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change display of element with class x by clicking element with class y (JS)

Using JS or Jquery (preferred JS) how can I change the display style of an element after clicking on another element (both elements identified by their respective classes).
The below doesnt seem to work.
<script src="https://code.jquery.com/jquery-3.2.1.js"></script>
<i id="xyz" class="class1" >hey</i>
<div id="abc" class="class2" style="display: block;">lo</div>
<script type="text/javascript>
$(function() {
$(".xyz").click(function() {
console.log("element with class xyz was clicked");
$(".abc").css('display': 'none');
});
});
</script>
the console doesnt even log anything

It looks like you are trying to reference your IDs by using CLASS syntax in your jQuery selector.
Instead of using $(".xyz") use $("#xyz"). Same for your $(".abc") selector.
Hope that helps!

You should use document.querySelector(cssSelector) for getting elements by class or id or document.getElementById to get elements by id only.
Here is VanilaJS solution:
var firstElem = document.querySelector(".class1");
firstElem.addEventListener("click", function(event){
var secondElem = document.querySelector(".class2");
secondElem.style.display = "none";
})
<i id="xyz" class="class1" >hey</i>
<div id="abc" class="class2">lo</div>

Hide parent if child contains class

I followed this jQuery: Hide parent <td> if contains child <input> with specific class? but its not working in my code:
$(function() {
$(".video-list-item").filter(function() {
return $('span', this).hasClass('.view-count');
}).hide();
});
https://jsfiddle.net/xzeeuotL/

Two things to fix but you were close.
1) You did not include Jquery as a library for the JSFiddle
2) In the hasClass method you need to remove the . in the class name
$(function() {
$(".video-list-item").filter(function() {
return $('span', this).hasClass('view-count');
}).hide();
});
Here is a working fiddle
https://jsfiddle.net/rn2jzpfc/

You were close. Just one mistake in your code.
When you are checking if something hasClass there is no need to have the . preface it.
Also remember you need to include jquery.
$(function() {
$(".video-list-item").filter(function() {
return $('span', this).hasClass('view-count');
}).hide();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="video-list-item">
<span class="view-count">HIDE THIS</span>
</div>
<div class="video-list-item">
<span>DON'T HIDE THIS</span>
</div>
You can do this without Jquery
Here is an example using pure javascript.
var divSel = document.querySelectorAll('.video-list-item > .view-count');
for (var i = 0; i < divSel.length; i++) {
divSel[i].parentElement.style.display = "none";
}
<div class="video-list-item">
<span class="view-count">HIDE THIS</span>
</div>
<div class="video-list-item">
<span>DON'T HIDE THIS</span>
</div>
Hope this helps.

The next code returns the parent with video-list-item class of elements with view-count class; then hide the parent. I thinks it's more easy than your approach:
$(".view-count").closest('.video-list-item').hide();
Updated JSFiddle: https://jsfiddle.net/tomloprod/xzeeuotL/2/

Another solution:
$(function() {
$('.video-list-item').find('span.view-count').hide();
});

You have to change that syntax for your case.
you have to be sure that your <td> has a class name like ".video-list-item" and later change in the $('span', this) for $('input', this), of course, you input would has a class name like view-count. something like this..
$(function() {
$(".video-list-item").filter(function() {
return $('input', this).hasClass('view-count');
}).hide();
});
<td class="video-list-item">
<input class="view-count">
</td>
i hope it can help you.. nice day!!

Useful thing if you want to remove closest parent that contains child with specific class:
<div class="closest_parent">
<div></div>
<div class="child_class"></div>
</div>
$('.child_class').closest('.closest_parent').remove();

Add element to document and then remove it using Jquery

I am adding text to an element in Jquery using
$('.alert-saved').append('<br />See more like this >>')
I then show this to the user and pause.
$('.alert-saved').delay(5000).fadeOut(2000);
I would now like to remove all the text I appended.
I have tried this but it didn't work
$('.alert-saved').remove('<br />See more like this >>')

Just pass an empty HTML string argument:
$('.alert-saved').html('');
EDIT 1
If you need to keep other elements, you can use this method:
var newLine = jQuery('<br />See more like this');
jQuery(".alert-saved").append(newLine);
setTimeout(function() {
jQuery(newLine).remove();
}, 2000)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p class="alert-saved">
<span>I wanna stay!</span>
</p>

Change your code to :
$('.alert-saved').append('<div id="divId"><br />See more like this >></div>');
And while removing you can use :
$('.alert-saved').remove('#divId');
With the help of divId you can easily remove your appended element/string from '.alert-saved'.

Check the below code it will work as expected -
$('.alert-saved').append('<div class="testing" <br />See more like this >> </div>')
$('.alert-saved').delay(5000).fadeOut(2000);
$('.alert-saved').remove('.testing')
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="alert-saved"></div>

You could try this also :
$('.alert-saved').next().remove();

You can wrap your element in an tagged element with a class, or a custom tag, and then delete it accordingly like:
var release_id = 'demo'
$('.alert-saved').append('<div class="added"><br />See more like this >></div>')
setTimeout(function() {
$('.alert-saved>.added').remove();
}, 5000);
Demo: https://jsfiddle.net/Lxy83r43/

Whatever you append append with a class like this and remove all at once using .remove()
Checkout the demo below
$('.yes').click(function(){
$('.alert-saved').append('<div class ="added" ><br />See more like this >>');
})
$('.me').click(function(){
$('.added').remove();
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="alert-saved">
asdasdasdas
</div>
<input type="button" class="me" value="remove"/>
<input type="button" class="yes" value="add"/>

An easy way to do this work is adding class or id to appended element.
But if you don't want to do this, you can store new elements in variable and append it using .appendTo() to html document like this:
var HTML = $("<br><a>New link</a>");
$(HTML).appendTo('.alert-saved');
When you want to remove elements, use bottom code.
HTML.remove();
var HTML = $("<br><a>New link</a>");
$(HTML).appendTo('.alert-saved');
setTimeout(function(){
HTML.remove();
}, 2000);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="alert-saved">
<a>Old link</a>
</div>

Check textarea or input have some special word in need

I want to make a coding area for my website,and I need to make it having color coded(syntax highlighting),and I Google so hard,but I still can't find the right answer for me, and here is my code now.
And I'm using Jquery
HTML:
<textarea class="CodeArea codingground">
<div class="HelloMate">
</div>
</textarea>
JS:
$(function(){
$('.CodeArea.codingground').on('input',function(){
var code = $(this).val();
if (code.indexOf('class')>=0) {
$( "textarea:contains('class')" ).css( "color", "red" );
}
});
});

This is not possible with a textarea.
You can use the <code> tag in conjunction with the contenteditable attribute. Some Javascript and you'll get what you want, even though you should consider to use a library for stuff like that.
var text = jQuery('code').text();
text = text.replace('class', '<span style="color: red">class</span>');
jQuery('code').html(text);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<code contenteditable="true">
class Blubb() {
}
</code>

How do I get the content of a <span> using jQuery?

How do I get the content 'This is my name' of the span?
<div id='item1'>
<span>This is my name</span>
</div>

I think this should be a simple example:
$('#item1 span').text();
or
$('#item1 span').html();

$("#item1 span").text();

Assuming you intended it to read id="item1", you need
$('#item1 span').text()

$('#item1').text(); or $('#item1').html(); works fine for id="item1"

Since you did not provide an attribute for the 'item' value, I am assuming a class is being used:
<div class='item1'>
<span>This is my name</span>
</div>
alert($(".item span").text());
Make sure you wait for the DOM to load to use your code, in jQuery you use the ready() function for that:
<html>
<head>
<title>jQuery test</title>
<!-- script that inserts jquery goes here -->
<script type='text/javascript'>
$(document).ready(function() { alert($(".item span").text()); });
</script>
</head>
<body>
<div class='item1'>
<span>This is my name</span>
</div>
</body>

You could use id in span directly in your html.
<span id="span_id">Client</span>
Then your jQuery code would be
$("#span_id").text();
Some one helped me to check errors and found that he used val() instead of text(), it is not possible to use val() function in span.
So
$("#span_id").val();
will return null.

In javascript wouldn't you use document.getElementById('item1').innertext?

$('span id').text(); worked with me

$('#id span').text() is the answer!

$('#item1 span').html(); Its working with my code

VERY IMPORTANT Additional info on difference between .text() and .html():
If your selector selects more than one item, e.g you have two spans like so
<span class="foo">bar1</span>
<span class="foo">bar2</span>
,
then
$('.foo').text(); appends the two texts and give you that; whereas
$('.foo').html(); gives you only one of those.

<script>
$(document).ready(function () {
$.each($(".classBalence").find("span"), function () {
if ($(this).text() >1) {
$(this).css("color", "green")
}
if ($(this).text() < 1) {
$(this).css("color", "red")
$(this).css("font-weight", "bold")
}
});
});
</script>