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Tooltip as a d3 helper
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.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) | |
| .attr("height", 100); | |
| var data = []; | |
| for (var i = 0; i < 100; i++) data.push(i); | |
| sampleSVG.selectAll("circle") | |
| .data(data) | |
| .enter().append("circle") | |
| .style("stroke", "gray") | |
| .style("fill", "aliceblue") | |
| .attr("r", 40) | |
| .attr("cx", function(d, i){return i*100 + 50;}) | |
| .attr("cy", 50) | |
| .call(d3.helper.tooltip() | |
| .attr("class", function(d, i) { return d + " " + i + " A"; }) | |
| .attr("d", "b") | |
| .text(function(d, i){return "value: "+d;})); | |
| </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", function(d, i){ | |
| var name, value; | |
| // Clean up lost tooltips | |
| d3.select('body').selectAll('div.tooltip').remove(); | |
| // Append tooltip | |
| tooltipDiv = d3.select('body').append('div'); | |
| for (var i in attrs) { | |
| var name = attrs[i][0]; | |
| if (typeof attrs[i][1] === "function") { | |
| value = attrs[i][1](d, i); | |
| } else value = attrs[i][1]; | |
| if (name === "class") value += " tooltip"; | |
| tooltipDiv.attr(name, value); | |
| } | |
| for (var i in styles) { | |
| name = styles[i][0]; | |
| if (typeof attrs[i][1] === "function") { | |
| value = styles[i][1](d, i); | |
| } else value = styles[i][1]; | |
| tooltipDiv.style(name, value); | |
| } | |
| var absoluteMousePos = d3.mouse(bodyNode); | |
| tooltipDiv.style('left', (absoluteMousePos[0] + 10)+'px') | |
| .style('top', (absoluteMousePos[1] - 15)+'px') | |
| .style('position', 'absolute') | |
| .style('z-index', 1001); | |
| // Add text using the accessor function | |
| var tooltipText = ''; | |
| if (typeof text === "function") tooltipText = text(d, i); | |
| else if (typeof text != "undefined" || typeof text != null) tooltipText = text; | |
| // Crop text arbitrarily | |
| tooltipDiv.style('width', function(d, i){return (tooltipText.length > 80) ? '300px' : null;}) | |
| .html(tooltipText); | |
| }) | |
| .on('mousemove', function(d, i) { | |
| // Move tooltip | |
| var absoluteMousePos = d3.mouse(bodyNode); | |
| tooltipDiv.style('left', (absoluteMousePos[0] + 10)+'px') | |
| .style('top', (absoluteMousePos[1] - 15)+'px'); | |
| var tooltipText = ''; | |
| if (typeof text === "string") tooltipText = text; | |
| if (typeof text === "function") tooltipText = text(d, i); | |
| tooltipDiv.html(tooltipText); | |
| }) | |
| .on("mouseout", function(d, i){ | |
| // Remove tooltip | |
| tooltipDiv.remove(); | |
| }); | |
| } | |
| tooltip.attr = function(name, value) { | |
| attrs.push(arguments); | |
| return this; | |
| } | |
| tooltip.text = function(value) { | |
| text = value; | |
| return this; | |
| } | |
| tooltip.style = function(name, value) { | |
| styles.push(arguments); | |
| return this; | |
| } | |
| return tooltip; | |
| }; |
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