How to add text to D3 js donut chart - d3.js

I have the following donut chart here in d3.js
Please see here: <https://jsfiddle.net/jz9z9hw1/>
I am unsure of how to add text right in the centre of the donut. I'd like it to say "Test System 1".
Also, how does one go about adding text within the arcs? So, it would display the actual numbers?

Just add a text element to your SVG, like this. I added this to your fiddle, and it added the text right in the middle:
var text = svg.append('text')
.text('Test System 1')
.attr('text-anchor', 'middle')

Related

Linked tooltip on heatmap and sparkline

I created a heatmap and sparklines next to the heatmap.
HERE the Plunker
Now I would like that when the user hovers over a cell of the heatmap, a red dot is displayed on the corresponding sparkline.
On the other hand, when the user hovers over the sparkline, the corresponding cell in the heatmap is highlighted.
I hope it's clearer with some drawings:
I thought I could change the code at this point:
var cells = svg.selectAll('rect')
.data(data)
.enter()
.append('g')
.append('rect')
//...
.on('mouseover', tip.show) // <- HERE
.on('mouseout', tip.hide);
I should keep track of the rectangle on which the mouse is located and somehow pass this data to the piece of code that controls the sparkline.
But I don't really know how to do it and I have not found similar examples.
Thanks!
HERE MY PLUNKER
add this liblary:
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
To solve your problem, you need understand the concept,
The D3 can holding data when you put on it
The D3 can select base on class and id
The DOM element can hold attribute (Ex: attr-id)
Scale linear can be invers, that mean if you have domain you can have range and if you have range you can have domain
Element that draw with D3 is updatable & deletable
understand the liblary you use (d3-tip)
What i Change
i add class and id to element i want to select
if i want to use data, i save data to data-attribute
i make function to track my mouse on Line-chart, and invers it to get value
i draw object tip i want to use
read the code if you want to understand ask me which line you dont understand, if you need explanation

Pie (donut) chart tooltips

I want to use exactly this d3 donut chart.
This 3d chart
However, instead of showing percentage, I'd like to show the raw datas that I am providing.
Ideally, the percentage could be shown (as it is now) and I could show the raw datas for each donut part using an onmouseover tooltip!
Can't make it work.
Thanks a lot for any help!
Are you looking for this,I update the fiddle with tool tip,
Initially add a div to the body i.e.
var div = d3.select("body").append("div").attr("class", "tooltip");
then whenever user makes a mouseover or mousemove on the paths/arcs do the necessary.
have a look in http://jsfiddle.net/Q3dhh/25/

How to change the location of the pie chart in D3?

Now I am trying to build pie charts which can be placed anywhere on the canvas in D3.
However in D3, the pie chart is composed like "[g class="arc][path][/g]",
but neither of "g tag" or "path tag"'s location can be changed.
Is there any solution to change the location of the pie chart on the canvas.
Thank you so much in advance!
You can change the position of an svg object (like a group) element with translate.
For example:
<g transform="translate(20,20)"></g>
Check a live example here: http://jsbin.com/zajij/1/
In d3 you can add an attr to add this transform
.attr("transform", "translate(20,20)");
Hope this helps!

D3.js Bar Chart axis label having select box

We have requirement to add drop down with axis label so that user can change the data from there.We require this drop down box effect on only specific label.
One approach we have tried is to add svg:image with label and the functionality is working fine but the other label is having the down arrow image that is not required. So can anybody help me out how I can select only one label? Actually there are multiple labels and its index is getting changed on chart update. Please find below code which is working for adding images to all labels.
e.g.
g.selectAll('.nv-x.nv-axis').selectAll('.tick.major').append("svg:image").
on("click", click)
.attr("xlink:href", "images/top-bar-logo.png")
.attr("width", 20)
.attr("height", 20).attr("x", -20);
You can use the filter() function to select the ticks that you need to append the image to. The documentation I've linked to has a few examples -- you might be able to do it without filter() by passing a different selector to selectAll().

How can add text to the center of a D3 sunburst diagram

I am using the zoomable sunburst example but I am struggling trying to add a text to the center of the diagram and still make it zoomable.
The idea is that the text in the center will change when I click on a certain arc indicating its length. It seems that the properties of the mouseclick and mouseover dissapear.
This is what I have tried:
path.append("svg:text")
.on("click",click)
.style("font-size","4em")
.style("font-weight","bold")
.text(function(d) { return count_function(data); });
Can someone help me understand how to display the text in th center of the chart without losing the click functionality?
Maybe an easier approach would be to select the "g" that represents the circular centre and add text to it once the chart was been displayed. I have tried this but I am unable to successfylly select just this element (sorry I am new to D3), so back to square one.
It looks like you're trying to insert a text element inside a path element. Try something like this:
svg.select("g").append("svg:text")
.on("click",click)
.style("font-size","4em")
.style("font-weight","bold")
.text(function(d) { return count_function(data); });

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