我正在尝试获取父 div 内可拖动 div 左上角的坐标。我可以在父 div 中获取鼠标坐标,这是通过onmousemove
标签完成的。我知道是否有任何类似的标签,例如onmove
用于获取 div 的坐标。我使用的代码如下
<!DOCTYPE html>
<html>
<style>
#parent {
width: 148mm;
height: 160mm;
background-color: yellow;
position: relative;
<!--border: 3px solid #e5e5e5;-->
}
#mydiv {
position: absolute;
z-index: 9;
text-align: center;
border: 1px solid #d3d3d3;
}
#mydivheader {
padding: 10px;
cursor: move;
z-index: 10;
}
</style>
<body>
<div id="parent" style="float:left" onmouseout="clearCoor()">
<div id="mydiv">
<div id="mydivheader" onmove="showCoords(event)"><img src="bc.png" alt="image"></div>
</div>
</div>
<p id="demo"></p>
<script>
//Make the DIV element draggagle:
dragElement(document.getElementById("mydiv"));
function dragElement(elmnt) {
var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
if (document.getElementById(elmnt.id + "header")) {
/* if present, the header is where you move the DIV from:*/
document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
} else {
/* otherwise, move the DIV from anywhere inside the DIV:*/
elmnt.onmousedown = dragMouseDown;
}
function dragMouseDown(e) {
e = e || window.event;
e.preventDefault();
// get the mouse cursor position at startup:
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
// call a function whenever the cursor moves:
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e = e || window.event;
e.preventDefault();
// calculate the new cursor position:
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
let parentElement = elmnt.parentElement;
if(elmnt.offsetTop < 0){elmnt.style.top = "0px"; return;}
if(elmnt.offsetTop > (parentElement.offsetHeight - elmnt.offsetHeight)) {
elmnt.style.top = (parentElement.offsetHeight - elmnt.offsetHeight) + "px";
return;
}
if(elmnt.offsetLeft < 0){elmnt.style.left = "0px";return}
if(elmnt.offsetLeft > (parentElement.offsetWidth - elmnt.offsetWidth)){
elmnt.style.left = (parentElement.offsetWidth - elmnt.offsetWidth) + "px";
return;
}
// set the element's new position:
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
}
function closeDragElement() {
/* stop moving when mouse button is released:*/
document.onmouseup = null;
document.onmousemove = null;
}
}
function showCoords(event) {
var x = event.clientX;
var y = event.clientY;
var coor = "X coords: " + x + ", Y coords: " + y;
document.getElementById("demo").innerHTML = coor;
}
function clearCoor() {
document.getElementById("demo").innerHTML = "";
}
</script>
</body>
</html>
我使用了标签onmove
,但它不起作用。