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How to change fixed button to change BG color if its scrolled over sections that has same color?

Basically, i have fixed button on bottom that scrolls over the page on mobile. The color of button is yellow and i want when the button scrolls over sections that are same color as button, to get additional class or change style directly inline and set BG color to white.
Is it possible with Observer or something similar?
Thanks!

The trouble with trying to use the Intersection Observer API in this case is twofold:
The yellow sections are not ancestors of the button, they're likely siblings.
The Intersection Observer API provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element...
The button is position: fixed, which doesn't play nicely with the internals of the API: Intersection observer does not work with target with position: fixed.
The old-school way of doing this would be to check the bounding box of the button against the bounding boxes of the yellow sections each time the page is scrolled.
That means calling Element.getBoundingClientRect() once for the button (it's bounding box should never change because it's position: fixed relative to the viewport) and once for each yellow section each time the scroll event is raised.
Here's a sample showing this approach:
const button = document.getElementById('some-action');
const buttonRect = button.getBoundingClientRect();
const yellowDivs = document.querySelectorAll('div.yellow');
const areIntersecting = (bounds1, bounds2) =>
bounds1.top < bounds2.bottom && bounds1.bottom > bounds2.top;
document.addEventListener('scroll', () => {
/* Use for...of, not .forEach so we can
return early. */
for (let item of yellowDivs) {
const itemRect = item.getBoundingClientRect();
if (areIntersecting(itemRect, buttonRect)) {
button.classList.add('white');
button.classList.remove('yellow');
/* We don't care how many yellow divs the button
is intersecting. Once we've found one, we can
return so we're not computing the rectangles
of the rest. */
return;
}
/* If none of the yellow divs were interecting,
reset the color of the button. */
button.classList.add('yellow');
button.classList.remove('white');
}
});
div.blue, div.white, div.yellow { height: 250px; }
.blue { background-color: blue; }
.white { background-color: white; }
.yellow { background-color: yellow; }
#some-action {
position: fixed;
top: 20px;
right: 20px;
padding: 10px 20px;
}
<div class="blue"></div>
<div class="yellow"></div>
<div class="white"></div>
<div class="blue"></div>
<div class="yellow"></div>
<div class="white"></div>
<div class="blue"></div>
<div class="yellow"></div>
<div class="white"></div>
<div class="blue"></div>
<div class="yellow"></div>
<div class="white"></div>
<div class="blue"></div>
<div class="yellow"></div>
<div class="white"></div>
<button id="some-action" class="yellow">Some Action</button>

Transition a DIV element while reverting transition on a another element - Using Javascript

I have php generating several DIV tags populated with information for a database.
A DIV height of 400px will display all information. However, I render the DIVs to height=50PX on the page with CSS.
example:
<div style="height: 50px">Info</div>
<div style="height: 50px">Info</div>
<div style="height: 50px">Info</div>
<div style="height: 50px">Info</div>
etc
I need some help with javascript method and functions, that will run when I click on the DIV element, the function should change the style.property.height to 400px and simultaneously reduce any other div that was expanded to 400px back to 50px. When the DIV is action i.e. it's at 400px, it should NOT change no matter how many time it's clicked on, but once click out of the DIV or another div it should revert to 50px

You can give all the divs the same class to select them by (with document.querySelectorAll) to change their styles. You can loop through all of the divs with Array.prototype.forEach to change their heights back to 50px. JSFiddle: http://jsfiddle.net/s5dLpjkg/embedded/result
var divs = document.querySelectorAll(".myClass");
var input = document.getElementById("num");
document.getElementById("transitionBtn").addEventListener("click", function(e){
var num = input.value;
var div = divs[num-1];
[].slice.call(divs).forEach(function(el){
if(el.style.height!=="50px"&&el!==div){
el.style.height = "50px";
}
});
div.style.height="200px";
});
.myClass{
background-color: dodgerblue;
border: 1px solid black;
transition: height 2s;
}
<div style="height: 50px" class="myClass">Info #1</div>
<div style="height: 50px" class="myClass">Info #2</div>
<div style="height: 50px" class="myClass">Info #3</div>
<div style="height: 50px" class="myClass">Info #4</div>
<input type="number" id="num" placeholder="Div number" min="1" max="4" style="width: 30%" value="1">
<p/>
<button id="transitionBtn">Run Transition</button>

Cannot get push menu inline with Bootstrap

I'm using Bootstrap as UI framework, what I'm trying to do is make a push menu on the left. Actually, I almost achieve this result, but there are some bugs on the system. In particular, I'm not able to get the menu inline. See the code for more details:
HTML
<div id="calendar-wrapper">
<div class="container-fluid">
<div class="row">
<div id="resource-bar" class="sidenav col-sm-2">
<h4>Resource</h4>
<div class="input-group">
<input type="text" placeholder="Search resource"
class="form-control resource-filter"/>
<span class="input-group-btn">
<button class="clear btn btn-default clean-resource btn-danger" type="button">
<span class="glyphicon glyphicon-remove"></span>
</button>
</span>
</div>
<div id="popover-content" hidden></div>
</div>
<div id="calendar-container" class="col-sm-10">
<div id="calendar" class="well"></div>
</div>
</div>
</div>
</div>
<br><br><br>
<button type="button" id="show" >Show</button>
<button type="button" id="hide" >Hide</button>
Note that the html above is adapted for a fiddle example.
CSS
.sidenav
{
background-color: azure;
height: 100%;
width: 0;
z-index: 1;
top: 0;
left: 0;
overflow-x: hidden;
transition: 0.5s;
}
#calendar-container
{
background-color: whitesmoke;
transition: margin-left .5s;
padding: 16px;
}
JS
$(document).ready(function()
{
var resourceContainer = $('#resource-bar');
var calendarContainer = $('#calendar-container');
$('#show').click(function()
{
resourceContainer.css('width', '250px');
calendarContainer.css('margin-left', '250px');
});
$('#hide').click(function()
{
resourceContainer.css('width', '0px');
calendarContainer.css('margin-left', '0px');
});
})
The result when the menu on the left is closed:
Seems that both divs are inline, the problem occurs when I press show button and the menu appears:
BUG actually noticed:
When the menu is opened I get the divs in two line instead of one row
Adding the class col-sm-2 to resource-bar the overflow-x: hidden; doesn't working, in fact, seems that the menu is visible when it should be closed.
col-sm-2 does not go in another line when the minimum resolution of the screen doesn't have enough space in width.
Someone could help me to fix this issues? Thanks. JSFIDDLE.

Edited to another workaround which wouldn't affect bootstrap grid:
With this setup sidebar would be absolute, since it's out of viewport and you set it to a fixed width (250px), using the grid wouldn't be necessary.
Visible input will not overflow once sidebar shows.
Raised buttons above sidebar.
Note the HTML structure was tweaked.
$(document).ready(function() {
var resourceContainer = $('#resource-bar');
var calendarContainer = $('#calendar-container');
$('#show').click(function() {
resourceContainer.css('width', '250px');
calendarContainer.css('margin-left', '250px');
});
$('#hide').click(function() {
resourceContainer.css('width', '0px');
calendarContainer.css('margin-left', '0px');
});
})
div.sidenav {
background-color: azure;
height: 100%;
width: 0;
z-index: 1;
top: 0;
left: 0;
overflow-x: hidden;
transition: 0.5s;
/* added absolute to sidenav since it will have fixed width anyways */
position: absolute;
}
#calendar-container {
background-color: whitesmoke;
transition: margin-left .5s;
padding: 16px;
/* this is just to vertically align with sidebar input */
padding-top: 36px;
}
button {
position: relative;
z-index: 2;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div id="calendar-wrapper">
<div class="container-fluid">
<div class="row">
<div id="calendar-container" class="col-sm-12">
<div id="calendar" class="well"></div>
</div>
<div id="resource-bar" class="sidenav">
<h4>Resource</h4>
<div class="input-group">
<input type="text" placeholder="Search resource" class="form-control resource-filter" />
<span class="input-group-btn">
<button class="clear btn btn-default clean-resource btn-danger" type="button">
<span class="glyphicon glyphicon-remove"></span>
</button>
</span>
</div>
<div id="popover-content" hidden></div>
</div>
</div>
</div>
</div>
<br>
<br>
<br>
<button type="button" id="show">Show</button>
<button type="button" id="hide">Hide</button>

You're issue lies with the mix of bootstrap and your own JavaScript generated style. It seems you already have knowledge of the Bootstrap Grid layout, but to reinforce, https://v4-alpha.getbootstrap.com/layout/grid/ will tell you that there are 12 columns in a row.
Each column is styled by Bootstrap to a set width with set margins in between. You've have all 12 columns filled up in your row. As you add an additional margin to your already-filled-up calendarContainer column, it will pop out of the row.
Therefore, the easiest way to achieve what you want without affecting any other styles is too make your column smaller and reduce the amount of 'margin-left' you push on the column like so https://jsfiddle.net/Zeenglishking/DTcHh/28837/
<div id="calendar-container" class="col-sm-8">
<div id="calendar" class="well"></div>
</div>
$('#show').click(function()
{
resourceContainer.css('width', '250px');
calendarContainer.css('margin-left', '50px');
});
Also, as you say "seems infact that the menu is even visible also when is closed.", the menu is indeed visible. This is again down to the fact of the bootstrap styling of the grid-layout. If you can figure out what styles are creating this issue (F12), you can override them using "something:!important". https://css-tricks.com/snippets/css/style-override-technique/ . Otherwise, find another way. If you mess around with css positioning elements too much, it's easy to get lost and jumbled with the rest of your code.
EDIT (in regard to comment):
What needs to be used in addition to this is 'col-xs-**' with a smaller size column, allowing for a responsive design and for it to work on the smaller viewports such as the one in JSFiddle. I have updated my fiddle to include
col-xs-1
and
col-xs-4
on resource-bar and calendar-container respectively. This will change the size of the column, upon resize of the screen/viewport to ensure it doesn't drop down on extra-small viewports. More info at http://getbootstrap.com/css/#grid-options
Upon using Bootstrap framework you almost acquire yourself to a certain standard. Shortcuts in fixing this can cause problems with other elements. You're probably best to read more into it before chucking random positioning in to fix certain elements on a page.

positioning 3 divs in a div

i'm facing to css problem.basically i have main div tag and 3 div s class named pic_con,body_con and msg_con .
div msg_con length and height depend on the text of it.if text is too long it should have morethan one line to display all.look at the picture.first one with small text,second one with big text ..div msg_con have minimem width and maximum width.
i want to position this 3 div look like in the picture.
<div id="apDiv1">
<div id="div_id_1" class="msg_w_1">
<div class="pic_con">
<div class="body_con">small icon"</div>
<div class="msg_con">hi</div>
</div>
<div id="div_id_2" class="msg_w_1">
<div class="pic_con">
<div class="body_con">small icon"</div>
<div class="msg_con">hey this is multiline text</div>
</div>
</div>
my css
.pic_con {
float:left;
background-color:#096;
}
.back_con {
float:left;
background-color:#3CC;
border:5px solid red;
width:150;
}
.body_con {
/*float:left;*/
margin:0 auto 0 auto;
background-color:#C39;
border:5px solid red;
}
i set flote left but it's not work.

As far as I understood you want to align them one after another.
You can manage this, as you tried, by using float: left. Furthermore, you should set the parent div to clear: both.
Another thing that I saw is that you didn't close the pic-con DIVs. Try with this:
HTML
<div id="apDiv1">
<div id="div_id_1" class="msg_w_1">
<div class="pic_con">pic</div>
<div class="body_con">small icon</div>
<div class="msg_con">hi</div>
</div>
<div id="div_id_2" class="msg_w_1">
<div class="pic_con"></div>
<div class="body_con">small icon"</div>
<div class="msg_con"> hey this is multiline text</div>
</div>
</div>
CSS
.msg_w_1 {
clear: both;
}
.msg_w_1 div {
float: left;
}
Edit: I didn't see the updated post containing CSS when I posted this. Try removing the float: left and width from your CSS classes before trying this

use display:table style.
.msg_con {
display : table
}
this makes .msg_con behave like a table element, it will re-size according to its content's length ( both height and width ).

Moving html element containing contentEditable to another branch in dom without losing focus

I hope you can help with this problem.
I have the following html structure (simplified) which represents two fixed-height pages in a document with headers, footers, a body and a number of "DataItems" (3 readonly, 1 editable) within that body. There are also a "Summary" and "Add New" DataItems.
I need to be able to move a DataItem's block of html (that may contain a contentEditable element) into another position in the document. However, I need to do so without losing focus to the contentEditable element if it is that which is being moved.
This action is triggered whilst the user is typing into the contentEditable HTML Editor and the DataItem that they are typing into gets taller. As it does so, when the bottom DataItem starts to overlap the footer, it gets pushed down to the next page. A bit like typing into a table cell in MS Word that isn't allowed to break across pages.
I can get a partial solution working with jQuery. This moves next sibling DataItems from the first page to the second page as a previous sibling grows in height, but the problem with this is that when I then go to move the DataItem which has focus, it loses focus and breaks the user's flow of typing. I have tried putting focus back to the contentEditable div after moving it, but issues with selection and range and not being able to find the cursor position plus issues with the scrollbars jumping despite them being reset back have proved that solution to be too unreliable.
I therefore tried a different approach which was to move all html content between the last DataItem of the first page and the first DataItem (if any) of the next page to a position before the last data item, in the hope that doing so would prevent the html content editor from losing focus, but still give the impression that the DataItem has moved down to the second page.
The functionality I've tried (and failed) to achieve is to cut the html between the "start-here" and "end-here" divs and move it to the "paste-here" div. The divs are just there as placeholders to show what should be moved.
However, despite trying various methods using jQuery dom manipulation and RegEx string replacement I can't seem to come up with a solution that doesn't involve replacing the common ancestor - which is the "Pages" div - and hence having to replace the current contentEditable - and hence losing focus.
Does anyone have an idea of how I could do this and retain focus so the user can continue typing uninterrupted?
Regards,
Jeremy :)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style>
.Document
{
text-align:left;
margin: 0px auto;
display:inline-block;
position:relative;
/*border: 1px solid blue;*/
}
.Pages
{
margin: 0px auto;
position:relative;
display:inline-block;
/*border: 1px solid yellow;*/
}
.PortraitPage
{
height:29.7cm;
width:21cm;
background: #ffffff;
position:relative;
}
.FirstPage
{
border: 1px dotted black;
}
.ExtraPage
{
margin-top:10px;
margin-bottom:10px;
border: 1px dotted black;
}
.PageHeader
{
border: 0px dotted #e2e2e2;
position:absolute;
top:0px;
width: 18cm;
left:0cm;
}
.PageBody
{
border: 1px dotted #c2c2c2;
position:absolute;
top:4.5cm; /* this needs to be whatever the height of the header is */
width: 18cm;
left:1.5cm;
/*min-height:22cm;*/
}
.PageFooter
{
border: 1px dotted #e2e2e2;
position:absolute;
bottom:0px;
width: 18cm;
left:1.5cm;
}
.PageSeparator
{
background: #999999;
height: 1cm;
width: 21cm;
}
.InvoiceItemsForm
{
position: relative;
/*top: 2.5cm;*/
}
/* This prevents the space added in contentcell divs in the html entry cell just for the PageEditor */
.InvoiceItemsForm div
{
margin-bottom: 0px;
}
.LineItem_Panel_ReadOnly
{
position:relative;
border: 1px solid transparent;
}
.LineItem_Panel_ReadOnly_Hover
{
position:relative;
border: 1px solid #C2C2C2;
background-color:#ffffff;
}
.LineItem_Panel_Edit
{
position:relative;
border: 1px solid #C2C2C2;
}
.LineItem_Panel_Insert
{
position:relative;
border: 1px solid green;
}
</style>
</head>
<body>
<div id="ctl00_phContent_pnlInvoicePage" class="Page FirstPage PortraitPage">
<div class="FirstHeader PageHeader">
First Page Header
</div>
<div class="ExtraHeader HiddenExtraPageSection">
Hidden ExtraPage Header that is copied when a new page is created
</div>
<div id="ctl00_phContent_pnlInvoicePageBody" class="PageSection Body PageBody">
<div id="ctl00_phContent_pnlInvoiceItemsForm" class="InvoiceItemsForm DataSection">
<div id="ctl00_phContent_lvLineItems_ctrl0_pnlLineItemReadOnly" class="DataItem LineItem_Panel_ReadOnly InvoiceLineItem">
<div class="LineItem_Panel_HTMLContent">
<span id="ctl00_phContent_lvLineItems_ctrl0_lblHTMLContent">
<p>
aaaaaaaaaaaaaaa</p>
<p>
aaaaaaaaaaaaaa</p>
</span>
</div>
</div>
<div id="ctl00_phContent_lvLineItems_ctrl1_pnlLineItemReadOnly" class="DataItem LineItem_Panel_ReadOnly InvoiceLineItem">
<div class="LineItem_Panel_HTMLContent">
<span id="ctl00_phContent_lvLineItems_ctrl1_lblHTMLContent">
<p>
bbbbbbbbbbbbbbb</p>
<p>
bbbbbbbbbb</p>
</span>
</div>
</div>
<div id="ctl00_phContent_lvLineItems_ctrl2_pnlLineItemReadOnly" class="DataItem LineItem_Panel_ReadOnly InvoiceLineItem">
<div class="LineItem_Panel_HTMLContent">
<span id="ctl00_phContent_lvLineItems_ctrl2_lblHTMLContent">cccccccccccccc</span>
</div>
</div>
<div id="ctl00_phContent_lvLineItems_ctrl3_pnlLineItemEdit" class="DataItem LineItem_Panel_Edit InvoiceLineItem">
<div id="ctl00_phContent_lvLineItems_ctrl3_pnlHTMLEditor" class="HTMLEditorPanel">
<div style="width: 126px; height: 20px;" id="ctl00_phContent_lvLineItems_ctrl3_txtHTMLContent$HtmlEditorExtenderBehavior_ExtenderContainer"
class="unselectable ajax__html_editor_extender_container">
<input style="display: none; visibility: hidden;" id="ctl00_phContent_lvLineItems_ctrl3_txtHTMLContent"
name="ctl00$phContent$lvLineItems$ctrl3$txtHTMLContent" value="ddddddddddddd"
type="text" autocomplete="off">
<div style="height: 21px; overflow: auto; clear: both;" id="ctl00_phContent_lvLineItems_ctrl3_heeHTMLContent_ExtenderContentEditable"
class="ajax__html_editor_extender_texteditor" contenteditable="true">
<p>
ddddddddddddd</p>
<p>
</p>
</div>
</div>
</div>
</div>
<div class="DataItem">
<p>
Click <a id="ctl00_phContent_lvLineItems_lbAddLineItem" href='javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$phContent$lvLineItems$lbAddLineItem", "", true, "", "", false, true))'>
here</a> to add a new Data Item</p>
</div>
<div id="paste-here"></div>
<div class="DataItem InvoiceTotals">
<div class="InvoiceSubTotal">
Sub Total: <span id="ctl00_phContent_lvLineItems_lblInvoiceSubTotal">18,110.00</span></div>
<div class="InvoiceVATTotal">
VAT Total: <span id="ctl00_phContent_lvLineItems_lblInvoiceVATTotal">3,111.00</span></div>
<div class="InvoiceTotal">
Invoice Total: <span id="ctl00_phContent_lvLineItems_lblInvoiceTotal">21,221.00</span></div>
</div>
<div id="start-cut"></div>
</div>
</div>
<div class="FirstFooter PageFooter">
First Page Footer
</div>
<div class="ExtraFooter HiddenExtraPageSection">
Hidden ExtraPage Footer that is copied when a new page is created
</div>
</div>
<div id="ctl00_phContent_pnlInvoicePage" class="Page ExtraPage PortraitPage">
<div class="ExtraHeader PageHeader">
Extra Page Header
</div>
<div id="ctl00_phContent_pnlInvoicePageBody" class="PageSection Body PageBody">
<div id="ctl00_phContent_pnlInvoiceItemsForm" class="InvoiceItemsForm DataSection">
<div id="end-cut"></div>
</div>
</div>
<div class="ExtraFooter PageFooter">
Extra Page Footer
</div>
</div>
</body>
</html>

I don't see any reason you have to reparent anything to achieve the effect you want. Instead of trying to rely on the browser being smart enough to render things where you want them, which will prove to be inconsistent between browsers and possibly different versions of the same browser, I would suggest using CSS and javascript to explicitly position the items. When the text the user enters gets too long to fit in the space provided, you can use node.style.top=newY; node.style.left=newX; to reposition it, and node.style.height=newHeight; node.style.width=newWidth; to resize it however large it needs to be. These methods don't require the browser to remove and re-insert the element, so focus is not lost, nor is text selection or cursor position.