id.querySelectorAll(".hcg-slide-dot");
let prev_button = slider_id.querySelector(".hcg-slide-prev");
let next_button = slider_id.querySelector(".hcg-slide-next");
function showSlides() {
if (slide_index > images.length-1) {
slide_index = 0;
}
if (slide_index < 0) {
slide_index = images.length-1;
}
for (let i = 0; i < images.length; i++) {
images[i].style.display = "none";
dots[i].classList.remove("dot-active");
if (i == slide_index) {
images[i].style.display = "block";
dots[i].classList.add("dot-active");
}
}
}
prev_button.addEventListener("click", function(event) {
event.preventDefault();
slide_index--;
showSlides();
}, false);
next_button.addEventListener("click", function(event){
event.preventDefault();
slide_index++;
showSlides();
}, false);
function dot_click(event) {
slide_index = event.target.dataset.id;
showSlides();
}
for (let i = 0; i < dots.length; i++) {
dots[i].addEventListener("click", dot_click, false);
}
})();
</script>
I managed to add a sliding animation using JavaScript. Here's a good guide as to how it can be done.
https://www.cssscript.com/animated-image-slider/
This is the code I added.
const content = document.querySelector(".content");
const slider = document.querySelector(".slider");
const sliderImage = Array.from(document.querySelectorAll(".slider-image"));
const btnChevron = document.querySelectorAll(".btn-chevron");
let i = 0;
let reset = (container, clase) => {
container.forEach(item => item.classList.remove(clase));
}
let createInfo = text => {
const sliderInfo = document.createElement("p");
sliderInfo.className = "slider-info";
sliderInfo.textContent = text;
content.appendChild(sliderInfo);
};
let createIndicators = () => {
const container = document.createElement("div");
container.className = "indicator";
content.appendChild(container)
sliderImage.forEach(image => {
let indicator = document.createElement("p");
indicator.textContent = sliderImage.indexOf(image) + 1;
container.appendChild(indicator);
})
}
let Image = (index) => {
const indicators = document.querySelectorAll('.indicator p');
const sliderInfo = document.querySelector('.slider-info');
sliderImage[index].classList.add('slider-image-active');
reset(indicators, 'indicator-active');
indicators[i].classList.add('indicator-active');
if (content.hasElement(".slider-info")) return sliderInfo.textContent = sliderImage[index].dataset.info;
createInfo(sliderImage[index].dataset.info);
}
let setPosition = (index) => {
let width = sliderImage[index].getBoundingClientRect().width;
slider.style.transform = `translateX(-${width * index}px)`;
}
let moveImage = () => {
if (i === sliderImage.length) {
i = 0; // Si el contador ya llego al ultimo item, lo manda al primer item.
} else if (i == -1) {
i = sliderImage.length - 1; // Si llego al primero lo manda hasta el ultimo.
}
reset(sliderImage, 'slider-image-active');
setPosition(i);
Image(i);
};
btnChevron.forEach(btn => {
btn.addEventListener('click', () => {
if (btn.dataset.action == "right") {
i++;
return moveImage();
}
i--;
return moveImage();
})
})
createIndicators();
Image(i);
JS code below catches words from an input as hashtags and turn them to HTML span tag. I just need to put limitation at the amount of words and span tags that are generated by user. For example 10 words. Moreover, by pressing space button the user can delete tags.
const BACKSPACE = 8;
const ENTER = 32;
document.getElementById('tag-input').addEventListener('keydown', adjust);
function adjust(e) {
const val = e.target.value;
if (e.keyCode === BACKSPACE && !val) {
deleteTag();
}
if (e.keyCode === ENTER && val) {
e.target.value = '';
addTag(val);
}
const textLength = textLengthToPx(val);
const inputWidth = e.target.offsetWidth;
const minThreshold = 1;
const maxThreshold = 200;
const delta = inputWidth - textLength;
const shouldGrow = delta < minThreshold;
const shouldShrink = delta > maxThreshold;
if (shouldGrow) {
setStyle(e.target, 'width', '90%');
} else if (shouldShrink) {
e.target.style = '';
}
}
function deleteTag() {
document.querySelectorAll('#tags > span')[document.querySelectorAll('#tags > span').length - 1].remove();
}
function addTag(val) {
const input = document.getElementById('tag-input');
const tag = document.createElement('span');
const tagsContainer = document.getElementById('tags');
tag.className = 'tag';
tag.innerHTML = val;
let counter = 0;
while (counter <= 5) {
tagsContainer.insertBefore(tag, input);
counter++;
}
}
function setStyle(node, rule, value) {
node.style = `${rule}:${value}`;
}
function textLengthToPx(text) {
const span = document.createElement('span');
span.innerHTML = text;
span.className = 'invisible';
return span.offsetWidth;
}
<textarea id="tag-input"></textarea>
Solved the problem by adding a counter.
I am trying to replicate a mosaic that can be found on many webpages. While looking for solutions to my problem I came accross a very good implementation on squarespace seen at https://native-demo.squarespace.com/images-native/. I have hosted my website containing the mosaic at http://alexstiles.000webhostapp.com.
My issue is that when you resize the window the horizontal spacing between the images flucuates like it has an animation instead of staying consistient. Although it sorts itself out if you resize slowly, rapid movements can cause the margin to be to large or small. This behavior is not present in the squarespace template. How can I remove this and make the margin consistient when resizing? I have already tried using css margins instead of javascript. I have added the javascript below to help.
let mosaic = document.getElementsByClassName("mosaic")[0]; // For a single mosaic for now
let numImages = 12;
let imageTopic = "design";
let originalImageTopic = "design";
let rowWidth = 3;
let scale = 1;
let mosaicLoader = document.getElementsByClassName("loader-container")[0]
let search = document.getElementById("search");
let searchBtn = document.getElementById("search-button");
let form = document.getElementsByTagName("form")[0];
function rem(rems) {
return rems * (16 * scale);
}
searchBtn.addEventListener("click", function(event) {
event.preventDefault();
searchResult(search.value);
});
search.addEventListener("click", function() {
form.classList.add("focused");
});
search.addEventListener("blur", function() {
form.classList.remove("focused");
});
document.onkeydown = checkKey;
function checkKey(e) {
e = e || window.event;
if (e.keyCode == '13' || e.which == '13' || e.key === "Enter") {
e.preventDefault();
searchResult(search.value);
}
}
if (window.location.hash) {
let hash = window.location.hash.substring(1); //Puts hash in variable, and removes the # character
search.value = hash;
searchResult(hash);
}
function searchResult(query) {
// Get and set query
query = ((query != "" && query != originalImageTopic) ? search.value : imageTopic);
imageTopic = query;
if (imageTopic != originalImageTopic) {
parent.location.hash = imageTopic;
document.getElementById("search-term").textContent = imageTopic + " pictures";
}
// Put up loader while fetching images
mosaicLoader.style.display = "flex";
// Remove old images
let length = mosaic.children.length;
while (mosaic.lastChild && length > 1) {
mosaic.removeChild(mosaic.lastChild);
length--;
}
// Create new images
let loadedImageNum = 0
for (let i = 0; i < numImages; i++) {
let image = document.createElement("img");
image.src = `https://source.unsplash.com/random?${imageTopic}/sig${i}/`;
mosaic.appendChild(image);
}
// Wait for all images to load
let loadedImages = 0;
let image = mosaic.querySelectorAll("img");
imageCheck = setInterval(function() {
for (let i = 0; i < numImages; i++) {
if (image[i].naturalHeight !== 0 && image[i].complete) {
loadedImages++;
}
if (loadedImages == numImages) {
clearInterval(imageCheck);
// alert("Loaded!")
// Lay them out
setTimeout(imagesLoaded, 2000); // Needs some time before laying out
// Break loop
break;
}
}
}, 200)
}
searchResult(imageTopic); // Inital images with no search query
window.onload = function() {
windowResizeEvents();
}
window.onresize = function() {
windowResizeEvents();
}
function windowResizeEvents() {
imagesLoaded();
}
function mosaicCalibration() {
let images = document.querySelectorAll(".mosaic img");
if (window.innerWidth < 750) {
mosaic.classList.add("column");
} else if (window.innerWidth < 1100) {
rowWidth = 2;
} else {
rowWidth = 3 // Math.round(window.innerWidth/(426 + (2/3)));
}
if (window.innerWidth > 750) {
mosaic.classList.remove("column");
for (let i = 0; i < images.length; i++) {
images[i].style.width = `calc((100% - ${((rowWidth - 1) * 1)}rem) / ${rowWidth})`;
}
}
}
function imagesLoaded() {
// Find out row width, image width, etc
mosaicCalibration();
// Remove loader and set height to 0 so new height can be calculated
mosaicLoader.style.display = "none";
mosaic.style.height = 0;
// Define variables
let images = document.querySelectorAll(".mosaic img");
let row = 0;
let rowNum = 0;
let margin = rem(1.25);
let imageWidth = ((mosaic.scrollWidth - (2 * margin)) / rowWidth);
let column = [];
for (let i = 0; i < images.length; i++) {
images[i].style.top = i > rowWidth - 1 ? column[i-rowWidth] + margin : 0;
if (row < rowWidth) {
if (window.innerWidth > 1100) {
images[i].style.left = row * imageWidth + (row >= 1 ? row * margin : 0);
} else {
images[i].style.left = row * imageWidth + (row >= 1 ? (row + 0.5) * margin : 0);
}
row++
} else {
images[i].style.left = 0;
row = 1;
rowNum++;
}
if (rowNum > 0) {
column.push(column[i-rowWidth] + images[i].scrollHeight + margin);
} else {
column.push(images[i].scrollHeight);
}
}
mosaic.style.height = mosaic.scrollHeight;
}
I'm trying to add the numbers of pagination using Javascript. The arrows navigation is working fine but when I try to add the numbers of pages my code doesn't work. I have 2 pages with 10 results each. When I click in the number 1 the console print the number 3. The problem is inside the function createPagination when I create the loop for the page numbers. Any help?
var arrFull = [];
var pageSize = 10;
var pages = -1;
var actualPage = 0;
function changePagination(pagination) {
if(Number(pagination) !== actualPage && pagination > 0 && pagination <= pages) {
var start = ((pagination - 1) * pageSize) + 1;
if(pagination === 1) {
ini = 0;
}
var end = pagination * pageSize;
if(end > arrFull.length) {
end = arrFull.length;
}
var arr = arrFull.slice(start,end);
for(var i = 0; i < arr.length; i++) {
createObject(arr[i]);
}
actualPage = Number(pagination);
createPagination();
}
}
function createPagination() {
var paginator = document.getElementById('pagination');
paginator.innerHTML = "";
var arrowLeft = document.createElement('a');
arrowLeft.setAttribute('href', '');
var arrowRight = document.createElement('a');
arrowRight.setAttribute('href', '');
arrowLeft.innerHTML = '<span class="arrow"></span>';
arrowLeft.addEventListener('click', function(event) {
event.preventDefault();
changePagination(actualPage - 1);
});
arrowRight.innerHTML = '<span class="arrow"></span>';
arrowRight.addEventListener('click', function(event) {
event.preventDefault();
changePagination(actualPage + 1);
});
paginator.appendChild(arrowLeft);
for(var pagination = 1; pagination <= pages; pagination++) {
var number = document.createElement('a');
number.setAttribute('href', '');
number.innerHTML = pagination;
number.addEventListener('click', function(event) {
event.preventDefault();
changePagination(pagination);
console.log(pagination);
});
paginator.appendChild(number);
}
paginator.appendChild(arrowRight);
}
When you pass on your pagination variable it passes the last value set to it in that context (the 3 because of its last iteration in the loop).
You should declare a variable inside the click event and assign to it the value of pagination and then pass your local variable to your method:
number.addEventListener('click', function(event)
{
let currentPage = pagination;
event.preventDefault();
changePagination(currentPage);
console.log(currentPage);
});
That should do the trick.
Edit
This is the actual solution:
number.setAttribute("page", pagination);
number.addEventListener('click', function(event) {
let currentPage = +event.target.getAttribute("page");
event.preventDefault();
changePagination(currentPage);
console.log(currentPage);
});
The reason why the number 3 is being returned is because the let currentPage = pagination; line is being executed when the event triggers; by that time the value of the variable pagination is equal to 3, so you need to save its value through every iteration (it can be saving it inside a property within your element outside of the event scope like so: number._pageNumber = pagination;; or as the given example: number.setAttribute("page", pagination);).
Full implementation
<html>
<body>
<!--Element to simulate the pagination-->
<div id="pagination"></div>
<script>
var arrFull = [];
var pageSize = 10;
var pages = 2; // Change to simulate your case (changed the '-1' to '2')
var actualPage = 0;
function changePagination(pagination) {
if(Number(pagination) !== actualPage && pagination > 0 && pagination <= pages) {
var start = ((pagination - 1) * pageSize) + 1;
if(pagination === 1) {
ini = 0;
}
var end = pagination * pageSize;
if(end > arrFull.length) {
end = arrFull.length;
}
var arr = arrFull.slice(start,end);
for(var i = 0; i < arr.length; i++) {
createObject(arr[i]);
}
actualPage = Number(pagination);
createPagination();
}
}
function createPagination() {
var paginator = document.getElementById('pagination');
paginator.innerHTML = "";
var arrowLeft = document.createElement('a');
arrowLeft.setAttribute('href', '');
var arrowRight = document.createElement('a');
arrowRight.setAttribute('href', '');
arrowLeft.innerHTML = '<span class="arrow"></span>';
arrowLeft.addEventListener('click', function(event) {
event.preventDefault();
changePagination(actualPage - 1);
});
arrowRight.innerHTML = '<span class="arrow"></span>';
arrowRight.addEventListener('click', function(event) {
event.preventDefault();
changePagination(actualPage + 1);
});
paginator.appendChild(arrowLeft);
for(var pagination = 1; pagination <= pages; pagination++) {
var number = document.createElement('a');
number.setAttribute('href', '');
number.innerHTML = pagination;
// <Here_is_the_sugested_code> //
number.setAttribute("page", pagination);
number.addEventListener('click', function(event) {
let currentPage = +event.target.getAttribute("page");
event.preventDefault();
changePagination(currentPage);
console.log(currentPage);
});
// </Here_is_the_sugested_code> //
paginator.appendChild(number);
}
paginator.appendChild(arrowRight);
}
createPagination(); // Call to the function to simulate the generation
</script>
</body>
</html>
I have a very strange problem with some jquery code that scrolls a group of images. It seems to work in all browsers for the first several clicks, advancing the images by a number. And in Safari, it will work perfectly all the way to the end of the slideshow. But in FF and Chrome it will stop after a certain number of images. And this number is NOT always the same for some reason.
For example, on this page FF/Chrome will stop after clicking the next arrow 7 times.
And on this page, FF/Chrome will stop after clicking the next arrow 6 times.
Yet on this page, FF/Chrome will work all the way to the end as expected (and as Safari does all the time).
This is the code that controls the clicking:
<script>$(window).load(function(){
var currentElement = $("#ngg-gallery-list > div:nth-child(2)");
var onScroll = function () {
//get the current element
var container = $("#ngg-galleryoverview");
var wrapper = $("#ngg-gallery-list");
var children = wrapper.children();
var position = 0;
for (var i = 0; i < children.length; i++) {
var child = $(children[i]);
var childLeft = container.offset().left < child.offset().left;
if (childLeft) {
currentElement = child;
return;
}
}
}
var scrollToElement = function ($element) {
var container = $("#ngg-galleryoverview");
var wrapper = $("#ngg-gallery-list");
var children = wrapper.children();
var width = 0;
console.log(children.length);
for (var i = 0; i < children.length; i++) {
var child = $(children[i]);
if (child.get(0) == $element.get(0)) {
if (i == 0) {
width = 300;
}
container.animate({
scrollLeft: width
}, 300);
onScroll();
}
if (child.next().length > 0) {
//make sure we factor in borders/padding/margin in height
width += child.next().offset().left - child.offset().left
} else {
width += child.width();
}
}
}
var next = function(event) {
event.preventDefault();
scrollToElement(currentElement);
}
var prev = function(event) {
event.preventDefault();
var container = $("#ngg-galleryoverview");
if (currentElement.prev().length > 0) {
if (container.offset().left == currentElement.prev().offset().left) {
currentElement = currentElement.prev().prev().length > 0 ? currentElement.prev().prev() : currentElement.prev();
} else {
currentElement = currentElement.prev();
}
}
scrollToElement(currentElement);
}
$("#ngg-galleryoverview").on('scroll', onScroll);
$("#nexty").click(next);
$("#prevy").click(prev);
});
</script>
I'm stumped.
Well, making my code look more like what I found here fixed the problem. (Even if I am not entirely sure why). Hoping it helps someone else, here is the final code:
<script>
$(document).ready(function () {
var currentElement = $("#ngg-galleryoverview > div:nth-child(1)");
var onScroll = function () {
var container = $("#ngg-galleryoverview");
var children = $(".list");
for (var i = 0; i < children.length; i++) {
var child = $(children[i]);
var childLeft = container.offset().left < child.offset().left;
if (childLeft) {
currentElement = child;
//console.log(currentElement);
return;
}
}
};
var scrollToElement = function ($element) {
var container = $("#ngg-galleryoverview");
var children = $(".list");
var width = 0;
for (var i = 0; i < children.length; i++) {
var child = $(children[i]);
if (child.get(0) == $element.get(0)) {
if (i === 0) {
width = 0;
}
container.animate({
scrollLeft: width
}, 500);
onScroll();
}
if (child.next().length > 0) {
width += child.next().offset().left - child.offset().left;
} else {
width += child.width();
}
}
};
var buttonright = function (e) {
scrollToElement(currentElement.next());
};
var buttonleft = function (e) {
var container = $("#ngg-galleryoverview");
if (currentElement.prev().length > 0) {
if (container.offset().left == currentElement.prev().offset().left) {
currentElement = currentElement.prev().prev().length > 0 ? currentElement.prev().prev() : currentElement.prev();
} else {
currentElement = currentElement.prev();
}
}
scrollToElement(currentElement);
};
onScroll();
$("#ngg-galleryoverview").scroll(onScroll);
$("#nexty").click(buttonright);
$("#prevy").click(buttonleft);
});</script>