I am trying to have a event happen at a current time through an audio file. The following code currently works and successfully plays the audio file:
<html>
<head>
<style>
.titletext {
color: white;
display: block;
position: absolute;
font-size: 50px;
width: 1000px;
margin-left: 150px;
margin-right: 200px;
}
.nametext {
color: white;
display: block;
position: absolute;
font-size: 30px;
width: 600px;
margin-left: 500px;
margin-right: 200px;
margin-top: 600px;
}
.earthphoto {
display: block;
position: absolute;
margin-left: 400px;
margin-top: 150px;
}
</style>
</head>
<body onload="update()">
<script type="text/javascript">
document.body.style.background="black";
var changescene=function(){
var allvariables=Object.keys( window );
if(page===1){
console.log(allvariables);
}
page++;
update();
};
var page=1;
var playsound=function(){
if(page===1){
document.getElementById("sound1").play();
document.getElementById("sound1").addEventListener("ended",function(){changescene();});
}
};
var update=function(){
if(page===1){
document.body.innerHTML="";
var text=document.createElement("p");
var textclass = document.createAttribute("class");
textclass.value="titletext";
text.setAttributeNode(textclass);
text.appendChild(document.createTextNode("Welcome to Mikey's Google Earth Presentation!"));
document.body.appendChild(text);
var text2=document.createElement("p");
text2class=document.createAttribute("class");
text2class.value="nametext";
text2.setAttributeNode(text2class);
text2.appendChild(document.createTextNode("By Mikey Richards"));
document.body.appendChild(text2);
googleearthimage=document.createElement("img");
googleearthimage.setAttribute("src","EARTH.png");
googleearthimage.setAttribute("class","earthphoto");
document.body.appendChild(googleearthimage);
var music=document.createElement("audio");
var musiclink=document.createElement("source");
musiclink.src="Slide1.mp3";
music.appendChild(musiclink);
var musicclass=document.createAttribute("id");
musicclass.value="sound1";
music.setAttributeNode(musicclass);
document.body.appendChild(music);
playsound();
}else if(page===2){
document.body.innerHTML="";
}
};
</script>
</body>
</html>
However, although this works for playing the audio file, when I add this code to run some code when it reaches a certain point, it crashes.
while(document.getElementById("sound1").currentTime<16){
}
//insert code here
I place this code in the playsound function directly after the play function for the audio, so the audio file should be playing. Why does the file crash.
Here is a link to see the result of the file:
http://www.presentation.bugs3.com/presentation.html
You effectively have a while(true){} loop in your code. while executes synchronously, which means that there is no break in the execution loop for anything else to happen, like the audio to advance. You only want to use while if the loop itself modifies the condition while is checking. Depending on exactly what you want to do, i'd use setTimeout or setInterval. If you want to stop it after 16 seconds, I'd do
setTimeout(
function(){document.getElementById("sound1").pause()},
16000)
alternatively
var curInterval = setInterval(
function(){
if(document.getElementById("sound1").currentTime<16)
{
doSomething();
}
else
{
clearInterval(curInterval);
doSomethingElse();
}
},
200) //whatever interval makes sense to you.
Related
I'm currently using setInterval( () => {}, 16 ) to run my code 60fps, but this makes the code run at 62.5fps, which makes the game movements jump forward twice the speed for a few frames per second. Using interval 17 makes the game movement freeze for a frame every once in a while.
How can I run the code truly at 60fps for maximum smoothness?
use Window.requestAnimationFrame([callback])
That way your application will be called when it's time to render, wether the monitor is 30hz, 60hz or 120hz or more.
See this example from https://css-tricks.com/using-requestanimationframe/ on how to use it if the MDN documentation isn't clear enough.
var globalID;
function repeatOften() {
$("<div />").appendTo("body");
globalID = requestAnimationFrame(repeatOften);
}
globalID = requestAnimationFrame(repeatOften);
$("#stop").on("click", function() {
cancelAnimationFrame(globalID);
});
$("#start").on("click", function() {
globalID = requestAnimationFrame(repeatOften);
});
div {
width: 10px;
height: 10px;
background: orange;
float: left;
}
button {
position: absolute;
top: 20px;
left: 20px;
}
#stop {
left: 100px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button id="start">start</button>
<button id="stop">stop</button>
I am working on a video player that launches a video into an iframe within a div overlay. I want to avoid repetetive code such as onclick=() in every link, and want to avoid external libraries such as jQuery, because jQuery produces an unpleasant flickering screen when my video window is launched.
My problem is that with my work so far, only the first link opens the video overlay. I (somewhat) understand that the [0] indicates the first element in an array. Can an array contain an infinite numerical range, or is there a better way to accomplish my goal here? There will potentially be thousands of videos in these galleries, so listing them one at a time in my script is not practical.
I am still struggling to learn, so a working example would be greatly appreciated. Thanks
My work so far
https://jsfiddle.net/4oomb9rt/
example code
<!doctype html>
<html>
<head>
<title>Video Overlay</title>
<style>
body {
margin: 0;
font-family: arial;
}
#vidPlayer {
height: 100%;
width: 100%;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: #000;
overflow: hidden;
transition: 0.5s;
display: none;
color: white;
}
.closebtn {
position: absolute;
top: 7px;
right: 7px;
font-size: 50px;
}
.openbtn {
font-size: 30px;
}
.openbtn, .closebtn {
max-height: 48px;
max-width: 48px;
min-height: 48px;
min-width: 48px;
border-radius: 7px;
line-height: 12px;
}
.vidContent {
width: 100%;
text-align: center;
font-size: 32px;
}
</style>
</head>
<body>
<div id="vidPlayer">
<button class="closebtn">×</button>
<div class="vidContent">vidplayer content</div>
</div>
<button class="openbtn">☰</button>
<button class="openbtn">☰</button>
<button class="openbtn">☰</button>
<script>
function openNav() {
document.getElementById("vidPlayer").style.display = "block";
}
function closeNav() {
document.getElementById("vidPlayer").style.display = "none";
}
var opener = document.getElementsByClassName('openbtn')[0];
opener.addEventListener("click", function(e) {
openNav();
}, false);
var closer = document.getElementsByClassName('closebtn')[0];
closer.addEventListener("click", function(e) {
closeNav();
}, false);
</script>
</body>
</html>
You can iterate over element using ClassName and assign event listener.
for(var i=0;i<document.getElementsByClassName("openbtn").length;i++){
document.getElementsByClassName("openbtn")[i].addEventListener("click", function(e) {
openNav();
}, false);
}
Demo : https://jsfiddle.net/tj23hy3h/
You are on the right track. You want to make a few minor changes to your javascript.
var openers = document.getElementsByClassName('openbtn');
for(var i=0; i<openers.length; i++) {
openers[i].addEventListener("click", function(e) {
openNav();
}, false);
}
var closers = document.getElementsByClassName('closebtn');
for(var i=0; i<closers.length; i++) {
closers[i].addEventListener("click", function(e) {
closeNav();
}, false);
}
by iterating through all of your openers or closers you can add the listener to each one.
What you're problem is that you'll have to add you event listener to all of the elements of that type so something like this would work:
var opener = document.querySelectorAll('.openbtn');
Array.from(opener).foreach(function(opener_single){
opener_single.addEventListener("click", openNav, false);
});
and then the same theory for the closer elements.
what I'm doing here is I'm getting all elements with the class name of openbutton then looping through them in the loop i am then applying the click event listener in which runs the openNav function.
I'm creating some custom Alert Dialog boxes and while the box styles properly the Ok button that I insert is unresponsive. Below is the code to reference.
function CustomAlert(){
this.render = function(dialog){
...
...
document.getElementById('dialogboxfoot').innerHTML = "<button onclick = 'Alert.ok()'>OK</button>";
}
this.ok = function(){
document.getElementById('dialogbox').style.display = "none";
document.getElementById('dialogoverlay').style.display = "none";
}
}
var Alert = new CustomAlert();
$('#button1').click(function(){
Alert.render("Heyooo!!!");
})
The Alert.render function fires correctly. When I try to trigger the Alert.ok function (inserted with the innerHTML function) I get " Uncaught ReferenceError: Alert is not defined" referencing line 1 of my index.html file, which is the DOCTYPE declaration.
Why is "Alert" not defined when called in this context?
Your question is rather vague. Keep in mind that the JavaScript alert() method cannot be styled, so you would need to create your own modal. I use one like this (very responsive):
function styledAlert(message){
document.getElementById('alertText').innerHTML = message;
document.getElementById('alertWrapper').style.display = 'block';
}
#alertWrapper {
position: absolute;
display: none;
top:0;
left:0;
right:0;
bottom:0;
}
#alertBox {
position: fixed;
top: 25%;
bottom: 25%;
right: 25%;
left: 25%;
background: rgba(0,0,0,0.7);
border-radius: 25px;
}
#alertAccept {
position: absolute;
bottom: 15px;
right: 15px;
}
#alertText {
margin: 15px;
color: white;
}
<div id="alertWrapper"><div id="alertBox"><p id="alertText"></p><button id="alertAccept" onclick="document.getElementById('alertWrapper').style.display = 'none'">OK</button></div></div>
Type in an alert message: <input type="text" onblur="styledAlert(this.value)"/> And then blur the textbox to see the alert . . .
If this is not what you are looking for, please make your question a little more specific on the end result that you are seeking.
I am trying to create a pop-up message that disables the rest of the screen until you confirm it, only by using CSS and JavaScript (and without the alert function).
Although http://msdn.microsoft.com/en-us/library/ie/ms536739%28v=vs.85%29.aspx declares that setAttribute is supported in IE8 and higher, it does not seem to work correctly - well, actually it doesn't seem to work at all.
Here is my code:
<html>
<style type="text/css">
.overlay
{
position: absolute;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
background-color: rgba(0,0,0,0.2);
}
.overlaytext
{
position: absolute;
left: 50%;
margin-left: -150px;
top: 50%;
margin-top: -50px;
width: 300px;
height: 100px;
padding-top: 5px;
background-color: #777777;
color: #000000;
font-size: 20px;
text-align: center;
}
.overlaybutton
{
position: absolute;
left: 50%;
margin-left: -30px;
top: 50%;
margin-top: 20px;
width: 60px;
height: 25px;
border: solid;
border-color: #000000;
border-width: 1px;
background-color: #999999;
color: #000000;
font-size: 20px;
}
</style>
<script type="text/javascript">
function showoverlay(message)
{
var overlay = document.createElement('div');
overlay.setAttribute('id','overlay');
overlay.setAttribute('class','overlay');
document.body.appendChild(overlay);
var overlaytext = document.createElement('div');
overlaytext.setAttribute('id','overlaytext');
overlaytext.setAttribute('class','overlaytext');
overlaytext.innerHTML = message;
document.body.appendChild(overlaytext);
var overlaybutton = document.createElement('input');
overlaybutton.setAttribute('type','button');
overlaybutton.setAttribute('id','overlaybutton');
overlaybutton.setAttribute('class','overlaybutton');
overlaybutton.setAttribute('value','OK');
overlaybutton.setAttribute('onclick','deleteoverlay()');
document.body.appendChild(overlaybutton);
}
function deleteoverlay()
{
var elem = document.getElementById('overlay');
elem.parentNode.removeChild(elem);
elem = document.getElementById('overlaytext');
elem.parentNode.removeChild(elem);
elem = document.getElementById('overlaybutton');
elem.parentNode.removeChild(elem);
}
</script>
<body>
<input type="button" value="Show message" onclick="showoverlay('Message text')"/>
</body>
</html>
It works just fine in Firefox and Chrome, but IE (testing with IE9) seems to ignore the setAttribute method, because it only puts in the text and the button, but without the formatting (i.e. class was not applied) and also clicking the newly created button does not remove the objects (i.e. either id was not applied, or there is some additional incompatibility with portions of the code that remove the objects).
I tried to replace setAttribute like this:
<script type="text/javascript">
function showoverlay(message)
{
var overlay = document.createElement('div');
overlay.id = 'overlay';
overlay.class = 'overlay';
document.body.appendChild(overlay);
var overlaytext = document.createElement('div');
overlaytext.id = 'overlaytext';
overlaytext.class = 'overlaytext';
overlaytext.innerHTML = message;
document.body.appendChild(overlaytext);
var overlaybutton = document.createElement('input');
overlaybutton.type = 'button';
overlaybutton.id = 'overlaybutton';
overlaybutton.class = 'overlaybutton';
overlaybutton.value = 'OK';
overlaybutton.onclick = 'deleteoverlay()';
document.body.appendChild(overlaybutton);
}
function deleteoverlay()
{
var elem = document.getElementById('overlay');
elem.parentNode.removeChild(elem);
elem = document.getElementById('overlaytext');
elem.parentNode.removeChild(elem);
elem = document.getElementById('overlaybutton');
elem.parentNode.removeChild(elem);
}
</script>
But this time it does not even add the text and the button.
So, how to make this script IE compatible, both showing all the elements and then removing them?
Thanks
Use this as your doctype
<!DOCTYPE html>
and then put this in the head of the document
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
and then enjoy using setAttribute and a number of other features which this will allow to properly work on IE8+ environments.
The correct way to set a class in your second example is:
overlaybutton.className = 'overlaybutton';
That will get classes working in IE. As far as deleting elements goes, I'd recommend reformatting your event handling attachment like so:
overlaybutton.onclick = deleteoverlay;
I have run into this issue as well. If you are able to include jQuery on the site, you can use $('#overlay').attr('class', 'overlay');. jQuery is extremely useful for making cross-browser compatible code.
I need to replace our Ajax Modal Popup controls with a JavaScript equivalent. We use this as a simple context sensitive help type popup. I did a quick browse but didn't see quite what I was looking for. I just need some text and a simple Close button/link, but I would like the page darkened below the popup, as it does with the Ajax modal control.
Can anyone suggest a nice JavaScript popup/help type solution that you've used?
I can provide you the code. Do your modifications as necessary, OK?
Page JavaScript:
function myPop() {
this.square = null;
this.overdiv = null;
this.popOut = function(msgtxt) {
//filter:alpha(opacity=25);-moz-opacity:.25;opacity:.25;
this.overdiv = document.createElement("div");
this.overdiv.className = "overdiv";
this.square = document.createElement("div");
this.square.className = "square";
this.square.Code = this;
var msg = document.createElement("div");
msg.className = "msg";
msg.innerHTML = msgtxt;
this.square.appendChild(msg);
var closebtn = document.createElement("button");
closebtn.onclick = function() {
this.parentNode.Code.popIn();
}
closebtn.innerHTML = "Close";
this.square.appendChild(closebtn);
document.body.appendChild(this.overdiv);
document.body.appendChild(this.square);
}
this.popIn = function() {
if (this.square != null) {
document.body.removeChild(this.square);
this.square = null;
}
if (this.overdiv != null) {
document.body.removeChild(this.overdiv);
this.overdiv = null;
}
}
}
Now the HTML page, using the JavaScript file:
<html>
<head>
<script type="text/javascript" src="NAME OF THE PAGE!.js"></script>
<style>
div.overdiv { filter: alpha(opacity=75);
-moz-opacity: .75;
opacity: .75;
background-color: #c0c0c0;
position: absolute;
top: 0px;
left: 0px;
width: 100%; height: 100%; }
div.square { position: absolute;
top: 200px;
left: 200px;
background-color: Menu;
border: #f9f9f9;
height: 200px;
width: 300px; }
div.square div.msg { color: #3e6bc2;
font-size: 15px;
padding: 15px; }
</style>
</head>
<body>
<div style="background-color: red; width: 200px; height: 300px;
padding: 20px; margin: 20px;"></div>
<script type="text/javascript">
var pop = new myPop();
pop.popOut("Jose leal");
</script>
</body>
</html>
Hope that this can help.
I've used the simplemodal jQuery plugin and I've been quite happy with it. You can check it out here.
Maybe you are looking for something like this? [ui.jquery.com]
It's the simplest one, and can come bundled with a lot of other eye candy. Of course you could also look around the rest of the jQuery plug-ins page, specially the Windows and Overlays section.
I developed a javascript library called Msg. It allows to easily create a modal window / popup. It creates an overlay behind it that darkens the background. It has no close button but it can be closed by clicking the background overlay.