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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