I want to drop a div down to a certain height to display some additional content. For that I wrote following dropbox() function:
<script type="text/javascript">
function sleep(milliseconds) {
var start = new Date().getTime();
for (var i = 0; i < 1e7; i++) {
if ((new Date().getTime() - start) > milliseconds){
break;
}
}
}
function dropbox(element){
var obj = document.getElementById(element);
if(obj) {
var element = document.getElementById(element),
style = window.getComputedStyle(element),
height = style.getPropertyValue('height');
height = height.substring(0,2);
var i = 0;
for (i = height; i<200; i++)
{
sleep(100);
var tst = i+"px";
//alert(tst);
obj.style.height = tst;
}
//alert(i);
} else {
}
}
</script>
Now the problem I'm experiencing is, the box actually isn't visible during the roll down process but only after the loop has completed but I want it to look like the "Check Availability"-box on http://www.thedana.com/. How do I get this accomplished?
Thank you!
Here is a sample code. It may help you
<div class="right_content">
We deliver quick and easy registration.
Mysites.com is our hosting server and we've buit our website under observation of Mysite.com
</div>
<p class="flip">Know About us</p>
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js">
</script>
<script type="text/javascript">
$(document).ready(function(){
$(".flip").mouseover(function(){
$(".right_content").slideToggle("slow");
});
});
</script>
You cannot use looping delays in browser javascript as it will make the browser unresponsive to both input and screen updating and waste the battery on a mobile device.
Instead, you should use setTimeout() which lets you schedule an activity for some time in the future. Good animation uses a tweening algorithm that schedules the next tick of the animation, then compares the elapsed time and calculates where the next animation step should be drawn and is continually self correcting in this way.
Also, if you do a Google search for javascript animation, you will find many helpful pieces of prewritten code for doing animation with plain javascript. In addition, all the major javascript libraries (such as jQuery or YUI) have significant animation capabilities built in and already written for you.
Here's a simple example:
function dropbox(elem, finalHt, duration) {
var start = new Date().getTime();
var tick = 20;
var startHt = parseInt(elem.style.height, 10);
var growHt = finalHt - startHt;
function next() {
var now = new Date().getTime();
var percent = (now - start) / duration;
var target = Math.round(startHt + (growHt * percent));
elem.style.height = Math.min(target, finalHt) + "px";
if (target < finalHt) {
setTimeout(next, tick);
}
}
setTimeout(next, tick);
}
function run() {
var item = document.getElementById("box");
item.style.height = "10px";
dropbox(item, 300, 2000);
}
Working example and more generalized code: http://jsfiddle.net/jfriend00/QxXMK/
Related
So here is the thing, I have a sidebar that has big height due the lots of navigation links. And I'm using jQuery nicescroll plugin to make it look fine. In the sidebar I also have h3 tag which makes a random effect of showing letters (see the code) every 4 seconds. So, when it's on - scroll is not working at all for these 4 seconds and you can't do any scrolling. I tried to use $("#sidebar").getNiceScroll().resize() but it doesn't work either. Is there any way to make it work?
<div id="sidebar">
<h3 id="output">Random</h3>
</div>
//Calling for nicescroll function for my sidebar
$(function(){
$("#sidebar").niceScroll({ cursorcolor:"#66aee9", cursorfixedheight: 400 });
})
//Random effect for my h3 tag
setInterval(function(){
$(document).ready(function(){
var theLetters = "abcdefghijklmnopqrstuvwxyz#%&^+=-"; //You can customize what letters it will cycle through
var ctnt = "Random"; // Your text goes here
var speed = 50; // ms per frame
var increment = 8; // frames per step. Must be >2
var clen = ctnt.length;
var si = 0;
var stri = 0;
var block = "";
var fixed = "";
//Call self x times, whole function wrapped in setTimeout
(function rustle (i) {
setTimeout(function () {
if (--i){rustle(i);}
nextFrame(i);
si = si + 1;
}, speed);
})(clen*increment+1);
function nextFrame(pos){
for (var i=0; i<clen-stri; i++) {
//Random number
var num = Math.floor(theLetters.length * Math.random());
//Get random letter
var letter = theLetters.charAt(num);
block = block + letter;
}
if (si == (increment-1)){
stri++;
}
if (si == increment){
// Add a letter;
// every speed*10 ms
fixed = fixed + ctnt.charAt(stri - 1);
si = 0;
}
$("#output").html(fixed + block);
block = "";
}
});
}, 4000);
I change to rows and check it in jsfiddle, looks like working scroll fine.
Before:
setInterval(function(){
$(document).ready(function(){
...
});
}, 4000);
After:
$(document).ready(function(){
setInterval(function(){
...
}, 4000);
});
I have a client who is (for reasons of her own...!) desperate to have 1990s-style falling sparkles coming from the top of her webpage. There seem to exist a ton of snowfall scripts to facilitate this, but the problem is she only wants the animation to persist while the mouse is moving - when the mouse stops, she wants the sparkles to stop falling.
Peter Gehrig's Snowmaker gives the closest visual effect to what I'm looking for, but I just can't figure out how to stop it animating when the mouse stops moving. My Javascript is really terrible (I'm working on it with the help of Codecademy, but it's taking time) and I generally get by by patching together bits and pieces of existing code, but I can't figure this one out.
Gehrig's code is as follows, and I'm not sure if it's possible to make it only fire while the mouse is moving...
<script>
// Set the number of snowflakes (more than 30 - 40 not recommended)
var snowmax=35
// Set the colors for the snow. Add as many colors as you like
var snowcolor=new Array("#aaaacc","#ddddFF","#ccccDD")
// Set the fonts, that create the snowflakes. Add as many fonts as you like
var snowtype=new Array("Arial Black","Arial Narrow","Times","Comic Sans MS")
// Set the letter that creates your snowflake
var snowletter="+"
// Set the speed of sinking (recommended values range from 0.3 to 2)
var sinkspeed=0.6
// Set the maximal-size of your snowflaxes
var snowmaxsize=22
// Set the minimal-size of your snowflaxes
var snowminsize=8
// Set the snowing-zone
// Set 1 for all-over-snowing, set 2 for left-side-snowing
// Set 3 for center-snowing, set 4 for right-side-snowing
var snowingzone=1
var snow=new Array()
var marginbottom
var marginright
var timer
var i_snow=0
var x_mv=new Array();
var crds=new Array();
var lftrght=new Array();
var browserinfos=navigator.userAgent
var ie5=document.all&&document.getElementById&&!browserinfos.match(/Opera/)
var ns6=document.getElementById&&!document.all
var opera=browserinfos.match(/Opera/)
var browserok=ie5||ns6||opera
function randommaker(range) {
rand=Math.floor(range*Math.random())
return rand
}
function initsnow() {
if (ie5 || opera) {
marginbottom = document.body.clientHeight
marginright = document.body.clientWidth
}
else if (ns6) {
marginbottom = window.innerHeight
marginright = window.innerWidth
}
var snowsizerange=snowmaxsize-snowminsize
for (i=0;i<=snowmax;i++) {
crds[i] = 0;
lftrght[i] = Math.random()*15;
x_mv[i] = 0.03 + Math.random()/10;
snow[i]=document.getElementById("s"+i)
snow[i].style.fontFamily=snowtype[randommaker(snowtype.length)]
snow[i].size=randommaker(snowsizerange)+snowminsize
snow[i].style.fontSize=snow[i].size
snow[i].style.color=snowcolor[randommaker(snowcolor.length)]
snow[i].sink=sinkspeed*snow[i].size/5
if (snowingzone==1) {snow[i].posx=randommaker(marginright-snow[i].size)}
if (snowingzone==2) {snow[i].posx=randommaker(marginright/2-snow[i].size)}
if (snowingzone==3) {snow[i].posx=randommaker(marginright/2-
snow[i].size)+marginright/4}
if (snowingzone==4) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}
snow[i].posy=randommaker(6*marginbottom-marginbottom-6*snow[i].size)
snow[i].style.left=snow[i].posx
snow[i].style.top=snow[i].posy
}
movesnow()
}
function movesnow() {
for (i=0;i<=snowmax;i++) {
crds[i] += x_mv[i];
snow[i].posy+=snow[i].sink
snow[i].style.left=snow[i].posx+lftrght[i]*Math.sin(crds[i]);
snow[i].style.top=snow[i].posy
if (snow[i].posy>=marginbottom-6*snow[i].size || parseInt(snow[i].style.left)>(marginright-3*lftrght[i])){
if (snowingzone==1) {snow[i].posx=randommaker(marginright-snow[i].size)}
if (snowingzone==2) {snow[i].posx=randommaker(marginright/2-snow[i].size)}
if (snowingzone==3) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}
if (snowingzone==4) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}
snow[i].posy=0
}
}
var timer=setTimeout("movesnow()",50)
}
for (i=0;i<=snowmax;i++) {
document.write("<span id='s"+i+"' style='position:absolute;top:-"+snowmaxsize+"'>"+snowletter+"</span>")
}
if (browserok) {
window.onload=initsnow
}
</script>
Let me know if this works. Keep in mind there is a limit on the number of flakes so it won't always generate new flakes unless enough have landed already.
<script>
var snowmax=35 // Set the number of snowflakes (more than 30 - 40 not recommended)
var snowcolor=new Array("#aaaacc","#ddddFF","#ccccDD") // Set the colors for the snow. Add as many colors as you like
// Set the fonts, that create the snowflakes. Add as many fonts as you like
var snowtype=new Array("Arial Black","Arial Narrow","Times","Comic Sans MS")
var snowletter="+" // Set the letter that creates your snowflake
var sinkspeed=0.6 // Set the speed of sinking (recommended values range from 0.3 to 2)
var snowmaxsize=22 // Set the maximal-size of your snowflaxes
var snowminsize=8 // Set the minimal-size of your snowflaxes
// Set the snowing-zone
// Set 1 for all-over-snowing, set 2 for left-side-snowing
// Set 3 for center-snowing, set 4 for right-side-snowing
var snowingzone=1
var snow=new Array()
var marginbottom
var marginright
var timer
var i_snow=0
var x_mv=new Array();
var crds=new Array();
var lftrght=new Array();
var browserinfos=navigator.userAgent
var ie5=document.all&&document.getElementById&&!browserinfos.match(/Opera/)
var ns6=document.getElementById&&!document.all
var opera=browserinfos.match(/Opera/)
var browserok=ie5||ns6||opera
var mousemoving = false;
function randommaker(range) {
rand=Math.floor(range*Math.random())
return rand
}
function initsnow() {
if (ie5 || opera) {
marginbottom = document.body.clientHeight
marginright = document.body.clientWidth
} else if (ns6) {
marginbottom = window.innerHeight
marginright = window.innerWidth
}
makeSnow();
movesnow();
}
function makeSnow() {
var snowsizerange=snowmaxsize-snowminsize
for (i=0;i<=snowmax;i++) {
crds[i] = 0;
lftrght[i] = Math.random()*15;
x_mv[i] = 0.03 + Math.random()/10;
snow[i] = document.getElementById("s"+i)
snow[i].style.fontFamily=snowtype[randommaker(snowtype.length)]
snow[i].size=randommaker(snowsizerange)+snowminsize
snow[i].style.fontSize=snow[i].size
snow[i].style.color=snowcolor[randommaker(snowcolor.length)]
snow[i].sink=sinkspeed*snow[i].size/5
if (snowingzone==1) {snow[i].posx=randommaker(marginright-snow[i].size)}
if (snowingzone==2) {snow[i].posx=randommaker(marginright/2-snow[i].size)}
if (snowingzone==3) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}
if (snowingzone==4) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}
snow[i].posy=randommaker(6*marginbottom-marginbottom-6*snow[i].size)
snow[i].style.left=snow[i].posx
snow[i].style.top=snow[i].posy
}
}
function movesnow() {
for (i=0;i<=snowmax;i++) {
if (snow[i].posy<marginbottom-6*snow[i].size || parseInt(snow[i].style.left)<(marginright-3*lftrght[i])){
crds[i] += x_mv[i];
snow[i].posy+=snow[i].sink
snow[i].style.left=snow[i].posx+lftrght[i]*Math.sin(crds[i]);
snow[i].style.top=snow[i].posy
}
if (mousemoving) {
if (snow[i].posy>=marginbottom-6*snow[i].size || parseInt(snow[i].style.left)>(marginright-3*lftrght[i])){
if (snowingzone==1) {snow[i].posx=randommaker(marginright-snow[i].size)}
if (snowingzone==2) {snow[i].posx=randommaker(marginright/2-snow[i].size)}
if (snowingzone==3) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}
if (snowingzone==4) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}
snow[i].posy=0
}
}
}
var timer=setTimeout("movesnow()",50)
}
for (i=0;i<=snowmax;i++) {
document.write("<span id='s"+i+"' style='position:absolute;top:-"+snowmaxsize+"'>"+snowletter+"</span>")
}
if (browserok) {
window.onload=initsnow
window.onmousemove = function() {
mousemoving = true;
setTimeout(function() {
mousemoving = false;
}, 500);
}
}
</script>
Something like this: listen for a mousemove event, and set a timeout for 500ms to stop the snow. When the mouse moves again, clear the timeout from last time, and set a new one. JS Code:
var interval;
window.onmousemove=function(){
clearInterval(interval);
startSnow();
interval=setTimeout(stopSnow,500);
}
Where startSnow() and stopSnow() are functions provided by you.
Edit: here's some code for the startSnow() and stopSnow() functions:
var snowGoing=true;
function startSnow(){
if(snowGoing===false){
snowGoing=true;
movesnow();
}
}
function stopSnow(){
if(snowGoing===true){
snowGoing=false;
clearTimeout(timer);
}
}
My slideshow is suffering from erratic behaviour. it's driven by pagers which the user clicks. when the corresponding pager is clicked, the next image is made visible (opacity/filter) and set as z-index 5 so that it should sit beneath the present image (z-index 10). The current image is then faded-out and finally, the next image is set to current and the image that has faded out is set to z-index 0. However, this only works when clicking back to a previous image (in Chrome, ie is behaving even more strangely.) in the order of images. That is to say,
chrome:
"list_slide1" to "list_slide3" instant jump with no fade
"list_slide3" to "list_slide1" fade behaves correctly
then...
"list_slide1" to "list_slide3" instant jump no fade "list_slide3" to
"list_slide2" fade behaves correctly
or...
"list_slide1" to "list_slide6" instant jump no fade
"list_slide6" to any preceding list-slide1-5 fade behaves correctly
IE:
"list_slide1" to "list_slide3" instant jump with no fade
"list_slide3" to "list_slide1" a second pause then jump
The pagers and the images are dynamically generated from a database (hence the little piece of PHP at the bottom of the code). it contains as many items as are listed for the page in the database.
a few notes:
1) the fade function is my own take on
http://javascript.info/tutorial/animation and has worked just fine in
another slideshow elsewhere on the site.
2) getElementsByClass is from http://www.robertnyman.com and returns
parent and child elements of the requested class in an array (hence
why I call current[0] etc.)
thanks.
<script type="text/javascript">
var pager = document.getElementById('pager1');
var list_pagers = document.getElementById('pagers')
var i = 0;
var next_slide = function(next) {
if (next.className !== 'slide_current') {
if (getElementsByClassName('slide_pending').length === 0) {
var current = getElementsByClassName('slide_current');
next.className = 'slide_pending';
next.style.zIndex = 5;
next.style.opacity = 1;
next.style.filter = 'alpha(opacity = 100)';
next.style.display = 'block';
fade(current[0], linear, 1000);
var fadeSlide = switcher(next, current);
}
}
}
var switcher = function(now, then) {
setTimeout(function() {
now.className = 'slide_current';
now.style.zIndex = 10;
now.style.opacity = 1;
now.style.filter = 'alpha(opacity = 100)';
then[0].className = 'slide_hide';
then[0].style.zIndex = 0;
then[0].style.opacity = 0;
then[0].style.filter = 'alpha(opacity = 0)';
then[0].style.display = 'none';
}, 1001);
}
<?php
// dynamically build event for each pager/slide in the show.
for ($k = 1; $k <= $i; $k++) {
echo 'var next_slide' .$k. ' = document.getElementById("list_slide" +' .$k. '); ',
'addEvent(list_pagers.childNodes[' .($k - 1). '], "click", function () {next_slide(next_slide' .$k. ')}); ';
}
?>
Forgive me for not posting an answer to your exact problem, but I would steer away from writing Javascript plugins yourself for the following reasons:
Hundreds of them exist on the Web already, some of which are developed on GitHub as open source, preventing potential issues through collaborative development.
There is no need to reinvent the wheel; simply spend 20 minutes googling javascript sliders and find one that you can customise to your needs.
A couple I like using are 'caroufredsel', which is responsive and offers a few nice features (dynamically adding items, callbacks etc).
Another is 'flexslider'.
SOLUTION:
the problem was that the <div> tags i was trying to fade each contained an <img> and another <div>... the CSS being applied was either working inconsistently/erratically or - as is IE's wont - not-at-all.... The solution was - rather than animating the fade of the parent <div> - animating the respective child components separately. At first, it looked like the IE solution was completely unto itself; in fact, it was insightful to creating a neat, lightweight non-JQuery slideshow for all the browsers. One trade-off was that I had to incorporate all the styling into the element tags rather than a separate CSS. This seemed like the only viable option in this instance by virtue of the nature of the DOM requests being made...
Questions/feedback gratefully received:
<script type="text/javascript">
var list_pagers = document.getElementById('pagers')
var i = 0;
<?php
// dynamically build event for each pager/slide in the show.
for ($k = 1; $k <= $i; $k++) {
echo 'var next_slide' .$k. ' = document.getElementById("list_slide" +' .$k. '); ',
'addEvent(list_pagers.childNodes[' .($k - 1). '], "click", function () {next_slide(next_slide' .$k. ')}); ';
}
?>
var next_slide = function(next) {
if (next.className !== 'slide_current') {
if (navigator.appName === 'Microsoft Internet Explorer') {
//IE 7 & 8
if ((navigator.appVersion.search('MSIE 8.0') >= 1) || (navigator.appVersion.search('MSIE 7.0') >= 1)) {
var current = getElementsByClassName('slide_current')[0].childNodes[0];
var currentBar = getElementsByClassName('slide_current')[0].childNodes[1];
var nextBar = next.childNodes[1];
var nextSlide = next.childNodes[0];
} else {
//IE 9
var current = getElementsByClassName('slide_current')[0].childNodes[1];
var currentBar = getElementsByClassName('slide_current')[0].childNodes[2];
var nextBar = next.childNodes[2];
var nextSlide = next.childNodes[1];
}
// give the next slide and its header (nextBar) a temporary status of zIndex 5/6
nextSlide.style.zIndex = 5;
nextBar.style.zIndex = 6;
nextSlide.style.filter = "alpha(opacity=100)";
nextBar.style.filter = "alpha(opacity=85)";
fade(currentBar, linear, 500); // fade currentBar out
fade(current, linear, 500); // fade current out
//once we've faded out current slides, it's time to replace them with th
setTimeout(function() {
getElementsByClassName('slide_current')[0].className = 'slide_hide';
next.className = 'slide_current';
nextSlide.style.opacity = 1; // IE 9 includes opacity...
nextBar.style.opacity = 1; // IE 9 includes opacity...
nextSlide.style.filter = "alpha(opacity=100)";
nextBar.style.filter = "alpha(opacity=85)";
nextSlide.style.zIndex = 10;
nextBar.style.zIndex = 11;
}, 500);
} else {
// NON IE TAGS
var current = getElementsByClassName('slide_current')[0];
current.childNodes[1].style.zIndex = 10; // [1] the child <img> tag
current.childNodes[2].style.zIndex = 11; // [2] the child <div> tag
current.childNodes[1].style.opacity = 1;
current.childNodes[2].style.opacity = 0.85;
next.childNodes[1].style.zIndex = 5;
next.childNodes[2].style.zIndex = 6;
next.childNodes[1].style.opacity = 1;
next.childNodes[2].style.opacity = 0.85;
fade(current.childNodes[1], linear, 600); // fade current out
fade(current.childNodes[2], linear, 600); // fade current out
var fadeSlide = setTimeout(function() {switcher(next, current)}, 500);
var switcher = function(now, then, nowBar, thenBar) {
then.className = 'slide_hide';
then.childNodes[1].style.opacity = 0;
then.childNodes[2].style.opacity = 0;
now.className = 'slide_current';
now.childNodes[1].style.opacity = 1;
now.childNodes[2].style.opacity = 0.85;
now.style.opacity = 1;
}
}
}
}
</script>
I have this code
var timeout = 0;
$('#container td').each(function(){
var td = this;
setTimeout(function() {
var new_text = $(td).find(text).html();
popup_text.html(new_text);
popup.fadeIn('fast').delay(1000).fadeOut('slow');
}, timeout);
timeout += 1000 + 1000;
});
I get text from table cells and is displayed in the layer with a delay.
1 question: How do I make this code to run in an endless loop?
2 question: How to do that when you hover the mouse over popop cycle temporarily stopped and then continue?
Thanks a lot!
One way is to put the code to be repeated in a function, and have the function repeat itself at the end:
var timeout = 1000;
var action = function() {
// Do stuff here
setTimeout(action, timeout);
};
action();
However, as ahren suggested, setInterval might be better:
var timeout = 1000;
var action = function() {
// Do stuff here
};
setInterval(action, timeout);
The difference is slight, but if the machine is running slowly for some reason, the setInterval version will run the code every second on average, whereas the setTimeout version will run the code once each second at most.
Neither of those methods really work well with each(), however, so you'll need to store the sequence of popups somewhere and step through them:
var timeout = 1000;
var tds = $('#container td');
var index = 0;
var action = function() {
var td = tds[index];
var new_text = $(td).html();
popup.html(new_text);
popup.fadeIn('fast').delay(1000).fadeOut('slow');
if(++index >= tds.length)
index = 0;
};
setInterval(action, timeout);
action();
Finally, to avoid moving to the next popup while the popup is hovered, you can add a check for that at the start of the function. It's also necessary to rearrange the animations so that they go "check for hover - fade out - change text - fade in".
var timeout = 1000;
var tds = $('#container td');
var index = 0;
var action = function() {
if(popup.is(':hover'))
return;
var td = tds[index];
var new_text = $(td).html();
popup.fadeOut('slow', function() {
popup.html(new_text);
}).fadeIn('fast');
if(++index >= tds.length)
index = 0;
};
setInterval(action, timeout);
action();
jsFiddle: http://jsfiddle.net/qWkYE/2/
If you like the short clean way, then use the jquery-timing plugin and write:
$.fn.waitNoHover = function(){
return this.is(':hover') ? this.wait('mouseleave') : this;
};
$('#popups div').repeat().each($).fadeIn('fast',$)
.wait(200).waitNoHover().fadeOut('slow',$).all()
See this on http://jsfiddle.net/creativecouple/fPQdU/3/
I'm looking to build a very simple whack a mole-esque game in javascript. Right now I know how to do everything else except the scoring. My current animation code is as follows
<script language="JavaScript"
type="text/javascript">
var urls;
function animate(pos) {
pos %= urls.length;
document.images["animation"].src=urls[pos];
window.setTimeout("animate(" + (pos + 1) + ");",
500);
}
window.onload = function() {
urls = new Array(
"Frame1.jpg","Frame2.jpg"
);
animate(0);
}
</script>
So far it all works, the first frame is the hole and the second is the groundhog/mole out of the hole. I need to count the clicks on the second frame but I can't figure out how to incorporate a counter. Help? (Sorry if the code doesn't show up correctly, first time using this site)
Here is an example that counts clicks on the flashing animation: http://jsfiddle.net/maniator/TQqJ8/
JS:
function animate(pos) {
pos %= urls.length;
var animation = document.getElementById('animation');
var counter = document.getElementById('counter');
animation.src = urls[pos];
animation.onclick = function() {
counter.innerHTML = parseInt(counter.innerHTML) + 1;
}
setTimeout(function() {
animate(++pos);
}, 500);
}
UPDATE:
Here is a fiddle that only detects click on one of the images: http://jsfiddle.net/maniator/TQqJ8/8/