Develop Reference

jQueryUI animate(color) doesn't work

I want to animate background color of input element, but it doesn't works :(
JavaScript (when submit):
function sendImage() {
formularz = $('form#sendImage');
autor = formularz.children('input[name=autor]');
if (autor.val().length < 1 || autor.val().length > 20) {
console.log('start');
autor.animate({
backgroundColor: 'red',
width: '100px',
}, 3000, function() {
console.log('end');
});
}
}
jQuery liblaries:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<link rel="stylesheet" href="jquery-ui/jquery-ui.min.css">
<script src="jquery-ui/external/jquery/jquery.js"></script>
<script src="jquery-ui/jquery-ui.min.js"></script>
<!-- I tried also this -->
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
In JS function works well - logs in console are shown, width of element too is changing, but background color not and it do not show any errors in console.
Any suggestions?

jQuery cannot animate background colours by default. You have two options, first you could use a third party plugin. Secondly, you can use CSS. The latter is preferable. Here's how to do it by setting the transition CSS rule on the element and then just adding the class in your jQuery code.
input {
transition: all 3s;
}
input.error {
background-color: red;
}
function sendImage() {
var $formularz = $('form#sendImage');
var $autor = $formularz.children('input[name=autor]');
if ($autor.val().length < 1 || $autor.val().length > 20) {
$autor.addClass('error');
}
}
Working example

I am pretty sure in Javascript you need to indicate you are adding style to an element via its id. So if you set an element's Id to be autor it would work using the following in your if statement:
document.getElementById('autor').style.background-color="red";

Rory McCrossan, I tested your recommendations and 'backgroundColor' worked well, but later i wanted to check again the backgoundColor and it also works...
So I don't know what was wrong. Mayby some typo or I forgot about somethink.
Sorry for the confusion.

How to use tocify with asciidoctor for a dynamic toc?

By default, asciidoctor creates a static toc. This is very cool but for long documents, it would be nice to if the toc could be somewhat more compact and would highlight where in the document the reader currently is.
At this point, tocify comes in. Tocify is a nice Javascript solution exactly to cover this.
Now the question is: how to use tocify with asciidoctor?
Asciidoctor issue 699 is relevant here.

Enable docinfo processing in your asciidoc files, e.g. by passing the following options to asciidoctor:
-a toc=left -a docinfo=shared
Add a docinfo.html file next to your asciidoc files with the following content:
<!-- Generate a nice TOC -->
<script src="https://code.jquery.com/jquery-1.11.3.min.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.tocify/1.9.0/javascripts/jquery.tocify.min.js"></script>
<!-- We do not need the tocify CSS because the asciidoc CSS already provides most of what we neeed -->
<style>
.tocify-header {
font-style: italic;
}
.tocify-subheader {
font-style: normal;
font-size: 90%;
}
.tocify ul {
margin: 0;
}
.tocify-focus {
color: #7a2518;
background-color: rgba(0, 0, 0, 0.1);
}
.tocify-focus > a {
color: #7a2518;
}
</style>
<script type="text/javascript">
$(function () {
// Add a new container for the tocify toc into the existing toc so we can re-use its
// styling
$("#toc").append("<div id='generated-toc'></div>");
$("#generated-toc").tocify({
extendPage: true,
context: "#content",
highlightOnScroll: true,
hideEffect: "slideUp",
// Use the IDs that asciidoc already provides so that TOC links and intra-document
// links are the same. Anything else might confuse users when they create bookmarks.
hashGenerator: function(text, element) {
return $(element).attr("id");
},
// Smooth scrolling doesn't work properly if we use the asciidoc IDs
smoothScroll: false,
// Set to 'none' to use the tocify classes
theme: "none",
// Handle book (may contain h1) and article (only h2 deeper)
selectors: $( "#content" ).has( "h1" ).size() > 0 ? "h1,h2,h3,h4,h5" : "h2,h3,h4,h5",
ignoreSelector: ".discrete"
});
// Switch between static asciidoc toc and dynamic tocify toc based on browser size
// This is set to match the media selectors in the asciidoc CSS
// Without this, we keep the dynamic toc even if it is moved from the side to preamble
// position which will cause odd scrolling behavior
var handleTocOnResize = function() {
if ($(document).width() < 768) {
$("#generated-toc").hide();
$(".sectlevel0").show();
$(".sectlevel1").show();
}
else {
$("#generated-toc").show();
$(".sectlevel0").hide();
$(".sectlevel1").hide();
}
}
$(window).resize(handleTocOnResize);
handleTocOnResize();
});
</script>

jQuery: equivalent of .live() for CSS?

How do I add CSS to elements that have been dynamically created?
Here is a simple example of what I would like to do:
$(document).ready(function() {
$('#container').html('<p id="hello">hello world</p>');
// The following line doesn't work.
$('#hello').css("background-color", "#FFF");
});
The reason I want to do this, and I can't think of another way of doing it, is that I want to use background colour on alternate rows of a table that is dynamically generated:
$("#results-table tr:even").css("background-color", "#FFF");
I need to use this line of jQuery specifically for IE8 and below, which don't support nth-child CSS selectors.

Actually, your code does work. You might want to check if you don't have multiple elements by that ID.
Edit:
Here's your code, without duplicate IDs: http://jsfiddle.net/FhTU7/
Final edit:
Your HTML background and element background are both white.

You could instead of directly setting the CSS also just add a class to the even rows
$("#results-table tr:even").addClass("alt");
CSS to set the row colours and then a different set of colours for the alternate rows
<style type="text/css">
tr
{
background: #fff;
color: #000;
}
tr.alt
{
background: #000;
color: #fff;
}
</style>

You could declare the new element as a variable...
$(document).ready(function() {
var $new = $('<p id="hello">hello world</p>');
$new.css({
backgroundColor: "#fff"
})
$('#container').append($new);
});
You could use appendTo...
$(document).ready(function() {
$('<p id="hello">hello world</p>').appendTo('#container').css({
backgroundColor: "#fff"
})
});
However, if you create the elements correctly then you can use the original CSS at the end...
$('#container').append('<p id="hello">hello world</p>');

Dynamically changing less variables

I want to change a less variable on client side.
Say I have a less file
#color1: #123456;
#color2: #color1 + #111111;
.title { color: #color1; }
.text { color: #color2; }
I want that user yo pick a color and change the value of #color1 and recompile css without reloading the page.
Basically I'm looking for a js function, something like this
less_again({color1: '#ff0000'})

Marvin,
I wrote a function that does exactly what you're looking for, last night.
I have created a fork on Github;
https://github.com/hbi99/less.js/commit/6508fe89a6210ae3cd8fffb8e998334644e7dcdc
Take a look at it. Since this is a recent addition, I'd like to hear your comments on the addition. This solution fits my needs perfectly and I think it will do the same for you.
Here is a basic sample;
Sample LESS:
#bgColor: black;
#textColor: yellow;
body {background: #bgColor; color: #textColor;}
From JS:
less.modifyVars({
'#bgColor': 'blue',
'#textColor': 'red'
});

The creator of less.js added some features that should allow you to do something like this. Read the comments and the answers here: Load less.js rules dynamically

This less:
#color1: #123456;
#color2: #color1 + #111111;
.title { color: #color1; }
.text { color: #color2; }
compiles to this CSS and this is all the browser knows about:
.title { color: #123456; }
.text { color: #234567; }
So, now you're effectively saying you want to change dynamically to this:
.title { color: #ff0000; }
You can do that by reaching into the existing stylesheet with JS and changing the rule for .title. Or, you can define an alternate rule in your original CSS:
.alternate.title { color: #ff0000; }
And, find all the objects with .title and add .alternate to them. In jQuery, this would be as simple as:
$(".title").addClass(".alternate");
In plain JS, you'd need to use a shim to provide getElementsByClassName in a cross browser fashion and then use:
var list = document.getElementsByClassName("title");
for (var i = 0, len = list.length; i < len; i++) {
list[i].className += " alternate";
}

Wait cursor over entire html page

Is it possible to set the cursor to 'wait' on the entire html page in a simple way? The idea is to show the user that something is going on while an ajax call is being completed. The code below shows a simplified version of what I tried and also demonstrate the problems I run into:
if an element (#id1) has a cursor style set it will ignore the one set on body (obviously)
some elements have a default cursor style (a) and will not show the wait cursor on hover
the body element has a certain height depending on the content and if the page is short, the cursor will not show below the footer
The test:
<html>
<head>
<style type="text/css">
#id1 {
background-color: #06f;
cursor: pointer;
}
#id2 {
background-color: #f60;
}
</style>
</head>
<body>
<div id="id1">cursor: pointer</div>
<div id="id2">no cursor</div>
Do something
</body>
</html>
Later edit...
It worked in firefox and IE with:
div#mask { display: none; cursor: wait; z-index: 9999;
position: absolute; top: 0; left: 0; height: 100%;
width: 100%; background-color: #fff; opacity: 0; filter: alpha(opacity = 0);}
<a href="#" onclick="document.getElementById('mask').style.display = 'block'; return false">
Do something</a>
The problem with (or feature of) this solution is that it will prevent clicks because of the overlapping div (thanks Kibbee)
Later later edit...
A simpler solution from Dorward:
.wait, .wait * { cursor: wait !important; }
and then
Do something
This solution only shows the wait cursor but allows clicks.

If you use this slightly modified version of the CSS you posted from Dorward,
html.wait, html.wait * { cursor: wait !important; }
you can then add some really simple jQuery to work for all ajax calls:
$(document).ready(function () {
$(document).ajaxStart(function () { $("html").addClass("wait"); });
$(document).ajaxStop(function () { $("html").removeClass("wait"); });
});
or, for older jQuery versions (before 1.9):
$(document).ready(function () {
$("html").ajaxStart(function () { $(this).addClass("wait"); });
$("html").ajaxStop(function () { $(this).removeClass("wait"); });
});

I understand you may not have control over this, but you might instead go for a "masking" div that covers the entire body with a z-index higher than 1. The center part of the div could contain a loading message if you like.
Then, you can set the cursor to wait on the div and don't have to worry about links as they are "under" your masking div. Here's some example CSS for the "masking div":
body { height: 100%; }
div#mask { cursor: wait; z-index: 999; height: 100%; width: 100%; }

This seems to work in firefox
<style>
*{ cursor: inherit;}
body{ cursor: wait;}
</style>
The * part ensures that the cursor doesn't change when you hover over a link. Although links will still be clickable.

I have been struggling with this problem for hours today.
Basically everything was working just fine in FireFox but (of course) not in IE.
In IE the wait cursor was showing AFTER the time consuming function was executed.
I finally found the trick on this site:
http://www.codingforums.com/archive/index.php/t-37185.html
Code:
//...
document.body.style.cursor = 'wait';
setTimeout(this.SomeLongFunction, 1);
//setTimeout syntax when calling a function with parameters
//setTimeout(function() {MyClass.SomeLongFunction(someParam);}, 1);
//no () after function name this is a function ref not a function call
setTimeout(this.SetDefaultCursor, 1);
...
function SetDefaultCursor() {document.body.style.cursor = 'default';}
function SomeLongFunction(someParam) {...}
My code runs in a JavaScript class hence the this and MyClass (MyClass is a singleton).
I had the same problems when trying to display a div as described on this page. In IE it was showing after the function had been executed. So I guess this trick would solve that problem too.
Thanks a zillion time to glenngv the author of the post. You really made my day!!!

Easiest way I know is using JQuery like this:
$('*').css('cursor','wait');

css: .waiting * { cursor: 'wait' }
jQuery: $('body').toggleClass('waiting');

Why don't you just use one of those fancy loading graphics (eg: http://ajaxload.info/)? The waiting cursor is for the browser itself - so whenever it appears it has something to do with the browser and not with the page.

To set the cursor from JavaScript for the whole window, use:
document.documentElement.style.cursor = 'wait';
From CSS:
html { cursor: wait; }
Add further logic as needed.

Try the css:
html.waiting {
cursor: wait;
}
It seems that if the property body is used as apposed to html it doesn't show the wait cursor over the whole page. Furthermore if you use a css class you can easily control when it actually shows it.

Here is a more elaborate solution that does not require external CSS:
function changeCursor(elem, cursor, decendents) {
if (!elem) elem=$('body');
// remove all classes starting with changeCursor-
elem.removeClass (function (index, css) {
return (css.match (/(^|\s)changeCursor-\S+/g) || []).join(' ');
});
if (!cursor) return;
if (typeof decendents==='undefined' || decendents===null) decendents=true;
let cname;
if (decendents) {
cname='changeCursor-Dec-'+cursor;
if ($('style:contains("'+cname+'")').length < 1) $('<style>').text('.'+cname+' , .'+cname+' * { cursor: '+cursor+' !important; }').appendTo('head');
} else {
cname='changeCursor-'+cursor;
if ($('style:contains("'+cname+'")').length < 1) $('<style>').text('.'+cname+' { cursor: '+cursor+' !important; }').appendTo('head');
}
elem.addClass(cname);
}
with this you can do:
changeCursor(, 'wait'); // wait cursor on all decendents of body
changeCursor($('#id'), 'wait', false); // wait cursor on elem with id only
changeCursor(); // remove changed cursor from body

I used a adaptation of Eric Wendelin's solution. It will show a transparent, animated overlay wait-div over the whole body, the click will be blocked by the wait-div while visible:
css:
div#waitMask {
z-index: 999;
position: absolute;
top: 0;
right: 0;
height: 100%;
width: 100%;
cursor: wait;
background-color: #000;
opacity: 0;
transition-duration: 0.5s;
-webkit-transition-duration: 0.5s;
}
js:
// to show it
$("#waitMask").show();
$("#waitMask").css("opacity"); // must read it first
$("#waitMask").css("opacity", "0.8");
...
// to hide it
$("#waitMask").css("opacity", "0");
setTimeout(function() {
$("#waitMask").hide();
}, 500) // wait for animation to end
html:
<body>
<div id="waitMask" style="display:none;"> </div>
... rest of html ...

My Two pence:
Step 1:
Declare an array. This will be used to store the original cursors that were assigned:
var vArrOriginalCursors = new Array(2);
Step 2:
Implement the function cursorModifyEntirePage
function CursorModifyEntirePage(CursorType){
var elements = document.body.getElementsByTagName('*');
alert("These are the elements found:" + elements.length);
let lclCntr = 0;
vArrOriginalCursors.length = elements.length;
for(lclCntr = 0; lclCntr < elements.length; lclCntr++){
vArrOriginalCursors[lclCntr] = elements[lclCntr].style.cursor;
elements[lclCntr].style.cursor = CursorType;
}
}
What it does:
Gets all the elements on the page. Stores the original cursors assigned to them in the array declared in step 1. Modifies the cursors to the desired cursor as passed by parameter CursorType
Step 3:
Restore the cursors on the page
function CursorRestoreEntirePage(){
let lclCntr = 0;
var elements = document.body.getElementsByTagName('*');
for(lclCntr = 0; lclCntr < elements.length; lclCntr++){
elements[lclCntr].style.cursor = vArrOriginalCursors[lclCntr];
}
}
I have run this in an application and it works fine.
Only caveat is that I have not tested it when you are dynamically adding the elements.

BlockUI is the answer for everything. Give it a try.
http://www.malsup.com/jquery/block/

This pure JavaScript seems to work pretty well ... tested on FireFox, Chrome, and Edge browsers.
I'm not sure about the performance of this if you had an overabundance of elements on your page and a slow computer ... try it and see.
Set cursor for all elements to wait:
Object.values(document.querySelectorAll('*')).forEach(element => element.style.cursor = "wait");
Set cursor for all elements back to default:
Object.values(document.querySelectorAll('*')).forEach(element => element.style.cursor = "default");
An alternative (and perhaps a bit more readable) version would be to create a setCursor function as follows:
function setCursor(cursor)
{
var x = document.querySelectorAll("*");
for (var i = 0; i < x.length; i++)
{
x[i].style.cursor = cursor;
}
}
and then call
setCursor("wait");
and
setCursor("default");
to set the wait cursor and default cursor respectively.

Lots of good answers already, but none of them mentions the <dialog> element.
Using this element we can create a solution similar to the masking <div>.
Here we use showModal() to "hide" elements, and we use ::backdrop to set the cursor style to wait on the entire page:
function showWaitDialog() {
document.getElementById('id_dialog').showModal();
}
#id_dialog, #id_dialog::backdrop {
cursor: wait;
}
<button onclick="showWaitDialog()">click me</button>
<dialog id="id_dialog">busy...</dialog>
The dialog is hidden by default, and can be shown using either the show() method, or the showModal() method, which prevents clicking outside the dialog.
The dialog can be forced to close using the close() method, if necessary.
However, if your button links to another page, for example, then the dialog will disappear automatically as soon as the new page is loaded.
Note that the dialog can also be closed at any time by hitting the Esc key.
CSS can be used to style the dialog however you like.
The example uses the html onclick attribute, just for simplicity. Obviously, addEventListener() could also be used.

Late to the party but simply give the Html tag an id by targeting
document.documentElement
and in the CSS place at the top
html#wait * {
cursor: wait !important;
}
and simply remove it when you want to stop this cursor.