I made this really basic startup page in HTML that has images that reference websites. Is there a way to add a loader after the user clicks on the image then the loader goes away when the website comes up? I am trying to give users something to look at while a website loads. Below is a sample href line that I use.
<img border="0" alt="Image" src="logo.gif">
I found this onclick script online but I do not know how to add it to my startup page. Can anyone help me put these together? Where should I place the line 'onclick="myFunction()?"'Thank you!
onclick="myFunction()"
<script>
var myVar;
function myFunction() {
myVar = setTimeout(showPage, 3000);
}
function showPage() {
document.getElementById("loader").style.display = "none";
document.getElementById("myDiv").style.display = "block";
}
</script>
Here is an example of something you need,.
A loader will be displayed when you click on the button, and disappears after the website loads.
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
var myVar;
$( "#myDiv" ).click(function() {
myFunction(this);
});
function myFunction(div) {
$("#loader").toggle();
$(div).toggle();
}
});
</script>
</head>
<body>
<a id="myDiv" href="https://Website.com">Click me</a>
<div id="loader" style="display:none;background:green;padding:150px">This is a loader</div>
</body>
</html>
Here is a working DEMO
You may refer to the following link, it properly explains, how it is too be done.
http://blog.teamtreehouse.com/learn-asynchronous-image-loading-javascript
Related
I am trying to learn jQuery and I am confused how document.ready() function works
$(document).ready(function(){}
In html,
<script type="text/javascript" src="jquery.js"></script>
<script src="script.js" type="text/javascript"></script>
links are at the very bottom of the document, just before the closing body tag. In my javaScript file, I have all my code inside the .ready function. Yet, when I load the page, and I hover over a link, my cursor doesn't turn into a pointer for a couple of seconds, and if I immediately scroll down, the text is not yet loaded for a couple of seconds, either.
My javaScript file has a bunch of iframes etc... so I can understand why the delay, but what confuses me is that I thought the whole point of the .ready function was that the javaScript wasn't loaded until everything else in the page was loaded first? So surely my text and my css should be working straight away? Here is my code if it helps. I can post css too if required.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>myPage</title>
<link rel="stylesheet" type="text/css" href="styles2.css">
</head>
<body>
<div id="container">
<div id="backgroundLeft"><img id='backgroundLeftImage' src="Left.jpg" width="100%"></div>
<div id="wrap">
<p id="text">...some text... <span id="firstLink" class="link">click me</span>.<span><iframe id="frame" class="rect" scrolling="no" marginwidth=0 marginheight=0></iframe>
</span> ...some more text.... <span id="secondLink" class="link">click me</span>,
</span><span>
<iframe id="frame2" class="rect" scrolling="no" marginwidth=0 marginheight=0></iframe>
</span>
... some more text... <span id="thirdLink" class="link">click me</span> </span><span>
<iframe id="frame3" class="rect" scrolling="no" marginwidth=0 marginheight=0></iframe>
</span> ... some more text...
ETC...
</p>
</div>
<div id="backgroundRight"><img id='backgroundRightImage' src="2VillesRight.jpg" width="100%"></div>
<script type="text/javascript" src="jquery.js"></script>
<script src="script2.js" type="text/javascript"></script>
</body>
</html>
js
$(document).ready(function(){
var frame = $("#frame");
frame.attr("src","iframe.html");
var frame2 = $("#frame2");
frame2.attr("src","iframe2.html");
var frame3 = $("#frame3");
etc...
var player;
frame.bind("load", function () {
player = $(this).contents().find("#firstVid");
player.on('ended', function () {
frame.removeClass("open");
});
});
$("#firsLink").click(function(){
if (frame.hasClass("open"))
{
frame.removeClass("open");
player[0].pause();
}
else {
frame.addClass("open");
player[0].play();
}
});
var player2;
frame2.bind("load", function () {
player2 = $(this).contents().find("#sylvainVid");
player2.on('ended', function () {
frame2.removeClass("open");
});
});
$("#secondLink").click(function(){
if (frame2.hasClass("open"))
{
frame2.removeClass("open");
player2[0].pause();
}
else {
frame2.addClass("open");
player2[0].play();
}
});
var player3;
frame3.bind("load", function () {
player3 = $(this).contents().find("#etienneVid");
player3.on('ended', function () {
frame3.removeClass("open");
});
});
$("#thirdLink").click(function(){
if (frame3.hasClass("open"))
{
frame3.removeClass("open");
player3[0].pause();
}
else {
frame3.addClass("open");
player3[0].play();
}
});
etc...
});
I do know my code is repetitive, I am teaching myself so focused on getting it to work for now. Why is my main page taking so long to load if all my code is inside the "document.ready"? Thanks for your time
you can instead bind your javascript to the window.load event like this
Edit: tis is not good practice and unsupported in newer versions of jQuery
$(window).load(function(){ ... });
Correct way to do this
$(window).on("load", function(){ ... });
document ready lets you access the complete markup, even if the images and iframes have not loaded yet, this is desired in most cases.
In your case however, you might want to take the time penalty of waiting for everything to load, this is that the window.load event does.
$(document).ready() will only wait for all of the page's elements to load. It will NOT wait for the iFrames to load their content.
You can refer to this post if you have more questions:
$(document).ready and iframe content
Are you sure JQuery is loading properly? The source (src) property needs to point to the correct path. I find using the developer's tools to review errors, manipulate CSS and check DOM state to be helpful when learning. I prefer Chrome.
Happened to me too. What I found that, the solution is to include the file at the bottom outside of html tag (i.e the file in which you are using $(document).ready() ).
I assume that, this is because the html document is not ready by the time when browser compiler reached at this function.
So, I have this HTML document
<!DOCTYPE html>
<html>
<head>
<title>TestPage</title>
<script src="script.js"></script>
</head>
<body>
<p id="test">Sample text</p>
</body>
</html>
With this JS file
window.addEventListener("load", MyFunction());
function MyFunction(){
document.getElementById("test").innerHTML = "it worked";
}
and ofcourse this doesn't work (the text isn't changed), since it loads the script before it actually loads the <p id="test"></p> element (I think). It may seem strange, but I want to change the content of some elements, after everything has loaded. I have searched, but to no avail. I'm missing something obvious here probably, but I can't seem to figure it out. Any advice would be appreciated!
You're calling the function in the setup for your "load" event.
Did you mean:
window.addEventListener("load", MyFunction);
??
Try:
window.onload = function () {
MyFunction()
}
function MyFunction(){
document.getElementById("test").innerHTML = "it worked";
}
Source: Execute Javascript When Page Has Fully Loaded
Simply add this to your body tag :
<body onload=myFunction()>
function myFunction(){
document.getElementById("test").innerHTML = "it worked";
}
Suppose I have a page named a.html and a picture x.
Now, when users go to a.html, I want to show the picture x for 3/4s then I want to show the page content.
Can anyone help me to do this?
Here is a small code that will use pure js to show a image prior to showing the content of the site. I think this is similar to what people use to show a loading image before loading the content.
<html>
<head>
<title>Image before loading content</title>
</head>
<body onload="show();">
<div id = "myDiv">
<img id = "myImage" src = "http://jimpunk.net/Loading/wp-content/uploads/loading45.gif">
</div>
<div id="content" style="display: none;">
This is a CONTENT SECTION Put your content here
</div>
<script type = "text/javascript">
function show() {
document.getElementById("myDiv").style.display="block";
setTimeout("hide()", 5000); // 5 wait, change the delay here
}
function hide() {
document.getElementById("myDiv").style.display="none";
document.getElementById("content").style.display="block";
}
</script>
</body>
This yo can put in a HTML page and you shold be able to see where i made the image and where the delay time will be happening.
Here is a working example using the above code: https://jsbin.com/pixemiwubu/edit?html,output
I just started learning Javascript, and I know next to nothing. I am trying to attached an onclick event to an element in my HTML.
var joinList = function() {
alert("This should display when clicked");
}
document.getElementById("header").onclick = joinList;
This is my code so far. Nothing happens when the element with the ID of header is clicked on. What am I doing wrong?
the following is my HTML code
<!DOCTYPE html>
<html>
<head>
<title>Testing Page</title>
<script src="testing.js"></script>
</head>
<body>
<h1 id="header">Andrew Dawson</h1>
</body>
</html>
The issue is, that you try to load a html element, which does not "exists" when the javascript function is executed, because the dom has not finished loading.
To make your code work, you can try following solutions:
Place your script tag below in the HTML:
<!DOCTYPE html>
<html>
<head>
<title>Testing Page</title>
</head>
<body>
<h1 id="header">Andrew Dawson</h1>
<script src="testing.js"></script>
</body>
</html>
Add an event handler to check if the window element is ready:
window.addEventListener("load", eventWindowLoaded, false);
function eventWindowLoaded(){
var joinList = function() {
alert("This should display when clicked");
}
document.getElementById("header").onclick = joinList;
}
Another solution would be to use jquery framework and the related document ready function
http://api.jquery.com/ready/
I think the solve you are looking for is
var joinList = function() {
alert("This should display when clicked");
}
document.getElementById("header").setAttribute("onclick", joinList);
Your code seems straight forward, maybe your script is running before the DOM fully loads. To keep it simple across all browsers we can place a self executing anonymous function at the end to initiate all your scripts after DOM loads.
<html>
<title></title>
<head></head>
<body>
html here!!
<script>
(function() {
//Any other scripts here
var joinList = function() {
alert("This should display when clicked");
}
document.getElementById("header").onclick = joinList;
})();
</script>
</body>
</html>
The above is purely javascript, not to be confused with the shorthand (see below) of the jquery "document onready" function (you would need to add jquery to your pages).
$(function() {
//your javascript code here
});
Why using self executing function?
I have a master page Root.master and a page default.aspx . I want to display progress bar until whole default.aspx page is loaded .
I tried following code:-
<html>
<head><title>xx</title>
</head>
<body style="visibility:hidden;" onload="function(){document.body.visibility='visible'}">
<img src="xxxx.gif" style="visibility:visible !important">
</body>
</html>
But problem is that I do not have body on default.aspx , it is on root.master , if we put it on root.master, it apply all pages which inherit from root.master .
So there is another for it .
Please suggest me usable link or samples.
in your sample if you are using jQuery, you can use following re-factoring to your code
$(document).load(function(){
$('body').css('visibility','visible');
}
You can add a reference to jQuery and then do a little code something like:
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(){ // Wait until the page has finished loading
if ($(".ProgressBar")) // Detect the element with class ProgressBar
{
$(".ProgressBar").hide(); // If found, set it to be display:none;
}
}
</script>
</head>
<body>
<div class="ProgressBar">
<img src="Whatever.gif" alt="Please wait..." />
</div>
</body>
</html>
Also doable without jQuery but it's just so much easier to use it ;)
That way the progress bar gif loads, and once the page is done it is set to invisible.
I hope that might help! Good luck.
You don't mention any libraries, so here is a pure js solution:
http://jsfiddle.net/TTU7v/
The idea is to put the script as close to the opening body tag (but after it!) as possible:
<script type="text/javascript">
var body = document.getElementsByTagName("body")[0];
body.style.visibility = "hidden";
window.onload = function(){body.style.visibility = "visible";};
</script>