The onmousemove property returns the mousemove event handler code on the current element.
Syntax
element.onmousemove = event handling code
Notes
The mousemove event is raised when the user moves the mouse.
Examples
Example #1: tooltips
The following example shows the use of the onmousemove event with a javaScript tooltip.
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Tooltip Example</title>
<script type="text/javascript">
var oTooltip = new (function() {
var nOverX, nOverY, nLeftPos, nTopPos, oNode, bOff = true;
this.follow = function (oMsEvnt1) {
if (bOff) { return; }
var nMoveX = oMsEvnt1.clientX, nMoveY = oMsEvnt1.clientY;
nLeftPos += nMoveX - nOverX; nTopPos += nMoveY - nOverY;
oNode.style.left = nLeftPos + "px";
oNode.style.top = nTopPos + "px";
nOverX = nMoveX; nOverY = nMoveY;
};
this.remove = function () {
if (bOff) { return; }
bOff = true; document.body.removeChild(oNode);
};
this.append = function (oMsEvnt2, sTxtContent) {
oNode.innerHTML = sTxtContent;
if (bOff) { document.body.appendChild(oNode); bOff = false; }
var nScrollX = document.documentElement.scrollLeft || document.body.scrollLeft, nScrollY = document.documentElement.scrollTop || document.body.scrollTop, nWidth = oNode.offsetWidth, nHeight = oNode.offsetHeight;
nOverX = oMsEvnt2.clientX; nOverY = oMsEvnt2.clientY;
nLeftPos = document.body.offsetWidth - nOverX - nScrollX > nWidth ? nOverX + nScrollX + 10 : document.body.offsetWidth - nWidth + 16;
nTopPos = nOverY - nHeight > 6 ? nOverY + nScrollY - nHeight - 7 : nOverY + nScrollY + 20;
oNode.style.left = nLeftPos + "px";
oNode.style.top = nTopPos + "px";
};
this.init = function() {
oNode = document.createElement("div");
oNode.className = "tooltip";
oNode.style.position = "absolute";
};
})();
</script>
<style type="text/css">
div.tooltip {
padding: 6px;
background: #ffffff;
border: 1px #76808C solid;
border-radius: 5px;
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
z-index: 9999;
}
</style>
</head>
<body onload="oTooltip.init();">
<p><a href="https://developer.mozilla.org/" onmouseover="oTooltip.append(event,'Example text 1');" onmousemove="oTooltip.follow(event);" onmouseout="oTooltip.remove();">Move your mouse here…</a></p>
<p><a href="https://developer.mozilla.org/" onmouseover="oTooltip.append(event,'Example text 2');" onmousemove="oTooltip.follow(event);" onmouseout="oTooltip.remove();">…or here!!</a></p>
</body>
</html>
Example #2: draggable elements
The following example shows the use of the onmousemove event with draggable objects.
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Draggable elements</title>
<script type="text/javascript">
(function () {
var
oActive, nMouseX, nMouseY, nStartX, nStartY,
bMouseUp = true, nZFocus = /* the highest z-Index present in your page plus 1: */ 100;
document.onmousedown = function (oPssEvt1) {
var bExit = true, oMsEvent1 = oPssEvt1 || /* IE */ window.event;
for (var iNode = oMsEvent1.target || /* IE */ oMsEvent1.srcElement; iNode; iNode = iNode.parentNode) {
if (iNode.className === "draggable") { bExit = false; oActive = iNode; break; }
}
if (bExit) { return; }
bMouseUp = false;
nStartX = nStartY = 0;
for (var iOffPar = oActive; iOffPar; iOffPar = iOffPar.offsetParent) {
nStartX += iOffPar.offsetLeft;
nStartY += iOffPar.offsetTop;
}
nMouseX = oMsEvent1.clientX;
nMouseY = oMsEvent1.clientY;
oActive.style.zIndex = nZFocus++;
return false;
};
document.onmousemove = function (oPssEvt2) {
if (bMouseUp) { return; }
var oMsEvent2 = oPssEvt2 || /* IE */ window.event;
oActive.style.left = String(nStartX + oMsEvent2.clientX - nMouseX) + "px";
oActive.style.top = String(nStartY + oMsEvent2.clientY - nMouseY) + "px";
};
document.onmouseup = function () {
bMouseUp = true;
};
})();
</script>
<style type="text/css">
.draggable {
position: fixed;
left: 0;
top: 0;
width: auto;
height: auto;
cursor: move;
}
#myDiv {
width: 300px;
height: 200px;
left: 200px;
top: 200px;
background-color: #00ff00;
}
</style>
</head>
<body>
<div class="draggable" id="myDiv"><p>Hello world!</p></div>
<div class="draggable" style="background-color:#aaaaaa;">Another hello world!</div>
</body>
</html>
Specifications
| Specification | Status | Comment |
|---|---|---|
| WHATWG HTML Living Standard The definition of 'onmousemove' in that specification. |
Living Standard |