I have a gallery in my website (on my computer, not on a server yet) and I have a problem on it. here is it's script(it's loaded from the server by php):
$(document).ready(function() {
$('.gallery').hide();
$('.gallery:first').fadeIn();
var galleryItems=$('.gallery').length;
var index=0;
setInterval(function()
{
index++ ;
var id="gallery-"+(index);
$('.gallery').hide();
if (index==galleryItems)
{
index=0;
}
$('#gallery-'+index).fadeIn(1000);
},7000);
});
The gallery works, but after some time that I'm not looking on the gallery it stop working correctly.
This is how it supposed to look:
picture 1
This is how it actually looks:
picture 2
What should I do?
I believe that when the index==galleryItems you are fading in item 0 instead of the last item. Then when the gallery continues it fades in the next item, resulting in doubling.
$(document).ready(function() {
$('.gallery').hide();
$('.gallery:first').fadeIn();
var galleryItems=$('.gallery').length;
var index=0;
setInterval(function()
{
index++ ;
//var id="gallery-"+(index); this is unused so it should be removed.
$('.gallery').hide();
$('#gallery-'+index).fadeIn(1000); // MOVED TO BEFORE INDEX RESET
if (index==galleryItems)
{
index=0;
}
},7000);
});
Related
Hi I am writing a chat website and I have a problem with the div containing the messages. In the CSS the div containing the messages has overflow: auto; to allow scroll bars. Now the problem is when ajax is fetching the messages through a PHP script that fetches the messages from the database, you cannot scroll up. The AJAX refreshMessages() function is set to update every second using window.setInterval(refreshMessages(), 1000);. This is what I want but when I scroll up to see previous messages, the scroll bar hits straight back down to the end of the chat due to the AJAX fetch function.
Any ideas of what the issue is?
AJAX Code:
//Fetch All Messages
var refreshMessages = function() {
$.ajax({
url: 'includes/messages.inc.php',
type: 'GET',
dataType: 'html'
})
.done(function( data ) {
$('#messages').html( data );
$('#messages').stop().animate({
scrollTop: $("#messages")[0].scrollHeight
}, 800);
})
.fail(function() {
$('#messages').prepend('Error retrieving new messages..');
});
}
EDIT:
I'm using this code but it isn't quite working, it pauses the function but then the function doesn't restart when the scroll bar goes back to the bottom. Help?
//Check If Last Message Is In Focus
var restarted = 0;
var checkFocus = function() {
var container = $('.messages');
var height = container.height();
var scrollHeight = container[0].scrollHeight;
var st = container.scrollTop();
var sum = scrollHeight - height - 32;
if(st >= sum) {
console.log('focused'); //Testing Purposes
if(restarted = 0) {
window.setTimeout(refreshMessages(), 2000);
restarted = 1;
}
} else {
window.clearInterval(refreshMessages());
restarted = 0;
}
}
You need to replace the checkFocus() function to return true or false and then get AJAX to check if it need's to send the scroll bar down after adding in the new message or not. Replace the checkFocus() function with this:
//Check If Last Message Is In Focus
var checkFocus = function() {
var container = $('.messages');
var height = container.height();
var scrollHeight = container[0].scrollHeight;
var st = container.scrollTop();
var sum = scrollHeight - height - 32;
if(st >= sum) {
return true;
} else {
return false;
}
}
Change AJAX .done to this:
.done(function( data ) {
if(checkFocus()) {
$('#messages').html( data );
scrollDownChat();
} else {
$('#messages').html( data );
}
})
To answer your question of what's happening: the interval runs every second, and when you have scrolled up during that waiting period, it'll run again and move you down 800 pixels. You can remove this from your function to do this.
Since you're using overflow: auto, your chat box will grow and create a scrollbar when necessary. Have you tried removing the scroll functionality? Does it not move to the latest text at the bottom?
If not, then you can check if user has scrolled or not, when user has scrolled, you should not scroll using jQuery. To do this, you can add a variable outside this function which gets updated if user scrolls at all.
Detecting between user scrolling and your javascript scrolling is not easy, so you can use which message(s) is(are) being viewed. If the message in focus is the last message, you should keep scrolling to the bottom, but when the last message goes out of view, you can assume user has scrolled.
See this question for more info on detecting scroll: Detect whether scroll event was created by user
on http://zentili.koding.com i've got this javascript that loads the content of the linked menu item inside the main #content div of the index page, and applies an hash with the name of the loaded page minus the '.php', otherwise it loads the hash + '.php' if it's entered in the url. works very good. On other hand, the ENG/ITA entries add ?locale=lang_LANG inside the url, right before the hash, so that localization is also working fine. If you look well, you may notice that when you switch between ENG and ITA, the index-content appears just for one moment before going to the hash. I know this is because the page is first loaded, then taken to the hash but i was wondering if there some way for hiding the homepage and going directly to the hash location when it's loaded.
Here the code for my menu:
<script type="text/javascript">
$(document).ready(function() {
var hash = window.location.hash.substr(1);
var href = $('#menubar a.item').each(function(){
var href = $(this).attr('href');
if(hash==href.substr(0,href.length-4)){
var toLoad = hash+'.php';
$('#content').load(toLoad);
$("#menubar a.item").removeClass("current");
$(this).addClass("current");
}
});
$('#menubar a.item').click(function(){
window.location.hash = $(this).attr('href').substr(0,$(this).attr('href').length-4);
var toLoad = $(this).attr('href');
$('#content').fadeOut('fast',loadContent);
function loadContent() {
$('#content').load(toLoad,'',showNewContent) }
function showNewContent() {
$('#content').fadeIn('fast'); }
$("#menubar a.item").removeClass("current");
$(this).addClass("current");
return false;
});
});
function goENG(){
var hash = window.location.hash;
var eng = '?locale=en_EN';
window.location.replace(eng+hash) ;
};
function goITA(){
var hash = window.location.hash;
var ita = '?locale=it_IT';
window.location.replace(ita+hash) ;
};
</script>
the functions goENG() and goITA() are called via onclick on the ENG and ITA a's. I hope to find some solution into this.
The page cannot directly go to the link. It will load in its natural order and then it will go to the hash. For what you want to achieve, there is a simple solution i believe.
Hide the main content div until the document loads. use css rule "visibility:hidden" for this
If there is any hash, load it and then make the content visible.
If there is no hash in url, make the content visible on dom load.
$(document).ready(function() {
var hash = window.location.hash.substr(1);
if ($('#menubar a.item').length > 0) {
var href = $('#menubar a.item').each(function(){
var href = $(this).attr('href');
if(hash==href.substr(0,href.length-4)){
var toLoad = hash+'.php';
$('#content').load(toLoad, function(){
$('#content').attr('visibility', 'visible');
});
$("#menubar a.item").removeClass("current");
$(this).addClass("current");
} else {
$('#content').attr('visibility', 'visible');
}
});
} else {
$('#content').attr('visibility', 'visible');
}
});
--UPDATE--
If you are setting #content as "visibility:hidden"
$('#content').attr('visibility', 'visible');
should always fire, else your #content div will be invisible. The trick here is to set it to visible after we are done with checking for hash. You can keep loading the content in the div and make it visible. Making the #content div visible need not be done after entirely loading the hash.
I am using a div refresh script (Given below). The contents of the div contains an auto scroll ul (code from http://www.dynamicdrive.com/). The refresh is working properly. But after the refresh the auto scrolling is not working
Code for refresh
<script type="text/javascript">
window.onload = setupRefresh;
function setupRefresh()
{
setInterval("refreshBlock();",1000);
}
function refreshBlock()
{
$('#list4').load("refreshpage");
}
</script>
Code for auto scroll
<script type="text/javascript">
var delayb4scroll=2000 //Specify initial delay before marquee starts to scroll on page (2000=2 seconds)
var marqueespeed=1 //Specify marquee scroll speed (larger is faster 1-10)
var pauseit=1 //Pause marquee onMousever (0=no. 1=yes)?
var copyspeed=marqueespeed
var pausespeed=(pauseit==0)? copyspeed: 0
var actualheight=''
function scrollmarquee(){
if (parseInt(cross_marquee.style.top)>(actualheight*(-1)+8))
cross_marquee.style.top=parseInt(cross_marquee.style.top)-copyspeed+"px"
else
cross_marquee.style.top=parseInt(marqueeheight)+8+"px"
}
function initializemarquee(){
cross_marquee=document.getElementById("vmarquee")
cross_marquee.style.top=0
marqueeheight=document.getElementById("list4").offsetHeight
actualheight=cross_marquee.offsetHeight
if (window.opera || navigator.userAgent.indexOf("Netscape/7")!=-1){ //if Opera or Netscape 7x, add scrollbars to scroll and exit
cross_marquee.style.height=marqueeheight+"px"
cross_marquee.style.overflow="scroll"
return
}
setTimeout('lefttime=setInterval("scrollmarquee()",30)', delayb4scroll)
}
if (window.addEventListener)
window.addEventListener("load", initializemarquee, false)
else if (window.attachEvent)
window.attachEvent("onload", initializemarquee)
else if (document.getElementById)
window.onload=initializemarquee
</script>
Could some one please help?
It seems like you need to call initializemarquee() after the load is complete. You can do this in the .load()'s callback.
function refreshBlock(){
$('#list4').load("refreshpage", function(){
clearInterval(lefttime);
initializemarquee()
});
}
I almost forgot to add that you'd also want to stop that interval.
You just need:
function refreshBlock()
{
$('#list4').load("refreshpage");
initializemarquee();
}
Why the mix of plain JS and jQuery? If you have jQuery use it
Here is my rewrite. Not tested but apart from typos or things that I thought could be done in jQuery and cannot, it should do the whole thing
$(function() {
var sId = setInterval(function {
$('#list4').load("refreshpage");
},1000);
var $cross_marquee=$("#vmarquee")
var delayb4scroll=2000 //Specify initial delay before marquee starts to scroll on page (2000=2 seconds)
var marqueespeed=1 //Specify marquee scroll speed (larger is faster 1-10)
var pauseit=true //Pause marquee onMousever (false=no. true=yes)?
var copyspeed=marqueespeed;
var pausespeed=(pauseit==0)? copyspeed: 0;
var actualheight=$cross_marquee.height();
var marqueeheight=$("#list4").height();
$cross_marquee.top(0);
if (window.opera || navigator.userAgent.indexOf("Netscape/7")!=-1){ //if Opera or Netscape 7x, add scrollbars to scroll and exit
$cross_marquee.height(marqueeheight);
$cross_marquee.css("overflow","scroll");
}
else var tId = setTimeout(function() {
lefttime=setInterval(
function() {
var top = $cross_marquee.top();
if (top>(actualheight*(-1)+8)) $cross_marquee.top(top-copyspeed)
else $cross_marquee.top(marqueeheight+8);
}
},30)
, delayb4scroll);
});
I am submitting some data to my database then reloading the same page as the user was just on, I was wondering if there is a way to remember the scroll position the user was just on?
I realized that I had missed the important part of submitting, so, I decided to tweak the code to store the cookie on click event instead of the original way of storing it while scrolling.
Here's a jquery way of doing it:
jsfiddle ( Just add /show at the end of the url if you want to view it outside the frames )
Very importantly, you'll need the jquery cookie plugin.
jQuery:
// When document is ready...
$(document).ready(function() {
// If cookie is set, scroll to the position saved in the cookie.
if ( $.cookie("scroll") !== null ) {
$(document).scrollTop( $.cookie("scroll") );
}
// When a button is clicked...
$('#submit').on("click", function() {
// Set a cookie that holds the scroll position.
$.cookie("scroll", $(document).scrollTop() );
});
});
Here's still the code from the original answer:
jsfiddle
jQuery:
// When document is ready...
$(document).ready(function() {
// If cookie is set, scroll to the position saved in the cookie.
if ( $.cookie("scroll") !== null ) {
$(document).scrollTop( $.cookie("scroll") );
}
// When scrolling happens....
$(window).on("scroll", function() {
// Set a cookie that holds the scroll position.
$.cookie("scroll", $(document).scrollTop() );
});
});
#Cody's answer reminded me of something important.
I only made it to check and scroll to the position vertically.
(1) Solution 1:
First, get the scroll position by JavaScript when clicking the submit button.
Second, include this scroll position value in the data submitted to PHP page.
Third, PHP code should write back this value into generated HTML as a JS variable:
<script>
var Scroll_Pos = <?php echo $Scroll_Pos; ?>;
</script>
Fourth, use JS to scroll to position specified by the JS variable 'Scroll_Pos'
(2) Solution 2:
Save the position in cookie, then use JS to scroll to the saved position when page reloaded.
Store the position in an hidden field.
<form id="myform">
<!--Bunch of inputs-->
</form>
than with jQuery store the scrollTop and scrollLeft
$("form#myform").submit(function(){
$(this).append("<input type='hidden' name='scrollTop' value='"+$(document).scrollTop()+"'>");
$(this).append("<input type='hidden' name='scrollLeft' value='"+$(document).scrollLeft()+"'>");
});
Than on next reload do a redirect or print them with PHP
$(document).ready(function(){
<?php
if(isset($_REQUEST["scrollTop"]) && isset($_REQUEST["scrollLeft"]))
echo "window.scrollTo(".$_REQUEST["scrollLeft"].",".$_REQUEST["scrollTop"].")";
?>
});
Well, if you use _targets in your code you can save that.
Or, you can do an ajax request to get the window.height.
document.body.offsetHeight;
Then drop them back, give the variable to javascript and move the page for them.
To Remember Scroll all pages Use this code
$(document).ready(function (e) {
let UrlsObj = localStorage.getItem('rememberScroll');
let ParseUrlsObj = JSON.parse(UrlsObj);
let windowUrl = window.location.href;
if (ParseUrlsObj == null) {
return false;
}
ParseUrlsObj.forEach(function (el) {
if (el.url === windowUrl) {
let getPos = el.scroll;
$(window).scrollTop(getPos);
}
});
});
function RememberScrollPage(scrollPos) {
let UrlsObj = localStorage.getItem('rememberScroll');
let urlsArr = JSON.parse(UrlsObj);
if (urlsArr == null) {
urlsArr = [];
}
if (urlsArr.length == 0) {
urlsArr = [];
}
let urlWindow = window.location.href;
let urlScroll = scrollPos;
let urlObj = {url: urlWindow, scroll: scrollPos};
let matchedUrl = false;
let matchedIndex = 0;
if (urlsArr.length != 0) {
urlsArr.forEach(function (el, index) {
if (el.url === urlWindow) {
matchedUrl = true;
matchedIndex = index;
}
});
if (matchedUrl === true) {
urlsArr[matchedIndex].scroll = urlScroll;
} else {
urlsArr.push(urlObj);
}
} else {
urlsArr.push(urlObj);
}
localStorage.setItem('rememberScroll', JSON.stringify(urlsArr));
}
$(window).scroll(function (event) {
let topScroll = $(window).scrollTop();
console.log('Scrolling', topScroll);
RememberScrollPage(topScroll);
});
I had major problems with cookie javascript libraries, most cookie libraries could not load fast enough before i needed to scroll in the onload event. so I went for the modern html5 browser way of handling this. it stores the last scroll position in the client web browser itself, and then on reload of the page reads the setting from the browser back to the last scroll position.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
if (localStorage.getItem("my_app_name_here-quote-scroll") != null) {
$(window).scrollTop(localStorage.getItem("my_app_name_here-quote-scroll"));
}
$(window).on("scroll", function() {
localStorage.setItem("my_app_name_here-quote-scroll", $(window).scrollTop());
});
});
</script>
I tackle this via using window.pageYOffset . I saved value using event listener or you can directly call window.pageYOffset. In my case I required listener so it is something like this:
window.addEventListener('scroll', function() {
document.getElementById('showScroll').innerHTML = window.pageYOffset + 'px';
})
And I save latest scroll position in localstorage. So when next time user comes I just check if any scroll value available via localstorage if yes then scroll via window.scrollTo(0,myScrollPos)
sessionStorage.setItem("VScroll", $(document).scrollTop());
var scroll_y = sessionStorage.getItem("VScroll");
setTimeout(function() {
$(document).scrollTop(scroll_y);
}, 300);
I have a pinterest style site and made a jquery script that spaces the cubes evenly no matter how big the browser is. For some reason on page load it has some overlapping cubes which didn't exist before. I talked with the guy that helped me make it and he said it's probly because of the code before the code that creates the blocks and positions them. It crashes the javascript.
I think it's because of the $(window).scroll ajax loading code but I can't seem to pinpoint the problem. I tried moving positionBlocks(); around and nothing changes. If you load the page in your browser and then change your browser size then it positions them correctly but obviously I want it to look right when the user first gets there.
function setupBlocks() {
windowWidth = $(window).width();
blocks = [];
// Calculate the margin so the blocks are evenly spaced within the window
colCount = Math.floor(windowWidth/(colWidth+margin*2));
spaceLeft = (windowWidth - ((colWidth*colCount)+margin*2)) / 2;
spaceLeft -= margin;
for(var i=0;i<colCount;i++){
blocks.push(margin);
}
positionBlocks();
}
function positionBlocks() {
$('.block').each(function(i){
var min = Array.min(blocks);
var index = $.inArray(min, blocks);
var leftPos = margin+(index*(colWidth+margin));
$(this).css({
'left':(leftPos+spaceLeft)+'px',
'top':min+'px'
});
blocks[index] = min+$(this).outerHeight()+margin;
});
}
// Function to get the Min value in Array
Array.min = function(array) {
return Math.min.apply(Math, array);
};
var curlimit=<?php echo $curlimit; ?>;
var totalnum=<?php echo $num_rws; ?>;
var perpage=<?Php echo $perpage ?>;
var working_already=false;
$(document).ready(function() {
//($(window).scrollTop() + $(window).height() )> $(document).height()*0.8
// old ($(window).scrollTop() + $(window).height() == $(document).height())
$(window).resize(setupBlocks);
$(window).scroll(function() {
if(($(window).scrollTop() + $(window).height() )> $(document).height()*0.90 && totalnum>0 && working_already==false ) {
} else return false;
working_already=true;
$("div#loading_bar").fadeIn("slow");
curlimit=curlimit+perpage;
$("div#loading_data_location").html("");
$.get('get_cubes.php?page=<?php echo $_GET['page'] ?>&curlimit='+curlimit, function(response) {
$("div#loading_data_location").html(response);
$("div#ColumnContainer").append($("div#loading_data_location").html());
$("a#bigpic").fancybox({
'onComplete' : imageLoadComplete,
'onClosed' : imageClosed,
'type': 'ajax' });
if ($("div#loading_data_location").text()=="")
totalnum=0;
else
totalnum=<?php echo $num_rws; ?>;
$('.like:not(.liked)').click(like_box);
$('.save:not(.saved)').click(save_box);
$('.follow:not(.following)').click(follow);
$("div#loading_bar").fadeOut("fast");
$("div#loading_data_location").html('');
setupBlocks();
working_already=false;
});
});
I had to add this to the end of my script:
<script language="javascript">
$(window).bind("load", function() {
setupBlocks();
});
</script>
and then this to the end of the on scroll ajax load. Sometimes jquery just needs a little kick in the face haha:
setTimeout(function(){setupBlocks();},100);