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Find div before button

Im trying addClass to wizard-step when button clicked, but still no luck :/
<div class="mt-4">
<div class="wizard-steps">
<div class="wizard-step">
<div class="wizard-step-icon">
<i class="far fa-user"></i>
</div>
</div>
<form class="wizard-content mt-2" id="regForm">
<fieldset>
<div class="form-group row">
<div class="col-lg-4 col-md-6 text-right">
<button type="button" onclick="step0(this);" class="btn">Next</button>
</div>
</div>
</fieldset>
</form>
</div>
JavaScript:
<script>
function step0(element) {
$(element).prev('div').find('.wizard-step').addClass('wizard-step-active');
}
</script>
Can anyone please help me !

prev is used to retrieve a previous sibling element. The .wizard-step you want to target is a child of a sibling to a parent of the button being clicked. As such you need to use closest() instead.
Also note that onclick (and all the other onX attributes) are not good practice and should be avoided. As you're already using jQuery you can attach your event unobtrusively, like this:
jQuery($ => {
$('.btn').on('click', function() {
$(this).closest('.wizard-steps').find('.wizard-step').addClass('wizard-step-active');
});
});
.wizard-step-active { color: #C00; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="mt-4">
<div class="wizard-steps">
<div class="wizard-step">
<div class="wizard-step-icon">
<i class="far fa-user">User icon</i>
</div>
</div>
<form class="wizard-content mt-2" id="regForm">
<fieldset>
<div class="form-group row">
<div class="col-lg-4 col-md-6 text-right">
<button type="button" class="btn">Next</button>
</div>
</div>
</fieldset>
</form>
</div>
Alternatively, instead of calling find() from the shared parent, you could select the form and use prev():
$('.btn').on('click', function() {
$(this).closest('.wizard-content').prev('.wizard-step').addClass('wizard-step-active');
});
Either is fine, it just depends on how your HTML is structured as to which fits best for this use case.

You don't want the div immediately before the button, but the one containing the relevant item(s). So instead of $(element).prev('div') write $('.mt-4').

Your this parameter is referring your button, not your div.
You can do this without Jquery, just using your function like this:
function step0() {
const element = document.getElementsByClassName('wizard-step');
element.classList.add('wizard-step-active');
}
So, you don't need to pass this as a parameter to step0 function.

jQuery element removal

I want to remove an element using jQuery.
HTML:
<div class="listContainer" id="listContainer">
<div class="listItem">
<div class="name">
Item Name
</div>
<div class="amount">
<input type="text" class="amountInput" />
</div>
<div class="delete">
<div class="deleteBtn">
X
</div>
</div>
</div>
</div>
There are several listItemss on the page and each of the listItem will be created dynamically using jQuery. I want to delete amountInput of specific listItem by clicking the deleteBtn, so I tried doing:
$("#listContainer").on("click", ".deleteBtn", function() {
$(this).closest(".amountInput").remove();
});
This doesn't work. But on the other hand if I try to delete a listItem as a whole, the code works:
$("#listContainer").on("click", ".deleteBtn", function() {
$(this).closest(".listItem").remove();
});
Why is this happening?
Thanks.

Because .closest propagates to the top of the HTML. So it searches for the first parent that matches your selector. That is why it cannot find .amountInput. Because it isn't a parent of your button.
To get .amountInput you have to:
$("#listContainer").on("click", ".deleteBtn", function() {
$(this).closest(".listItem").find('.amountInput').remove();
});
This will get the wrapping .listItem element and then search it for the .amountInput element.

Your selector is not correct, use find instead of closest could be helpful in this case, also $(this) in your sample is related to deleteBtn class not to listContainer.
$("#listContainer").on("click", ".deleteBtn", function() {
console.log($(this)) // this here is .deleteBtn not listContainer
$(this).closest(".listItem").find(".amountInput").remove();
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="listContainer" id="listContainer">
<div class="listItem">
<div class="name">
Item Name
</div>
<div class="amount">
<input type="text" class="amountInput" />
</div>
<div class="delete">
<div class="deleteBtn">
X
</div>
</div>
</div>
</div>

Hiding/Showing divs on click

I have created a script that when a button is clicked it displays all of the content beneath it and hides the other buttons content. The only problem I'm having is that I want to refactor the script so it only works if you hit the button, instead of the entire div the button sits in as it's causing some confusion. What would be the best way about this?
<div class="signup-button">
<button type="button" class="btn btn-default">Subscribe</button>
<div class="signup-form" style="display:none;">
Content
</div>
</div>
<div class="signup-button">
<button type="button" class="btn btn-default">Subscribe</button>
<div class="signup-form" style="display:none;">
Content
</div>
</div>
<div class="signup-button">
<button type="button" class="btn btn-default">Subscribe</button>
<div class="signup-form" style="display:none;">
Content
</div>
</div>
<div class="signup-button">
<button type="button" class="btn btn-default">Subscribe</button>
<div class="signup-form" style="display:none;">
Content
</div>
</div>
jQuery:
(function($) {
$(".signup-button").on('click', function() {
$(".signup-button").not(this).find(".signup-form").hide();
$(this).find(".signup-form").toggle("slow");
});
})(jQuery);
JSFiddle: https://jsfiddle.net/v6bmphct/3/

One option would be to attach the event listener directly to the descendant button element. In doing so, the click event isn't triggered when clicking on the other content. You would also have to change instances of $(this) to $(this).parent() or $(this).closest('.signup-button').
Updated Example
$(".signup-button .btn").on('click', function(e) {
$(this).parent().find(".signup-form").toggle("slow");
$(".signup-button").not($(this).parent()).find(".signup-form").hide();
});
Alternatively, since event.target is a reference to the clicked element, you could also just check to see if event.target is the button element by using the .is() method:
Updated Example
$(".signup-button").on('click', function(e) {
if ($(e.target).is('.btn')) {
$(this).find(".signup-form").toggle("slow");
$(".signup-button").not(this).find(".signup-form").hide();
}
});

Check this out:
(function($) {
$(".signup-button").find('button').on('click', function() {
$(this).siblings(".signup-form").toggle("slow");
$(".signup-button").not(this.closest(".signup-button")).find(".signup-form").hide();
});
})(jQuery);

Remove a div with it's child elements in jquery

I have a method from where I need to remove the current div with it's element on clink. But it's not doing anything. I have searched goggle for it and applied various thing but no result. Can anyone please help me on this please?!!! Here are my code below ::
my div where my elements and remove link are stated >>>
<div class="col-xs-4 pNorPpl" id="pPeople">
<div class="form-group">
<label for="participatedPeopleName"><g:message code="sl" default="সদস্যের নাম" /></label>
<g:textField id="participatedPeopleName" name="participatedPeopleName" class="form-control"/>
<a onclick="addAnotherNormalPeople()">Add More</a> ||
<a onclick="removeThisMember()">Remove</a>
</div>
</div>
my remove function >>>
function removeThisMember(){
$(this).closest('.pNorPpl').remove();
}

The context of this does not carry through when you use on* attributes. Instead you need to pass it:
<a onclick="removeThisMember(this)">Remove</a>
function removeThisMember(el) {
$(el).closest('.pNorPpl').remove();
}
Or you can attach your event via jQuery:
Remove
$('.pNorPpl').on('click', '.remove-link', function(e) {
e.preventDefault();
$(this).closest('.pNotPpl').remove();
});

Try with this solution:
http://jsbin.com/tuniyucuki/1
HTML
<div class="col-xs-4 pNorPpl" id="pPeople">
<div class="form-group">
<label for="participatedPeopleName"><g:message code="sl" default="সদস্যের নাম" /></label>
<g:textField id="participatedPeopleName" name="participatedPeopleName" class="form-control"/>
<a onclick="addAnotherNormalPeople()">Add More</a> ||
<a class="removeFromHere" >Remove</a>
</div>
</div>
JAVASCRIPT
$(document).ready(function(){
$('.removeFromHere').click(function(){
$(this).closest('.pNorPpl').remove();
})
})

On click not working after appending checkbox elements in jquery

The contact_container div holds contact children, within these children is a checkbox. I use ajax to append these children to the container. Once I append the html and click a childs checkbox. The .click does not recognize the newly added checkboxes, Only the children work on page load. Below are working samples of my HTML and Jquery.
Can you offer a solution so that the appended checkboxes are picked up when they are clicked? Thanks
Here is my HTML markup:
<div id="contact_container">
<div class="contact">
<div class="contact_checkbox">
<div class="checkbox_container">
<div class="checkbox">
<input class="testing_checkbox" type="checkbox" name="contacts[]" value="bf6b0049059ec8998601f8fe20acb68ecafe2d44">
</div>
</div>
</div>
<div class="contact_info">
<div class="contact_image">
<img src="image.jpg" width="50" height="50" alt="Profile Picture">
</div>
<div class="contact_name"><span>Caroline Airey</span>
</div>
</div>
</div>
</div>
<div id="x_message" class="inputdata" style="overflow: hidden; display: none;">
<label>Message:</label>
<span><textarea name="x_message" placeholder="Enter a message to send to your contact(s)"></textarea></span>
<div class="clear"></div>
<button class="form_button">Add Contact to Network</button>
</div>
Here is my Jquery:
$( ".checkbox" ).click(function() {
var checked = $('.testing_checkbox:checked').length;
$('#testing').val(checked);
if (checked > 0){
$('#x_message').show(1000);
}
else{
$('#x_message').hide(1000);
}
});

You will need the Parent reference to bind the element properly to jquery try this
$(parentObj).on("click",".checkbox",function() {
var checked = $('.testing_checkbox:checked').length;
$('#testing').val(checked);
if (checked > 0){
$('#x_message').show(1000);
}
else{
$('#x_message').hide(1000);
}
});
The parentObj is the div or the html element you've appended the html code with ajax call

Use this jQuery method instead:
$(".checkbox").on("click", function()
{
// Your code here
});
This will grab clicks from elements that are dynamically added to your page after it initially loads :)