Displaying SVG elements with D3 and d3.slider: Uncaught ReferenceError: svg is not defined
Question
Hey Im' currently experimenting with this D3 Example and I want to implement my own slider which is showing data of a json File (I included everything in a github repo because I don't know how to show you my working files and not spend to much space for it - especially the json file. Any tips for the future?). So basically I have my bubble.html:
<!DOCTYPE html>
<head>
<title>D3 Mapping Timeline</title>
<meta charset="utf-8">
<link rel="stylesheet" href="d3.slider.css" />
<style>
path {
fill: none;
stroke: #333;
stroke-width: .5px;
}
.land-boundary {
stroke-width: 1px;
}
.county-boundary {
stroke: #ddd;
}
.site {
stroke-width: .5px;
stroke: #333;
fill: #9cf;
}
#slider3 {
margin: 20px 0 10px 20px;
width: 900px;
}
</style>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script src="d3.slider.js"></script>
</head>
<body>
<div id="slider3"></div>
<script>
var width = 1240,
height = 720;
var projection = d3.geo.mercator()
.translate([width / 2, height / 2])
.scale((width - 1) / 2 / Math.PI);
d3.json("vorfaelle.json", function(error, data){
console.log(data.features[1].geometry.coordinates);
window.site_data = data;
});
var displaySites = function(data) {
var sites = svg.selectAll(".site")
.data(data);
sites.enter().append("circle")
.attr("class", "site")
.attr("cx", function(d) {
for (var i = 0; i < d.features.length+1; i++) {
console.log(d.features[i].geometry.coordinates[0]);
return projection(d.features[i].geometry.coordinates[0])
//return projection([d.lng, d.lat])[0];
}
})
.attr("cy", function(d) {
for (var i = 0; i < d.features.length+1; i++) {
console.log(d.features[i].geometry.coordinates[1]);
return projection([d.features[i].geometry.coordinates[1]])
//return projection([d.lng, d.lat])[0];
}
})
.attr("r", 1)
.transition().duration(400)
.attr("r", 5);
sites.exit()
.transition().duration(200)
.attr("r",1)
.remove();
};
// var minDateUnix = moment('2014-07-01', "YYYY MM DD").unix();
// var maxDateUnix = moment('2015-07-21', "YYYY MM DD").unix();
var dateParser = d3.time.format("%d.%m.%Y").parse;
var minDate = dateParser("01.01.2015");
var maxDate = dateParser("31.12.2015");
console.log(minDate);
var secondsInDay = 60 * 60 * 24;
d3.select('#slider3').call(d3.slider()
.axis(true).min(minDate).max(maxDate).step(1)
.on("slide", function(evt, value) {
var newData = _(site_data).filter( function(site) {
console.log(site)
// for (var i = 0; i < site.features.length; i++) {
// return site.features[i].properties.date < value;
// }
})
console.log("New set size ", newData.length);
displaySites(newData);
})
);
</script>
</body>
which is getting the data from the json (on my repo vorfaelle.json). Now when I move the slider handle it "crashes" and gives me this error: What's exactly wrong? Is it because i did not read the data properly?
1 answers
solution1
1 2015-12-27 01:02:27
Add the svg element to the dom and assign it to a variable so that you can use it your code.
var svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
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