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How to make top border animated where color goes from left to right

I finished my idea and it works as it is, but it's static and as all developer like, we want to make it better. I have a script where user choose his own top border color for posts(self-developed forum feature).
There is forum post and top border is colored in some color. How can I make it animated. You know when there is a circle and color goes around (it can be different colors) and makes that cool effect (never ending). I don't want something complex as that. I would like a very "simple" concept. Top border color is red (example). Animation starts from left all the way to the right and then repeats. It works like a pulse when heart beats. Like some different color going in that single line, reaching end, stops, repeat.
This is my code:
$(document).ready(function() {
var postDivs = $(".post");
$.each(postDivs, function(index, div) {
var color = ($(".post .postprofile-info")[index].firstChild.nextSibling.data[0] == "#") ? $(".post .postprofile-info")[index].firstChild.nextSibling.data : "#d4d4d4";
$(this).css("border-top", "15px solid " + color);
var element1 = $(".post .postprofile-info ")[index].firstChild;
$(".post .postprofile-info")[index].firstChild.nextSibling.data = "";
element1.style.visibility = "hidden";
});
I know it's quite messy and very badly written but it works :D
Focus here on this line:
$(this).css("border-top", "15px solid " + color);
How can I animate that? I hope I managed to explain myself as best as I could. :)

You can't change the border in the way you would like on the actual element, but you can get the effect using pure CSS (without having to add extra elements to the DOM) by using a before pseudo element.
Here's a simple example in pure HTML/CSS:
div {
height: fit-content;
width: fit-content;
position: relative;
}
div::before {
content: '';
width: 100%;
height: 2px;
background: red;
display: inline-block;
position: absolute;
top: 0;
left: 0;
width: 0;
animation: grow 2s infinite;
}
#keyframes grow {
to {
width: 100%;
}
}
<div>some info</div>

How can I animate an element from a static layout position to an absolute layout position?

I have a form and inside this form a button. Initially the button is statically positioned at its default position based on usual layout. On an event (in the example below, button click) I want to move it to the center of the form through animation and during this animation doing a horizontal flip (using scale transform) and when the animation is in the middle (when the rendered width is 0) changing the contents of the button to a paragraph that once loaded will show an animation probably done with svg and a link.
This snippet does a part of what I want (everything until the second part of the flip with changing the contents and resizing the button to be bigger), but without an initial static position from which to start the animation:
var form = $("form")
var button = $("button")
button.on("click", function(){
var x = (form.outerWidth() - button.outerWidth()) / 2;
var y = (form.outerHeight() - button.outerHeight()) / 2;
button.css({
transform: `translateX(${x}px) translateY(${y}px) scaleX(0)`
});
})
form {
background: #aaa;
border-radius: 4px;
padding: 20px;
font-size: 25px;
transition: all 0.2s;
margin: 0 auto;
width: 300px;
position: relative;
}
button {
background: #0084ff;
border: none;
border-radius: 5px;
padding: 8px 14px;
font-size: 15px;
color: #fff;
position: absolute;
left: 0;
top: 0;
transition: transform 1s;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
<p>Hello World</p>
<button onclick="return false;">Do something</button>
</form>
(https://jsfiddle.net/silviubogan/L1ogpf6a/)
How can I achieve what I want in the most correct manner? Please note that the rest of the form should remain in place.
Thank you.

There's two ways you can do this. First is using setTimeout (reference) with 1000ms as a parameter, since your css animation lasts 1 second, and a callback function that displays the SVG. The second is using jQuery animate (reference) instead of css, and using the parameter complete to show your SVG. Since you are already using css for the animation, let's go with the first option:
button.on("click", function(){
// hide button
window.setTimeout(transform2, 1000);
})
function transform2() {
// change contents
// resize button
}
Example fiddle: https://jsfiddle.net/eynL91qu/

Change font color on scroll based on a div

I am currently coding a simple MENU button that is fixed in the top right of the screen.
With the text it is normally Black, but I want to be able to change the text to White when it is within a certain Div on a page so it is still visible on the dark background images.
I had set up two .CSS classes and tried to get them to switch on scroll but I cannot figure it out.
Anyone know how I can achieve this result?
HTML
<div class="NavigationButton menu_white">
MENU
</div>
CSS
.NavigationButton {
position: fixed;
top: 5%;
right: 5%;
z-index: 99999;
font-family: neuzeit-grotesk, sans-serif;
font-weight: 700;
color: inherit;
}
.menu_white {
color: #fff;
}
.menu_black {
color: #000;
}
(Not My Site) Example site: http://flavinsky.com/home/amaio
Just without the snap scroll
Thanks

You can use jQuery to get the scroll position and toggle the classes based on where the dark background element is. Here is an example
$(document).ready(function(){
$(window).scroll(function(){
var light_pos = $('#white_div').offset().top;
var light_height = $('#white_div').height();
var menu_pos = $('.NavigationButton').offset().top;
var scroll = $(window).scrollTop();
if(menu_pos > light_pos && menu_pos < (light_pos + light_height)) {
$('.NavigationButton').addClass('menu_black');
$('.NavigationButton').removeClass('menu_white');
}
else {
$('.NavigationButton').removeClass('menu_black');
$('.NavigationButton').addClass('menu_white');
}
})
})
and here is a working fiddle https://jsfiddle.net/atqkuwhs/

A possible solution is to get the offset of the div and the menu from the top of the page and apply your wanted changes once they intersect.

Before and After Slider with Multiple Images

I am trying to create a page that has before and after images that use a slider based on mouse movement to show both images. I need to have multiple sliders on the page and can not seem to get them to work. Below are a couple of different examples I have found and the challenges I am having.
http://codepen.io/dudleystorey/pen/JDphy - This works well with mobile but I can not seem to add a second version without adding css for every image since the background image is embedded in the css.
div#inked-painted {
position: relative; font-size: 0;
-ms-touch-action: none;
-webkit-touch-callout: none;
-webkit-user-select: none;
}
div#inked-painted img {
width: 100%; height: auto;
}
div#colored {
background-image: url(https://s3-us-west2.amazonaws.com/s.cdpn.io/4273/colored-panel.jpg);
position: absolute;
top: 0; left: 0; height: 100%;
width: 50%;
background-size: cover;
}
http://codepen.io/ace/pen/BqEer - Here is the other example that does not work as well with mobile. I can add the second image but the slider works all the images simultaneously and not individually when a second image is added.
Can anyone help with adding the second image. I am sure both of these are very workable but I am missing something in my css/javascript knowledge that is not allowing multiple images.

You need to loop though all classes to be able set the eventhandlers individual. Your codepen example could be change to this to work with individual images at once:
var blackWhiteElements= document.getElementsByClassName("black_white");
for (i = 0; i < blackWhiteElements.length; i++) {
initCode($(blackWhiteElements[i]));
}
function initCode($black_white) {
var img_width = $black_white.find('img').width();
var init_split = Math.round(img_width/2);
$black_white.width(init_split);
$black_white.parent('.before_after_slider').mousemove(function(e){
var offX = (e.offsetX || e.clientX - $black_white.offset().left);
$black_white.width(offX);
});
$black_white.parent('.before_after_slider').mouseleave(function(e){
$black_white.stop().animate({
width: init_split
},1000)
});
}
codepen here: http://codepen.io/anon/pen/mJPmKV

Your first attempt is near sufficient.
Assign the background-image inline in the html to avoid extra classes
<div id="colored" style="background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/colored-panel.jpg);"></div>
change background-size on #colored to background-size: auto 100%; to reduce the "shaky" effect
background-size: auto 100%;

Creating a filling animation on transparent image in JavaScript

Given a div that has an image in its background, if this image is transparent (this is an important detail), how can I change its color? Is it possible?
HTML
<body>
<div>
<hr/>
<div id ='imagediv' class="ornament"></div>
</div>
</body>
CSS
body {
margin-top: 100px;
background: url('http://hostmypicture.com/images/fundokairo.png') repeat;
}
hr {
height: 30px;
color: #578daf;
background: url('http://hostmypicture.com/images/barrapreta.png') repeat-x 0 50%;
border: 0;
padding: 0;
margin: 9px 0 0 0;
}
.ornament {
width: 169px;
height: 169px;
background: url('http://s23.postimg.org/6prq112g7/mascara_Fundo_Branco_Kairos.png') 0 50%;
margin: -104px auto 0 auto;
}
ornament is the class of the div.
JavaScript
var divImage = document.getElementById('imagediv');
var divStyle = divImage.currentStyle || window.getComputedStyle(divImage, false);
var divBackImage = divStyle.backgroundImage;
How can the image be filled?
I tried without success to fill the image using fillStyle and fill() of JavaScript. But it seems that using canvas is a possibility.
Fiddle: http://jsfiddle.net/9EFdF/21/
Note: I want the effect of a progress bar, so the color needs to come from underside.

You can simply set a new style for the element like this - note: it will be the transparent parts of the image that will change so in this case if you want the inner part to change color change transparency so that part is transparent:
imagediv.style.backgroundColor = '#000'; //new color
You can chose to use getElementById first, however, elements that has an ID can be referenced directly, but for example's sake:
var el = document.getElementById('imagediv');
el.style.backgroundColor = '#000'; //new color
UPDATED FIDDLE
If you want to keep the image as-is and fill it's inner part the only other option is to use canvas and its composite modes.

If the div is the same size as the background image, you could add a background-color style to the div and the colour would show through the transparent image.