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Tooltip as a d3 helper
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script type="text/javascript" src="https://d3js.org/d3.v3.min.js"></script> | |
| <script type="text/javascript" src="./tooltip.js"></script> | |
| </head> | |
| <body> | |
| <div class="viz"></div> | |
| <script type="text/javascript"> | |
| var sampleSVG = d3.select('.viz') | |
| .append('svg') | |
| .attr({width: 600, height: 100}); | |
| var data = d3.range(5).map(function(d, i){ return ~~(Math.random()*100); }) | |
| sampleSVG.selectAll('circle') | |
| .data(data) | |
| .enter().append('circle') | |
| .style({stroke: 'gray', fill: 'aliceblue'}) | |
| .attr({r: 40, cx: function(d, i){ return i*100 + 50; }, cy: 50}) | |
| .call(d3.helper.tooltip() | |
| .attr({class: function(d, i) { return d + ' ' + i + ' A'; }}) | |
| .style({color: 'blue'}) | |
| .text(function(d, i){ return 'value: '+d; }) | |
| ) | |
| .on('mouseover', function(d, i){ d3.select(this).style({fill: 'skyblue'}); }) | |
| .on('mouseout', function(d, i){ d3.select(this).style({fill: 'aliceblue'}); }); | |
| </script> | |
| </body> | |
| </html> |
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| d3.helper = {}; | |
| d3.helper.tooltip = function(){ | |
| var tooltipDiv; | |
| var bodyNode = d3.select('body').node(); | |
| var attrs = {}; | |
| var text = ''; | |
| var styles = {}; | |
| function tooltip(selection){ | |
| selection.on('mouseover.tooltip', function(pD, pI){ | |
| var name, value; | |
| // Clean up lost tooltips | |
| d3.select('body').selectAll('div.tooltip').remove(); | |
| // Append tooltip | |
| tooltipDiv = d3.select('body').append('div'); | |
| tooltipDiv.attr(attrs); | |
| tooltipDiv.style(styles); | |
| var absoluteMousePos = d3.mouse(bodyNode); | |
| tooltipDiv.style({ | |
| left: (absoluteMousePos[0] + 10)+'px', | |
| top: (absoluteMousePos[1] - 15)+'px', | |
| position: 'absolute', | |
| 'z-index': 1001 | |
| }); | |
| // Add text using the accessor function, Crop text arbitrarily | |
| tooltipDiv.style('width', function(d, i){ return (text(pD, pI).length > 80) ? '300px' : null; }) | |
| .html(function(d, i){return text(pD, pI);}); | |
| }) | |
| .on('mousemove.tooltip', function(pD, pI){ | |
| // Move tooltip | |
| var absoluteMousePos = d3.mouse(bodyNode); | |
| tooltipDiv.style({ | |
| left: (absoluteMousePos[0] + 10)+'px', | |
| top: (absoluteMousePos[1] - 15)+'px' | |
| }); | |
| // Keep updating the text, it could change according to position | |
| tooltipDiv.html(function(d, i){ return text(pD, pI); }); | |
| }) | |
| .on('mouseout.tooltip', function(pD, pI){ | |
| // Remove tooltip | |
| tooltipDiv.remove(); | |
| }); | |
| } | |
| tooltip.attr = function(_x){ | |
| if (!arguments.length) return attrs; | |
| attrs = _x; | |
| return this; | |
| }; | |
| tooltip.style = function(_x){ | |
| if (!arguments.length) return styles; | |
| styles = _x; | |
| return this; | |
| }; | |
| tooltip.text = function(_x){ | |
| if (!arguments.length) return text; | |
| text = d3.functor(_x); | |
| return this; | |
| }; | |
| return tooltip; | |
| }; |
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