Develop Reference

How would I make my Bootstrap navbar "collapse"?

I am trying to replicate the scrolling effect from here: http://www.altisliferpg.com/
I have a feeling that they are using a heavily modified version of Bootstrap Navbar, which I have taken from here: http://www.enjin.com/forums/page/1/m/10826/viewthread/8514993-boot-strap-30-navbar-full-module and have changed it to fit into my specific case.
How would I make it so when you scroll down the page, the bar on the top gets "smaller" and scrolls along with the page as you scroll? Thanks

You can use css transitions for the height, font size and whatever else you want changed. Then simply set a scroll listener, which adds a class to the header so the size changes. Quick (and very ugly) example. jsFiddle
$(window).scroll(function () {
if ($(this).scrollTop()) {
$('#header').addClass('small');
}
else {
$('#header').removeClass('small');
}
});

Maybe you should detect the scroll event of the window, after that, set the position of the navbar to fixed and then, perform the animation. Here's an example of the javascript part and a link see it in action:
$(function(){
var performingDownAnimation = false,
performingUpAnimation = false;
var performScroll = function(){
if($("body").scrollTop() > 0) {
if(performingUpAnimation) {
$('#logo').stop();
performingUpAnimation = false;
}
if(!performingDownAnimation){
$('#navbar').addClass('navbar-fixed');
$('#logo').animate({ 'font-size': "12px" }, 1000, function(){
performingDownAnimation = false;
});
performingDownAnimation = true;
}
}else if($("body").scrollTop() == 0){
if(performingDownAnimation) {
$('#logo').stop();
performingDownAnimation = false;
}
if(!performingUpAnimation){
$('#navbar').removeClass('navbar-fixed');
$('#logo').animate({ 'font-size': "48px" }, 1000, function(){
performingUpAnimation = false;
});
performingUpAnimation = true;
}
}
}
$(document).on('scroll', performScroll);
});
On scroll event and position fixed
I edited my response for adding support for the "up" direction too. About using bootstrap for the animation, I have no idea how to do it, and I think it can't be done, because bootstrap is based mainly on applying CSS classes to different elements. CSS classes are discrete, but you are asking for animating something numerical, as the font-size property is. As much, you could create an animation that looks "staggered".

Remove class if other class present at scroll height

I need to hide an element on scroll - but only if its not already hidden.
I've written the following jQuery but it's not working for some reason - any tips please?
The css class open-style-switcher and close-style-switcher determine a css scroll anim. I want to wait until the page has scrolled to a certain height, then auto hide the search box if it contains the open class.
Where am I going wrong!?
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 500) {
$('#search-box').hasClass('open-style-switcher').toggleClass("open-style-switcher", "close-style-switcher", 1000);
}
});

"toggleClass" can receive two classes separated by space
Also creating "$searchBox" variable to avoid double search in DOM.
And as was told before: hasClass() returns boolean
Here it is:
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 500) {
var $searchBox = $('#search-box');
if ($searchBox.hasClass('open-style-switcher'))
{
$searchBox.toggleClass("open-style-switcher close-style-switcher", 1000);
}
}
});

.hasClass() - Returns: Boolean determines whether any of the matched elements are assigned the given class.
In your scenario, addClass and removeClass is more suitable.
See below :
$(window).scroll(function() {
var scroll = $(window).scrollTop();
var searchbox = $('#search-box');
if (scroll >= 500 && searchbox.hasClass('open-style-switcher')) {
searchbox.removeClass("open-style-switcher");
searchbox.addClass("close-style-switcher", 1000);
}
});

toggleClass() does not work in the way you, or even the other answers, think it does. It only adds and removes classes, not exchange them for others. See toggleClass() documentation here.
if (scroll >= 500) {
if($('#search-box').hasClass('open-style-switcher'))
{
$('#search-box').removeClass("open-style-switcher");
$('#search-box').addClass("close-style-switcher");
}
}
I imagine you will also want an else block that does the inverse of this. Perhaps the below is a more straight forward way of doing what you want to achieve as there may not be any point in the check to see if the #search-box already has the open-style-switcher class.
if (scroll >= 500) {
$('#search-box').removeClass("open-style-switcher").addClass("close-style-switcher");
}
else
{
$('#search-box').removeClass("close-style-switcher").addClass("open-style-switcher");
}

Change color Navigation Div when it passed from specific div

I want to change the color from white to black and/or black to white of my navbar-toggle.
But the problem is when it reach a sepecific div with a specific class like 'white' or 'black' the color changes when the scroll begins.
var stickyOffset = $(".navbar-toggle").offset();
var $contentDivs = $("section");
$(document).scroll(function() {
$contentDivs.each(function(k) {
var _thisOffset = $(this).offset();
var _actPosition = _thisOffset.top - $(window).scrollTop();
if (_actPosition < (stickyOffset.top + $('.navbar-toggle').height()/2) && _actPosition + $(this).height() - $('.navbar-toggle').height()/2 > 0) {
$(".bar1, .bar2, .bar3, .navbar-span").removeClass("white black").addClass($(this).hasClass("white") ? "white" : "black");
}
});
});
Now my jsfiddle but it changes very fast and I don't know what i'm doing wrong.
http://jsfiddle.net/xarlyblack/8mn4bucw/
Thank you in advance!
Best,
Carl

I dont know if I understand correctly your problem, but it seems to me that you have a logic error with your color label assignment, I think it should be like this:
...
if (_actPosition < (stickyOffset.top + $('.navbar-toggle').height()/2) &&
_actPosition + $(this).height() - $('.navbar-toggle').height()/2 > 0) {
$(".bar1, .bar2, .bar3, .navbar-span").removeClass("white black")
.addClass($(this).hasClass("white") ? "black" : "white");
}
...
And here is an updated jsfiddle in which I think it is properly working

As others have already pointed out, in your jsfiddle the two classes should be switched, but if i understand you correctly, on initial page load the classes also do not match if you, for example already scrolled down and make a page reload/refresh or you come from a anchor link.
To fix this i would suggest you also run the class-switch after document load like this:
var stickyOffset = $(".navbar-toggle").offset();
var $contentDivs = $("section");
$(document).scroll(function() {
checkcolor();
});
$(document).ready(function() {
checkcolor();
});
function checkcolor()
{
$contentDivs.each(function(k) {
var _thisOffset = $(this).offset();
var _actPosition = _thisOffset.top - $(window).scrollTop();
if (_actPosition < (30 + $('.navbar-toggle').height()/2) && _actPosition + $(this).height() - $('.navbar-toggle').height()/2 > 0) {
$(".bar1, .bar2, .bar3, .navbar-span").removeClass("white black").addClass($(this).hasClass("white") ? "black" : "white");
}
});
}
I added a function call on document ready, and removed your stickyOffset Variable, because on page reload/refresh you are positioned in the middle of the site, the offset is way of. Your stickyOffset needs to be a fixed value. I just added the default number of 30 in.
See a fiddle here:
http://jsfiddle.net/5gcemfz0/3/

Seems like the problem is in
$(".bar1, .bar2, .bar3, .navbar-span").removeClass("white black").addClass($(this).hasClass("white") ? "white" : "black");
that place. It says that 'if $(this) has class 'white' add 'white' else add 'black'. Should change places. Hope it helps!

Remove css class with animation

I'm creating a table and i want to highlight a specific row.
I did this using:
$this.css('background-color', 'green');
$this.delay(3000).animate({ backgroundColor: $color }, 3000);
$this = the row in question.
$color = the previous row color.
But i want it to work with the a css class, so something like this
$this.addClass('highlight');
The class .highlight will only have a background-color.
The problems is that, after i add the class, i can't the background-color.
If i use:
$this.delay(3000).animate({ backgroundColor: $color }, 3000);
it doesn't seem to work because it doesn't overrides the background-color property of the class .highlight itself.
And i don't see a way to animate a removeClass method or even a switchClass from .highlight to ''.
Is there any solution i'm not thinking off to do this.
Thanks in advance.

Use CSS transitions instead. Better performance and simpler.
Fiddle example
transition:background-color 0.3s linear;
though this doesn't provide as much browser support for the animation, obviously.

You could use jQuery UI's .switchClass which animates all the style changes: .switchClass
Once completed highlighting, use the callback to switch it back.
$('div').click(function() {
$(this).switchClass( "normal", "color", 1000, "easeInOutQuad", function(){
$(this).delay(3000).switchClass( "color", "normal", 1000, "easeInOutQuad" );
});
});
Fiddle me here!

the .animate() function works with "numeric" properties like: height, width, left, etc.. but not with background-color.
You can try this:
$(document).ready( function() {
$('tr.normal').on('click', function() {
$(this)
.hide()
.delay(3000)
.fadeIn('slow')
.toggleClass('highlight');
});
});

You could use jQuery's addClass and removeClass, consider:
if($(document).scrollTop() > 250)
{
$('#div').addClass("show");
}
else
{
$('#div').removeClass("show");
}
});
What this is doing is replacing the original class, such as "hide" with the div class "show", this particular snippet of code displays a banner when the user scrolls 250px down the page.
Remember if you're using this code that it's still better (and smoother) to use CSS3 transitions UNLESS you're considering users who's browsers don't support this, such as IE8-.
EDIT: I just realized the reason you're doing it this way is because you're considering IE7 users. Perfect. I have literally just solved this issue myself.
The workaround I used was to have a css3 transition set up, and a detector with an if statement to use jQuery where transition isn't supported, see below:
var Detect = (function() {
var
//Add CSS properties to test for
props = "transition".split(","),
//Browser prefixes
CSSprefix = "Webkit,Moz,O,ms,Khtml".split(","),
d = document.createElement("detect"),
test = [],
p, pty;
// test prefixed code
function TestPrefixes(prop) {
var
Uprop = prop.charAt(0).toUpperCase() + prop.substr(1),
All = (prop + ' ' + CSSprefix.join(Uprop + ' ') + Uprop).split(' ');
for (var n = 0, np = All.length; n < np; n++) {
if (d.style[All[n]] === "") return true;
}
return false;
}
for (p in props) {
pty = props[p];
test[pty] = TestPrefixes(pty);
}
return test;
}());
if (Detect.transition) {
$(function(){
$(window).scroll(function() {
//your code here
//remember to use an if else

Help with modifying my custom JQuery slider to allow continous scrolling

You can view my custom slider here: http://www.awaismuzaffar.com/examples/index.html
And below is the JQuery code for it:
$(document).ready(function() {
// Slider Function
var slideWidth = $('div.slide').width();
// Set the left position of each div element
$('div.slide').each(function(index){
$(this).css('left', index * slideWidth ); // Multiply each div element by the index(0, 1 etc) so each div is placed inline
});
// Next step is to animate the div elements
var clickCount = 1;
var slideCount = $('div.slide').length;
// Set the previous button to hide when loading with the first slide
if(clickCount == 1){
$('a#previous-button').css('background-color', '#cccccc');
}
$('a#next-button').click(function() {
if(clickCount < slideCount) {
$('div.slide').animate({"left":"-=" + slideWidth}, 'slow');
$('a#previous-button').css('background-color', '#ffffff');
clickCount++;
}
if(clickCount == slideCount) {
$('a#next-button').css('background-color', '#cccccc'); // Hide or grey out button
}
});
$('a#previous-button').click(function() {
if(clickCount > 1){
$('div.slide').animate({"left":"+=" + slideWidth}, 'slow');
$('a#next-button').css('background-color', '#ffffff');
clickCount--;
}
if(clickCount == 1){
$('a#previous-button').css('background-color', '#cccccc'); // Hide or grey out button
}
});
});
I am trying to modify this slider to allow continous scrolling.
I am not sure exactly how to achieve this, I am assuming I need to use append, but I am not sure how to make use of it.
Thanks.

You're doing things a little manually, I'm thinking someone else might've solved the problem. But in any case, in your click next button, you'd need to load in additional content when you hit the end. So if I were you, I'd do something like this:
$('a#next-button').click(function() {
...
if(clickCount == slideCount) {
$('a#next-button').css('background-color', '#cccccc');
$.get(moreContentUrl, objectRepresentingCurrentScrollPosition, loadContent);
spinner.show(); // show some kind of spinner here (you can also hook up a default spinner on all ajax events with a global ajax handler
}
});
function loadContent(response) {
// append your content (your controller should return just the <div class="slide" /> elements, and give them a class="slide newSlide" so you can distinguish them below
// you can also do client side templating here. would be more efficient, then just return the items as objects instead of html
$('#slide-container').append(response.itemsHtml);
// slide all new divs right
$('div.newSlide').animate({"left":"+=" + slideWidth}, 'fast');
$('div.newSlide').removeClass('newSlide');
// update variables and un-grey the next button
$('a#previous-button').css('background-color', '#ffffff');
slideCount += response.itemCount;
// hide the spinner shown when starting the load
spinner.hide();
}
Give it a shot, hope it works. Now, to clean up that code a little bit, I'd suggest using css classes instead of inline background colors, etc.

Here's a solution (somewhat like Shaz's), just less code :):
$(document).ready(function(){
$('#previous-button').click(function(){slidePanel(-1)});
$('#next-button').click(function(){slidePanel(1)});
var n = 0;
var animating = false;
$('#slide-'+n).css('display', 'block');
function slidePanel(delta)
{
if(!animating)
{
animating = true;
var d = (delta > 0 ? $('#slide-'+n).width()*-1 : $('#slide-'+n).width());
$('#slide-'+n).animate({
left: "+="+d
}, 'slow', function() { $(this).css('display', 'none'); animating = false; });
n = (n + delta) % $('div.slide').length;
n = n < 0 ? $('div.slide').length + n : n;
$('#slide-'+n).css('left', $('#slide-container').offset().left +(d*-1));
$('#slide-'+n).css('display', 'block');
$('#slide-'+n).animate({
left: 0
}, 'slow');
}
}
});
Check out the sample here.
(I know there's a way to figure out the "current slide" with a one liner equation, but I think I'm brain dead atm :P)
(Edited to account for repeatedly clicking)

Try something like this: http://fiddle.jshell.net/Shaz/dsBkf/