```div-parameter ## Parameter Layer | Parameter | Format | Default | Mandatory | Description | | --- | --- | :---: | :---: | --- | | backdrop |
<Object> = PlainObject
<Boolean> = false |
policy:
"click-thru"
add_bounce_class:
true
content:
null | no | Set to *true* if a backdrop should be added to the DOM tree | | add_bounce_class | - | - | no | If added, a bounce class will be added and after a css transition removed to the layer, if the user clicks on a modal backdrop the bounce class defaults to "cui-layer-bounce".
*Deprecated: Use backdrop.add_bounce_class instead* | handle_focus |
<Boolean> | true | no | Handle focus on tab index.
true
false
| | pointer |
<String> = "arrow" | - | no | A rectangle box to position the layer to a pointer is a helper to show the position of the layer. | | placement |
<String> | - | no | The preferred placement | | placements |
<Array>
if CUI.Layer.knownPlacements.indexOf(a) == -1 return false | - | no | Lorem | element |
isElement
isElement(v?.DOM) | - | no | Element to position the layer to. | | use_element_width_as_min_width | dt><Boolean> | false | no |
true
false
| | show_at_position |
<Object> = PlainObject
*and* top >= 0 *and* left >= 0 | - | no | Lorem | | fill_space |
<String> =
"auto" | "both" | "horizontal" | "vertical" | "auto" | yes | Fills the available space to the maximum. If used with "placement", the placement is not chosen
auto>
Check if width or height is already set, use the other.
both
Overwrite width and height, no matter what.
horizontal
Stretch width only.
vertical
Stretch height only. | | check_for_element |
<Boolean> | false | no |
true
The layer when shown checks if the "element" is still in the DOM tree.
false
| show_ms |
<Integer> > 0 | 700 | no | Lorem | | hide_ms |
<Integer> > 0 | 100 | no | Lorem | | visible |
<Boolean> | - | no |
true
false
  | ## Callbacks Layer | Callback | Format | Default | Mandatory | Description | | --- | --- | :---: | :---: | --- | | onBeforeShow |
function() | - | no | Lorem | | onShow |
function() | - | no | Lorem | | onPosition |
function() | - | no | Lorem | | onHide |
function() | - | no | Lorem | ``` @@include(../../core/dom/dom_p.md)