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");

JS class change script? (Working in JS Fiddle)

JS noob here looking for some help. I've written something extremely basic in able to change a class which would hide a page element. The hide class just has a display none.
I've got it working fine in JS fiddle but when replicating it on my site, nothing happens? What am I doing wrong?
JS Fiddle - https://jsfiddle.net/MattPremier/x8rmn4cb/2/
<script type="text/javascript">
window.onload = function () {
var bookShow = "No";
if (bookShow == "No") {
// execute this code
document.getElementById('booking-show').classList.add('hide-widget');
}
else {
// execute this code
document.getElementById('booking-show').classList.add('show-widget');
}
};
</script>
<div id="booking-show" class="show-widget"><p>WORKING?</p></div>

I would recommend checking your CSS to make sure that the display isn’t otherwise set unless you need it to be set then inside the hide-widget CSS class put:
“display: none !important;”
And also remove show-widget from the object at the bottom as it might be conflicting with CSS.
Note Sorry for the bad formatting of this message as I’m on my cell phone.

Completely removing loaded forms with jQuery -

So I'm using .load() to load a view into an element - and when I'm done with it I do an .innerHTML = '' to get rid of it.
But if I do it more than once (i.e. close and open the element) - the form is definitely gone in between and reloaded, but when I submit it submits duplicates.
Here is the code:
$('a.comments').click(function(e){
e.preventDefault();
// $('.overlaybackground').addClass('open');
Component.Overlay.toggleOverlay();
$('#commentcontainer').load($(this).attr('href'), function(){
Component.Forms.init(page, {});
});
});
$('.overlaybackground').click(function(e){
if(e.target.className == 'overlaybackground open'){
e.preventDefault();
Component.Overlay.toggleOverlay();
// $('.overlaybackground').remove('*:not(#commentcontainer)');
document.getElementById('commentcontainer').innerHTML = '';
}
});

Not sure of the specific scenario. But if you only want to toggle the visual, simply toggle the CSS property display of the form instead of removing it from the DOM:
display:none<--> display:block

Try the following:
$('#commentcontainer').empty()

Javascript replace content innerhtml on click with integrated PHP tag

I am trying to replace the content of a DIV once the button inside that DIV is clicked, (basically replacing the button, which retreives a PHP variable:
<div id="buttonholder">
Publish
</div>
I am trying to replace it with an unpublish button after a post is published (when the button above is clicked):
function publish(status){
document.getElementById("buttonholder").innerHTML = 'Unpublish';
}
It does not work however ... What am I doing wrong ?

Your code syntax is wrong. Use like below.
function publish(status){
document.getElementById("buttonholder").innerHTML = 'Unpublish';
}

Add a button id and then do:
$(function() {
$("#buttonId").click(function() {
$("#buttonHolder").html(" html to replace with ");
});
});
Also you can use the $("#buttonHolder").html(" html to replace with "); instruction in your onClick function as well.

Show/Hide div using if then statement (javascript)

I have this show/hide set up here: http://jsfiddle.net/TwDSx/38/
What I would like to do is have the plus sign go away if the content is showing and vise versa if the content isn't showing hide the minus sign and show the plus.
I read articles on this using images to swap out, but nothing with just using html/css. Also, I would like to keep the javascript out of the html if this is possible, and just call for it externally.
any help is appreciated!

EDIT :
You can attach an event handler on your click to toggle the display attribute of the + or - button
$('#hide,#show').click(function(){
$('#hide,#show').toggle();
})
Quick demo:
http://jsfiddle.net/TwDSx/39/

I modified your Javascript a little and extended it so you can keep it in an external file, you just need to ensure you hide the #show div with CSS if you load the page with the content already showing, or vice-versa for the #hide.
The Javascript is as follows:
$('#show').click(function() {
ShowClick();
});
$('#hide').click(function() {
HideClick();
});
//This Javascript can be external
function ShowClick() {
$('#content').toggle('slow');
$('#hide, #show').toggle();
};
function HideClick() {
$('#content').toggle('fast');
$('#show, #hide').toggle();
};
The Js-Fiddle can be seen here: http://jsfiddle.net/mtAeg/

I think the simplest solution is to have only one button, #toggle, and to change the content of that button like so:
$('#toggle').click(function () {
if (this.innerHTML == '-') {
$('#content').slideUp('fast');
this.innerHTML = '+';
} else {
$('#content').slideDown('slow');
this.innerHTML = '-';
}
});
fiddle