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offsetX / offsetY
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| border: solid 3px steelblue; | |
| cursor: crosshair; | |
| } | |
| #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="http://mbostock.github.com/d3/d3.js?2.7.4"></script> | |
| <script> | |
| d3.select("#child").on("mousemove", function() { | |
| var rect = this.getBoundingClientRect(), | |
| ox = d3.event.pageX - rect.left - this.clientLeft - window.pageXOffset, | |
| oy = d3.event.pageY - rect.top - this.clientTop - window.pageYOffset; | |
| d3.select("#offset").text(ox + "," + oy); | |
| d3.select("#circle") | |
| .style("left", ox + "px") | |
| .style("top", oy + "px"); | |
| }); | |
| </script> |
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