Develop Reference

How do I apply jQuery's slideToggle() to $(this) and do the opposite to all other elements?

What I'd like to do is have all elements of class collapsible_list not displayed by default (with one exception... see below*), and then toggle their display when their parent <div class="tab_box"> is clicked. During the same click, I'd also like for every other element of class collapsible_list to be hidden so that only one of them is expanded at any given time.
*Furthermore, when the page initially loads I'd also like to check to see if an element of collapsible_list has a child a element whose class is activelink, and if there is one then I'd like that link's parent collapsible_list element to be the one that's expanded by default.
Here's some sample html code:
<style>
.collapsible_list {
display: none;
}
.collapsible_list.active {
display: block;
}
</style>
<div id="sidebar">
<div class="tab_box">
<div class="collapsible_tab">2014</div>
<div class="collapsible_list panel-2014">
1
2
3
</div>
</div>
<div class="tab_box">
<div class="collapsible_tab">2013</div>
<div class="collapsible_list panel-2013">
<a class="activelink" href="/2013/1">1</a>
2
3
</div>
</div>
</div>
And here's where I'm currently at with the javascript (although I've tried a bunch of different ways and none have worked like I'd like them to):
$(document).ready(function() {
// This looks redundant to me but I'm not sure how else to go about it.
$(".collapsible_list").children("a.activelink").parent(".collapsible_list:not(.active)").addClass("active");
$(".tab_box").click(function() {
$(this).children(".collapsible_list").toggleClass("active").slideToggle("slow", function() {
$(".collapsible_list.active:not(this)").each(function() {
$(this).slideToggle("slow");
});
});
});
});
I hope that's not too confusing, but if it is then feel free to let me know. Any help is much appreciated.

Since you have a dom element reference that needs to be excluded use .not() instead of the :not() selector
jQuery(function ($) {
// This looks redundant to me but I'm not sure how else to go about it.
$(".collapsible_list").children("a.activelink").parent(".collapsible_list:not(.active)").addClass("active").show();
$(".tab_box").click(function () {
var $target = $(this).children(".collapsible_list").toggleClass("active").stop(true).slideToggle("slow");
//slidup others
$(".collapsible_list.active").not($target).stop(true).slideUp("slow").removeClass('active');
});
});
Also, instead of using the slide callback do it directly in the callback so that both the animations can run simultaniously
Also remove the css rule .collapsible_list.active as the display is controlled by animations(slide)

Try This.
$('.collapsible_tab a').on('click', function(e){
e.preventDefault();
$('.collapsible_list').removeClass('active')
$(this).parent().next('.collapsible_list').toggleClass('active');
});
Fiddle Demo

I think your code would be less complicated if you simply remembered the previously opened list:
jQuery(function($) {
// remember current list and make it visible
var $current = $('.collapsible_list:has(.activelink)').show();
$(".tab_box").on('click', function() {
var $previous = $current;
// open new list
$current = $('.collapsible_list', this)
.slideToggle("slow", function() {
// and slide out the previous
$previous.slideToggle('slow');
});
});
});
Demo

how to repeat same Javascript code over multiple html elements

Note: Changed code so that images and texts are links.
Basically, I have 3 pictures all with the same class, different ID. I have a javascript code which I want to apply to all three pictures, except, the code needs to be SLIGHTLY different depending on the picture. Here is the html:
<div class=column1of4>
<img src="images/actual.jpg" id="first">
<div id="firsttext" class="spanlink"><p>lots of text</p></div>
</div>
<div class=column1of4>
<img src="images/fake.jpg" id="second">
<div id="moretext" class="spanlink"><p>more text</p></div>
</div>
<div class=column1of4>
<img src="images/real.jpg" id="eighth">
<div id="evenmoretext" class="spanlink"><p>even more text</p></div>
</div>
Here is the Javascript for the id="firsttext":
$('#firstextt').hide();
$('#first, #firsttext').hover(function(){
//in
$('#firsttext').show();
},function(){
//out
$('#firsttext').hide();
});
So when a user hovers over #first, #firsttext will appear. Then, I want it so that when a user hovers over #second, #moretext should appear, etc.
I've done programming in Python, I created a sudo code and basically it is this.
text = [#firsttext, #moretext, #evenmoretext]
picture = [#first, #second, #eighth]
for number in range.len(text) //over here, basically find out how many elements are in text
$('text[number]').hide();
$('text[number], picture[number]').hover(function(){
//in
$('text[number]').show();
},function(){
//out
$('text[number]').hide();
});
The syntax is probably way off, but that's just the sudo code. Can anyone help me make the actual Javascript code for it?

try this
$(".column1of4").hover(function(){
$(".spanlink").hide();
$(this).find(".spanlink").show();
});

Why not
$('.spanlink').hide();
$('.column1of4').hover(
function() {
// in
$(this).children('.spanlink').show();
},
function() {
// out
$(this).children('.spanlink').hide();
}
);
It doesn't even need the ids.

You can do it :
$('.column1of4').click(function(){
$(this); // the current object
$(this).children('img'); // img in the current object
});
or a loop :
$('.column1of4').each(function(){
...
});
Dont use Id as $('#id') for multiple events, use a .class or an [attribute] do this.

If you're using jQuery, this is quite easy to accomplish:
$('.column1of4 .spanlink').hide();
$('.column1of4 img').mouseenter(function(e){
e.stopPropagation();
$(this).parent().find('.spanlink').show();
});
$('.column1of4 img').mouseleave(function(e){
e.stopPropagation();
$(this).parent().find('.spanlink').hide();
});

Depending on your markup structure, you could use DOM traversing functions like .filter(), .find(), .next() to get to your selected node.
$(".column1of4").hover(function(){
$(".spanlink").hide();
$(this).find(".spanlink, img").show();
});

So, the way you would do this, given your html would look like:
$('.column1of4').on('mouseenter mouseleave', 'img, .spanlink', function(ev) {
$(ev.delegateTarget).find('.spanlink').toggle(ev.type === 'mouseenter');
}).find('.spanlink').hide();
But building on what you have:
var text = ['#firsttext', '#moretext', '#evenmoretext'];
var picture = ['#first', '#second', '#third'];
This is a traditional loop using a closure (it's better to define the function outside of the loop, but I'm going to leave it there for this):
// You could also do var length = text.length and replace the "3"
for ( var i = 0; i < 3; ++i ) {
// create a closure so that i isn't incremented when the event happens.
(function(i) {
$(text[i]).hide();
$([text[i], picture[i]].join(',')).hover(function() {
$(text[i]).show();
}, function() {
$(text[i]).hide();
});
})(i);
}
And the following is using $.each to iterate over the group.
$.each(text, function(i) {
$(text[i]).hide();
$([text[i], picture[i]].join(', ')).hover(function() {
$(text[i]).show();
}, function() {
$(text[i]).hide();
});
});
Here's a fiddle with all three versions. Just uncomment the one you want to test and give it a go.

I moved the image inside the div and used this code, a working example:
$('.column1of4').each(function(){
$('div', $(this)).each(function(){
$(this).hover(
function(){
//in
$('img', $(this)).show();
},
function(){
//out
$('img', $(this)).hide();
});
});
});
The general idea is 1) use a selector that isn't an ID so I can iterate over several elements without worrying if future elements will be added later 2) locate the div to hide/show based on location relational to $(this) (will only work if you repeat this structure in your markup) 3) move the image tag inside the div (if you don't, then the hover gets a little spazzy because the positioned is changed when the image is shown, therefore affecting whether the cursor is inside the div or not.
EDIT
Updated fiddle for additional requirements (see comments).

Collapse HTML if no content found

I want to be able to remove HTML elements if they contain no content.
Let's say we have some markup and are targeting all 'collapse' classes:
<div class='collapse'>[CONTENT?]</div>
If there is some content then don't do anything.
But if there is no content - no string characters or whitespace - then remove the div element completely.
This is easy to implement in the simple cases but with nested content it's slightly more more tricky.
Here is a demo, if you try removing the [CONTENTX?] strings and then seeing what the HTML structure is you'll notice that it doesn't work completely.
If a div only has other divs with no content then that should be treated as no characters or whitespace.
If we remove all [CONTENTX?] strings then we should see no HTML structure.
What ways are there to handle this?
jsFiddle: http://jsfiddle.net/97udq/
HTML:
<div id='container'>
<div class='collapse'>
[CONTENT1?]
</div>
<div class='collapse'>
[CONTENT2?]
<div class='collapse'>
[CONTENT3?]
<div class='collapse'>[CONTENT4?]</div>
<div class='collapse'>[CONTENT5?]</div>
</div>
</div>
</div>
Javascript:
$(function(){
// function
collapse();
// Show HTML structure
alert($('#container').html());
});
function collapse(){
// Loop thru all collapse elements
$('.collapse').each(function(){
// Check for pure whitespace
if($(this).html().replace(/\s+/g, '').length==0){
// Nothing to see, so remove.
$(this).remove();
}
});
}
CSS:
.collapse{
height:20px;
border:1px solid red;
}

I think this does the job;
It just uses text() instead of html();
Here's the documentation.
This one adds the trim(), but I thik that's not what you want.
function collapse(){
$('.collapse').each(function(){
if($(this).text().length==0){
$(this).remove();
}
});
}

Here's another way of accomplishing what you want. It recurses down the DOM pruning nodes from the bottom up. Hope this helps.
function prune(root) {
$.each($(root).children(), function(){
prune($(this));
});
if($(root).html().replace(/\s+/g, '').length==0 && $(root).hasClass("collapse")){
$(root).detach();
}
}
Code integrated into your JSFiddle

You need to recreate the .each() loop, but reversed. Just like that :
function collapse(){
var el = $('.collapse');
for(var i = el.length - 1; i >= 0; i--){
if(el[i].innerHTML.replace(/\s+/g, '').length==0){
$(el[i]).remove();
}
}
}
It will remove the childrens first, then check for parent.
Here a fiddle : http://jsfiddle.net/97udq/5/
EDIT :
I missunderstood your question, here's the right solution :
function collapse(){
$('.collapse').each(function(){
var $this = $(this)
var clone = $this.clone();
clone.children().remove();
if(clone.html().replace(/\s+/g, '').length==0){
$this.children().appendTo($this.parent());
$this.remove()
}
})
}
Basicly, you clone the current div, remove its children and then check if there is some text. If there's none, you append his children to his parent
Fiddle : http://jsfiddle.net/97udq/9/

How to detect mouseleave() on two elements at once?

Answer can be in vanilla js or jQuery. I want to hide a div with the id "myDiv" if the user is no longer hovering over a link with the id "myLink" or a span with the id "mySpan". If the user has his mouse over either element "myDiv" will still show, but the second the user is not hover over either of the two (doesn't matter which element the user's mouse leaves first) "myDiv" will disappear from the face of existence.
In other words this is how I detect mouse leave on one element:
$('#someElement').mouseleave(function() {
// do something
});
but how to say (in a way that will actually work):
$('#someElement').mouseleave() || $('#someOtherElement').mouseleave()) {
// do something
});
How to detect this?

Something like this should work:
var count = 0;
$('#myLink, #mySpan').mouseenter(function(){
count++;
$('#myDiv').show();
}).mouseleave(function(){
count--;
if (!count) {
$('#myDiv').hide();
}
});
jsfiddle

You could use a multiple selector:
$("#someElement, #someOtherElement").mouseleave(function() {
// Do something.
});

You can beautifully use setTimeout() to give the mouseleave() function some "tolerance", that means if you leave the divs but re-enter one of them within a given period of time, it does not trigger the hide() function.
Here is the code (added to lonesomeday's answer):
var count = 0;
var tolerance = 500;
$('#d1, #d2').mouseenter(function(){
count++;
$('#d3').show();
}).mouseleave(function(){
count--;
setTimeout(function () {
if (!count) {
$('#d3').hide();
}
}, tolerance);
});
http://jsfiddle.net/pFTfm/195/

I think, it's your solution!!!
$(document).ready(function() {
var someOtherElement = "";
$("#someElement").hover(function(){
var someOtherElement = $(this).attr("href");
$(someOtherElement).show();
});
$("#someElement").mouseleave(function(){
var someOtherElement= $(this).attr("href");
$(someOtherElement).mouseenter(function(){
$(someOtherElement).show();
});
$(someOtherElement).mouseleave(function(){
$(someOtherElement).hide();
});
});
});
----
html
----
<div id="someElement">
<ul>
<li>element1</li>
<li>element2</li>
</ul>
</div>
<div id="tab1" style="display: none"> TAB1 </div>
<div id="tab2" style="display: none"> TAB1 </div>

While the answer from lonesomeday is perfectly valid I changed my html to have both elements in one container. I originally wanted to avoid this hence I had to do more refactoring for my clients in other html templates, but I think it will pay out on the long term.
<div id="my-container">
<div class="elem1">Foo</div>
<div class="elem2">Bar</div>
</div>
$('#my-container').mouseleave(function() { console.log("left"); });

Use jQuery to check if all div's are hidden

How would I check if all the div's with class test are hidden. And if they are all hidden set wrap1 to hidden. Thanks.
<div id='wrap1'>
<div class="header">Header 1</div>
<div class='test'>Test 1</div>
<div class='test'>Test 2</div>
<div class='test'>Test 3</div>
</div>
UPDATE:
Thanks everyone for the really quick answers, I got it working. They were all very helpful.

You can do the check as by using selector as suggested above and to it like this:
if ( $("div.test:visible").length === 0)
$("#wrap1").hide( );

This snippet will loop all <div id="wrap#"> and hide them if the test are hidden.
$("div[id^='wrap']").each(function() {
var wrap = $(this);
if(wrap.children("div[class^='test']:visible").length == 0) {
wrap.hide();
} else {
wrap.show();
}
});
If you still want to keep your <div id="wrap#"> visible if there are no test at all (as in none in the markup), you can use the following modified snippet:
$("div[id^='wrap']").each(function() {
var wrap = $(this);
if(wrap.children("div[class^='test']").length > 0 &&
wrap.children("div[class^='test']:visible").length == 0) {
wrap.hide();
} else {
wrap.show();
}
});
There is no compelling reason to number classes (other than in edge cases). Your numbering complicates the above code as well as your CSS. It would be easier just to remove the numbering from test. (You don't need it as you can always select a subset of them using :lt(index), :gt(index), :eq(index), :first and :last.
As for numbering ids, that's fine since each id must be unique.

Better way to see if they are all visible is the count for visibility the same as the total count.
$("#wrap1 div:visible").length == $("#wrap1 div").length

jQuery("#wrap1").find("div").each(function()
{
if ($(this).is(':hidden'))
{
}
}
);