jQuery hover and class selector - javascript

I wan't to change the background color of a div dynamicly using the following HTML, CSS and javascript.
HTML:
<div id="menu">
<div class="menuItem"><a href=#>Bla</a></div>
<div class="menuItem"><a href=#>Bla</a></div>
<div class="menuItem"><a href=#>Bla</a></div>
</div>
CSS:
.menuItem{
display:inline;
height:30px;
width:100px;
background-color:#000;
}
Javascript:
$('.menuItem').hover( function(){
$(this).css('background-color', '#F00');
},
function(){
$(this).css('background-color', '#000');
});
EDIT: I forgot to say that I had reasons not to want to use the css way.
And I indeed forgot to check if the DOM was loaded.

Your code looks fine to me.
Make sure the DOM is ready before your javascript is executed by using jQuery's $(callback) function:
$(function() {
$('.menuItem').hover( function(){
$(this).css('background-color', '#F00');
},
function(){
$(this).css('background-color', '#000');
});
});

I would suggest not to use JavaScript for this kind of simple interaction. CSS is capable of doing it (even in Internet Explorer 6) and it will be much more responsive than doing it with JavaScript.
You can use the ":hover" CSS pseudo-class but in order to make it work with Internet Explorer 6, you must use it on an "a" element.
.menuItem
{
display: inline;
background-color: #000;
/* width and height should not work on inline elements */
/* if this works, your browser is doing the rendering */
/* in quirks mode which will not be compatible with */
/* other browsers - but this will not work on touch mobile devices like android */
}
.menuItem a:hover
{
background-color:#F00;
}

This can be achieved in CSS using the :hover pseudo-class. (:hover doesn't work on <div>s in IE6)
HTML:
<div id="menu">
<a class="menuItem" href=#>Bla</a>
<a class="menuItem" href=#>Bla</a>
<a class="menuItem" href=#>Bla</a>
</div>
CSS:
.menuItem{
height:30px;
width:100px;
background-color:#000;
}
.menuItem:hover {
background-color:#F00;
}

test.html
<?xml version="1.0" encoding="UTF-8"?>
<!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" xml:lang="en">
<head>
<title>jQuery Test</title>
<link rel="stylesheet" type="text/css" href="test.css" />
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="test.js"></script>
</head>
<body>
<div id="menu">
<div class="menuItem"><a href=#>Bla</a></div>
<div class="menuItem"><a href=#>Bla</a></div>
<div class="menuItem"><a href=#>Bla</a></div>
</div>
</body>
</html>
test.css
.menuItem
{
display: inline;
height: 30px;
width: 100px;
background-color: #000;
}
test.js
$( function(){
$('.menuItem').hover( function(){
$(this).css('background-color', '#F00');
},
function(){
$(this).css('background-color', '#000');
});
});
Works :-)

Since this is a menu, might as well take it to the next level, and clean up the HTML, and make it more semantic by using a list element:
HTML:
<ul id="menu">
<li>Bla</li>
<li>Bla</li>
<li>Bla</li>
</ul>
CSS:
#menu {
margin: 0;
}
#menu li {
float: left;
list-style: none;
margin: 0;
}
#menu li a {
display: block;
line-height:30px;
width:100px;
background-color:#000;
}
#menu li a:hover {
background-color:#F00;
}

On a side note this is more efficient:
$(".menuItem").hover(function(){
this.style.backgroundColor = "#F00";
}, function() {
this.style.backgroundColor = "#000";
});

I prefer foxy's answer because we should never use javascript when existing css properties are made for the job.
Don't forget to add display: block ; in .menuItem, so height and width are taken into account.
edit : for better script/look&feel decoupling, if you ever need to change style through jQuery I'd define an additional css class and use $(...).addClass("myclass") and $(...).removeClass("myclass")

If someone reads the original question to mean that they want to dynamically change the hover css and not just change the base css rule for the element, I've found this to work:
I have a dynamically loaded page that requires me to find out how high the container becomes after data is loaded. Once loaded, I want to change the hover effect of the css so that an element covers the resulting container. I need to change the css .daymark:hover rule to have a new height. This is how...
function changeAttr(attrName,changeThis,toThis){
var mysheet=document.styleSheets[1], targetrule;
var myrules=mysheet.cssRules? mysheet.cssRules: mysheet.rules;
for (i=0; i<myrules.length; i++){
if(myrules[i].selectorText.toLowerCase()==".daymark:hover"){ //find "a:hover" rule
targetrule=myrules[i];
break;
}
}
switch(changeThis)
{
case "height":
targetrule.style.height=toThis+"px";
break;
case "width":
targetrule.style.width=toThis+"px";
break;
}
}

I just coded up an example in jQuery on how to create div overlays over radio buttons to create a compact, interactive but simple color selector plug-in for jQuery
http://blarnee.com/wp/jquery-colour-selector-plug-in-with-support-for-graceful-degradation/

Always keep things easy and simple by creating a class
.bcolor{ background:#F00; }
THEN USE THE addClass() & removeClass() to finish it up

Related

How do I make <a> tags with a class unclickable?

I have some parent nav items with children and I don't need the parent items to be clickable.
They look like this:
Parent Item
Is there anyway to target the <a> tags with the specific class of .parent and make them unclickable?
If anyone interested in Pure CSS solution (As this question is tagged as CSS) than you can use pointer-events: none;
a[href="parent"] {
cursor: default;
pointer-events: none;
}
Demo
As far as support goes
Credits: Mozilla Developer Network
Use:
$(function () {
$('a.parent').on("click", function (e) {
e.preventDefault();
});
});
If you want to avoid using the jQuery library, it's just as easy without it:
var disabled = document.querySelector('.parent');
disabled.addEventListener('click', function(e) {e.preventDefault();}, false);
Another pure CSS option would be to overlay the link with an absolutely positioned "cover":
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style media="all">
.parent {position: relative; z-index: -1;}
.parent:after {content: ""; position: absolute; top:0; right: 0; bottom: 0; left: 0;}
</style>
</head>
<body>
Disabled Link
Normal Link
</body>
</html>
Instead of a listener on every .parent, you can put a single listener on the body. The following will work in every browser in use without any library support:
function stopClickOnParentClass(evt) {
var el = evt.target || evt.srcElement;
if (/(^|\s)parent(\s|$)/.test(el.className)) {
evt.preventDefault();
return false;
}
}
then:
<body onclick="stopClickOnParent(event);" …>
You could also make the class dynamic by passing it to the function and building the regular expression from it.

addClass() function not being applied to an ID

<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>Working With DOM</title>
<script src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function()
{
$("#gold").addClass("highlight");
});
</script>
<style type="text/css">
body{background-color:#FFCC66;}
#wrap
{margin:0 auto;
border:2px solid #CC8320;
height:500px;}
h1{font-style:italic;
color:#A48713; padding-left:10px;}
#gold{width:200px;
background-color:#D49F55;
height:150px; margin:20px; float:left;height:200px}
input{border:1px solid black; width:150px; margin:0 20px;
background-color:#AA9F55; color:#553F00;font-weight:bolder;text-align:center; }
.info{border:1px solid black; width:150px;background-color:#AA9F55; color:#553F00;font-weight:bolder;text-align:center;margin:0 20px; }
.highlight{background-color:green;}
</style>
</head>
<body>
<div id="wrap">
<h1> Learning Web Engineering Online</h1>
<div data-price="399.99" id="gold">
<h3>Gold Member</h3>
<ul class="course">
<li>HTML5</li>
<li>css3</li>
<li>jquery</li>
</ul>
<form>
<input type="button" value="GET PRICE"/>
</form>
</div>
</div>
</body>
I am having problem with the code above that when using jquery i add class highlight to element with id=gold and inspect it in chrome, although the class is being added to the code the style rule mentioned in highlight class doesn't output in browser. the element is being selected but not styled. what am i doing wrong please help someone.
You should use !important to work it:
.highlight{background-color:green !important;}
Note:
Browser uses ID with higher importance than a class name.
change your css to
#gold.highlight{background-color:green;}
You need to change the priority style for .highlight. Just add #gold before the .highlight style
#gold.highlight{background-color:green;}
The problem here is due to the precendence of CSS selectors. An id selector will override a class selector, so you need to either make the class selector more specific (preferred method):
#gold.highlight { background-color: green; }
Example fiddle
Or aleternatively add !important to it:
.highlight { background-color: green !important; }
However the latter can lead to issues when you have competing !important rules, so it's best to avoid it where possible.
highlight gets applied but as there is background-color property defined in ID it will not be overridden by class value.
As mentioned by #cocco you can use #gold.highlight to override it.
Id has greater precision due to conflict resolution, class css is overridden by your #gold id css
change your class
.highlight{background-color:green !important;}

Issue with jQuery : Click event & Switching between "active" elements

OK, here's my issue and I bet it'll be super-easy for you (I guess it wasn't... lol).
So, let's say I'm having several divs. Once the user clicks on one of them, I want to highlight just this one. In a few words : a) remove (if exists) a specific class from all divs, b) add it to the div being clicked.
And here's the full code...
index.html
<!DOCTYPE html>
<html style='min-height:0px;'>
<head>
<title>Page Title</title>
<meta name="viewport" content="width=device-width, height=device-height, initial-scale=1">
<link rel="stylesheet" href="jquery.mobile.min.css" />
<link rel="stylesheet" href="custom.css" />
<script src="jquery.min.js"></script>
<script src="jquery.mobile.min.js"></script>
</head>
<body>
<div data-role="page">
</div>
<script src="custom.js"></script>
</body>
</html>
custom.js
$(function() {
$("div").click( function() {
$("div").removeClass("msp-selected");
$(this).addClass("msp-selected");
});
});
custom.css
media screen and (orientation: portrait) {
.ui-mobile, .ui-mobile .ui-page {
min-height: 420px;
}
}
media screen and (orientation: landscape) {
.ui-mobile, .ui-mobile .ui-page {
min-height: 300px;
}
}
div {
outline:0;
}
div:hover {
outline-width:1px;
outline-color:red;
outline-style: dotted;
overflow:hidden;
}
.msp-selected {
outline-width:1px;
outline-color:red;
outline-style: solid;
}
P.S.
The situation may not be as simple as it initially seemed. I'm using jQuery 1.8.2 and jQuery Mobile 1.3.2. And the actual page is running inside a Webview, itself inside a Cocoa/OS X app. Quite complicated, huh? lol
I can't see any error (not easy to have access to a console that... doesn't exist...). The only thing that I noticed is that when I remove the removeClass part, it does work. Adding it, seems to make the whole thing a mess.
$(function() {
$('div').on( "click", function() {
$(this).addClass('msp-selected');
$(this).siblings().removeClass('msp-selected');
})
Try something like:
$(".box").click( function() {
if($(".activeBox").length > 0) { //check if there is an activeBox element
$(".activeBox").removeClass("activeBox"); //if there is, remove it
}
$(this).addClass("activeBox"); //make the clicked div the activeBox
});
.box and .activeBox classes to be replaced by your own inactive and active selectors as you want.
Here's a jsFiddle example
Update:
With the new HTML, I got this working as a jsFiddle
Here's the code:
HTML within jsFiddle's existing head/body tags:
<div data-role="page">
</div>
CSS from OP:
div {
outline:0;
}
div:hover {
outline-width:1px;
outline-color:red;
outline-style: dotted;
overflow:hidden;
}
.msp-selected {
outline-width:1px;
outline-color:red;
outline-style: solid;
}
jQuery:
$("div").click( function() {
if($(".msp-selected").length > 0) {
$(".msp-selected").removeClass("msp-selected");
}
$(this).addClass("msp-selected");
});
I tested this with the various versions of jQuery available back to 1.7.2 and mobile 1.1.1, with the class being added on click each time. My only suggestion if this still doesn't work is to encase the whole thing in $(document).ready( function() { //click function }); or switch to $("div").on("click", function() {});

Change background image of anchor <a> tag after expanding it + CSS

So, What basically I am trying is after clicking on <a> anchor tag I want to change the background of it.
Example : See image below
After clicking on this link I am generating (expanding) one div tag exactly below to it and displaying the polices on it.
I want to expand arrow turn when expanding/collapsing like :
See Image below: Image Name: (black_t_arrow.gif)
So that It will display image down arrow image when policies link is collapsed and again vice versa after clicking on Policies link it should hide that down arrow image with original one means it should return to the previous state.
Following is my CSS code:
.expended_div{ float:left; width:100%; padding:10px 0}
.expended_div a{ color:#000; font-size:11px; text-decoration:underline; margin-left:15px; font-weight: bold; background-image: url("/common/images/black_t_arrow.gif");
background-position: 0 2px;
background-repeat: no-repeat; padding-left: 9px;}
.expended_div a:hover{ text-decoration:underline}
.expand_collapse{ float:left; padding:10px 20px; }
Following is HTML code:
<p class="expended_div open">Policies</p>
<div class="expand_collapse" style="display:none;">
<p><?php
//some php code
}
?></p>
</div>
How can I achieve this using CSS?
Thanks in advance.
You need two CSS classes, one for the collapse and one for the expanded.
HTML:
<a id="expander" class="close" href="#">Click to collapse/expand</a>
CSS:
.close { background-image: url("/images/collapsed.gif"); }
.open { background-image: url("/images/expanded.gif"); }
JavaScript:
/* Useful for multiple CSS classes. */
$('a#expander').click(function(e){
e.preventDefault();
var exp = $(this);
if (exp.hasClass('open')) {
exp.removeClass('open').addClass('close');
} else {
exp.removeClass('close').addClass('open');
}
});
OR:
CSS:
a#expander { background-image: url("/images/collapsed.gif"); } /* set default image */
.open { background-images: url("/images/expanded.gif"); }
JavaScript:
/* Swap in/out the class open to override the default background. */
$('a#expander').toggleClass('open');
I assume you have a javascript onclick (or similar) to toggle the style for the menu item to expand it. If you have an ID on the menu items then in the JS that's triggered I would use a test for open/close status and over-ride or reset the CSS items as needed
document.getElementById("menuItem").style.backgroundImage = "url(black_t_arrow.gif)";
This seems like a job for CSS sprites, as laid out here. My jsFiddle for the solution is here.
The basic idea is to create a single image that contains both arrows. Since you're using this image as a background, only the part of the image that fills up your <a> tag content will display. To change between one image and the other, all you need to do is change the css background-position property.
Inside your DOM-ready function:
$(".expended_div a").on("click", function() {
if(this.css("background-position") == "0px -8px")
this.css("background-position", "0px -31px");
else
this.css("background-position", "0px -8px");
});
For this to work, change "black_t_arrow.gif" to look like this:
The cool thing about this is that there's no loading time for the second image. It's already there, but hidden from view because the background image is larger than the content area.
I don't know about css but if you are using the jquery ui framework then following link will help you
http://jqueryui.com/accordion/
u will have to use following property
$( "#accordion" ).accordion({ collapsible: true });
try following Code:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>jQuery UI Accordion - Default functionality</title>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.0/themes/base/jquery-ui.css" />
<script src="http://code.jquery.com/jquery-1.8.3.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.7/jquery-ui.min.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css" />
<script>
$(function() {
$( "#accordion" ).accordion({ collapsible: true });
});
</script>
</head>
<body>
<div id="accordion">
<h3>Section 1</h3>
<div>
<p>Welcome</p>
</div>
<h3>Section 2</h3>
<div>
<p>Hi</p>
</div>
<h3>Section 3</h3>
<div>
<p>Hello</p>
</div>
<h3>Section 4</h3>
<div>
<p>How are you?</p>
<p>Have a nice day.</p>
</div>
</div>
</body>
</html>
Aslo check the documentation for the 'Accordian' at http://api.jqueryui.com/accordion/

Change image on mouseover for a button on another div

On the "home" page I want to have a logotype and a menu on a #banner div (which will then be there throughout the whole site) and on a #content" div to have an image. All these divs are inside a #container" div. The menu has 3 buttons.
I would like that on mouseover event each button displayed image on the #content div changes accordingly. So basically, when hover button1, the image on #content will change from background.jpg to background1.jpg. The event of mouseover on button2 will change it to background2.jpg etc. When buttons are not hovered over, the image should revert to the original background.jpg.
HTML:
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>E.S.T.</title>
<link href="_css/layout.css" rel="stylesheet" type="text/css">
<link href="SpryAssets/SpryMenuBarHorizontal.css"
rel="stylesheet"
type="text/css">
<script src="SpryAssets/SpryMenuBar.js" type="text/javascript"></script>
</head>
<body>
<div id="container">
<div id="banner">
<div id="logo">E.S.T.</div>
<div id="menu">
<ul id="MenuBar1" class="MenuBarHorizontal">
<li id="button1">Biography</li>
<li id="button2">Albums</li>
<li id="button3">Links</li>
</ul>
</div>
</div>
<div id="content">
<img id="back0" src="_img/background.jpg">
<img id="back1" src="_img/back_bio.jpg">
</div>
</div>
<script type="text/javascript">
var MenuBar1 = new Spry.Widget.MenuBar("MenuBar1,
{
imgDown:"SpryAssets/SpryMenuBarDownHover.gif",
imgRight:"SpryAssets/SpryMenuBarRightHover.gif"
});
</script>
</body>
</html>
CSS:
#charset "UTF-8";
#import url("../_fonts/Days/fontstylesheet.css");
body {
background-color:#CCC;
font-family:Days;
font-size:100%;
}
#container {
width:850px;
max-height: 650px;
margin: 0 auto;
padding-left: 10px;
padding-right: 10px;
overflow: hidden;
font-family: Days;
}
#logo {
position:relative;
font-size: 4em;
color:white;
float:left;
}
#menu {
float:right;
margin-top:40px;
}
I have tried several different things but I manage only to change the background image from the buttons themselves. From searching around the web i think this should be done with JS, but i have no idea how to do it.
This can be solved entirely with CSS, but first let me give you a tip:
Combine background.jpg and background1.jpg into one image, and rather change the background position. This way, there won't be any delay from when the user hovers over the menu element to when the picture is displayed, and you'll have fewer files to keep track of.
Say we let #button1 be 100px tall. We make an image 200px tall containing the normal state image on top, and the hover image on the bottom. This is called a sprite.
#button1 {
height: 100px;
background-image: url("background.jpg");
}
#button1:hover {
background-position: 0 -100px;
}
This moves the background image, showing the hover version.
For convenience, I'll answer this question using the jQuery javascript library.
If I understand you right, you would like #content to contain an image that changes when you hover over the menu items, and the image should reflect the item currently hovered.
In stead of including every image in the body, I'll try an approach using the data attributes.
HTML The relevant parts
<ul id="MenuBar1" class="MenuBarHorizontal">
<li id="button1" data-img="background.jpg">Biography</li>
<li id="button2" data-img="back_album.jpg">Albums</li>
<li id="button3">Links</li>
</ul>
<div id="content">
<img id="back"
src="_img/background.jpg"
data-original="_img/background.jpg"
alt="e.s.t" />
</div>
JavaScript
$(document).ready(function() {
$("#MenuBar1 li").mouseover(function() {
$("#back").attr("src", $(this).data("img"));
}).mouseout(function() {
$("#back").attr("src", $("#back").data("original"));
});
});​
So now we store the original image path with the image tag in its data-original attribute, and the path to the :hover image is stored with the menu element.
See this Fiddle for a demo!
Give an id on your image like: id=idimage
You can use jQuery like this:
<script type="text/javascript">
$(document).ready(function(){
$("#MenuBar1 li").mouseover(function(){
var id=$(this).attr('id');
var number = id[id.length-1];
$("#id_image").attr("src","_img/background"+number+".jpg");
});
});
</script>

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