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longscroll.js
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .longscroll { | |
| overflow-y: auto; | |
| width: 480px; | |
| height: 500px; | |
| float: left; | |
| } | |
| .longscroll .row { | |
| height: 19px; | |
| padding: 0 8px; | |
| border-bottom: solid #eee 1px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v2.min.js?2.10.1"></script> | |
| <script src="longscroll.js"></script> | |
| <script> | |
| var numbers = [ | |
| d3.range(0, 1e6) | |
| ]; | |
| d3.select("body").selectAll("div.longscroll") | |
| .data([numbers, numbers]) | |
| .enter().append("div") | |
| .attr("class", "longscroll") | |
| .call(d3.longscroll() | |
| .size(1e6) | |
| .render(function(g) { | |
| g.text(function(d) { return d; }); | |
| })); | |
| </script> |
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| (function() { | |
| // Virtual rendering for rows taking up to 1e7px of vertical space. | |
| // By Jason Davies, http://www.jasondavies.com/ | |
| d3.longscroll = function() { | |
| var render = null, | |
| size = 0, | |
| position = 0, | |
| rowHeight = 20; | |
| function longscroll(g) { | |
| g.selectAll("div.before").data([0]).enter().append("div").attr("class", "before"); | |
| var current = g.selectAll("div.current").data([0]); | |
| current.enter().append("div").attr("class", "current"); | |
| g.selectAll("div.after").data([0]).enter().append("div").attr("class", "after"); | |
| g.on("scroll.longscroll", function() { | |
| position = Math.floor(this.scrollTop / rowHeight); | |
| scroll(this.scrollTop); | |
| }); | |
| scroll(0); | |
| current.each(function() { | |
| this.scrollIntoView(); | |
| }); | |
| function scroll(scrollTop) { | |
| g.each(function() { | |
| this.scrollTop = scrollTop; | |
| var g = d3.select(this), | |
| rows = 1 + Math.ceil(this.clientHeight / rowHeight), | |
| position0 = Math.max(0, Math.min(size - rows, position)), | |
| position1 = position0 + rows; | |
| g.select(".before").style("height", position0 * rowHeight + "px"); | |
| g.select(".after").style("height", (size - position1) * rowHeight + "px"); | |
| var div = g.select(".current").selectAll("div.row") | |
| .data(function(d, i) { return d[i].slice(position0, Math.min(position1, size)); }) | |
| div.enter().append("div") | |
| .attr("class", "row"); | |
| div.exit().remove(); | |
| div.order().call(render); | |
| }); | |
| } | |
| } | |
| longscroll.render = function(_) { | |
| if (!arguments.length) return render; | |
| render = _; | |
| return longscroll; | |
| }; | |
| longscroll.rowHeight = function(_) { | |
| if (!arguments.length) return rowHeight; | |
| rowHeight = +_; | |
| return longscroll; | |
| }; | |
| longscroll.position = function(_) { | |
| if (!arguments.length) return position; | |
| position = +_; | |
| return longscroll; | |
| }; | |
| longscroll.size = function(_) { | |
| if (!arguments.length) return size; | |
| size = +_; | |
| return longscroll; | |
| }; | |
| return longscroll; | |
| }; | |
| })(); |
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