Chapter 224: Draggable.hitTest()

Core Idea

Static helper that tests whether one object overlaps another (or the pointer), by a configurable overlap threshold.

Reference Tables

Parameter	Type	Description
testObject	Object	element, mouse/touch event (with pageX/pageY), selector string, or {top,left,right,bottom} rect
threshold	Number | String	default 0 (any overlap); a pixel count, or a percentage string like "50%" of overlapping area

Returns: Boolean.

Code Examples

if (Draggable.hitTest("#dropzone", "50%")) {
  // dragged element overlaps the dropzone by at least 50%
}

• What it demonstrates: the common drag-and-drop pattern of checking overlap against a target zone inside onDragEnd.

Connects To

• Draggable (onDragEnd callback): typical place to call hitTest() to decide whether a drop was successful.