Fixed position but relative to container

Question

I am trying to fix a div so it always sticks to the top of the screen, using:

position: fixed;
top: 0px;
right: 0px;

However,

Answer 1

The answer is yes, as long as you don't set left: 0 or right: 0 after you set the div position to fixed.

http://jsfiddle.net/T2PL5/85/

Checkout the sidebar div. It is fixed, but related to the parent, not to the window view point.

body {
  background: #ccc;
}

.wrapper {
  margin: 0 auto;
  height: 1400px;
  width: 650px;
  background: green;
}

.sidebar {
  background-color: #ffffd;
  float: left;
  width: 300px;
  height: 100px;
  position: fixed;
}

.main {
  float: right;
  background-color: yellow;
  width: 300px;
  height: 1400px;
}

<div class="wrapper">wrapper
  <div class="sidebar">sidebar</div>
  <div class="main">main</div>
</div>

Answer 2

/* html */

/* this div exists purely for the purpose of positioning the fixed div it contains */
<div class="fix-my-fixed-div-to-its-parent-not-the-body">

     <div class="im-fixed-within-my-container-div-zone">
          my fixed content
     </div>

</div>



/* css */

/* wraps fixed div to get desired fixed outcome */
.fix-my-fixed-div-to-its-parent-not-the-body 
{
    float: right;
}

.im-fixed-within-my-container-div-zone
{
    position: fixed;
    transform: translate(-100%);
}

Answer 3

I did something like that awhile back. I was pretty new to JavaScript, so I'm sure you can do better, but here is a starting point:

function fixxedtext() {
    if (navigator.appName.indexOf("Microsoft") != -1) {
        if (document.body.offsetWidth > 960) {
            var width = document.body.offsetWidth - 960;
            width = width / 2;
            document.getElementById("side").style.marginRight = width + "px";
        }
        if (document.body.offsetWidth < 960) {
            var width = 960 - document.body.offsetWidth;
            document.getElementById("side").style.marginRight = "-" + width + "px";
        }
    }
    else {
        if (window.innerWidth > 960) {
            var width = window.innerWidth - 960;
            width = width / 2;
            document.getElementById("side").style.marginRight = width + "px";
        }
        if (window.innerWidth < 960) {
            var width = 960 - window.innerWidth;
            document.getElementById("side").style.marginRight = "-" + width + "px";
        }
    }
    window.setTimeout("fixxedtext()", 2500)
}

You will need to set your width, and then it gets the window width and changes the margin every few seconds. I know it is heavy, but it works.

Answer 4

The magic is to take the screen width minus the container width and divide it by 2:

//1400px is according to container max-width (left can be also right)
.fixed {
  position: fixed;
  right: calc((100vw - 1400px)/2);
}

Note: css calc() function is almost, but not 100% supported. For most use-cases it is definitely supported enough. Click here for more details

Snippet (with a 300px container just to fit this website's widget):

.container {
  max-width: 300px;
  margin-left: auto;
  margin-right: auto;
}


.fixed {
  position: fixed;
  right: calc((100vw - 300px)/2);
}


@media screen and (max-width: 300px) {
  right: 0px;
}

<div style="height: 3000px">
    <div class="container">
        <button class="fixed">
            FIXED CONTENT
        </button>
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    </div>
 </div>

Answer 5

You can give a try to my jQuery plugin, FixTo.

Usage:

$('#mydiv').fixTo('#centeredContainer');

Answer 6

My project is .NET ASP Core 2 MVC Angular 4 template with Bootstrap 4. Adding "sticky-top" into main app component html (i.e. app.component.html) on the first row worked, as follows:

<div class='row sticky-top'>
    <div class='col-sm-12'>
        <nav-menu-top></nav-menu-top>
    </div>
</div>
<div class="row">
    <div class='col-sm-3'>
        <nav-menu></nav-menu>
    </div>
    <div class='col-sm-9 body-content'>
        <router-outlet></router-outlet>
    </div>
</div>

Is that the convention or did I oversimplify this?