Rects won't show up on d3 histogram - javascript

I'm using Polymer to render some d3 charts. When the Polymer is initially rendered I only draw a graph with axes and no data, since the data comes later once the API calls succeed. However, when I get around to adding the 'rect' elements in the svg, despite them showing up in the Chrome devtools element inspector, they don't show up in the chart itself.
dataChanged: function() {
var data = this.data;
var margin = {top: 20, right: 20, bottom: 30, left: 50},
width = this.width - margin.left - margin.right,
height = this.height - margin.top - margin.bottom;
// format the data
data.forEach(function(d) {
d.date = d3.isoParse(d.date);
});
// set the ranges
var x = d3.scaleTime()
.domain(d3.extent(data, function(d) { return d.date; }))
.rangeRound([0, width]);
var y = d3.scaleLinear()
.range([height, 0]);
var svg = d3.select(this.$.chart);
var histogram = d3.histogram()
.value(function(d) { return d.date; })
.domain(x.domain())
.thresholds(x.ticks(d3.timeMonth));
var bins = histogram(data);
y.domain([0, d3.max(bins, function(d) { return d.length; })]);
var t = d3.transition()
.duration(750)
.ease(d3.easeLinear);
svg.selectAll("rect")
.data(bins)
.enter().append("rect")
.attr("class", "bar")
.attr("x", 1)
.attr("transform", function(d) {
return "translate(" + x(d.x0) + "," + y(d.length) + ")";
})
.attr("width", function(d) { return x(d.x1) - x(d.x0) -1 ; })
.attr("height", function(d) { return height - y(d.length); });
svg.select(".xAxis")
.transition(t)
.call(d3.axisBottom(x));
svg.select(".yAxis")
.transition(t)
.call(d3.axisLeft(y));
},
ready: function() {
var margin = {top: 20, right: 20, bottom: 30, left: 50},
width = this.width - margin.left - margin.right,
height = this.height - margin.top - margin.bottom;
// set the ranges
var x = d3.scaleTime()
.domain([new Date(2010, 6, 3), new Date(2012, 0, 1)])
.rangeRound([0, width]);
var y = d3.scaleLinear()
.range([height, 0]);
// Add the SVG to my 'chart' div.
var svg = d3.select(this.$.chart).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 + ")");
// Add the X Axis
svg.append("g")
.attr("class","xAxis")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// Add the Y Axis
svg.append("g")
.attr("class","yAxis")
.call(d3.axisLeft(y));
}
ready() gets called upon rendering, dataChanged() when the parent component passes a chunk of data down.
The axes get rendered correctly, with the right transitions and the right dimensions, but the rects don't. They show up in the chrome element inspector with a 0x17 size, even though this is what they look like: <rect class="bar" x="1" transform="translate(0,24.06417112299465)" width="101" height="275.93582887700535"></rect>

In your ready function, you are grabbing your div creating an svg element adding a g element and then appending your axis to that g.
In your dataChanged function, you are grabbing your div and appending rects to it.
See the disconnect? You can't parent svg to HTML.
In ready do this:
var svg = d3.select(this.$.chart).append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("id", "canvas")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
In dataChanged:
var svg = d3.select("#canvas");
This will allow you to "find" the appropriate g to append your rects to.

Related

D3 Area Chart with a Single Value Not Rendering

When building an area chart in D3.js, when you have only a single value the chart does not render.
For demonstration purposes, I modified the following example: https://d3-graph-gallery.com/graph/area_basic.html to illustrate the problem.
<script>
// set the dimensions and margins of the graph
var margin = {top: 10, right: 30, bottom: 30, left: 50},
width = 460 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
// append the svg object to the body of the page
var svg = d3.select("#my_dataviz")
.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 + ")");
//Read the data
d3.csv("https://raw.githubusercontent.com/holtzy/data_to_viz/master/Example_dataset/3_TwoNumOrdered_comma.csv",
// When reading the csv, I must format variables:
function(d){
return { date : d3.timeParse("%Y-%m-%d")(d.date), value : d.value }
},
// Now I can use this dataset:
function(data) {
data = [data[0]]
// Add X axis --> it is a date format
var x = d3.scaleTime()
.domain(d3.extent(data, function(d) { return d.date; }))
.range([ 0, width ]);
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// Add Y axis
var y = d3.scaleLinear()
.domain([0, d3.max(data, function(d) { return +d.value; })])
.range([ height, 0 ]);
svg.append("g")
.call(d3.axisLeft(y));
// Add the area
svg.append("path")
.datum(data)
.attr("fill", "#cce5df")
.attr("stroke", "#69b3a2")
.attr("stroke-width", 1.5)
.attr("d", d3.area()
.x(function(d) { return x(d.date) })
.y0(y(0))
.y1(function(d) { return y(d.value) })
)
})
</script>
I would expect that chart to look something like:
If you inspect the element the path element you can see it is rendering, just 0 width/height:

D3 - display x value data ticks as percentages

Have a line graph shown as here: https://imgur.com/1kadiJF
Would love the x-axis to display a & sign after each tick, 10%, 20%, etc. How does one accomplish this?
I've read up on a format method one can use, as well as saw people using Math and actually doing a conversion, but figure there must be a quick way to add a string % after each tick, surely!
Using V4 of D3 here
<script>
// set the dimensions and margins of the graph
const formatPercent = d3.format(".0%")
const margin = {top: 20, right: 30, bottom: 60, left: 250},
width = 1000 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom;
// append the svg object to the body of the page
const svg = d3.select(".line")
.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 + ")");
// Parse the Data
d3.json("./data/linedata.json", function(data) {
// Add X axis
const x = d3.scaleLinear()
.domain([0, 100])
.range([ 0, width]);
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x))
.selectAll("text").attr('class', 'xaxis')
.attr("transform", "translate(0,0 )")
.style("text-anchor", "end");
// Y axis
const y = d3.scaleBand()
.range([ 0, height ])
.domain(data.map(function(d) { return d.desc; }))
.padding(.1)
svg.append("g").attr('class', 'xaxis')
.call(d3.axisLeft(y))
//Bars
svg.selectAll("myRect")
.data(data)
.enter()
.append("rect")
.attr("x", x(0) )
.attr("y", function(d) { return y(d.desc); })
.attr("width", function(d) { return x(d.total); })
.attr("height", y.bandwidth() )
.attr("fill", "#008080")
})
</script>
Have you tried using the tickFormat function?
Something like this should work:
.tickFormat(d => d + "%")

Bar Chart Labels stuck in top left corner

I am trying to make simple chart right now importing data from a CSV. Everything on the chart is working great except for the labels. In element inspect I can see that they are being appended and that their x and y coordinates are even correct, but for some reason they are all trapped in the top left corner in the SVG itself.
I have tried changing the x placement function at first because I thought it just wasn't giving the labels a x position, but upon further inspection the labels have the correct metadata.
//Graph Dimensions
var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 1000 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
//Set Ranges
var x_scale = d3.scaleBand()
.range([0, width])
.padding(0.1);
var y_scale = d3.scaleLinear()
.range([height, 0]);
//Create SVG object
var svg = d3.select('#chart')
.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 + ")");
//Retrieve data
d3.csv('sales.csv').then(function(data){
//Set domains based on data
x_scale.domain(data.map(function(d) { return d.month; }));
y_scale.domain([0, d3.max(data, function(d) { return d.sales; })]);
//Create bars
svg.selectAll("rect")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return x_scale(d.month); })
.attr("width", x_scale.bandwidth())
.attr("y", function(d) { return y_scale(d.sales); })
.attr("height", function(d) { return height - y_scale(d.sales); });
//Create labels
svg.selectAll('text')
.data(data)
.enter().append('text')
.attr('class', 'label')
.attr("x", function(d) { return x_scale(d.month); })
.attr("y", function(d) { return y_scale(d.sales); })
.attr( 'font-size', 14 )
.attr( 'fill', '#555555' )
.attr( 'text-anchor', 'middle' );
//Add Axes
svg.append("g") //X Axis
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x_scale));
svg.append("g") //Y Axis
.call(d3.axisLeft(y_scale));
})
The only thing im looking for is the labels actually appearing. I can change their location later if needed.

D3.js v4 horizontal panning only (no zoom)

I'm new to D3.js and am trying to build a very-wide line chart that pans horizontally to show more data from a .csv file. I haven't been able to find many good resources for the latest version of D3.
What I'm trying to achieve:
chart fills the screen with overflow hidden
drag/mousewheel reveals more data from the right
axis labels stay put (but x-axis changes to reflect new data)
no zooming
The code I have right now renders the chart, and it can be clicked and dragged, but the whole thing just moves off the screen... Here's the code:
var margin = {top: 50, right: 50, bottom: 50, left: 50},
width = window.innerWidth - margin.left - margin.right,
height = window.innerHeight - margin.top - margin.bottom;
var x = d3.scaleLinear().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
var line = d3.line()
.x(function(d) { return x(d.mile); })
.y(function(d) { return y(d.elevation); })
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.call(d3.zoom().on("zoom", function () {
svg.attr("transform", d3.event.transform)
}))
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
function draw(data) {
data.forEach(function(d) {
d.mile = +d.mile;
d.elevation = +d.elevation;
});
x.domain(d3.extent(data, function(d) { return d.mile }) )
y.domain([0, d3.max(data, function(d) {
return Math.max(d.elevation) }) ]);
svg.append("path")
.data([data])
.attr("class", "line")
.attr("d", line)
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
svg.append("g")
.call(d3.axisLeft(y));
}
d3.json("data.json", function(error, data) {
if (error) throw error;
draw(data)
});
And here's a sample of what the data looks like:
mile,elevation
1505.9,1800
1506.4,1360
1507.0,1340
1507.9,1750
1509.7,2365
Thanks in advance for any resources anyone can offer me to help solve this!

cant figure out d3.js error

var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var x = d3.scaleBand()
.range([0, width])
.padding(0.1);
var y = d3.scaleLinear()
.range([height, 0]);
var svg = d3.select("body").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 + ")");
var temp = [ {"Gender":"Male","count":5}, {"Gender":"Female","count":2}];
var data=[]
data.push(temp);
x.domain(data.map(function(d) { return d.Gender; }));
y.domain([0, d3.max(data, function(d) { return d.count; })]);
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(data) { return x(data.Gender); })
.attr("width", x.bandwidth())
.attr("y", function(d) { return y(data.count); })
.attr("height", function(d) { return height - y(data.count); });
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
svg.append("g")
.call(d3.axisLeft(y));
<style> /* set the CSS */
.bar { fill: steelblue; }
</style>
<!DOCTYPE html>
<body><script src="//d3js.org/d3.v4.min.js"></script></body>
I want a graph to plot male and female count. count in y-axis and gender in x-axis
my d3.js index.html
where data_json is the this data
[ {"Gender":"Male","count":5}, {"Gender":"Female","count":2}];
im getting graph for only 1 set i.e {"Gender":"Male","count":5} if i set data_json to the same else only axis is displayed.
but not together in same graph. Im new to d3.js and unable to figure out the solution. please help.
Your error is stems from this:
var temp = [ {"Gender":"Male","count":5}, {"Gender":"Female","count":2}];
var data=[]
data.push(temp);
The d3 .data method takes an array. Combined with an enter selection, one element can be appended per item in the array. temp is already an array, by pushing it to data you are making an array like the follows:
[[ {"Gender":"Male","count":5}, {"Gender":"Female","count":2}]]
This array has only one item, a sub-array. The sub-array is really what you want though. This is also creates problems when using the scales:
x.domain(data.map(function(d) { return d.Gender; }));
As each datum (and there is only one) comprises of an array, d.Gender will be undefined, d[1] will be defined.
Instead, use your temp array as your dataset without pushing it into a new array. Then modify the y, x, and height values of each rect to access d.count or d.Gender rather than data.Gender or data.count (as data.count is undefined, and also not datum specific, while d.count is the count associated with the datum bound to each rect).
Take a look at the snippet below which makes these changes:
var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 500 - margin.left - margin.right,
height = 200 - margin.top - margin.bottom;
var x = d3.scaleBand()
.range([0, width])
.padding(0.1);
var y = d3.scaleLinear()
.range([height, 0]);
var svg = d3.select("body").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 + ")");
var data = [ {"Gender":"Male","count":5}, {"Gender":"Female","count":2}];
x.domain(data.map(function(d) { return d.Gender; }));
y.domain([0, d3.max(data, function(d) { return d.count; })]);
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(data) { return x(data.Gender); })
.attr("width", x.bandwidth())
.attr("y", function(d) { return y(d.count); })
.attr("height", function(d) { return height - y(d.count); });
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
svg.append("g")
.call(d3.axisLeft(y));
<style> /* set the CSS */
.bar { fill: steelblue; }
</style>
<!DOCTYPE html>
<body><script src="//d3js.org/d3.v4.min.js"></script></body>

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