I am attempting to build a very basic bar chart. Three bars. The data is correct. However, the bars do not display, nor are they showing up when I inspect the barchart with dev tools. However, the x-axis and y-axis render correctly, with the correct labels and tick marks.
function buildBarChart(data) {
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.scale.ordinal()
.rangeRoundBands([0, width], .1);
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");
var chart = d3.select(".barchart").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 mapped_values = _.map(data, function(d) {
return d.count;
});
x.domain(d3.keys(data));
y.domain([0, d3.max(mapped_values)]);
chart.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
chart.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("Count");
_.each(data, function(d) {
console.log(d.name + " ++ " + (height - y(d.count)) + " ++ " + d.count);
});
chart.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return x(d.name) })
.attr("width", x.rangeBand())
.attr("y", function(d) { return y(d.count); })
.attr("height", function(d) { return height - y(d.count); });
};
The result of the console.log above is:
quotes ++ 90 ++ 16
subscriptions ++ 450 ++ 80
sponsored_licenses ++ 45 ++ 8
which is correct. I have been starting at this for hours and cannot figure out why everything displays (including the line charts on the same page) except for the bars.
Why are my bars not displaying?
The data you assign to a selection has to be an array, not a key:value object. You can use the d3.values(object) utility function to extract just the values as an array.
chart.selectAll(".bar")
.data(d3.values(data))
/* etc. */
However, the key values for the objects are no longer available in that form, and I notice that you're using them for the x-axis. If the keys are the same as the "name" of the data object that shouldn't be a problem. If not, the d3.entries() utility function returns both keys and values, but the values become a nested object, so you'd have to use d.value.name and d.value.count to access the original data.
Related
I have a big problem.
I use d3 to visualize my (poll)data. (So Questions and answers) It works fine except one problem.
Sometimes it doesn't visualize the data like they are. For example one time d3 get all right data about d3.json. But the graph is not right. It should load 300 answers in the first bars but it just show 50. I tested it and the json works.
I tried to filter the graph and I got the same problem.
This is my d3 code.
<div>
<script src="http://d3js.org/d3.v3.js"></script>
<script>
var margin = {
top: 20,
right: 30,
bottom: 30,
left: 430
},
width = 1400 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var xScale = d3.scale.ordinal()
.rangeRoundBands([0, width], .1);
var yScale = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left")
.ticks(10);
var svg = d3.select("body")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.attr("class", "chart");
var chart = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.json("getdata.php", function(error, data) {
xScale.domain(data.map(function(d) {
return d.text;
}));
yScale.domain([0, d3.max(data, function(d) {
return d.count;
})]);
chart.selectAll(".bar")
.data(data)
.enter()
.append("rect")
.attr("class", "bar")
.attr("x", function(d) {
return xScale(d.text);
})
.attr("y", function(d) {
return yScale(d.count);
})
.attr("height", function(d) {
return height - yScale(d.count);
})
.attr("width", xScale.rangeBand())
chart.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
chart.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("Antworten");
});
function type(d) {
d.count = +d.text;
return d;
}
</script>
</div>
I guess the problem starts here. But I don't know why. The problem doesn't appear at every question. Only at a few or when I try to use my filter.
Maybe it happens when two values have a big difference?
Update:
It is like: D3 doesn't want to lose the smallest bar. So other bars must based on that smallest. And then the values are not correct for the bigger bars. Maybe the Y scale depends on the smallest bar.
I looking any chart library which has configuration for custom y-axis values. I want to customize the y-axis like ( 0 to 3). I seen D3 and other chart libraries, the Y-axis automatically generates the values. I my design there is only one filed and on one for compare on the x-axis.
Which chart library is most suited for this condition to make this happen. If any example already on google, please share...
If you are looking for a D3 solution then you can refer my fiddle below:
http://jsfiddle.net/cyril123/7ftuumv4/2/
code:
var margin = {
top: 20,
right: 20,
bottom: 30,
left: 40
},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
//specify data here
data = [{letter: "1", value: 1.3}]
var x = d3.scale.ordinal()
.rangeRoundBands([0, width], .1);
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")
;
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 + ")");
//as you have a fixed x axis value and single data
x.domain([data[0].letter]);
//as you have a fixed range for y axis
y.domain([0, 3]);
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("Value");
//make the bar chart
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.value); })
.attr("height", function(d) { return height - y(d.value); });
I am trying to plot a bar chart by taking two columns from my database and converting it to JSON using json_encode in PHP (probc.php file)
I referred to this example here to construct a bar chart - BAR CHART EXAMPLE
After doing so, I changed the attributes letters and frequency to the column names I wanted to use (fphour for x-axis and fpprob for y-axis), and also changed d3.tsv to d3.json and included the relevant file (probc.php). But I do not get any results on running my file. Just a blank vanilla page. Please help!
Here's the code
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
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.scale.ordinal()
.rangeRoundBands([0, width], .1);
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")
.ticks(10, "%");
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 + ")");
d3.json("probc.php", type, function(error, data) {
x.domain(data.map(function(d) { return d.fphour; }));
y.domain([0, d3.max(data, function(d) { return d.fpprob; })]);
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.fphour); })
.attr("width", x.rangeBand())
.attr("y", function(d) { return y(d.fpprob); })
.attr("height", function(d) { return height - y(d.fpprob); });
});
function type(d) {
d.fpprob = +d.fpprob;
return d;
}
</script>
Type should not be here .
d3.json("probc.php", ***type***, function(error, data) {
Remove type
d3.json("probc.php", function(error, data) {
I have some number of amount (in dollar) which I am showing on y-axis and year on x-axis. now, I want to show original number on y-axis but not able to do.
i mean on y axis i want to show number from 1 to 100000 as amount but now, with .ticks(10) i can only used between 0 to 8000 amount at y axis.
and one more thing that if i want to show name as string at x axis then how can i show please let me know. i am stuck here and newly with d3.
function test() {
var graph_data;
// in graph_data it should contain value like this
// [Object { letter="2011", frequency="10000"},
// Object { letter="2012", frequency="8200"}]
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.scale.ordinal()
.rangeRoundBands([0, 110], .3);
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.tickPadding(10)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.tickPadding(3)
.orient("left")
.ticks(10);
var svg = d3.select("#award_by_year_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 + ")");
x.domain(graph_data.map(function(d) { return d.letter; }));
y.domain([0, d3.max(graph_data, function(d) { return d.frequency; })]);
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("Total dollar");
svg.selectAll(".bar")
.data(graph_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); });
function type(d) {
d.frequency = +d.frequency;
return d;
}
}
now, this code is working as below chart image. and i want to change value of y axis according to total dollar value and it's coming from table and it can also -ve as well +ve and upper limit not fixed. then how can resolve.
please give me valuable solution.
thanks
Ok, from what I understand from your question here's what I got:
i mean on y axis i want to show number from 1 to 100000 as amount but
now, with .ticks(10) i can only used between 0 to 8000 amount at y
axis.
For this I would check out https://github.com/mbostock/d3/wiki/SVG-Axes#wiki-tickValues, which documents the function tickValues. With this you can specify exactly what you want to show on the y axis. Say you want to show just 0 and 100000 then you can simply pass the array [0, 10000].
and one more thing that if i want to show name as string at x axis
then how can i show please let me know. i am stuck here and newly with
d3.
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
.selectAll('text')
.text(function(d) {
return 'Some string: ' + d.letter
})
This will let you customize any of the tick values on the x axis. In case I didn't understand the first part of the question, you can also use this trick on the y axis to customize the output of the tick value.
I have a variable called final csv which looks like and is stored in a CSV format. The lines are separated by a \n. I'm using the statement D3.csv.parse. Can anyone tell me why nothing appears on the page at all? :-
String, Float
value, 1
value2, 2
function generateGraph(finalcsv)
{
var finaldata = finalcsv;
var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var formatPercent = d3.format(".0");
var x = d3.scale.ordinal()
.rangeRoundBands([0, width], .1, 1);
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(formatPercent);
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 + ")");
console.log(finaldata);
d3.csv.parse(finaldata, function(error, data) {
data.forEach(function(d) {
d.Float = +d.Float;
});
x.domain(data.map(function(d) { return d.String; }));
y.domain([0, d3.max(data, function(d) { return d.Float; })]);
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("Integer");
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return x(d.String); })
.attr("width", x.rangeBand())
.attr("y", function(d) { return y(d.Float); })
.attr("height", function(d) { return height - y(d.Float); });
});
}
I quickly built an example which seems to work (or at least it shows something): http://jsfiddle.net/frXRW/2/
The first difference with the code you provided is that I didn't use the d3.csv.parse() function , I don't know if your problem comes from there but I suggest you take a look at the documentation if your problem comes from there: https://github.com/mbostock/d3/wiki/CSV
The second thing I changed, and that I suspect is the source of your problem, is that you forgot to put the #body identifier between "", so it is considered as an object. Thus I just changed the following line:
var svg = d3.select(#body).append("svg")
to
var svg = d3.select("#body").append("svg")
If this was your problem, then I would recommend you to use the chrome javascript console as it gave the following error pointing exactly to the line above:
Uncaught SyntaxError: Unexpected identifier