why my d3 selection index not working - d3.js

here is code fragment from label-drawing function
var legend = d3.select("." + to_chart)
.append("g")
.selectAll("g")
.data(data)
.enter().append("rect")
.attr("width", 20)
.attr("height", 20)
.attr("x", 20)
.attr("y", 20)
.attr("transform", function(d, i){return "translate(0," + i * 30 + ")";})
.attr("style", "stroke: #000; stroke-width: 1px")
.attr("fill", function(d, i) { return color(i); });
var legend = d3.select("." + to_chart)
.append("g")
.attr("class", "t")
.selectAll(".t")
.data(data)
.enter().append("text")
.attr("x", function(data, i){return i;})
.attr("y", 20)
.text(function(i){if (i = 0){
return "eff";
} else if (i = 1) {
return "non-eff";
}
;});
why .attr("x", function(data, i){return i;}) is working, but
.text section not? it always get the '1' value.


Ok, I put an example down...besides the problem I mentioned with the function(d,i){...}, your comparison operator was wrong...you want to use === or == instead of =. So here is the deal:
var data = ["mary","goes"]
var legend = d3.select("body").append("svg").append("g")
.attr("class", "t")
.selectAll(".t")
.data(data)
.enter()
.append("text")
.attr("x", function(d, i){return i * 30;})
.attr("y", 20)
.text(function(d,i){
if (i === 0){
return "eff";
} else if (i === 1) {
return "non-eff";
}
;});
This results in:
eff non-eff

Related

d3 rect in one group interfering with rect in another group

I have a group called groove which has two rects. These are not bound to the data.
I also have a group called group which has many rects which are bound to the data.
In the second group called group there are only three data points, but only two are displaying.
Why is the first one not being rendered?
I have seen this before but can't remember how to solve it.
var margin = {
top: 20,
right: 20,
bottom: 20,
left: 20
},
width = 600 - margin.left - margin.right,
height = 600 - margin.top - margin.bottom;
var svg = d3.select("svg");
var data = [{
x: 200
},
{
x: 300
},
{
x: 400
}
];
var groove = svg.append("g")
.attr("class", "groove_group");
groove.append("rect")
.attr("x", 100)
.attr("y", 150)
.attr("rx", 2)
.attr("ry", 2)
.attr("height", 6)
.attr("width", 800)
.style("fill", "grey");
groove.append("rect")
.attr("x", 102)
.attr("y", 152)
.attr("rx", 2)
.attr("ry", 2)
.attr("height", 2)
.attr("width", 796)
.style("fill", "black");
// create group
var group = svg.selectAll("g")
.data(data)
.enter().append("g")
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
.on("click", removeElement);
group.append("rect")
.attr("x", function(d) {
return d.x;
})
.attr("y", 100)
.attr("height", 100)
.attr("width", 15)
.style("fill", "lightblue")
.attr('id', function(d, i) {
return 'handle_' + i;
})
.attr("rx", 6)
.attr("ry", 6)
.attr("stroke-width", 2)
.attr("stroke", "black");
group.append("text")
.attr("x", function(d) {
return d.x
})
.attr("y", 100)
.attr("text-anchor", "start")
.style("fill", "black")
.text(function(d) {
return "x:" + d.x
});
function dragstarted(d) {
d3.select(this).raise().classed("active", true);
}
function dragged(d) {
d3.select(this).select("text")
.attr("x", d.x = d3.event.x);
d3.select(this).select("rect")
.attr("x", d.x = d3.event.x);
}
function dragended(d) {
d3.select(this)
.classed("active", false);
}
function removeElement(d) {
d3.event.stopPropagation();
data = data.filter(function(e) {
return e != d;
});
d3.select(this)
.remove();
}
<svg width="960" height="500"></svg>
<script src="//d3js.org/d3.v4.min.js"></script>

When you do this:
var group = svg.selectAll("g")
You are selecting a previously existing group (which is groove). Therefore, your enter selection has one less element.
Solution
Select nothing:
var group = svg.selectAll(null)
Here is your code with that change:
var margin = {
top: 20,
right: 20,
bottom: 20,
left: 20
},
width = 600 - margin.left - margin.right,
height = 600 - margin.top - margin.bottom;
var svg = d3.select("svg");
var data = [{
x: 200
}, {
x: 300
}, {
x: 400
}];
var groove = svg.append("g")
.attr("class", "groove_group");
groove.append("rect")
.attr("x", 100)
.attr("y", 150)
.attr("rx", 2)
.attr("ry", 2)
.attr("height", 6)
.attr("width", 800)
.style("fill", "grey");
groove.append("rect")
.attr("x", 102)
.attr("y", 152)
.attr("rx", 2)
.attr("ry", 2)
.attr("height", 2)
.attr("width", 796)
.style("fill", "black");
// create group
var group = svg.selectAll(null)
.data(data)
.enter().append("g")
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
.on("click", removeElement);
group.append("rect")
.attr("x", function(d) {
return d.x;
})
.attr("y", 100)
.attr("height", 100)
.attr("width", 15)
.style("fill", "lightblue")
.attr('id', function(d, i) {
return 'handle_' + i;
})
.attr("rx", 6)
.attr("ry", 6)
.attr("stroke-width", 2)
.attr("stroke", "black");
group.append("text")
.attr("x", function(d) {
return d.x
})
.attr("y", 100)
.attr("text-anchor", "start")
.style("fill", "black")
.text(function(d) {
return "x:" + d.x
});
function dragstarted(d) {
d3.select(this).raise().classed("active", true);
}
function dragged(d) {
d3.select(this).select("text")
.attr("x", d.x = d3.event.x);
d3.select(this).select("rect")
.attr("x", d.x = d3.event.x);
}
function dragended(d) {
d3.select(this)
.classed("active", false);
}
function removeElement(d) {
d3.event.stopPropagation();
data = data.filter(function(e) {
return e != d;
});
d3.select(this)
.remove();
}
<script src="https://d3js.org/d3.v4.min.js"></script>
<svg width="960" height="500"></svg>

Unable to change x position of legend text inside a group element using D3

I am trying to create a horizontal graph legend in D3.js. I am using a group element (g) as a container for all the legends and the individual legends (text) are also each wrapped inside a "g" element. The result is that the individual legends are stacked on top of each other rather than spaced out.
I have tried changing the x attribute on the legends and also transform/translate. Whilst the DOM shows that the x values are applied the legends don't move. So if the DOM shows the legend / g element is positioned at x = 200 it is still positioned at 0.
I have spent two days trying to solve this and probably looked at over 50 examples including anything I could find on StackExchange.
Below code is my latest attempt. It doesn't through any error and the x values are reflected in the DOM but the elements just won't move.
I have included the code covering the relevant bits (but not all code).
The legend container is added here:
/*<note>Add container to hold legends. */
var LegendCanvas = d3.select("svg")
.append("g")
.attr("class", "legend canvas")
.attr("x", 0)
.attr("y", 0)
.attr("width", Width)
.style("fill", "#ffcccc")
.attr("transform", "translate(0,15)");
There is then a loop through a json array of objects:
var PrevElemLength = 0;
/*<note>Loop through each data series, call the Valueline variable and plot the line. */
Data.forEach(function(Key, i) {
/*<note>Add the metric line(s). */
Svg.append("path")
.attr("class", "line")
.attr("data-legend",function() { return Key.OriginId })
/*<note>Iterates through the data series objects and applies a different color to each line. */
.style("stroke", function () {
return Key.color = Color(Key.UniqueName); })
.attr("d", Valueline(Key.DataValues));
/*<note>Add a g element to the legend container. */
var Legend = LegendCanvas.append("g")
.attr("class", "legend container")
.attr("transform", function (d, i) {
if (i === 0) {
return "translate(0,0)"
} else {
PrevElemLength += this.previousElementSibling.getBBox().width;
return "translate(" + (PrevElemLength) + ",0)"
}
});
/*<note>Adds a rectangle to pre-fix each legend. */
Legend.append("rect")
.attr("width", 5)
.attr("height", 5)
.style("fill", function () {
return Key.color = Color(Key.UniqueName); });
/*<note>Adds the legend text. */
Legend.append("text")
.attr("x", function() {
return this.parentNode.getBBox().width + 5;
})
/*.attr("y", NetHeight + (Margin.bottom/2)+ 10) */
.attr("class", "legend text")
.style("fill", function () {
return Key.color = Color(Key.UniqueName); })
.text(Key.UniqueName);
Here is a screen shot of what the output looks like:
enter image description here
Any help on how to create a horizontal legend (without over lapping legends) would be much appreciated. Chris

The problem is you are using local variables d and i as function parameters while setting the transform attribute. Parameter i in local scope overrides the actual variable. The value of local variable i would be always zero as there is no data bind to that element.
var Legend = LegendCanvas.append("g")
.attr("class", "legend container")
.attr("transform", function (d, i) { //Remove i
if (i === 0) {
return "translate(0,0)"
} else {
PrevElemLength += this.previousElementSibling.getBBox().width;
return "translate(" + (PrevElemLength) + ",0)"
}
});
I have also made slight updates to the code for improvements.
var LegendCanvas = d3.select("svg")
.append("g")
.attr("class", "legend canvas")
.attr("x", 0)
.attr("y", 0)
.attr("width", 500)
.style("fill", "#ffcccc")
.attr("transform", "translate(0,15)");
var PrevElemLength = 0;
var Data = [{
OriginId: 1,
UniqueName: "Some Long Text 1"
}, {
OriginId: 2,
UniqueName: "Some Long Text 2"
}];
/*<note>Loop through each data series, call the Valueline variable and plot the line. */
var Color = d3.scale.category10();
Data.forEach(function(Key, i) {
/*<note>Add a g element to the legend container. */
var Legend = LegendCanvas.append("g")
.attr("class", "legend container")
.attr("transform", function() {
if (i === 0) {
return "translate(0,0)"
} else {
var marginLeft = 5;
PrevElemLength += this.previousElementSibling.getBBox().width;
return "translate(" + (PrevElemLength + marginLeft) + ",0)"
}
});
/*<note>Adds a rectangle to pre-fix each legend. */
Legend.append("rect")
.attr("width", 5)
.attr("height", 5)
.style("fill", function() {
return Key.color = Color(Key.UniqueName);
});
/*<note>Adds the legend text. */
Legend.append("text")
.attr("x", function() {
return this.parentNode.getBBox().width + 5;
})
.attr("dy", "0.4em")
.attr("class", "legend text")
.style("fill", function() {
return Key.color = Color(Key.UniqueName);
})
.text(Key.UniqueName);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<svg height=500 width=500></svg>
The d3 way of implementation(Using data binding) would be as follows
var LegendCanvas = d3.select("svg")
.append("g")
.attr("class", "legend canvas")
.attr("x", 0)
.attr("y", 0)
.attr("width", 500)
.style("fill", "#ffcccc")
.attr("transform", "translate(0,15)");
var Data = [{
OriginId: 1,
UniqueName: "Some Long Text 1"
}, {
OriginId: 2,
UniqueName: "Some Long Text 2"
}];
var Color = d3.scale.category10();
var Legend = LegendCanvas.selectAll(".legend")
.data(Data)
.enter()
.append("g")
.attr("class", "legend container");
Legend.append("rect")
.attr("width", 5)
.attr("height", 5)
.style("fill", function(Key) {
return Key.color = Color(Key.UniqueName);
});
Legend.append("text")
.attr("x", function() {
return this.parentNode.getBBox().width + 5;
})
.attr("dy", "0.4em")
.attr("class", "legend text")
.style("fill", function(Key) {
return Key.color = Color(Key.UniqueName);
})
.text(function(Key){ return Key.UniqueName });
var PrevElemLength = 0;
Legend.attr("transform", function(d, i) {
if (i === 0) {
return "translate(0,0)"
} else {
var marginLeft = 5;
PrevElemLength += this.previousElementSibling.getBBox().width;
return "translate(" + (PrevElemLength + marginLeft) + ",0)"
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<svg width=500 height=500></svg>

Try this :
//Legend
var legend = vis.selectAll(".legend")
.data(color.domain())
.enter().append("g")
.attr("class", "legend")
.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
legend.append("image")
.attr("x", 890)
.attr("y", 70)
.attr("width", 20)
.attr("height", 18)
.attr("xlink:href",function (d) {
return "../assets/images/dev/"+d+".png";
})
legend.append("text")
.attr("x", 910)
.attr("y", 78)
.attr("dy", ".35em")
.style("text-anchor", "start")
.text(function(d) {
return d;
});

How Can I Use Symbols With a Legend

I've got a legend, with colored rectangles...
I'd like to replace the rectangles with symbols (i.e., circle, cross, diamond, square). I can't figure out how to do that.
I've been using variations of .attr("d", d3.svg.symbol().type('circle'). For instance, I tried:
legendRect
.attr("d", d3.svg.symbol().type(function (d) { return d[2] })
and I tried:
legendRect.append("svg:path")
.attr("d", d3.svg.symbol().type((d: any) => { return d[2] }))
d[2] is "supposed to be" pulling from legendData, as shown in the below code example...like it does with d[1] for the fill.
But I don't ever see anything change.
Here's the code I'm using for the legend, without the symbol stuff, below. What am I doing wrong and how can I change the rectangles to symbols? Where do I need to add what?
var legendData = [["OA", "yellow", "circle"], ["OI", "blue", "cross"], ["RARC", "green", "diamond"], ["CAPE", "red", "square"], ["Other", "black", "triangleDown"]];
var legend = this.svg.append("g")
.attr("class", "legend")
.attr("height", 0)
.attr("width", 0)
.attr('transform', 'translate(-20,250)');
var legendRect = legend.selectAll('rect').data(legendData);
legendRect.enter()
.append("rect")
.attr("x", width - 65)
.attr("width", 10)
.attr("height", 10)
;
legendRect
.attr("y", function (d, i) {
return i * 20;
})
.style("fill", function (d) {
return d[1];
})
var legendText = legend.selectAll('text').data(legendData);
legendText.enter()
.append("text")
.attr("x", width - 52);
legendText
.attr("y", function (d, i) {
return i * 20 + 9;
})
.text(function (d) {
return d[0];
});

Here's how I would code it. Notice, that I data-bind to a wrapper g element and then place the symbol and text into it for each legend item. You can then position the g instead of positioning the text and "symbol" separately. This also removes the need for double-binding the data.
var legendData = [["OA", "yellow", "circle"], ["OI", "blue", "cross"], ["RARC", "green", "diamond"], ["CAPE", "red", "square"], ["Other", "black", "triangleDown"]];
var svg = d3.select('body').append('svg').attr('width', 500).attr('height', 500);
var legend = svg.append('g')
.attr("class", "legend")
.attr("height", 0)
.attr("width", 0)
.attr('transform', 'translate(20,20)');
var legendRect = legend
.selectAll('g')
.data(legendData);
var legendRectE = legendRect.enter()
.append("g")
.attr("transform", function(d,i){
return 'translate(0, ' + (i * 20) + ')';
});
legendRectE
.append('path')
.attr("d", d3.svg.symbol().type((d) => { return d[2] }))
.style("fill", function (d) {
return d[1];
});
legendRectE
.append("text")
.attr("x", 10)
.attr("y", 5)
.text(function (d) {
return d[0];
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

This is a implementation which uses symbols for your legend. You can use the symbols like the following:
svg.selectAll('.symbol')
.data(legendData)
.enter()
.append('path')
.attr('transform', function(d, i) {
return 'translate(' + (20) + ',' + ((i * 20) + 10) + ')';
})
.attr('d', d3.symbol().type(function(d, i) {
if (d[2] === "circle") {
return d3.symbolCircle;
} else if (d[2] === "cross") {
return d3.symbolCross;
} else if (d[2] === "diamond") {
return d3.symbolDiamond;
} else if (d[2] === "square") {
return d3.symbolSquare;
} else {
return d3.symbolTriangle;
}
})
.size(100))
.style("fill", function(d) {
return d[1];
});
Then you can set your legend labels like the following:
svg.selectAll('.label')
.data(legendData)
.enter()
.append('text')
.attr("x", "40")
.attr("y", function(d, i){ return ((i * 20)+15);})
.text(function(d) {
return d[0];
});
Check fiddle here - https://jsfiddle.net/zoxckLe3/
P.S. - Above solution uses d3 v4. To achieve the same in v3, use the following line .attr('d', d3.svg.symbol().type(function(d){return d[2];})) instead of the part where I match d[2] to the symbol name.

For adding image icons, you can use below code.
legend.append("**image**")
.attr("x", 890)
.attr("y", 70)
.attr("width", 20)
.attr("height", 18)
.attr("xlink:href",function (d) {
**return "../assets/images/dev/"+d+".png";**
})
This works for me..

D3, get X values (date) from multiple Y values, create text

I have searched through many answers about getting X (date) values given a Y. Most revolve around the scale.invert() function. However, I am having trouble implementing this in my task.
Task: I am creating a hydrograph (time-series line graph of water level). I'm also plotting min/max points, and median line, all with text labels. See first image. This is a 'proof of concept', so I'm ok with things being a little dirty.
Problem: I want to add the corresponding dates for those min/max points, and I can't figure out how. One caveat, sometimes there are multiple points with same min or max value. I am unable to: A) get the correct date for the point, and B) add the date for each instance (all mins and maxes, if there are multiples) to the text. Thanks for any help or direction.
Some of the code (that I think is immediately relevant) is below. Here's the codepen. I'm sure it's not pretty, I'm new to D3 and javascript.
...
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("Water Level (ft)");
svg.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
var extent = d3.extent(data, function(d) {
return d.level
})
var min = extent[0]
var max = extent[1]
var median = d3.median(data, function(d) {
return d.level
})
var medianLine = svg.append("line")
.attr("class", "medianLine")
.attr("y1", y(median))
.attr("y2", y(median))
.attr("x1", 0)
.attr("x2", width)
var points = svg.selectAll("g")
.data(data)
.enter()
.append("g")
.filter(function(d) {
return d.level === min || d.level === max;
})
points.append("circle")
.attr("class", "dot")
.attr("cx", function(d) {
return x(d.date);
})
.attr("cy", function(d) {
return y(d.level);
})
.attr("r", 5)
points.append("text")
.attr("x", function(d) {
return x(d.date);
})
.attr("y", -20)
.attr("font-family", "sans-serif")
.attr("font-size", "12px")
.style("text-anchor", "middle")
points.selectAll("circle")
.style("fill", function(d) {
if (d.level === min) {
return "red"
} else {
return "#009933"
};
});
points.selectAll("text")
.text(function(d) {
if (d.level === min) {
return "Min: " + min
} else if (d.level === max) {
return "Max: " + max
}
})
.style("fill", function(d) {
if (d.level === min) {
return "red"
} else if (d.level === max) {
return "#246B24"
}
})
svg.append("text")
.attr("transform", "translate(" + (width + 3) + "," + y(median) + ")")
.attr("dy", ".35em")
.attr("text-anchor", "start")
.style("fill", "#cc6600")
.text(function(d) {
return "Median: " + median
})
...

Well after a quick peek to the code the date is a property of your data so there should not be any problem accessing it e.g.
points.selectAll("text")
.text(function(d) {
// date is accessible through d.date
if (d.level === min) {
return "Min: " + min + ' ' + d.date
} else if (d.level === max) {
return "Max: " + max + ' ' + d.date
}
})
If you want to format the date you can read about time formatting in d3

updating labels when switching dataset (+removing older one)

I've been drawing a planetarium with planets and labels on it :
svg.append("circle").attr("r", 20).attr("cx", w/2)
.attr("cy", h/2).attr("class", "sun");
svg.append("text").attr("x", w/2)
.attr("y", h/2).attr("text-anchor", "middle").attr("fill", "grey").text("VICTOR HUGO");
var container = svg.append("g")
.attr("transform", "translate(" + w/2 + "," + h/2 + ")")
var orbit = container.selectAll(".orbit")
.data(dataset, key)
.enter()
.append("circle")
.attr("class", "orbit")
.attr("r", 0);
//function(d) {return (d.key * ((w/2)/151) + 20); });
var planets = container.selectAll(".planet")
.data(dataset, key)
.enter()
.append("circle")
.attr("class", "planet")
.attr("r", function(d) {return 5;})
.attr("cx", function(d) {return d.x; })
.attr("cy", function(d) {return d.y; })
.on("mouseover", function(d, i) {
stopTooltip = false
showTooltip(d);
});
d3.select("svg").on("click", function(d) {stopTooltip = true;});
var texts = container.selectAll(".text")
.data(dataset, key)
.enter()
.append("text")
.attr("class", "text")
.attr("dx", function(d) {return d.x;})
.attr("dy", ".35em")
.text(function(d) {return d.titre});
Then, I've been adding a legend and a click function, so that when you click on one or another of the legend subtitle, the dataset is updated (if you look at the tooltips, it is indeed updated).
////////////////////////Legend//////////////////////////////////
update = function(newDataset, key){
var newplanets = container.selectAll(".planet").data(newDataset, key);
newplanets.enter().append("circle");
newplanets.transition()
.duration(0)
.attr("r", function(d) {return 5;})
.attr("cx", function(d) {return d.x; })
.attr("cy", function(d) {return d.y; })
.on("mouseover", function(d, i) {
stopTooltip = false
showTooltip(d);
});
newplanets.exit().remove();
var newtexts = container.selectAll(".text").data(newDataset, key);
newtexts.enter().append("text");
newtexts.transition()
.duration(0)
.attr("class", "text")
.attr("dx", function(d) {return d.x;})
.attr("dy", ".35em")
.text(function(d) {return d.titre});
newtexts.exit().remove();
}
var legendRectSize = 7;
var legendSpacing = 20;
var VictorHugoClass = [
{ "VHClassName": '...Auteur (oeuvre)', "VHClass": r990o, "color": "#0000FF" },
{ "VHClassName": '...Auteur (expression)', "VHClass": r990e, "color": "#FBA10D" },
];
//Initiate container around Legend
var legendContainer = svg.append("g").attr("class","legendContainer")
.attr("transform", "translate(" + 30 + "," + (h - 90) + ")");
//Create title of Legend
var legendTitle = legendContainer.append('text')
.attr('x', 0)
.attr('y', legendRectSize - legendSpacing)
.attr("dy", "1em")
.attr('class', 'legendTitle')
.attr('transform', function() {
var height = legendRectSize + legendSpacing;
var offset = height * VictorHugoClass.length / 2;
var horz = -2 * legendRectSize;
var vert = -2.3 * height - offset;
return 'translate(' + horz + ',' + vert + ')';
})
.attr("fill", "black")
.text("Victor Hugo en tant que...")
.call(wrap, 200);
//Create container per circle/text pair
var legend = legendContainer
.selectAll('.legend')
.data(VictorHugoClass)
.enter()
.append('g')
.attr('class', 'legend')
.attr('transform', function(d, i) {
var height = legendRectSize + legendSpacing;
var offset = height * VictorHugoClass.length / 2;
var horz = -2 * legendRectSize;
var vert = i * height - offset;
return 'translate(' + horz + ',' + vert + ')';
})
.on("click", function(d) {
update(d.VHClass, d.key);
});
//Append circles to Legend
legend.append('circle')
.attr('r', legendRectSize)
.attr('cx', 4)
.attr('cy', legendRectSize/2 - legendSpacing)
.attr("opacity", 1)
.style("fill", "white")
.style('stroke', function(d) {return d.color;});
//Append text to Legend
legend.append('text')
.attr('x', legendRectSize + legendSpacing/2)
.attr('y', legendRectSize - legendSpacing)
.attr("fill", "black")
.text(function(d) { return d.VHClassName; });
Nevertheless, the labels won't update with the planets, and some of the data of the former dataset are still remaining when the second dataset is loaded into the visualization. My Plunker is here for more details : http://plnkr.co/edit/UnhqCZhME7ymxdIbpcIj?p=preview
Thank you very much for your help in this...

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