I thought I'd write a simple script to animate my webpage a little.
The basic idea was to make a div grow bigger, when I push a button once and then shrink to it's original size, when I push it again. I handled the growing part well, but I can't get it to shrink again.
I'm including a complete example, could you help me fix it?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Test</title>
<meta http-equiv="Content-Language" content="Estonian" />
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15" />
</head>
<body>
<script type="text/javascript">
var i;
var increasing = new Boolean("true");
var height;
function testFunction() {
height = parseInt(document.getElementById("testDiv").offsetHeight);
if( increasing == true ) {
i = height + 4;
document.getElementById("testDiv").style.height = i + "px";
if( height >= 304 ) {
increasing = false;
}
else {
pause(30);
}
}
else {
i = height - 4;
document.getElementById("testDiv").style.height = i + "px";
if( height <= 104 ) {
increasing = true;
}
else {
pause(30);
}
}
}
function pause(ms) {
setTimeout("testFunction()", ms);
}
</script>
<button id="button" type="button" onclick="testFunction();">Do it!</button.
<div id="testDiv" style="border: 2px solid black; width: 400px; height: 100px; text-align: center;">
Hello!
</div>
</body>
</html>
Use a standard library like jQuery to do this, don't do it yourself as it won't be cross-browser for sure.
With jQuery, you can do things like this:
$("#div-id").animate({"height": 300}, 1000);
That'll change the div height to 300 px in 1000 ms = 1 second.
Related
I have worked through the dosbox Div to find the canvas, but once I have found the node holding the canvas how can I reference it?
Getting the context of dbGranChild[0] just results in an error..
Im trying to build an array of the pixels that make up the dosbox window, so thought using the canvas get image and looping through as frames change would be one way. If there is a better way altogether than my above attempt happy to take that as an answer.
Code: http://plnkr.co/edit/MC1n9HfwWcqXlAk95XCO?p=preview
<!doctype html>
<html lang="en-us">
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>js-dos api</title>
<style type="text/css">
.dosbox-container { width: 640px; height: 400px; }
.dosbox-container > .dosbox-overlay { background: url(https://js-dos.com/cdn/digger.png); }
.dosbox-start { font-size: 35px !important; }
</style>
</head>
<body>
<div id="dosbox"></div>
<br/>
<button onclick="dosbox.requestFullScreen();">Make fullscreen</button>
<script type="text/javascript" src="https://js-dos.com/cdn/js-dos-api.js"></script>
<script type="text/javascript">
var dosbox = new Dosbox({
id: "dosbox",
onload: function (dosbox) {
dosbox.run("https://js-dos.com/cdn/digger.zip", "./DIGGER.COM");
},
onrun: function (dosbox, app) {
console.log("App '" + app + "' is runned");
}
});
var dosboxId = document.getElementById('dosbox');
dbChild = dosboxId.childNodes;
dbGranChild = dbChild[0].childNodes;
console.log(dbGranChild[0])
</script>
</body>
</html>
See the w3Schools tutorial.
First, you need to use a <canvas> tag instead of a <div>.
That is, replace this:
<div id="dosbox"></div>
with something like this:
<canvas id="dosbox" width="200" height="100" style="border:1px solid #000000;">
</canvas>`
Second, replace this code:
var dosboxId = document.getElementById('dosbox');
dbChild = dosboxId.childNodes;
dbGranChild = dbChild[0].childNodes;
console.log(dbGranChild[0])
With something like this:
var c = document.getElementById("dosbox");
var ctx = c.getContext("2d");
ctx.moveTo(0, 0);
ctx.lineTo(200, 100);
ctx.stroke();
First off, please don't yell at me for asking this question. I know there is already a million topics on this, and sadly I have read through them all and I STILL can't figure out what I am doing wrong.
I created just a simple site to try understand how this works so that I can implement it on a more complex site.
I am just using one of the many scripts I have found and tried. All of them didn't have any effect.
The HTML File:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title> </title>
<meta charset="utf-8">
<link href='http://fonts.googleapis.com/css?family=Source+Code+Pro:300,400' rel='stylesheet' type='text/css'>
<script type="text/javascript" src="scripts/jquery-1.11.1.js"></script>
<script type="text/javascript" src="http://www.queness.com/js/bsa.js"></script>
<link rel="stylesheet" href="styles.css">
<script type="text/javascript">
$(document).ready(function() {
var colordivs = $('#fade div');
$(document).scroll(function(e) {
var scrollPercent = ($(window).scrollTop() / $('#fade').outerHeight()) * 100;
if (scrollPercent > 0) {
if (scrollPercent < 33) {
var opacity = 1 - (scrollPercent / 33);
$(colordivs[0]).css('opacity', opacity);
}
else if (scrollPercent > 66) {
var opacity = 1 - (scrollPercent / 100);
$(colordivs[0]).css('opacity', 0);
$(colordivs[1]).css('opacity', 0);
$(colordivs[2]).css('opacity', opacity);
}
else if (scrollPercent > 33) {
var opacity = 1 - (scrollPercent / 66);
$(colordivs[0]).css('opacity', 0);
$(colordivs[1]).css('opacity', opacity);
}
}
});
});
</script>
</head>
<body>
<div class="container">
<div id="fade">
</div>
</div>
</body>
</html>
The CSS file:
body {
background-color: #ffcc00;
}
.container {
height: 6000px;
width: 100%;
margin: 0 auto;
}
#fade {
background-image: url("skyline.png");
width: 100%;
height: 600px;
position: fixed;
overflow: hidden:
}
So I guess my first question is do I have everything? Am I missing a jquery script or something. and second does it matter where the css file is as along as its linked correctly in the html file? Like I said, I don't completely understand how the changing opacity works if it has anything to do with the css file.
I understand HTML and CSS completely and I understand what is going on in the script just fine, I just can't figure out why they aren't talking with each other and causing a change.
Thanks in advance for any guidance!
Change
var colordivs = $('#fade div');
to
var colordivs = $('#fade');
I have a very simple progress bar im making and everything works except for one thing...the percent sign. My code is below and my question is how would add a percent sign to this without messing up the script. - JsFiddle
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="icon" href="Assets/IMG/Roz.png" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Apache Testing Server</title>
<style type="text/css">
#ProgressWrap {
height:30px;
width:300px;
border:1px solid #222;
text-align:center;
position:relative;
}
#ProgressStat {
height:30px;
width:0%;
background-color:#9CF;
position:absolute;
top:0px;
left:0px;
}
#ProgressPer {
width:100%;
height:30px;
line-height:30px;
position:absolute;
top:0px;
left:0px;
z-index:1000;
}
</style>
<script type="text/javascript">
window.onload = function() {
document.getElementById('ProgressPer').innerHTML = 0;
var Change = setInterval(function() {
var Per = document.getElementById('ProgressPer').innerHTML;
++Per
if(Per == 101)
{
clearInterval(Change);
}
else
{
document.getElementById('ProgressPer').innerHTML = Per;
var Bar = document.getElementById('ProgressStat');
Bar.style.width = Per + '%';
}
}, 50);
}
</script>
</head>
<body>
<div id="ProgressWrap">
<div id="ProgressPer"></div>
<div id="ProgressStat"></div>
</div>
</body>
</html>
You need to change these two lines:
var Per = document.getElementById('ProgressPer').innerHTML.replace('%','');
and
document.getElementById('ProgressPer').innerHTML = Per.toString() + '%';
See the fiddle.
There's nothing wrong with your code but it doesn't really follow javascript style guidelines. Also, it's not necessary to take the innerHTML value in your calculations. Here's another version to consider going forward.
var pct = 0,
change = setInterval(function () {
++pct;
if (pct == 101) {
clearInterval(change);
} else {
document.getElementById('ProgressPer').innerHTML = pct.toString() + '%';
var bar = document.getElementById('ProgressStat');
bar.style.width = pct + '%';
}
}, 50);
I'm learning JavaScript and created a countdown timer HTML page in which javascript code seems to be returning a wrong clientHeight of the body. I want to show my countdown HTML <div> in middle (vertically) of the body even when browser is re-sized. Please tell me where I am wrong.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>CountDown Timer</title>
<script type="text/javascript" >
function countdown(){
if(isNaN(document.getElementById("time").value))
{
document.getElementById("time").value = "Enter Valid Number";
return;
}
else
{
var i = document.getElementById("time").value;
var j=setInterval(function (){document.getElementById("new").innerHTML = i; i--;
if(i == -2){
document.getElementById("new").innerHTML = "Welcome";
clearInterval(j);}},1000);
}
}
function heightadjust(){
document.getElementById("main1").style.top = ((document.body.clientHeight/2)+54).toString() + "px";
}
</script>
</head>
<body onresize="heightadjust();" onload="heightadjust();">
<div style="margin:0 auto;" id="main1">
<center>
<div id="new" style="display:inline-block; padding:3px; font-size:60px; text-align:center; border:3px solid #000000; background-color:#CC3300; color:#FFFFFF; border-radius:6px;">Enter Time Below</div>
<br />
<input type="text" id="time" onfocus="this.value = ''; this.style.color = '#000000';" value="Enter Time here" style="color:#999999;" />
<button onclick="countdown();" >Start</button>
</center>
</div>
</body>
</html>
Please, give me some tips how to keep <div> vertically centred even if browsers are re-sized.
You don't need JS for that.
#in_the_middle {
position:fixed;
left:50%;
top:100%;
width:200px;
margin-left:-100px; /* MUST be equal to width * -0.5 */
height:50px;
margin-top:-25px; /* SHOULD equal height * -0.5, but can vary for different fx */
line-height:50px; /* Remove if there may be more than one line inside */
}
I want to update the timestamp on useronline database only when people aren't idle (keyboard mouse active for some time-I am using a jquery plugin for that) The problem for me is that I can't clear the interval for the function so in my test script below, when it starts counting it never stops and even when active again it starts another counter so that its like its counting twice as fast. How am I supposed to stop that timer? Its like the counter has never been started when its idle- so it can't find it to stop it.
In the real script the counter will be $.get()-ing the php that updates the mysql table. For that reason i'm using intervals, or it would get on every mouse move right? and that would be loading the server.
http://jsbin.com/uleza5 to test just don't move mouse for 6 seconds then see the idle text, then move the mouse and it will start counting; after 6 seconds it will go idle again when inactive.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script><script src="js/jquery_plugin_timer2.js"></script>
<script src="https://github.com/paulirish/jquery-idletimer/raw/master/jquery.idle-timer.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>timertest</title>
<script language="javascript">
$(document).ready(function(){
$('.status').html('active');
});
x = 0;
function count() {
x+=1;
$('.usercount').html(x);
}
(function() {
var timeout = 6000;
var it;
$(document).bind("idle.idleTimer", function() {
clearInterval(it);
$('.status').html('idle');
});
$(document).bind("active.idleTimer", function() {
var it = setInterval(count, 1000);
$('.status').html('active');
});
$.idleTimer(timeout);
})(jQuery);
</script>
</head>
<body>
<div class="status" style="border:1px dashed black; width:500px; height:50px;"></div>
<div class="usercount"style="border:1px dashed black; width:500px; height:50px;"></div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script><script src="js/jquery_plugin_timer2.js"></script>
<script src="https://github.com/paulirish/jquery-idletimer/raw/master/jquery.idle-timer.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>timertest</title>
<script language="javascript">
var it;
$(document).ready(function(){
$('.status').html('active');
});
x = 0;
function count() {
x+=1;
$('.usercount').html(x);
}
(function() {
var timeout = 6000;
$(document).bind("idle.idleTimer", function() {
clearInterval(it);
$('.status').html('idle');
});
$(document).bind("active.idleTimer", function() {
it = setInterval(count, 1000);
$('.status').html('active');
});
$.idleTimer(timeout);
})(jQuery);
</script>
</head>
<body>
<div class="status" style="border:1px dashed black; width:500px; height:50px;"></div>
<div class="usercount"style="border:1px dashed black; width:500px; height:50px;"></div>
</body>
</html>