D3js: Unable to set drag behaviour to chess pieces - d3.js

Problem Solved == use d3.drag() instead of d3.behaviour.drag() and use d3-drag.v1.min.js
I have set up a SVG chess board with D3js using for loop to go through each row and each column. I used unicode for chess pieces so each chess pieces is a svg element.
I am trying to drag chess pieces with drag behaviour of D3js but not possible.
All chess pieces have class "draggable". So I created the drag and attached it to all elements with class "draggable"
var drag = d3.behavior.drag()
.origin(function() {
var t = d3.select(this);
return {x: t.attr("x"), y: t.attr("y")};
})
.on("dragstart", function() {
d3.event.sourceEvent.stopPropagation(); // silence other listeners
})
.on("drag", function(d,i) {
d3.select(this)
.attr("x", d3.event.x)
.attr("y", d3.event.y);
});
d3.selectAll(".draggable").call(drag);
My full code is here http://codepen.io/linhnt1516/pen/ZeGoNj?editors=0011
Also, I have tried to use the same drag function with and svg elements in other examples. Check out this code pen http://codepen.io/linhnt1516/pen/VpvobE?editors=0011 and drag the text and the box.
I have been looking through tons of drag examples of D3js but none of them works with the chess piece case.
Anyone has any solution or idea where things may go wrong here.

I haven't fully understand the differences between D3 v4 and D3 v3 drag behaviour or what is the actual problem with behaviour.drag()
Before I used D3 v3 and set up
var drag = d3.behaviour.drag()
This doesn't work as described in the question.
However I found a support d3 script which is d3-drag.v1.min.js
<script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script>
So when I added this one and set up
var drag = d3.drag()
The detailed code of drag is the same as above, just different initialization syntax. The drag functionality now works correctly. If anyone knows why .behaviour.drag() doesn't work and what is the actual differences between my old code and the new working one, please enlighten me.

Related

are there any way to change c3js stacked area chart opacity on mouse hover

I have a question regarding c3.js.
Currently, we are using c3js to display a stacked area chart, that is pretty fine, but our client asked us if we can change the individual area's opacity when customer is mouse hovering one area.
I could not find any solution for this, and hope to hear your suggetions.
Thanks
Try adding this after you've set up your chart -->
d3.selectAll(".c3-area")
.style ("pointer-events", "all")
.on("mouseover", function (d) { return d3.select(this).style("opacity", 0.6)})
.on("mouseout", function (d) { return d3.select(this).style("opacity", 0.2)})
;
The pointer-events setting is the important bit as by default most of the elements in the c3 chart are styled to ignore them.
Add it to the end of the c3 example to see it working --> https://c3js.org/samples/chart_area.html

How to apply tooltips for dc.js chart after chart is rendered

I have multiple row charts (crossfilter + dc) and I want to customize the tooltip using d3-tip.
So basically the relevant code is:
rowtip = d3.tip()
.attr('class', 'd3-tip')
.offset([-10, 0])
.html(function (d) { return d.key + ": " + d.value; });
...my dc charts ...
... then at the bottom of my script tags ...
d3.selectAll('g.row').call(rowtip);
d3.selectAll('g.row').on('mouseover', rowtip.show);
The code seems work, but the mouseover event doesn't get triggered automatically and the tooltips don't get displayed when the page loads.
But If I run the last line (mouseover) on the console, then everything works as expected.
So my question would be how can I make sure the mouseover event gets triggered when the page loads. I tried Jquery $(document).ready(....), but that didn't work.
It has to have something to do with the order in which the elements are loaded... I guess. But I'm not an expert in javascript and much less in d3.
Thanks in advance.
Your way works fine but here is the idiomatic dc.js way to do it:
chart.on('pretransition.add-tip', function(chart) {
chart.selectAll('g.row')
.call(rowtip)
.on('mouseover', rowtip.show)
.on('mouseout', rowtip.hide);
});
The pretransition event fires after the chart is rendered or redrawn. add-tip is an event namespace to avoid interfering with anything else which may be watching this event.
chart.selectAll selects only items within the chart, to avoid accidental tooltips elsewhere in the page.
Here seems similar to your requirement, check it
http://bl.ocks.org/phil-pedruco/9032348
So I was able to solve this by using jquery after all. Seems a bit hacky, but it does what I need.
Basically I am forcing the call of the d3-tip function on mouseover of the html body.
var rowtip = d3.tip()
.attr('class', 'd3-tip')
.offset([-10, 0])
.html(function(d){return d.key;})
$('body').on('mouseover', function(){
d3.selectAll('g.row')
.call(rowtip)
.on('mouseover', rowtip.show)
.on('mouseout', rowtip.hide);
});

D3JS Circle on top of each other [duplicate]

What is an effective way to bring an SVG element to the top of the z-order, using the D3 library?
My specific scenario is a pie chart which highlights (by adding a stroke to the path) when the mouse is over a given piece. The code block for generating my chart is below:
svg.selectAll("path")
.data(d)
.enter().append("path")
.attr("d", arc)
.attr("class", "arc")
.attr("fill", function(d) { return color(d.name); })
.attr("stroke", "#fff")
.attr("stroke-width", 0)
.on("mouseover", function(d) {
d3.select(this)
.attr("stroke-width", 2)
.classed("top", true);
//.style("z-index", 1);
})
.on("mouseout", function(d) {
d3.select(this)
.attr("stroke-width", 0)
.classed("top", false);
//.style("z-index", -1);
});
I've tried a few options, but no luck so far. Using style("z-index") and calling classed both did not work.
The "top" class is defined as follows in my CSS:
.top {
fill: red;
z-index: 100;
}
The fill statement is there to make sure I knew it was turning on/off correctly. It is.
I've heard using sort is an option, but I'm unclear on how it would be implemented for bringing the "selected" element to the top.
UPDATE:
I fixed my particular situation with the following code, which adds a new arc to the SVG on the mouseover event to show a highlight.
svg.selectAll("path")
.data(d)
.enter().append("path")
.attr("d", arc)
.attr("class", "arc")
.style("fill", function(d) { return color(d.name); })
.style("stroke", "#fff")
.style("stroke-width", 0)
.on("mouseover", function(d) {
svg.append("path")
.attr("d", d3.select(this).attr("d"))
.attr("id", "arcSelection")
.style("fill", "none")
.style("stroke", "#fff")
.style("stroke-width", 2);
})
.on("mouseout", function(d) {
d3.select("#arcSelection").remove();
});
As explained in the other answers, SVG does not have a notion of a z-index. Instead, the order of elements in the document determines the order in the drawing.
Apart from reordering the elements manually, there is another way for certain situations:
Working with D3 you often have certain types of elements that should always be drawn on top of other types of elements.
For example, when laying out graphs, links should always be placed below nodes. More generally, some background elements usually need to be placed below everything else, while some highlights and overlays should be placed above.
If you have this kind of situation, I found that creating parent group elements for those groups of elements is the best way to go. In SVG, you can use the g element for that. For example, if you have links that should be always placed below nodes, do the following:
svg.append("g").attr("id", "links")
svg.append("g").attr("id", "nodes")
Now, when you paint your links and nodes, select as follows (the selectors starting with # reference the element id):
svg.select("#links").selectAll(".link")
// add data, attach elements and so on
svg.select("#nodes").selectAll(".node")
// add data, attach elements and so on
Now, all links will always be appended structurally before all node elements. Thus, the SVG will show all links below all nodes, no matter how often and in what order you add or remove elements. Of course, all elements of the same type (i.e. within the same container) will still be subject to the order in which they were added.
One of the solutions presented by the developer is: "use D3's sort operator to reorder the elements." (see https://github.com/mbostock/d3/issues/252)
In this light, one might sort the elements by comparing their data, or positions if they were dataless elements:
.on("mouseover", function(d) {
svg.selectAll("path").sort(function (a, b) { // select the parent and sort the path's
if (a.id != d.id) return -1; // a is not the hovered element, send "a" to the back
else return 1; // a is the hovered element, bring "a" to the front
});
})
Since SVG doesn't have Z-index but use the order of the DOM elements, you can bring it to front by:
this.parentNode.appendChild(this);
You can then e.g. make use of insertBefore to put it back on mouseout. This however requires you to be able to target the sibling-node your element should be inserted before.
DEMO: Take a look at this JSFiddle
The simple answer is to use d3 ordering methods. In addition to d3.select('g').order(), there is .lower() and .raise() in version 4. This changes how your elements appear. Please consult the docs for more information - https://github.com/d3/d3/blob/master/API.md#selections-d3-selection
SVG doesn't do z-index. Z-order is dictated by the order of the SVG DOM elements in their container.
As far as I could tell (and I've tried this a couple of times in the past), D3 doesn't provide methods for detaching and reattaching a single element in order to bring it to the front or whatnot.
There is an .order() method, which reshuffles the nodes to match the order they appear in the selection. In your case, you need to bring a single element to the front. So, technically, you could resort the selection with the desired element in front (or at the end, can't remember which is topmost), and then call order() on it.
Or, you could skip d3 for this task and use plain JS (or jQuery) to re-insert that single DOM element.
I implemented futurend's solution in my code and it worked, but with the large number of elements I was using, it was very slow. Here's the alternative method using jQuery that worked faster for my particular visualization. It relies on the svgs you want on top having a class in common (in my example the class is noted in my data set as d.key). In my code there is a <g> with the class "locations" that contains all of the SVGs I'm re-organizing.
.on("mouseover", function(d) {
var pts = $("." + d.key).detach();
$(".locations").append(pts);
});
So when you hover on a particular data point, the code finds all the other data points with SVG DOM elements with that particular class. Then it detaches and re-inserts the SVG DOM elements associated with those data points.
Wanted to expand on what #notan3xit answered rather than write out an entire new answer (but I don't have enough reputation).
Another way to solve the element order problem is to use 'insert' rather than 'append' when drawing . That way the paths will always be placed together before the other svg elements(this assumes your code already does the enter() for links before the enter() for the other svg elements).
d3 insert api: https://github.com/mbostock/d3/wiki/Selections#insert
It took me ages to find how to tweak the Z-order in an existing SVG. I really needed it in the context of d3.brush with tooltip behavior. In order to have the two features work nicely together (http://wrobstory.github.io/2013/11/D3-brush-and-tooltip.html), you need the d3.brush to be the first in Z-order (1st to be drawn on the canvas, then covered by the rest of the SVG elements) and it will capture all mouse events, no matter what is on top of it (with higher Z indices).
Most forum comments say that you should add the d3.brush first in your code, then your SVG "drawing" code. But for me it was not possible as I loaded an external SVG file. You can easily add the brush at any time and alter the Z-order later on with:
d3.select("svg").insert("g", ":first-child");
In the context of a d3.brush setup it will look like:
brush = d3.svg.brush()
.x(d3.scale.identity().domain([1, width-1]))
.y(d3.scale.identity().domain([1, height-1]))
.clamp([true,true])
.on("brush", function() {
var extent = d3.event.target.extent();
...
});
d3.select("svg").insert("g", ":first-child");
.attr("class", "brush")
.call(brush);
d3.js insert() function API: https://github.com/mbostock/d3/wiki/Selections#insert
Hope this helps!
You can Do like this On Mouse Over You can Pull it to top.
d3.selection.prototype.bringElementAsTopLayer = function() {
return this.each(function(){
this.parentNode.appendChild(this);
});
};
d3.selection.prototype.pushElementAsBackLayer = function() {
return this.each(function() {
var firstChild = this.parentNode.firstChild;
if (firstChild) {
this.parentNode.insertBefore(this, firstChild);
}
});
};
nodes.on("mouseover",function(){
d3.select(this).bringElementAsTopLayer();
});
If You want To Push To Back
nodes.on("mouseout",function(){
d3.select(this).pushElementAsBackLayer();
});
Version 1
In theory, the following should work fine.
The CSS code :
path:hover {
stroke: #fff;
stroke-width : 2;
}
This CSS code will add a stroke to the selected path.
The JS code :
svg.selectAll("path").on("mouseover", function(d) {
this.parentNode.appendChild(this);
});
This JS code first removes the path from the DOM tree and then adds it as the last child of its parent. This makes sure the path is drawn on top of all other children of the same parent.
In practice, this code works fine in Chrome but breaks in some other browsers. I tried it in Firefox 20 on my Linux Mint machine and couldn't get it to work. Somehow, Firefox fails to trigger the :hover styles and I haven't found a way to fix this.
Version 2
So I came up with an alternative. It may be a bit 'dirty', but at least it works and it doesn't require looping over all elements (as some of the other answers).
The CSS code :
path.hover {
stroke: #fff;
stroke-width : 2;
}
Instead of using the :hover pseudoselector, I use a .hover class
The JS code :
svg.selectAll(".path")
.on("mouseover", function(d) {
d3.select(this).classed('hover', true);
this.parentNode.appendChild(this);
})
.on("mouseout", function(d) {
d3.select(this).classed('hover', false);
})
On mouseover, I add the .hover class to my path. On mouseout, I remove it.
As in the first case, the code also removes the path from the DOM tree and then adds it as the last child of its parent.
I solved it by using the raise function.
const raise = (d) => {
d3.select(d).raise()
}
And in the component that you need to raise on hover (along with all its children, just place this.
.on("mouseover", (d) => raise(d.srcElement.parentNode))
Depending on your structure, maybe parentNode is not needed. In this example they used "this" but that didn't work in React. https://codepen.io/_cselig/pen/KKgOppo

How to get the selection which is being dragged in d3.js?

I'm using d3 behavior api to implement some drag and drop functionality on my chart. There're some circles on the chart, what I want to do is make the circles able to move around when user is dragging them.
But I don't know how to get the reference of the circle which is being dragged by user.
In below code, where and how to get the reference of the selection and the current mouse position?
var drag = d3.behavior.drag()
.on("dragstart", function(){
//do some drag start stuff...
console.log('drag start');
})
.on("drag", function(){
//hey we're dragging, let's update some stuff
})
.on("dragend", function(){
//we're done, end some stuff
console.log('drag end');
});
Somebody please help!
You get the current selection from
d3.selection(this)
If you want to get the current mouse position, use this code
d3.mouse(this)
That returns an array, where [0] returns the x position of the mouse, and [1] returns the y position.

Adding a data-* attribute to charts with r2d3.js

I am trying to add data-link attributes within charts created with d3.js, the issue I'm having is once the charts go through r2d3.js for ie8 support the data-link attribute "gets lost" somehow, I'm not sure what happens. Here is my code:
var path = group.selectAll("path")
.data(pie(tempObj))
.enter().append("path")
.attr("data-link", function () { return obj.Name.Target; })
.attr("fill", function (d, i) { return color(i) })
.attr("d", arc)
.on('click', function (d) {
alert('click');
});
The ultimate goal of making the VML shape elements, produced by r2d3.js in the process of converting charts for ie8, interactive breaks jQuery and therefore not worth the trouble. If anyone else is reading this I suggest trying another way of making interactive charts with d3.js and r2d3.js. I have used anchor tags and text within charts to accomplish this.
http://bugs.jquery.com/ticket/7071
http://blogs.microsoft.co.il/blogs/rotemb/archive/2011/04/10/asp-net-mvc-jquery-unobtrusive-ajax-failed.aspx
https://github.com/jquery/jquery/pull/13

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