Resizing a Layer (W3C) : Layer « HTML « JavaScript DHTML
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Resizing a Layer (W3C)
/*
JavaScript Bible, Fourth Edition
by Danny Goodman
John Wiley & Sons CopyRight 2001
*/
<HTML>
<HEAD>
<TITLE>Layer Resizing</TITLE>
<SCRIPT LANGUAGE="JavaScript">
var engaged = false
var offsetX = 0
var offsetY = 0
function resizeIt(evt) {
evt = (evt) ? evt : (window.event) ? window.event : ""
var targElem = (evt.target) ? evt.target : evt.srcElement
if (targElem.className == "draggable") {
if (engaged) {
if (evt.pageX) {
targElem.style.width = (evt.pageX - targElem.offsetLeft - offsetX) + "px"
targElem.style.height = (evt.pageY - targElem.offsetTop - offsetY) + "px"
} else {
var elemWidth = evt.clientX - targElem.offsetLeft - offsetX -
(parseInt(targElem.style.left) - parseInt(targElem.offsetLeft))
var elemHeight = evt.clientY - targElem.offsetTop - offsetY -
(parseInt(targElem.style.top) - parseInt(targElem.offsetTop))
targElem.style.width = elemWidth + "px"
targElem.style.height = elemHeight + "px"
}
}
}
}
function engage(evt) {
evt = (evt) ? evt : (window.event) ? window.event : ""
var targElem = (evt.target) ? evt.target : evt.srcElement
if (targElem.className == "draggable") {
while (targElem.id != "myLayer" && targElem.parentNode) {
targElem = targElem.parentNode
}
if (targElem.id == "myLayer") {
if (evt.pageX && (evt.pageX > ((parseInt(targElem.style.width) - 20) +
targElem.offsetLeft)) && (evt.pageY >
((parseInt(targElem.style.height) - 20) + targElem.offsetTop))) {
offsetX = evt.pageX - parseInt(targElem.style.width) - targElem.offsetLeft
offsetY = evt.pageY - parseInt(targElem.style.height) - targElem.offsetTop
engaged = true
} else if ((evt.offsetX > parseInt(targElem.style.width) - 20) && (evt.offsetY >
parseInt(targElem.style.height) - 20)) {
offsetX = evt.offsetX - parseInt(targElem.style.width) - document.body.scrollLeft
offsetY = evt.offsetY - parseInt(targElem.style.height) - document.body.scrollTop
engaged = true
if (navigator.userAgent.indexOf("Win") == -1) {
offsetX += document.body.scrollLeft
offsetY += document.body.scrollTop
}
}
return false
}
}
}
function release(evt) {
evt = (evt) ? evt : (window.event) ? window.event : ""
var targElem = (evt.target) ? evt.target : evt.srcElement
if (targElem.className == "draggable") {
while (targElem.id != "myLayer" && targElem.parentNode) {
targElem = targElem.parentNode
}
if (engaged && targElem.id == "myLayer") {
engaged = false
}
}
}
</SCRIPT>
</HEAD>
<BODY>
<H1>Resizing a Layer (W3C)</H1>
<HR>
<DIV ID="myLayer" CLASS="draggable" STYLE="position:absolute; top:170; left:100;
width:300; height:190; background-color:lightblue">
<SPAN>Here is some content inside the layer. See what happens to it as you
resize the layer via the bottom-right 20-pixel handle.</SPAN>
</DIV>
<SCRIPT LANGUAGE="JavaScript">
document.onmousedown = engage
document.onmouseup = release
document.onmousemove = resizeIt
document.onmouseout = release
</SCRIPT>
</BODY>
</HTML>
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