D3 (with angular) Failing to insert a span inside a div - d3.js

I have this working code. where the d3 part is basically:
var bar = chart.append("div").attr("class", "chart")
.selectAll('div')
.data(scope.data.sort().reverse()).enter().append("div")
.transition().ease("elastic")
.style("width", function(d) { return (d[0]/sum)*attrs.chartWidth + "px"; })//This is where I base the width as a precentage from the sum and calculate it according to the chart-width attribute
.style("background-color",function(){i++;if (i<=colors.length-1){return colors[i-1]} else {return colors[(i-1)%colors.length]}}).text(function(d) { return d[1] ; })
but when I try to append("span") in the chaining so the text would be on the span and not in the parent div. the text just disappears and the dev console shows no clue of both the span and the text. Also tried insert("span") and even replacing the .text for .html(function(d){return "<span>"+d[1]+"</span>"}
neither work.
any clues? Thanks!

The problem is that you are starting a transition in the chain. The transition object provides many functions just like a normal d3.selection including .remove, .text and .html, but does not allow .append operation.
You should re-factor the code to read:
var bar = chart.append("div").attr("class", "chart")
.selectAll('div')
.data(scope.data.sort().reverse()).enter().append("div");
bar
.transition().ease("elastic")
.style("width", function(d) { return (d[0]/sum)*attrs.chartWidth + "px"; })//This is where I base the width as a precentage from the sum and calculate it according to the chart-width attribute
.style("background-color",function(){i++;if (i<=colors.length-1){return colors[i-1]} else {return colors[(i-1)%colors.length]}}) })
bar.append('span')
.text(function(d) { return d[1] });
Demo
As a side note, while selecting the background-color, you do not need to maintain the index variable yourself, d3 passes the data d and the index i to the setter function you provide to .style:
.style("background-color",
function(d, i){ // <-- 'd' and 'i' are passed by d3
if (i<=colors.length-1)
{return colors[i-1]}
else {return colors[(i-1)%colors.length]}})
})

Related

How to add label or custom value on Mapchart's path using geoChoroplethChart and dc.js?

var IndChart = dc.geoChoroplethChart("#india-chart");
var states = data.dimension(function (d) {
return d["state_name"];
});
var stateRaisedSum = states.group().reduceSum(function (d) {
return d["popolation"];
});
IndChart
.width(700)
.height(500)
.dimension(states)
.group(stateRaisedSum)
.colors(d3.scale.ordinal().domain().range(["#27AE60", "#F1C40F", "#F39C12","#CB4335"]))
.overlayGeoJson(statesJson.features, "state", function (d) { //console.log(d.properties.name);
return d.id;
})
.projection(d3.geo.mercator().center([95, 22]).scale(940))
.renderLabel(true)
.title(function (d) { console.log(d); return d.key + " : " + d.value ;
})
.label(function (d) { console.log(d);}) ;
wanted to add Label or custom value(25%, added in Map chart screen-shots) in map chart for each path using dc.js.
In the comments above, you found or created a working example that answers your original question. Then you asked how to make it work for two charts on the same page.
This is just a matter of getting the selectors right, and also understanding how dc.js renders and redraws work.
First off, that example does
var labelG = d3.select("svg")
which will always select the first svg element on the page. You could fix this by making the selector more specific, i.e. #us-chart svg and #us-chart2 svg, but I prefer to use the chart.select() function, which selects within the DOM tree of the specific chart.
Next, it's important to remember that when you render a chart, it will remove everything and start from scratch. This example calls dc.renderAll() twice, so any modifications made to the first chart will be lost on the second render.
In contrast, a redraw happens when any filter is changed, and it incrementally changes the chart, keeping the previous content.
I prefer to listen to dc.js chart events and make my modifications then. That way, every time the chart is rendered or redrawn, modifications can be made.
In particular, I try to use the pretransition event whenever possible for modifying charts. This happens right after drawing, so you have a chance to change things without any glitches or pauses.
Always add event listeners before rendering the chart.
Adding (the same) handler for both charts and then rendering, looks like this:
usChart.on('pretransition', function(chart) {
var project = d3.geo.albersUsa();
var labelG = chart.select("svg")
.selectAll('g.Title')
.data([0])
.enter()
.append("svg:g")
.attr("id", "labelG")
.attr("class", "Title");
labelG.selectAll("text")
.data(labels.features)
.enter().append("svg:text")
.text(function(d){return d.properties.name;})
.attr("x", function(d){return project(d.geometry.coordinates)[0];})
.attr("y", function(d){return project(d.geometry.coordinates)[1];})
.attr("dx", "-1em");
});
usChart2.on('pretransition', function(chart) {
var project = d3.geo.albersUsa();
var labelG = chart.select("svg")
.selectAll('g.Title')
.data([0])
.enter()
.append("svg:g")
.attr("id", "labelG")
.attr("class", "Title");
labelG.selectAll("text")
.data(labels.features)
.enter().append("svg:text")
.text(function(d){return d.properties.name;})
.attr("x", function(d){return project(d.geometry.coordinates)[0];})
.attr("y", function(d){return project(d.geometry.coordinates)[1];})
.attr("dx", "-1em");
});
dc.renderAll();
I used one more trick there: since pretransition happens for both renders and redraws, but we only want to add these labels once, I use this pattern:
.selectAll('g.Title')
.data([0])
.enter()
.append("svg:g")
.attr("class", "Title");
This is the simplest data binding there is: it says we want one g.Title and its data is just the value 0. Since we give the g element the Title class, this ensures that we'll add this element just once.
Finally, the result of this expression is an enter selection, so we will only add text elements when the Title layer is new.
Fork of your fiddle.

piechart over a map point using d3.js

I want to draw a pie chart for every point on the map instead of a circle.
The map and the points are displaying well but the pie chart is not showing over the map points. There is no error also. I can see the added pie chart code inside map also.
Below is the code snippet .
var w = 600;
var h = 600;
var bounds = [[78,30], [87, 8]]; // rough extents of India
var proj = d3.geo.mercator()
.scale(800)
.translate([w/2,h/2])
.rotate([(bounds[0][0] + bounds[1][0]) / -2,
(bounds[0][1] + bounds[1][1]) / -2]); // rotate the project to bring India into view.
var path = d3.geo.path().projection(proj);
var map = d3.select("#chart").append("svg:svg")
.attr("width", w)
.attr("height", h);
var india = map.append("svg:g")
.attr("id", "india");
var gDataPoints = map.append("g"); // appended second
d3.json("data/states.json", function(json) {
india.selectAll("path")
.data(json.features)
.enter().append("path")
.attr("d", path);
});
d3.csv("data/water.csv", function(csv) {
console.log(JSON.stringify(csv))
gDataPoints.selectAll("circle")
.data(csv)
.enter()
.append("circle")
.attr("id", function (d,i) {
return "chart"+i;
})
.attr("cx", function (d) {
return proj([d.lon, d.lat])[0];
})
.attr("cy", function (d) {
return proj([d.lon, d.lat])[1];
})
.attr("r", function (d) {
return 3;
})
.each(function (d,i) {
barchart("chart"+i);
})
.style("fill", "red")
//.style("opacity", 1);
});
function barchart(id){
var data=[15,30,35,20];
var radius=30;
var color=d3.scale.category10()
var svg1=d3.select("#"+id)
.append("svg").attr('width',100).attr('height',100);
var group=svg1.append('g').attr("transform","translate(" + radius + "," + radius + ")");
var arc=d3.svg.arc()
.innerRadius('0')
.outerRadius(radius);
var pie=d3.layout.pie()
.value(function(d){
return d;
});
var arcs=group.selectAll(".arc")
.data(pie(data))
.enter()
.append('g')
.attr('class','arc')
arcs.append('path')
.attr('d',arc)
.attr("fill",function(d,i){
return color(d.data);
//return colors[i]
});
}
water.csv:
lon,lat,quality,complaints
80.06,20.07,4,17
72.822,18.968,2,62
77.216,28.613,5,49
92.79,87.208,4,3
87.208,21.813,1,12
77.589,12.987,2,54
16.320,75.724,4,7
In testing your code I was unable to see the pie charts rendering, at all. But, I believe I still have a solution for you.
You do not need a separate pie chart function to call on each point. I'm sure that there are a diversity of opinions on this, but d3 questions on Stack Overflow often invoke extra functions that lengthen code while under-utilizing d3's strengths and built in functionality.
Why do I feel this way in this case? It is hard to preserve the link between data bound to svg objects and your pie chart function, which is why you have to pass the id of the point to your function. This will be compounded if you want to have pie chart data in your csv itself.
With d3's databinding and selections, you can do everything you need with much simpler code. It took me some time to get the hang of how to do this, but it does make life easier once you get the hang of it.
Note: I apologize, I ported the code you've posted to d3v4, but I've included a link to the d3v3 code below, as well as d3v4, though in the snippets the only apparent change may be from color(i) to color[i]
In this case, rather than calling a function to append pie charts to each circle element with selection.each(), we can append a g element instead and then append elements directly to each g with selections.
Also, to make life easier, if we initially append each g element with a transform, we can use relative measurements to place items in each g, rather than finding out the absolute svg coordinates we would need otherwise.
d3.csv("water.csv", function(error, water) {
// Append one g element for each row in the csv and bind data to it:
var points = gDataPoints.selectAll("g")
.data(water)
.enter()
.append("g")
.attr("transform",function(d) { return "translate("+projection([d.lon,d.lat])+")" })
.attr("id", function (d,i) { return "chart"+i; })
.append("g").attr("class","pies");
// Add a circle to it if needed
points.append("circle")
.attr("r", 3)
.style("fill", "red");
// Select each g element we created, and fill it with pie chart:
var pies = points.selectAll(".pies")
.data(pie([0,15,30,35,20]))
.enter()
.append('g')
.attr('class','arc');
pies.append("path")
.attr('d',arc)
.attr("fill",function(d,i){
return color[i];
});
});
Now, what if we wanted to show data from the csv for each pie chart, and perhaps add a label. This is now done quite easily. In the csv, if there was a column labelled data, with values separated by a dash, and a column named label, we could easily adjust our code to show this new data:
d3.csv("water.csv", function(error, water) {
var points = gDataPoints.selectAll("g")
.data(water)
.enter()
.append("g")
.attr("transform",function(d) { return "translate("+projection([d.lon,d.lat])+")" })
.attr("class","pies")
points.append("text")
.attr("y", -radius - 5)
.text(function(d) { return d.label })
.style('text-anchor','middle');
var pies = points.selectAll(".pies")
.data(function(d) { return pie(d.data.split(['-'])); })
.enter()
.append('g')
.attr('class','arc');
pies.append("path")
.attr('d',arc)
.attr("fill",function(d,i){
return color[i];
});
});
The data we want to display is already bound to the initial g that we created for each row in the csv. Now all we have to do is append the elements we want to display and choose what properties of the bound data we want to show.
The result in this case looks like:
I've posted examples in v3 and v4 to show a potential implementation that follows the above approach for the pie charts:
With one static data array for all pie charts as in the example: v4 and v3
And by pulling data from the csv to display: v4 and v3

Conditionally render a text element if a certain property is present in the data

I am using d3 for a bar chart in my application and have a need to annotate each of the bars with a piece of text for the data value the bar represents.
I have this working so far like so:
layers = svg.selectAll('g.layer')
.data(stacked, function(d) {
return d.dataPointLegend;
})
.enter()
.append('g')
.attr('class', function(d) {
return d.dataPointLegend;
});
layers.selectAll('rect')
.data(function(d) {
return d.dataPointValues;
})
.enter()
.append('rect')
.attr('x', function(d) {
return x(d.pointKey);
})
.attr('width', x.rangeBand())
.attr('y', function(d) {
return y(d.y0 + d.pointValue);
})
.attr('height', function(d) {
return height - margin.bottom - margin.top - y(d.pointValue)
});
layers.selectAll('text')
.data(function(d) {
return d.dataPointValues;
})
.enter()
.append('text')
.text(function() {
return 'bla';
})
.attr('x', function(d) {
return x(d.pointKey) + x.rangeBand() / 2;
})
.attr('y', function(d) {
return y(d.y0 + d.pointValue) - 5;
})
I'd actually only like to append a text element if a certain property exists in the data.
I have seen the datum selection method in the docs and wondered if this is what I need, I'm unsure how I cancel an append call if the property I'm seeking is not present.
Thanks
Attempt 2
Ok So I have had another stab, this time using the each function like so:
layers.selectAll('text')
.data(function(d) {
return d.dataPointValues;
})
.enter()
//This line needs to be my each function I think?
.append('text')
.each(function(d){
if(d.pointLabel) {
d3.select(this)
.text(function(d) {
return d.pointLabel;
})
.attr('x', function(d) {
return x(d.pointKey) + x.rangeBand() / 2;
})
.attr('y', function(d) {
return y(d.y0 + d.pointValue) - 5;
})
.attr('class', 'data-value')
}
});
}
The problem I now have is that I get a text element added regardless of whether a pointLabel property is present.
It feels like I'm close, I did wonder if I should be moving my append('text') down into the each, but when I tried I got an error as d3 was not expecting that particular chain of calls.
How about using d3's data binding for this.... Rather than appending the text to layers.enter() selection, do the following to the entire layers selection, i.e. including the updating nodes:
labels = layers.selectAll('text')
.data(function(d) {
// d is the datum of the parent, and for this example
// let's assume that the presence of `pointLabel`
// indicates whether the label should be displayed or not.
// You could work in more refined logic for it if needed:
return d.pointLabel ? [d] : [];
})
// The result of the above is that if a label is needed, a binding will
// occur to a single element array containing `d`. Otherwise, it'll bind
// to an empty array. After that binding, using enter, update and exit,
// you get to add, update or even remove text (you might need removal if
// you're updating an existing view whose existing label needs to go away)
labels.enter()
.append("text")
labels
.text(function(d) { d.pointLabel })
.attr('x', function(d) {
return x(d.pointKey) + x.rangeBand() / 2;
})
.attr('y', ...)
labels.exit()
.remove()
The trick here (it's hardly a trick, but it's not a very common d3 use-case) is that it's either binding to a single element array [d] or to a blank one [], which is how you get to use the enter() selection to only create labels where needed. And the benefit of this approach over non-data-binding appproaches is that this code can be called multiple times — whenever a d.pointLabel changes or when the app's state change — and the labels' presense (or lack of presence, ie removal) will update accordingly.

Redrawing the stack bar chat on click on the toggle legend using D3.js

I want to implement stack bar with toggle legend using D3.js ,on click on the legend, stack bar should get redrawn.If the legend was active,rectangle slab corresponding to the legend should get disappear and vise versa.
On click on the legend, I am not able to update the data binded with the group element and rect element present inside the group element properly.
In the DOM tree,on click on the legend,rect element is getting appended and added to first group element, rect element should actually get updated only.
You can view the source code in Jsfiddle here
I want something similar to stack bar with legend selection as implemented here in nvd3
function redraw() {
var legendselector = d3.selectAll("g.rect");
var legendData = legendselector.data();
var columnObj = legendData.filter(function(d, i) {
if (d.active == true)
return d;
});
var remapped = columnObj.map(function(cause) {
return dataArch.map(function(d, i) {
return {
x : d.timeStamp,
y : d[cause.errorType]
};
});
});
var stacked = d3.layout.stack()(remapped);
valgroup = stackBarGroup.selectAll("g.valgroup").data(stacked, function(d) {
return d;
}).attr("class", "valgroup");
valgroup.enter().append("svg:g").attr("class", "valgroup").style("fill",
function(d, i) {
return columnObj[i].color;
}).style("stroke", function(d, i) {
return d3.rgb(columnObj[i].color).darker();
});
valgroup.exit().remove();
rect = valgroup.selectAll("rectangle");
// Add a rect for each date.
rect = valgroup.selectAll("rectangle").data(function(d, i) {
return d;
}).enter().append('rect');
valgroup.exit().remove();
rect.attr("x", function(d) {
return x(d.x);
}).attr("y", function(d) {
return y(d.y0 + d.y);
}).attr("height", function(d) {
return y(d.y0) - y(d.y0 + d.y);
}).attr("width", 6);
}
function redraw() did not use transition inside it
You need to get more understanding about object constancy. (Three state described by the author)
I wrote an example of group chart in d3, the legend is interactable and works well, because i am new to d3, maybe the pattern or standard used is not very formal.
Listed it below only for you reference, hope it helps, good luck :-p
fiddle

D3 why doesn't my data update?

In this code, http://enjalot.com/inlet/4124664/
of which the main part is:
function render(data) {
var nodz = svg.selectAll(".node")
.data(data);
nodz.enter().append("g")
.attr("class", "node")
.attr("id", function(d) { return "id"+d[0]+d[1]; })
.attr("x",0)
.attr("y", 0)
.attr("transform", function(d) {
return "translate(" + x(d[0]) + "," + y(d[1]) + ")";
})
.append("text")
.attr("x", 0)
.attr("y", 0)
.attr("stroke", "black")
.text(function(d) {return d[2]; });
// update
nodz.selectAll("text")
.text(function(d) {
return d[2]; });
// another go
d3.selectAll("text")
.text(function(d) {
return d[2]; });
}
// data in form [x pos, y pos, value to display]
var nodes = [[0,0,0],[1,1,0],[1, -1,0],[2,0,0], [2,2,0]];
render(nodes);
nodes2 = [[0,0,1],[1,1,1],[1, -1,1],[2,0,1], [2,2,1], [2, -2,1]];
render(nodes2);
I call the code to draw some nodes twice.
I expect it to draw five nodes with a value of zero in the first pass,
Then I add another item to the list and update all the values to 1 so expect to see all the values change to 1 and a new node appear. Instead, I'm only seeing the last one being set to 1. I've tried adding a unique id to bind the node to the data but this isn't working. Also tried reselecting to see if the data is now bound. In all the tutorials I've been through, just calling the selectAll().data() part updates the data, what am I missing?
The second optional argument to .data() is a function that tells d3 how to match elements. That's where you need to compare your IDs, see the documentation. That said, it should work without IDs in your case as it matches by index by default.
The problem with updating the text is that after calling .selectAll() you need to call .data() again to let d3 know what you want to match to that selection (i.e. that the new data should be bound to the old data).

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