Develop Reference

Toggle script: change from jQuery to "normal javascript" code

I've been using a toggle script (open/close text container when clicking on a certain link) for a website that uses jQuery. In order to clean up the website I want to get rid of jQuery completely but have some problems converting the existing jQuery code into "normal javascript".
Here is the existing code:
jQuery(function($){
$(document).ready(function(){
$(".toggle_container").hide();
$("h4.trigger").click(function(){
$(this).toggleClass("active").next().slideToggle("normal");
return false; //Prevent the browser jump to the link anchor
});
});
});
Which corresponds to this HTML source code:
<h4 class="trigger toggle-transparent ">Click to show more</h3><div class="toggle_container ">
Hidden Text
</div>
I've tried the following code which doesn't give me an error but just doesn't do anything when clicking on the trigger:
var el = document.querySelectorAll('h4.trigger');
for(var i=0; i < el.length; i++){
el[i].addEventListener('click', function () {
this.classList.toggle("active").nextSibling.classList.toggle("toggle_container-active");
}.bind(this));
}
The only thing I really need for the code is: clicking on the class "trigger" should toggle some HTML class "active" to both the trigger element as well as the toggle_container element. The rest I'm able to change with just CSS.
The hard part of the code is that it should work for multiple toggle areas on one page separately (therefore using a class, not an id).
Any idea where my code has a problem or any (completely) different suggestions?
I have very limited experience with javascript/jQuery and feel more at home with HTML/CSS.
Thanks,
Patrick

The this.classList.toggle("active") doesn't return the element back again, but just a boolean to inform if the action was successful. Chaining happens only in jQuery and not in vanilla JavaScript.
this.classList.toggle("active").nextSibling.classList.toggle("toggle_container-active");
You should be using something like this instead of the above:
this.classList.toggle("active");
this.nextSibling.classList.toggle("toggle_container-active");

how to detect scrollbar on application?

I have an SAPUI5 app where I display a table which goes off the screen. I have a button that I the user can click to go back to the top. The problem is that button is always displayed, even when not needed. I only want it to show up when the table goes off the screen. I've been looking for solution to this but nothing has worked so far.
Here is my button defined in my xml view
<html: a id="toTop" href ="#_xmlview0--top">
<Button id="backToTopBtn" text = "back"/>
</html:a>
and then I have this defined at the top of my view
<html:div id = top"></html:div>
I've tried different solutions I found using jquery but nothing has worked so far. I thought something like this would work
if($('body').height()>$(window).height()){
//go back to top here
}
but looking at these values body height and window height are the same. Any ideas?

To not have your button show all the time you need to hide it using styles or javascript. I'll assume you'll use display: none in this case then show it when the user has scrolled a certain amount.
element.scrollTop and element.scrollLeft give you the amount of offset an element has.
If you want to show something only when the body has been scrolled a certain amount you could do:
var page = document.body;
var button = document.getElementById('backToTopBtn');
function showScrollTopButton() {
if (page.scrollTop > xyz) {
button.style.display = 'block';
} else {
button.style.display = 'none';
}
return;
}
window.addEventListener('scroll', showScrollTopButton);
Where xyz is the numerical value for when to show and hide the button.

Need to disable hyperlinked background for section

Sort of a noob, but know enough to be dangerous. I'm working with a very jerry-rigged Wordpress site and have created this featured work gallery section that works fine except for one issue: If a user accidentally clicks the background behind the tiles, everything disappears. See for yourself:
http://neighboragency.com/#/what-we-do/
I know why this is happening, and it's because I've built this section into a function for which that behavior is preferred on other parts of the site (see "Who We Are" section). What I'm hoping to be able to do is disable the background as an active link for this particular section. Code for that particular section is below. I'm hoping there's something I can apply to the opening tag that disables that background? Or am I going to have to dig into other files? I'm not as comfortable with JQuery so hoping it can be done within this chunk of code somehow. Thanks in advance!
<ul id="list-members">
<?php
//The Query
$items = get_posts('cat=6');
$count = count($items);
$cnt = 0;
//The Loop
if ( $count > 0 ) : foreach($items as $item) :
setup_postdata($item);
$custom_values = get_post_meta($item->ID, 'position', true);
?>
<li>
<div class="entry-content">
<div class="entry-content-col1">
<div class="list-detail">
<?php the_content();?>
</div>
</div>
</div>
</li>
<?php
$cnt++;
endforeach;
endif;
?>
</ul>

Whenever an event like a "click" happens you are able to listen to it, inspect information about it, and then take some actions depending on what that information was. Since you are already using jQuery take a look at the API docs for the jQuery Event object - all of that info is available to you if you set a listener to find it.
There is almost certainly more elegant solutions for your specific page, but one straight forward way to do it would be to listen for clicks on the area in question and prevent that event from propagating.
So for a very basic solution load your page and enter this into the JS console:
Listen for clicks inside the elements you wish to "smother"
When that event occurs prevent it from propagating by calling .preventDefault() on the event object passed into the handler function.
$("ul#list-members .entry-content-col1").click(function (e) {
e.preventDefault();
return false;
});
The above solution isn't great because its targeting multiple areas. If you can add some specificity to the markup like giving the area you are concerned with a unique class or ID name you can then target it more effectively.

In your custom JS file there is a function that uses the selector #list-members. This works fine on the "Who we are" section but on your "What we do" section, the same selector is being targeted. I would suggest using a different selector that only appears in the "What we do" section. Try changing the selector on line 120 to be more specific like this.
$('#post-6 #list-members li').on('click', function(){
var arrow = $(this).find('.entry-content-arrow');
if( $(this).find('.toggle-down').length > 0 ) {
$(this).find('.list-info').slideUp('slow');
$(this).find('.list-detail').slideDown(500, function(){
arrow.removeClass('toggle-down').addClass('toggle-up');
changeInteriorH(2);
if($(this).find('p:first').is(':empty')){
$(this).find('p:first').remove();
}
});
} else {
$(this).find('.list-info').slideDown('fast');
$(this).find('.list-detail').slideUp(500, function(){
arrow.removeClass('toggle-up').addClass('toggle-down');
changeInteriorH(2);
});
}
});
For your CSS changes:
It looks like there are two CSS styles that are implying that area is clickable. On line 887 of style.css you'll see
#list-members li:hover {
background-color: #4D3A2B;
}
You need to make that more specific just like we did with your JS. Try
#post-6 #list-members li:hover {
background-color: #4D3A2B;
}
for your selector. On line 860 of the same file change
#list-members li,
#list-partners li {
to
#post-6 #list-members li,
#post-6 #list-partners li{
so that the cursor does not show up on the background.
I'm not sure why you changed the delay on your JS function above but that's why things slowed down. That was not necessary and was probably not helpful.
If my answer solves your problem, please give it an up-vote. Thanks!

HTML Divs show/hide issue

Hi friends I have issue with divs.
I have a link show/hide dive on my page on clicking which i have to show or hide specific divs.
I am successful with doing it.
But my issue is that whenever I click on that link div is get hide or shown but page get directly on the top & I have to scroll to down again.
I don't want to scroll this and don't want to get to top.
Please help me out with this.
Thank You in advance.
Update:
Friend I got the answer from one of my friend.
Actually I was using
Because of href="#" URL get changed and page got to top every time I click on that link.

Are you trying to do this?
<!DOCTYPE html>
<html lang="en">
<head>
<title></title>
<meta charset="utf-8">
</head>
<body>
<div id="wrapper">
<div id="container">
</div><!-- end of #container div -->
<a id="showdiv">Show the div</a>|<a id="hideDiv">Hide the div</a>|<a id="toggle">Toggle</a>
</div><!-- end of #wrapper div -->
</body>
</html>
Here's the css:
#container {
width: 300px;
height: 300px;
background: red;
margin-bottom: 20px;
}
#wrapper {
margin: 40px auto;
width: 400px;
}
And here's the jquery
$(function() {// When document is ready, run this...
//Get hold of the link with the id #showdiv and do something when you click it
$("#showdiv").click(function() {
// Grab the div with the id #container and show it
// Alert me when you're done
$("#container").show(2000, function() {
alert("I'm done showing");
});
});
//Get hold of the link with the id #hideDiv and do something when you click it
$("#hideDiv").click(function() {
// Grab the div with the id #container and hide it
// Alert me when you're done
$("#container").hide(2000, function() {
alert("I'm done hiding");
});
});
// Toggle - This is like a On/Off Switch
//Get hold of the link with the id #toggle and do something when you click it
$("#toggle").click(function() {
// Grab the div with the id #container and show if hidden / hide if shown
$("#container").toggle(2000);
});
});
Of course you'd have to link to a copy of jQuery before using the script above.
Here's a link to a demo: http://jsfiddle.net/tonystark/HhNBA/

Assuming you have a link
Inline (not recommended but likely what you have)
<script>
function showhide(id) {
var elem = document.getElementById(id);
elem.style.display=elem.style.display=="none"?"block":"none";
return false; // MANDATORY
}
</script>
Toggle
<div id="someId">Show or hide me when you click a link</div>

You have to cancel the default behavior of the onclick handler of your link. For doing so, don't use return false in your click handler, but rather use event.preventDefault():
HTML:
hide me
<div id="#targetdiv">blah</div>
Javascript:
document.querySelector('a.foo').onclick = function(event) {
try {
document.querySelector(this.getAttribute('href')).style.display = 'none';
} catch (e) {
console.error("couldn't find element to hide");
}
event.preventDefault();
}
JQuery:
$('a.foo').click(function(event) {
try {
$($(this).attr('href')).hide();
} catch (e) {
console.error("couldn't find element to hide");
}
event.preventDefault();
})
More informations:
http://www.quirksmode.org/js/events_early.html
http://fuelyourcoding.com/jquery-events-stop-misusing-return-false/

It happens because your link is pointing to something like #foo or just #, whereas it should not have a href (or have an empty one)...

remove the href attribute and apply a text-decoration style
<a style="text-decoration: underline;" title="click me"></a>
that'd seem to make more sense than applying an href you dont want, to block its normal operation later. an alternative for graceful degradation would be to use the href to point to the shown/hidden div, displaying normally by default and having javascript hide it where javascript is available.
"Change your anchor (link) to a span so that it doesn't have that behaviour. Then, style it using css so it looks how you want it to look."
i often use that techique. i.e., use a span or div with an onclick, styled with text-decoration: underline, cursor: pointer and possibly display: inline if you decide on a div. one caveat is that in IE6, css hover won't work on anything other than an anchor. that's easily fixed with javascript.
you could probably remove the href attribute completely. anchors have advantages as above (cross-browser :hover styles) and allow for a title attribute for tool tips etc.

you probaby have a # in href attribute like href=# please remove hash and instead of that write href='javascript:void(null);'

jQuery: how to implement this roll-out effect?

I need some help to implement this roll over / out effect.
This is the screenshot: http://dl.dropbox.com/u/72686/roll-over-out.png
I have a menu. When I roll over the item "Products" the popup block appears below it, with a tree with all products.
<div id="menu">
<div id="product"> Roll over here </div>
...
</div>
<div id="popup">
<div> <a> link </a> </div>
<div> <a> link </a> </div>
<div> <a> link </a> </div>
...
</div>
This block has css:
#popup {
position:fixed
display:none
}
Now, it is clear how to implement roll over to show the block:
("#product").mouseover(function() {
$('#popup').css("display","block");
})
However how can I handle the rollout ? I have the following issues:
1) If I add roll-out to the menu item "#product", when I roll-out from it (to move to the popup with product trees), I make this last one to disappear (because I'm leaving the menu item).
2) If I add roll out functionality to the popup, I have issues with his children. i.e. If I move the mouse over a link of the tree, the popup disappear (because I'm leaving the parent #popup).
thanks
ps. I cannot use :hover (it is not supported by jquery version on Drupal CMS).

Firstly I think you will find that mouseenter and mouseleave are better events for this kind of thing. See the jQuery example in IE to understand why, not a huge problem but you may end up wit flickering otherwise.
However that will still not solve your problem. I would suggest use a setTimeout to close the menu, and then if your mouse enters the menu before the time out cancel the time out:
var t;
$("#product").mouseleave(function() {
t = setTimeOut(function(){$('#popup').hide();}, 100);
})
$("#popup").mouseenter(function() {
if(t)
{
clearTimeout(t);
t=null;
}});
This will prevent the popup from closing if you move from the product element to the pop up element. The clear timeout method prevents the timeout function from being executed.

Thorough Tutorial: Drop down menu

I have created similar solution, you can check it out here. See the demo here.

By the way, :hover isn't jQuery - it's CSS.
http://www.w3schools.com/cssref/sel_hover.asp