up.viewport [up-anchored=right]

HTML selector

Marks this element as being anchored to the right edge of the screen, such as fixed navigation bars.

Since overlays hide the document scroll bar, elements anchored to the right appear to jump when an overlay opens or closes. Applying this attribute to anchored elements will make Unpoly aware of the issue and adjust the right property accordingly. You may customize this behavior by styling the .up-scrollbar-away class.

Instead of applying this attribute to each affected element, you can also configure a selector in up.viewport.config.anchoredRightSelectors.

Note

Elements with [up-fixed=top] or [up-fixed=bottom] are also considered to be right-anchored.

Example

Here is the CSS for a navigation bar that is anchored to the top edge of the screen:

.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
}

By adding an up-anchored="right" attribute to the element, we can prevent the right edge from jumping when an overlay opens or closes:

<div class="top-nav" up-anchored="right">...</div>