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How to use each() with mouseenter, mouseover and data attributes right

I have a block which has some data attributes:
<div class="my-div" data-color="#ff4b4b" data-hover="#000">
Text
</div>
Now I want to use javascript for changing text color on mouseenter and mouseover using my data attributes.
So I have:
$(".my-div").each(function() {
$(this).mouseenter(function() {
$(this).css('color', this.dataset.hover);
});
$(this).mouseleave(function() {
$(this).css('color', this.dataset.color);
});
});
If I have one div, it's working fine, but if I have another divs with the same class, and I mouseenter and mouseover one div, another divs react too.
What should I do to make it working right, maybe add an index, I don't know.
Can you help me, please?
Thanks in advance. Sorry for my English.
P.S. Don't advise css, for this I must use javascript.

Your code should work by itself but you don't need to loop through each div to check if the mouse has entered or left each div element - it's extremely inefficient.
So remove:
$(".my-div").each(function() {});
Your new code should look like the following:
$(".my-div").mouseenter(function() {
$(this).css('color', this.dataset.hover);
});
$(".my-div").mouseleave(function() {
$(this).css('color', this.dataset.color);
});
.my-div {
position: relative;
display: inline-block;
width: 100px;
height: 100px;
color: #ff4b4b;
border: 1px solid #000000;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="my-div" data-color="#ff4b4b" data-hover="#000">
Text
</div>
<div class="my-div" data-color="#ff4b4b" data-hover="#000">
Text
</div>
<div class="my-div" data-color="#ff4b4b" data-hover="#000">
Text
</div>
Obviously the CSS isn't necessary but I have added it to prove that it works correctly.

Get the target element of the event passed into each handler using $(this):
$(".my-div").each(function() {
$(this).mouseenter(function(e) {
$(this).css('color', this.dataset.hover);
});
$(this).mouseleave(function(e) {
$(this).css('color', this.dataset.color);
});
});
.my-div{
font-size: 20px;
line-height: 25px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="my-div" data-color="black" data-hover="red">
Text 1
</div>
<div class="my-div" data-color="black" data-hover="green">
Text 2
</div>
<div class="my-div" data-color="black" data-hover="blue">
Text 3
</div>

Limit selectable divs in a parent div

I'd like to create a product feature selection page where the user needs to select 3 features out of 6. Now, I got to a point where I can limit the number of selectable elements so if 3 elements are selected, the user wont be able to select a 4th one.
I need to modify this so when the user is attempting to select the 4th element, the 1st element they selected becomes unselected and the 4th element becomes selected. I hope it makes sense.
$('div').click(function(e) {
var $et = $(e.target);
if ($et.hasClass('fill')) {
$et.removeClass('fill');
} else {
if ($('.fill').length < 2) {
$et.addClass('fill');
}
}
});
div {
border: 1px solid blue;
height: 25px;
margin-bottom: 5px;
}
.fill {
background-color: red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<div id="1">one</div>
<div id="2">two</div>
<div id="3">three</div>
<div id="4">four</div>
This fiddle shows where I'm at with my code: http://jsfiddle.net/MarKP/32/
This fiddle is not mine, but this is exactly what I have right now in my project.
I'm trying to get this done using jQuery or plain JavaScript.
Thank you in advance!

To achieve this you can maintain an array which holds the order in which the elements were clicked. Then, when the limit is hit, you can remove the class from the element which was selected first. Try this:
var selections = [];
var $div = $('div').click(function(e) {
selections.push(this.id);
if (selections.length > 3)
selections.shift(); // remove first item
setState();
});
function setState() {
$div.removeClass('fill');
$div.filter(`#${selections.join(',#')}`).addClass('fill');
}
div {
border: 1px solid blue;
height: 25px;
margin-bottom: 5px;
}
.fill {
background-color: red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="1">one</div>
<div id="2">two</div>
<div id="3">three</div>
<div id="4">four</div>
<div id="5">five</div>
<div id="6">six</div>
Finally, note that jQuery 1.4.4 is massively outdated; nearly 10 years in fact. You need to update it.

Show div if another div has content

So I don't get why this isn't working. I want to show a Div when another div has a value. I got this code from stackoverflow and it's pretty simple. But it doesn't work for me. No console errors..
$(document).ready(function(){
if ($(".txt").html().length > 0) {
$('.btn-01').show();
}
});
If the html value of .txt is larger then 0 then show btn-01.
But it doesn't. In my web inspector it just says:
<div style="display: block;" class="btn-01"><p>Things</p></div>
If I remove the script it says:
<div class="btn-01"><p>Things</p></div>
So it does do something. I tried changing the show to hide. But no go.
<div style="display: none;" class="btn-01"><p>Things</p></div>
I tried:
$(document).ready(function(){
if ($(".txt").html().length > 0) {
$('.btn-01').addClass('showme);
}
});
btn-01 css:
.btn-01 {
background: #f60;
color: #fff;
border-radius: 2px;
padding: 5px;
text-align: center;
margin: 40px auto 0px auto;
width: 90%;
}
But that didn't work either. Does anyone know whats going on here?
Maybe I should work with an else statement? Help would be much appreciated.
JsFiddle

You need to either set the button to display none prior to the window loading or add an "else" statement to hide the element:
.btn-01{
display:none;
}
OR
$(document).ready(function(){
if ($(".txt").html().length > 0) {
$('.btn-01').show();
}
else
{
$('.btn-01').hide();
}
});
See the fiddle: https://jsfiddle.net/r89gg7tp/
IMPORTANT TO CONSIDER
If you have entered a line break between the starting and closing tags of the element, this will add to the length. You need to set the txt div to be in the following format:
<div class='txt'></div>
It may be better to change your function to this:
$(document).ready(function(){
if ($(".txt").html().trim(' ').length > 0) {
$('.btn-01').show();
} else {
$('.btn-01').hide();
}
});
This way you trim the whitespace before checking.
See the second fiddle: https://jsfiddle.net/r89gg7tp/3/

You need to hide the btn-01 with a "display:none" in the stylesheet and then execute your script.
I think you are having a "display:none !important" which is overriding the jquery show() function inline style.

This might help you.
$(document).ready(function(){
if (!$.trim($(".txt").html())){
$('.btn-01').addClass('showme');
}
});
Please let me know if you've any queries.

You can use .contents() with .toggle():
$(document).ready(function() {
$('.btn-01').toggle($(".txt").contents().length > 0);
});
.btn-01{display:none;}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="txt">
<h3>Things Title</h3>
</div>
<div class="btn-01">
<p>Things</p>
</div>

You guys where all right. I needed to place the code in some Session file (Ajax). Now its working with the original code and even some that you provide.
Thanks!

stuck with onclick tried google couldn't find answer

i need help getting this to work, tried everything google had to offer.. but still stuck. what i need it to do is load the value of (div id="availablecredits") to (div id="beta") on click. can any body help me out?
onclick="javascript:document.getElementById('beta').value=(javascript:document.getElementById('availablecredits').value)"
i also tried onclick="javascript:document.getElementById('beta').value=('#availablecredits')"

The property value is common for input elements like <input>, <select>, <textarea> and <button>
I think what you want is to copy a content of a <div> element to another div. If it's the case, use innerHTML instead of value.
Here is a snippet, just click on the gray area.
#div-two {
min-height: 20px;
background: #CCC;
}
<div id="div-one">
Hello this is #div-one
</div>
<div id="div-two" onclick="document.getElementById('div-two').innerHTML=document.getElementById('div-one').innerHTML"></div>
SNIPPET #2
You've defined a third <div> which you use as trigger but you can't click it if it's not visible, because it's height is 0. Specify some text inside it, then it's visible and the JS part work. Take a look at the snippet.
#getCredits {
background: #CCC;
}
<div id="beta">0.00</div>
<div id="availablecredits">500</div>
<div id="getCredits" onclick="document.getElementById('beta').innerHTML=document.getElementById('availablecredits').innerHTML">Click here to get available credits</div>
SNIPPET #3 - jQuery
$('#getCredits').click(function() {
$("#beta").html($('#availablecredits').html());
});;
#getCredits {
background: #CCC;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="beta">0.00</div>
<div id="availablecredits">500</div>
<div id="getCredits">Click here to get available credits</div>

Simple javascript function, change the ids in the function call to those of the elements in question.
<script>
function set_value( src,tgt ){
document.getElementById( tgt ).innerHTML=document.getElementById( src ).innerHTML;
}
</script>
<style>.p5{ display:block; padding:1rem; margin:1rem; border:1px solid black;}</style>
<div class='p5' id='src_div' onclick="set_value('src_div','tgt_div')">Weebles wobble but they don't fall down!</div>
<div class='p5' id='tgt_div'></div>
Or you can use a link to set the value

you should try to avoid writing inline event.try this:
<style>
#getCredits {
background: #CCC;
}
</style>
<div id="beta">0.00</div>
<div id="availablecredits">500</div>
<div id="getCredits">Click here to get available credits</div>
<script>
document.getElementById('getCredits').addEventListener("click",function(){
document.getElementById('beta').innerHTML=document.getElementById('availablecredits').innerHTML;
});
</script>
Why inline css and javascript are bad:http://robertnyman.com/2008/11/20/why-inline-css-and-javascript-code-is-such-a-bad-thing/

The .val() method is sometimes useful:
var input = $("#Input").val();

jQuery :has selector filter trouble

I have some containers with ids="container1", "container2", "container3"...
They can have one of two types of tags inside: tables or canvas.
I want to hide one of them depending on the device orientation.
I have tried with this
$('[id^=container]:has(canvas)').hide();
or
$('[id^=container]:has(table)').hide();
but both hide all the containers, don't filtering their inside tags.

You can do
var x = $('[id^=container]').find("table").length;
// Will be 0 if no table inside it
if(x==0) { .. }
else { .. }

You can use classes on your containers instead of ids. Here's a JSFiddle demo.
For better performance in modern browsers, use $( "your-pure-css-selector" ).has( selector/DOMElement ) instead.
Source: https://api.jquery.com/has-selector/
Basically I made a 3 containers. One with a table, one with a canvas and one with nothing.
<div class="container green">
<table></table>
</div>
<div class="container blue">
<canvas></canvas>
</div>
<div class="container red"></div>
And a quick CSS to have the divs visible.
div.container{
display: inline-block;
height: 50px;
margin: 10px;
width: 50px;
}
div.green{
background-color: green;
}
div.blue{
background-color: blue;
}
div.red{
background-color: red;
}
And to complete it, a jQuery that executes when the document is ready.
$(document).ready(function(){
$('div.container').has('canvas').hide();
});

If you know the element by which you want to grab the container is not nested within additional tags, you can use the parentNode property of an HTML element to climb up the DOM tree and hide the parent.
document.querySelector("[id^=container] > table").parentNode.style.display= "none";
Example that demos the concept:
document.getElementById("input").addEventListener("change", function() {
document.getElementById("container1").style.display = "block";
document.getElementById("container2").style.display = "block";
document.querySelector("[id^=container] > " + this.value).parentNode.style.display = "none";
});
#container1 {
border: 1px solid red;
}
#container2 {
border: 1px solid blue;
}
<select id="input">
<options>
<option value="table">Hide the table</option>
<option value="canvas">Hide the canvas</option>
</options>
</select>
<div id="container1">Table
<table></table>
</div>
<div id="container2">Canvas
<canvas></canvas>
</div>

I didn't realized I had a global container with id= "container*".
What a silly mistake. Sorry for stealing your time, and thank you everyone!