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offsetX / offsetY
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
border: solid 3px steelblue; | |
} | |
#parent { | |
cursor: crosshair; | |
border: solid 7px steelblue; | |
position: relative; | |
margin: 29px auto; | |
padding: 31px; | |
width: 800px; | |
height: 400px; | |
background: #eee; | |
} | |
#child { | |
position: absolute; | |
border: solid 13px steelblue; | |
margin: 17px; | |
padding: 23px; | |
top: 100px; | |
left: 100px; | |
width: 200px; | |
height: 100px; | |
background: #ccc; | |
} | |
#circle { | |
position: absolute; | |
pointer-events: none; | |
border-radius: 12px; | |
margin-left: -12px; | |
margin-top: -12px; | |
width: 24px; | |
height: 24px; | |
background: red; | |
} | |
#small-circle { | |
position: absolute; | |
pointer-events: none; | |
background: black; | |
border-radius: 6px; | |
top: 12px; | |
left: 12px; | |
margin-left: -4px; | |
margin-top: -4px; | |
width: 8px; | |
height: 8px; | |
} | |
</style> | |
<div id="parent"> | |
<div id="offset"></div> | |
<div id="child"> | |
<div id="circle"> | |
<div id="small-circle"></div> | |
</div> | |
</div> | |
</div> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script> | |
d3.select("#child").on("mousemove", function() { | |
var ox, oy; | |
if ("offsetX" in d3.event) { | |
ox = d3.event.offsetX - this.clientLeft; | |
oy = d3.event.offsetY - this.clientTop; | |
} else { | |
ox = d3.event.layerX - this.clientLeft; | |
oy = d3.event.layerY - this.clientTop; | |
} | |
d3.select("#offset").text(ox + "," + oy); | |
d3.select("#circle") | |
.style("left", ox + "px") | |
.style("top", oy + "px"); | |
}); | |
</script> |
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