I have been going through some code I found online for creating and playing with directed graphs in D3 (http://bl.ocks.org/cjrd/6863459). I asked a question about this yesterday - Directed graph - node level CSS styles and that gave me a general idea of how to add CSS styles to SVG objects. However, I am still unable to do what I want. This is because, in the JS file, they seem to use the "nodes" to create "circles" and then render them all in one go instead of looping through them. In the updateGraph function, we have the lines -
// add new nodes
var newGs= thisGraph.circles.enter()
.append("g");
newGs.classed(consts.circleGClass, true)
.attr("transform", function(d){return "translate(" + d.x + "," + d.y + ")";})
.on("mouseover", function(d){
if (state.shiftNodeDrag){
d3.select(this).classed(consts.connectClass, true);
}
})
.on("mouseout", function(d){
d3.select(this).classed(consts.connectClass, false);
})
.on("mousedown", function(d){
thisGraph.circleMouseDown.call(thisGraph, d3.select(this), d);
})
.on("mouseup", function(d){
thisGraph.circleMouseUp.call(thisGraph, d3.select(this), d);
})
.call(thisGraph.drag);
First of all, I am not sure what the .append("g") means here. But more importantly, the line where the CSS class is applied,
newGs.classed(consts.circleGClass, true)
seems to apply the class to all "circles" in one line. Instead, I want to loop through each node and for the circle of that node, apply a CSS style based on attributes of the node (to keep things simple, lets say that it the "title" starts with a certain text, I want to make it a blue circle). I still have no idea how to do this. Can someone help here? Again, the answers to my previous question helped a lot in understanding CSS but this other issue is still blocking me from doing what I want.
Adding comments for more clarity.
// here thisGraph.circles is data selection
//so if the data array has 10 elements in array it will generate 10 g or groups.
var newGs= thisGraph.circles.enter()
.append("g");
//here we are adding classes to the g
newGs.classed(consts.circleGClass, true)
.attr("transform", function(d){return "translate(" + d.x + "," + d.y + ")";})
//attaching mouse event to the group
.on("mouseover", function(d){
if (state.shiftNodeDrag){
d3.select(this).classed(consts.connectClass, true);
}
})
.on("mouseout", function(d){
d3.select(this).classed(consts.connectClass, false);
})
.on("mousedown", function(d){
thisGraph.circleMouseDown.call(thisGraph, d3.select(this), d);
})
.on("mouseup", function(d){
thisGraph.circleMouseUp.call(thisGraph, d3.select(this), d);
})
.call(thisGraph.drag);//attaching drag behavior to the group
What does this line mean?
newGs.classed(consts.circleGClass, true)
This line means to add class to all the created g DOM element or group.
In the code you referring it means circleGClass: "conceptG"
Read this on how to add CSS to DOM in D3
In the code you are appending circle to the group like this
newGs.append("circle")
.attr("r", String(consts.nodeRadius));
So now each group will have a circle.
Next Question
I want to loop through each node and for the circle of that node, apply a CSS style based on attributes of the node
You can iterate through all the circles and add style depending on the data associated with the node like this.
newGs.append("circle")
.attr("r", String(consts.nodeRadius))
.style("fill", function(d){
if(d)//some condition on data
{
return "red";
}
else
return "blue";
});
Question:
if you could tell me how to add CSS classes instead of "red", "blue" it would be every thing I need.
To add class you can do like this.
newGs.append("circle")
.attr("r", String(consts.nodeRadius))
.attr("class", function(d){
function(d){
if(d)//some condition on data
{
return "red";//this will put class red in the node.
}
else
return "blue";//this will put class blue in the node.
});
Another way of doing the same:
newGs.append("circle")
.attr("r", String(consts.nodeRadius))
.classed({
'red': function(d) { return d.condition1 == "something"; },
'blue': function(d) { return d.condition1 != "something"; }
});
Hope this helps!
Related
My AngularJS app uses d3.js to draw a nice chart.
While drawing this chart, it uses paints some text on the screen.
I want to change that text when someone clicks on it based on the boolean value of myCondition. This is how I do it:
var nodeEnter = node.enter()
var myLabel = nodeEnter.append("text")
.attr("x", 50)
.attr("dy", "3")
.text("Hello World")
.style("fill-opacity", 0)
.style("cursor", "pointer")
.on("click", function(d) {
if (myCondition)
myLabel.text("Mars");
else
myLabel.text("Venus");
}
);
It sorta works. The value of the text does indeed change from Hello World to Mars or Venus. But there is a problem. This code is called within a recursive function and within a loop. That recursion + loop use the same code to draw numerous such texts on the SVG Container. So when I click this label, not only does it change the text that I want. It also changes the text in other places too! I don't want that. How can I prevent it?
I really just need a way I can address this or myself from within the click function so it knows I'm talking about the object. How?
Without knowing your recursive function and the loop, I'll try two different approaches, I hope that one of them works.
The first one is using this for the click event:
var myLabel = nodeEnter.append("text")
.attr("x", 50)
.attr("dy", "3")
.text("Hello World")
.style("fill-opacity", 0)
.style("cursor", "pointer")
.on("click", function(d) {
if (myCondition)
d3.select(this).text("Mars");
else
d3.select(this).text("Venus");
}
);
If this doesn't work, you can try to set a specific class to your different myLabel texts. Doing this, even if you have several myLabel in your SVG, each one has a unique class. Suppose that index is a specific value for the loop (like i). So, you can try:
var myLabel = nodeEnter.append("text")
.attr("x", 50)
.attr("dy", "3")
.attr("class", "myLabel" + index)//index is any value unique for the loop
.text("Hello World")
.style("fill-opacity", 0)
.style("cursor", "pointer")
.on("click", function(d) {
if (myCondition)
d3.selectAll(".myLabel" + index).text("Mars");
else
d3.selectAll(".myLabel" + index).text("Venus");
}
);
Thanks to previous answers, I've made a map and a related graph with D3js.
The bar and the map are in specific divs, and I don't use the same data source. That's a part of my problem.
For the map, I used queue.js to load several files at a time. One of these files is a .csv which follow specifically the same order than the geojson where polygons are stocked. If I sort differently .csv's data, the correspondance with my .geojson's polygons is bad and my choropleth map become false.
Here's the associated code for the interactive polygons of the map :
svg.append("g").attr("class","zones")
.selectAll("path")
.data(bureaux.features) //"bureaux" is a reference to the geojson
.enter()
.append("path")
.attr("class", "bureau")
.attr("d", path)
.attr("fill", function(d,i){
if (progression[i].diff_ries<-16.1){ //"progression" is the reference to my .csv
return colors[0] // colors is a previous array with the choropleth's colors
}
else if (progression[i].diff_ries<-12.6){
return colors[1]
}
else if (progression[i].diff_ries<-9){
return colors[2]
}
else {return colors[3]
}
})
.on('mouseover', tip.show) // tip.show and tip.hide are specific functions of d3.js.tip
.on('mouseout', tip.hide)
};
No problem here, the code works fine. We arrived now to the graph. He used a .json array called at the beginning of the script, like this
var array=[{"id_bureau":905,"diff_keller":4.05,"diff_ries":-15.02},{etc}];
"id_bureau" is the common' index of my .geojson, my .csv and this .json's array. Then, I sort the array with a specific function. Here's a part of the code associated to the graph :
svg2.selectAll(".bar")
.data(array)
.enter().append("rect")
// I colour on part of the bars like the map
.attr("fill", function(d,i){
if (array[i].diff_ries<-16.1){
return colors[0]
}
else if (array[i].diff_ries<-12.6){
return colors[1]
}
else if (array[i].diff_ries<-9){
return colors[2]
}
else {return colors[3]
}
})
.attr("x", function (d) {
return x(Math.min(0, d.diff_ries));
})
.attr("y", function (d) {
return y(d.id_bureau);
})
.attr("width", function (d) {
return Math.abs(x(d.diff_ries) - x(0));
})
.attr("height", y.rangeBand());
// this part is for the other bars
svg2.selectAll(".bar")
.data(tableau)
.enter().append("rect")
// the others bars are always blue, so I used a simple class
.attr("class", "bar_k")
.attr("x", function (d) {
return x(Math.min(0, d.diff_keller));
})
.attr("y", function (d) {
return y(d.id_bureau);
})
.attr("width", function (d) {
return Math.abs(x(d.diff_keller) - x(0));
})
.attr("height", y.rangeBand());
svg2.append("g")
.attr("class", "x axis")
.call(xAxis);
svg2.append("g")
.attr("class", "y axis")
.append("line")
.attr("x1", x(0))
.attr("x2", x(0))
.attr("y2", height2);
So now, what I wan't to do is, when the mouse is over one polygon, to keep the correspondent bar of the graph more visible than the others with an opacity attribution (and when the mouse out, the opacity of all the graph returns to 1).
Maybe it seems obvious, but I don't get how I can correctly link the map and the graph using the "id_bureau" because they don't follow the same order like in this question : Change class of one element when hover over another element d3.
Does somebody know if I can easily transform the mouseover and mouseout events in the map's part to change at the same time my graph?
To highlight a feature on the map
To perform a focus on one feature, you just need a few line of CSS:
/* Turn off every features */
#carte:hover .bureau {
opacity:0.5;
}
/* Turn on the one you are specifically hovering */
#carte:hover .bureau:hover {
opacity:1;
}
To highlight a bar in your second chart
First of all, you need to distinguish the two kind of bar with two classes :
// First set of bars: .bar_k
svg2.selectAll(".bar_j")
.data(tableau)
.enter().append("rect")
// Important: I use a common class "bar" for both sets
.attr("class", "bar bar_j")
// etc...
// Second set of bars: .bar_k
svg2.selectAll(".bar_k")
.data(tableau)
.enter().append("rect")
.attr("class", "bar bar_k")
// etc...
Then you have to change your mouseenter/mouseleave functions accordingly:
svg.append("g").attr("class","zones")
.selectAll("path")
.data(bureaux.features)
.enter()
// creating paths
// ...
// ...
.on('mouseover', function(d, i) {
// You have to get the active id to highligth the right bar
var id = progression[i].id_bureau
// Then you select every bars (with the common class)
// to update opacities.
svg2.selectAll(".bar").style("opacity", function(d) {
return d.id_bureau == id ? 1 : 0.5;
});
tip.show(d,i);
})
.on('mouseout', function(d, i) {
// To restore the initial states, select every bars and
// set the opcitiy to 1
svg2.selectAll(".bar").style("opacity", 1);
tip.hide(d,i);
});
Here is a demo.
Performance issue
This implementation is kind of slow. You might improve it by toggling an "active" class to the bars you want to highlight.
An other good tail might be to gather the two kinds of bar in a single group that you describe singularly with an id (ie bureau187 for instance). That way you could select directly the bar you want into the mouseenter function and turn it on with an "active" class.
With this class you could mimic the strategy I implemented to highlight a feature and then remove svg2.selectAll(".bar").style("opacity", 1); from the mouseleave function :
/* Turn off every bars */
#carte:hover .bar {
opacity:0.5;
}
/* Turn on the one you want to highligth */
#carte:hover .bar.active {
opacity:1;
}
Please see
http://bl.ocks.org/rkirsling/5001347
It shows some nodes and the edges between them. Can you tell what code to add in that and where so that the edges have labels. You can assume any suitable location for the labels and you can also assume any label text.
Thank you.
You can add labels just as you add the paths for the links themselves. All you need to do is calculate the position according to the positions of the two nodes the link connects. The code would look something like this.
svg.selectAll("text").data(links).enter()
.append("text")
.attr("x", function(d) { return d.source.x + (d.target.x - d.source.x)/2; })
.attr("y", function(d) { return d.source.y + (d.target.y - d.source.y)/2; })
.text(function(d) { return d.something; });
Note that in your tick function, you would also need to update the position of the labels.
I know how to add text element to simple node (append text). The problem is when I would like to add text to path surrounding several nodes. I have created example on http://jsfiddle.net/FEM3e/5/ Please ignore nodes in upper left corner. So I have two groups of nodes. And I would like to add text for each group. Printscreen of desired output http://dopisna.bencin.si/screenshot.png.
I set path in
force.on("tick", function () {
node.attr("transform", function (d) {
return "translate(" + d.x + "," + d.y + ")";
});
vis.selectAll("path")
.data(groups)
.attr("d", singlePath)
.enter().insert("path", "g")
.style("fill", groupFill)
.style("stroke", groupFill)
.style("stroke-width", 57)
.style("stroke-linejoin", "round")
.style("opacity", .7);
});
I have tried appending text with no success. I am asking for some hints.
OK then. The problem is that you're using text instead of textPath. I've modified your fiddle and now there's some text, albeit some rather ugly text, appended to your path.
The only real change I've made is the addition of this snippet:
vis.selectAll("text")
.data(groups)
.enter()
.append("text")
.attr("x", 8)
.attr("dy", 28)
.append("textPath")
.attr("xlink:href", function (d,i) { return "#path_" + i; })
.text(function (d,i) { return "path_" + i; });
You can see that you go through the usual selection and data binding. You then append your text with the attributes you want (definitely change the ones I borrowed from Mikes Bl.ock) and then you append the text path linking it to a path element in the xlink:href attribute. Obviously you then create some text. One of the cool things about textPath is that it allows you append curved paths.
I think that there's a bit of overkill using the groups as data for the textPath, so you might want to select a more appropriate data selection to bind to this.
I have been using D3 to create fancy animated charts, and the examples are great. However, I'm trying to do something seemingly a lot more basic, and having trouble - binding data to a simple list of DIVs.
I set up enter() to initialize elements at opacity 0, transition() to fade them in, and exit() to fade them out and remove them. enter() and exit() seem to be working fine - however, when an update contains an existing element already in the list, it seems to get partially removed - the containing DIV remains, but the contents disappear. I can't understand why the contents of the element would get changed in this way.
My code is as follows:
var data = [...];
sorted = data.sort(function(a, b) { return d3.descending(a.id, b.id); });
var tweet = tweetsBox
.selectAll('div')
.data(sorted, function(d) { return d.id; });
var enterDiv = tweet.enter()
.append("div")
.attr("class", "tweetdiv")
.style("opacity", 0);
enterDiv.append("div")
.attr("class", "username")
.text(function(d) { return "#" + d.username });
enterDiv.append("div")
.attr("class", "displayname")
.text(function(d) { return d.displayname });
enterDiv.append("div")
.attr("class", "date")
.text(function(d) { return d.date });
enterDiv.append("div")
.attr("class", "text")
.text(function(d) { return d.text });
tweet.transition()
.delay(200)
.style("opacity", 1);
tweet.exit()
.transition()
.duration(200)
.style("opacity", 0)
.remove();
I also set up a jsFiddle here demonstrating the issue.
The problem is that you're selecting the divs you created, but create more than one div per data element. When updating, d3 tries to match the data to the nested divs. As you're already assigning a special class to the top-level divs, the fix is very simple. Replace
.selectAll('div')
with
.selectAll('.tweetdiv')