Develop Reference

Change element css styling with js or jquery on the fly

I want to be able to change my navbar position on the fly adjusting remaining content accordingly.
So, I have a functiona website. There is a menu navbar on top by default. What I did is added an 'edit' button to that menu so that when you click it, you get a list of 4 checkboxes with the ability to choose if you want that menu positioned on top (default), left, right or bottom with the other content moving accordingly (e.g menu on the left, content goes slightly right, etc). So basically, I have something like this:
// css for menu positioning to the left
.navbar-left {
width: 25%;
height: auto;
}
.content-right {
position: relative;
left: 200px;
}
// css for menu positioning to the bottom
.navbar-bottom {
position: relative;
bottom: 0;
left: 0;
height: 200px;
}
.content-up {
position: relative;
bottom: 200px;
}
And in JS I do something like this
if($("#left"):checked){
$("#menu-bar").addClass("navbar-left");
$("#content").addClass("content-right");
} else if ($("#bottom"):checked){
$("#menu-bar").addClass("navbar-bottom");
$("#content").addClass("content-up");
}
Now, I have much more styling than this, but it is irrelevant to the issue at hand. The problem is when I choose 'left' it styles properly but when I change it to 'bottom' after that it still uses the styles from 'left' positioning and adds the new ones to it.
Right now I solved the issue by removing the previous classes with .removeClass() method, like that:
if($("#left"):checked){
$("#menu-bar").removeClass("navbar-bottom navbar-right").addClass("navbar-left");
$("#content").removeClass("content-up content-down").addClass("content-right");
} else if ($("#bottom"):checked){
$("#menu-bar").removeClass("navbar-right").addClass("navbar-bottom");
$("#content").removeClass("content-down").addClass("content-up");
}
Basically, right now I have about a hundred lines of just adding classes of the chosen positioning while removing all the classes of 3 other choices that I added each time.
So, finally the question: Is there any other way to strip all the classes that were used before (just set everything to initial values like when the page was loaded) instead of deleting all these classes by hand?

I haven't ever tried resetting the classes to their initial state, but you can certainly clear them all off of a single element in one line of code:
To replace all existing classes with another class, we can use .attr( "class", "newClass" ) instead.
source: https://api.jquery.com/removeclass/
You could probably combine that with the .toggleClass or another method.
If I had to sit down and do it right now, based on my understanding of your question I'd just hide the original elements and add new elements with the classes that you'd like, then to revert delete the new elements and restore the original one.

Animating divs in a set

I currently have a list of objects (projects) that are presented to the user initially as div's that have have a 100px x 200px height/width, position absolute, and float left. This list is contained within an angular ng-repeat method (not sure that makes a difference in the overall question but figured I'd add it in just in case it does). There could be 100s of these divs on the particular project listing page. Currently, I have the page setup so that if you click one of the projects, it's details come up in a modal dialog box. This functionality is fine per the requirements for my project but I'd like to add some "umph" to it by adding in an animation that does the following:
1) If you click on one of the projects, the box expands up to fill the parent container that contains all the projects
2) As the div grows to fill the space or when it's full sized, I want to expose the details of the project itself. Essentially, when the project is unselected, it's just a title/description showing. When it is selected, the project div goes full screen, exposes all of it's details, and shows it's editable fields in the full screen version of the div.
3) When the user closes that full screen div, I'd like it to go back to it's original state in it's original position.
I'm only using the latest version of Chrome for this project so it doesn't need to be a cross browser solution. I'd prefer to keep the animation as close to pure css as possible and would prefer to leave jquery out of it.
I currently have no experience with css3 animations but got a book on it that I hope can teach me about this eventually. However, I figured I would ask in the mean time in case someone can help me out soon so I can put this functionality in while still meeting my deadline for the functionality.
Thanks in advance!

Create a second CSS class that can be added to your div element when it is selected, and removed when it is not. Something like
div {
top: 100px;
bottom: 200px;
left: 100px;
right: 300px;
transition: all 1s; /* animate changes */
}
.active {
top: 0px;
bottom:0px;
left: 0px;
right: 0px;
}
.content {
display: none; /* hide the content unless active */
}
.active .content {
display: block; /* show the content when .active class is added */
}
Make sure that the parent container fills the entire window and is itself set to positiion: absolute or position: relative. There will be a lot more details to work out as you go, but that should give you a framework to get started. You can then add or remove the .active class as needed with JavaScript.

Filmstrip Style Image Gallery

I am trying to figure out how to create an image gallery like the one illustrated below so I can place it onto my website. I am wondering if anyone can point me in the right direction for a tutorial? I have found a lot of nice galleries that will display my images, but none of them displays the images like in the filmstrip style I am after.
Requirements of gallery:
When clicking on the arrows, the gallery strip will either shift
left/right by one picture
Hovering over the image will darken the image, and display some
caption about the image

I just answered a question where someone was using carouFredSel. This jQuery plugin looks like it would work pretty well, though I do not think it has the built-in hover effect. To be honest though, that is the easier part.
The trick is to make the width slightly larger than the images to show, which leads to the partial images on each side.
Here is a jsfiddle to illustrate.
UPDATE:
The OP asked if the page nav links could be repositioned. I modified the jsfiddle to work this way. The additions were as follows:
.list_carousel {
position: relative;
}
#prev2 {
position: absolute;
top: 35px;
left: 0;
}
#next2 {
position: absolute;
top: 35px;
right: 0;
}
If you have a relatively positioned container element, you can absolutely position child elements. I added relative positioning to the list_carousel container, then I could absolutely position the nav arrows within the container. Change the top value to position vertically, and left/right to position horizontally.
I also removed the pager all together, as it was not a requirement based on the original example. If you change the page arrows to images it is pretty much what you want.
MORE UPDATES
I decided to take it one step further and make the hover effect work more like the example. See the new jsfiddle. The changes are:
Added span wrappers around all text within list items
Added $(".list_carousel li span").hide(); to hide all the spans
Modified hover event to toggle spans
I also added some CSS to position the span text:
.list_carousel li {
position: relative;
}
.list_carousel li span {
position: absolute;
bottom: 0;
display: block;
text-align: center;
width: 100%;
}
FINAL UPDATE (I PROMISE!)
I decided to go all in and add the transparency layer too: jsfiddle
Hover modifications:
$(this).prepend($("<div class='hover-transparency'></div>")); and $(this).find("div:first").remove(); to add/remove transparency layer on hover in/out.
CSS modifications:
.hover-transparency {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: rgba(0, 0, 0, 0.60);
}
These style the transparency layer. Change to suit your taste.

Something like jCarousel should do the trick. Once you have the carousel functionality in place, you can add in the hover affect via CSS and a span that contains the caption.

I was just looking at ContentFlow Plugin which is JavaScript based.
They include a separate library of additional plugin you can use that takes care of your Slideshow requirements, in particularity this one HERE. When you use the mousewheel over the 3 images, it scrolls by 1. That said, you can mod the plugin to do the same when the arrow buttons are clicked.
Sample plugin markup looks like:
{
shownItems: 3, //number of visible items
showCaption: true // show item caption
width: 100, // relative item width
height: 100, // relative item height
space: 0.4 // relative item spacing
}
To address that the captions should be visible only on mouse hover, I would set showCaption to always be true along with using a jQuery .hover(); Event Listener that will use .show(); and .hide(); on the caption Class Name .caption when required. Also, using jQuery to set the opacity can be done within the .hover(); event too.
The latest version of ContentFlow v1.0.2 supports multiple instances on the same webpage if that's ever required.

positioning of sub menus in jquery menu combined with stumbleupon toolbar goes wrong

Script Title: dropline menu
Script URL: http://www.dynamicdrive.com/style/cs...rop_line_menu/
I got the menu working just fine, however, I discovered that when I have the stumble upon toolbar on, the submenu suddenly is placed about 22px lower than it should be. Sometimes this increases to multiple times that difference. You can test out this behavior for yourself in Chrome browser, having the stumbleupon toolbar enabled and hovering over one of the menu items which has a submenu: http://kwestievan.nl/unityexpress/
How can I fix this? I checked if body.offset().top was the problem, but actually that one is higher than the difference: 32px, while the difference in the menu is only 22px.

The reason the sub menu is lower beacuse the element
<ul class="sub-menu"</ul>
is being given a style of
position: absolute;
left: 233px;
top: 224px;
What this does is place the sub-menu "RELATIVE" to the browser window as such that it is 223px from the left and 224px from the top of the "browser window". This works fine when there is no "stumbleupon" toolbar. However when you do add the stumbleupon toolbar, it adds the toolbar in the form of a iframe element. The height of the iframe element than causes the sub-menu to be pushed down since the dimensions of the browser window have changed.
You can quickly test this by finding out the height of the "stumbleupon" toolbar and than comparing that height to the amount of distance the sub-menu has pushed down on you monitor/screen resolution. They will be same.
The solution is to give the element
<li id="menu-item-1738"</li>
a style of
position: relative;
and than style the sub-menu so that it aligns and is "absolutely" positioned "RELATIVE" to the containing li element. For example
position: absolute;
top: 20px;
left: 15px;
Offcourse all this is being done by your script. I am not sure why are you using javascript for this. This can be easily acheived by CSS alone.

How to get page 's scroll position change event in JS?

How to get page 's scroll position change event?
I want to implement dynamic table of contents like http://bonsaiden.github.com/JavaScript-Garden/ ( In this website, with your scrolling of the webpage, It also shows the current active item)
Is it possible to implement same thing without getting current scroll-position?
I am very new to JS and web-world.

That page does use some JS trickery with its <nav> element, but it's fixing the location of the sidebar using position: fixed, that is, using CSS not JavaScript. Here's the relevant style declaration (comments mine):
nav {
position: fixed; // fix position
margin-left: 750px; // add 750 px of room to the left
top: 0; // set 0px from top of page
}