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javascript - d3 - arrowhead not showing up

问题描述:

I have a bar chart where in I need to point an arrow at a specific bar and giving it a short label. I was able to get the arrow line, but the arrow head is not showing up.

What is that I am doing wrong?

MY code is below:

<!DOCTYPE html>

<meta charset="utf-8">

<style>

body {

font: 10px sans-serif;

}

.axis path,

.axis line {

fill: none;

stroke: #000;

shape-rendering: crispEdges;

}

.bar {

fill: orange;

}

.bar:hover {

fill: orangered ;

}

.x.axis path {

display: none;

}

.d3-tip {

line-height: 1;

font-weight: bold;

padding: 12px;

background: rgba(0, 0, 0, 0.8);

color: #fff;

border-radius: 2px;

}

/* Creates a small triangle extender for the tooltip */

.d3-tip:after {

box-sizing: border-box;

display: inline;

font-size: 10px;

width: 100%;

line-height: 1;

color: rgba(0, 0, 0, 0.8);

content: "\25BC";

position: absolute;

text-align: center;

}

/* Style northward tooltips differently */

.d3-tip.n:after {

margin: -1px 0 0 0;

top: 100%;

left: 0;

}

line {

stroke: black;

}

path.marker {

fill: black;

}

path {

stroke: black;

fill: none;

}

</style>

<body>

<div class="container">

<div class="jumbotron">

<h2 style="text-align:center;">Head And Neck Therapy </h2>

</div>

<nav role="navigation" class="navbar navbar-default">

<!-- Brand and toggle get grouped for better mobile display -->

<div class="navbar-header">

<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">

<span class="sr-only">Toggle navigation</span>

<span class="icon-bar"></span>

<span class="icon-bar"></span>

<span class="icon-bar"></span>

</button>

</div>

<!-- Collection of nav links and other content for toggling -->

<div id="navbarCollapse" class="collapse navbar-collapse">

<ul class="nav navbar-nav">

<li class="active"><a href="#">Data OverView</a></li>

<li><a href="#">Profile</a></li>

<li><a href="#">Messages</a></li>

</ul>

</div>

</nav>

<div id=chartId style="margin-top:50px; margin-left:50px;"></div>

</div>

</body>

<script src="http://d3js.org/d3.v3.min.js"></script>

<script src="http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>

<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap-theme.min.css">

<link href="http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">

<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>

<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>

<script src="http://cameronspear.com/downloads/bootstrap-hover-dropdown/bootstrap-hover-dropdown.js"></script>

<script src="http://code.jquery.com/jquery-1.10.2.js"></script>

<script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>

<style>

.jumbotron {

padding: 0.5em 0.6em;

h1 {

font-size: 2em;

}

p {

font-size: 1.2em;

.btn {

padding: 0.5em;

}

}

}

</style>

<script>

var margin = {top: 10, right: 20, bottom: 30, left: 50},

width = 960 - margin.left - margin.right,

height = 450 - margin.top - margin.bottom;

var formatPercent = d3.format(".0%");

var x = d3.scale.ordinal()

.rangeRoundBands([0, width], .2);

var y = d3.scale.linear()

.range([height, 0]);

var xAxis = d3.svg.axis()

.scale(x)

.orient("bottom");

var yAxis = d3.svg.axis()

.scale(y)

.orient("left")

.tickFormat(function(d) { return d + "%"; });

var tip = d3.tip()

.attr('class', 'd3-tip')

.offset([-10, 0])

.html(function(d) {

return "<strong>" + d.letter + " constitute : </strong> <span style='color:red'> " + d3.format(".2f")(d.frequency) + "% out of total population size</span>";

})

var svg = d3.select("#chartId").append("svg")

.attr("width", width + margin.left + margin.right)

.attr("height", height + margin.top + margin.bottom)

.append("g")

.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

svg.call(tip);

d3.tsv("data.tsv", type, function(error, data) {

var sum = d3.sum(data, function(d){return +d.frequency;});

//this will convert teh frequency into percent

data.forEach(function(d){ d.frequency = (d.frequency/sum)*100});

x.domain(data.map(function(d) { return d.letter; }));

y.domain([0, 100]);

svg.append("g")

.attr("class", "x axis")

.attr("transform", "translate(0," + height + ")")

.call(xAxis);

svg.append("g")

.attr("class", "y axis")

.call(yAxis)

.append("text")

.attr("transform", "rotate(-90)")

.attr("y", 6)

.attr("dy", ".71em")

.style("text-anchor", "end")

.text("Frequency");

svg.selectAll(".bar")

.data(data)

.enter().append("rect")

.attr("class", "bar")

.attr("x", function(d) { return x(d.letter); })

.attr("width", x.rangeBand())

.attr("y", function(d) { return y(d.frequency); })

.attr("height", function(d) { return height - y(d.frequency); })

.on('mouseover', tip.show)

.on('mouseout', tip.hide)

svg.selectAll("text.label")

.data(data.filter(function(d) { return d.frequency == ((441/sum)*100); }))

.enter().append("text")

.attr("class", "label")

.attr("x", function (d) {

return x(d.letter) + x.rangeBand()/2;

}).attr("y", function (d) {

return y(d.frequency) - 70;

})

.style("text-anchor", "middle")

.text("Your Patient");

svg.selectAll("line.arrow")

.data(data.filter(function(d) { return d.frequency == ((441/sum)*100); }))

.enter().append("line")

.attr("class", "arrow")

.attr("x1", function (d) {

return x(d.letter) + x.rangeBand()/2;

})

.attr("x2", function (d) {

return x(d.letter) + x.rangeBand()/2;

})

.attr("y1", function (d) {

return y(d.frequency) - 67;

})

.attr("y2", function (d) {

return y(d.frequency) - 10;

})

.attr("marker-end", "url(#arrow)");

});

function type(d) {

d.frequency = +d.frequency;

d.frequency = d3.format(".2f")(d.frequency)

return d;

}

</script>

</html>

The data.tsv file is as follows:

letter frequency

Asian 4

African-American 96

White 441

Hispanic 81

Other 11

网友答案:

The problem is here:

.attr("marker-end", "url(#arrow)");

There is no marker in the svg defs with Id arrow.

Refer: http://bl.ocks.org/tomgp/d59de83f771ca2b6f1d4 https://developer.mozilla.org/en/docs/Web/SVG/Element/marker

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