JavaScript Examples Bible - UserWorks Technologies

Chapter 1 ✦ Generic HTML Element Objects (Chapter 15)
// set global var to a reference to dragged element
function setSelectedObj() {
var imgObj = window.event.srcElement
if (imgObj.id.indexOf(“map”) == 2) {
selectedObj = imgObj
bringToFront(selectedObj)
return
}
selectedObj = null
return
}
// do the dragging (called repeatedly by onMouseMove)
function dragIt() {
if (selectedObj) {
shiftTo(selectedObj, (event.clientX - offsetX), (event.clientY -
offsetY))
return false
}
}
// set global vars and turn on mousemove trapping (called by onMouseDown)
function engage() {
setSelectedObj()
if (selectedObj) {
document.onmousemove = dragIt
offsetX = window.event.offsetX - document.body.scrollLeft
offsetY = window.event.offsetY - document.body.scrollTop
}
}
// restore everything as before (called by onMouseUp)
function release() {
if (selectedObj) {
document.onmousemove = null
selectedObj = null
}
}
onMouseMove Event Handler
Click and drag the images:
119
elementObject.onMouseMove