This question already has answers here:
D3 - Getting text on the top of rectangles in Vertical Bar chart
(2 answers)
Closed 4 years ago.
I'm new to d3.js and I'm creating a simple horizontal bar chart with two bars. I want to put text labels on the two bars. The code below looks correct according to my research, but no text shows on the screen. From the dev console, it looks like the text elements are not being added.
Here's the javascript code:
var dataArray = [23, 13];
var svg = d3.select("svg.d3svg")
.attr("height", "20%")
.attr("width", "100%")
.selectAll("rect")
.data(dataArray)
.enter().append("rect")
.attr("height", "7")
.attr("width", "250")
.attr("y", function(d, i) {return (i * 40) + 50 })
.attr("x", "0")
.attr("class", "d3bar");
svg.selectAll("text")
.data(dataArray)
.enter().append("text")
.attr("class", "text-svg")
.text(function(d) {return d})
.attr("x", "0")
.attr("y", function(d, i) {return (i * 40) + 50});
The text-svg class contains only:
.text-svg {
fill: white;
font-family: sans-serif;
}
This correctly code targets the svg element on the html page because the bars are placed where I want them, but I haven't been able to get the text to show.
Thanks for any help.
As per the comment from #rioV8, you need to restructure so that your text and rect nodes are children of a g like so:
var dataArray = [23, 13];
var svg = d3.select("svg")
.attr("height", "20%")
.attr("width", "100%")
var bar = svg.selectAll("g")
.data(dataArray)
.enter().append("g")
var rect = bar.append('rect')
.attr("height", "7")
.attr("width", "250")
.attr("y", function(d, i) {
return (i * 40) + 50
})
.attr("x", "0")
.attr("class", "d3bar");
var text = bar.append('text')
.attr("class", "text-svg")
.text(function(d) {
return d
})
.attr("x", "0")
.attr("y", function(d, i) {
return (i * 40) + 45
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<svg></svg>
This would give you a valid SVG structure like this:
<svg height="20%" width="100%">
<g>
<rect height="7" width="250" y="50" x="0" class="d3bar"></rect>
<text class="text-svg" x="0" y="50">23</text>
</g>
<g>
<rect height="7" width="250" y="90" x="0" class="d3bar"></rect>
<text class="text-svg" x="0" y="90">13</text>
</g>
</svg>
Have a look a look at the docs for SVG rect. It says:
Permitted content: Any number of the following elements, in any order: Animation elements, Descriptive elements
Now have a look at the docs for SVG g. It says:
Permitted content: Any number of the following elements, in any order:
Animation elements, Descriptive elements, Shape elements, Structural elements, Gradient elements
From these usage notes we get exactly what #rioV8 commented: text is not an allowed child tag of rect.
Codepen
Related
I have an svg graph using d3.js, but I'm having trouble with the viewbox. As I have it now, the distance under the graph (30px) is fine, but there is still too much space between the text above the graph (48 px).
I don't have much experience with viewbox yet, so I researched and the best answer I found was at Find svg viewbox that trim whitespace around where the solution was to use the bounding box. That answer involves creating a button to click to show the graph correctly presented, but I want it to be positioned without additional user input.
Here is the html code above the graph:
<h1 class="h1_info">First Entry</h1><br>
<div class="zebra_01">This is the general text to describe the issue.<br><br>
With no further improvements:<ul><li>One item was this tall<br>
</li><li>Another item was that tall</li><li>
<span class="span_00">The first is taller than the second</span></li></ul>
</div>
<svg viewBox="0 0 700 100" preserveAspectRatio="xMinYMid meet" class="d3svg"></svg>
<script src="JS\D3_BarChart.js"></script>
Other html code starts here, 30px below the graph.
Here is the javascript:
var dataArray = [23, 13];
var colors = [ "red", "green" ];
var names = [ "First Name", "Second Name" ];
var widths = [ "5", "700" ]
var dists = ["45", "40"]
var svg = d3.select("svg.d3svg")
.attr("height", "auto")
.attr("width", "100%")
var bar = svg.selectAll("g")
.data(dataArray)
.enter().append("g")
var gradient = svg
.append("linearGradient")
.attr("y1", "0%")
.attr("y2", "20%")
.attr("x1", "0%")
.attr("x2", "25%")
.attr("id", "gradient")
.attr("gradientUnits", "userSpaceOnUse")
gradient
.append("stop")
.attr('class', 'start')
.attr("offset", "0%")
.attr("stop-color", "red")
.attr("stop-opacity", 1);
gradient
.append("stop")
.attr('class', 'end')
.attr("offset", "100%")
.attr("stop-color", "green")
.attr("stop-opacity", 1);
var rect = bar.append('rect')
.attr("height", "7")
.attr("width", function(d, i) { return widths[i] })
.attr("y", function(d, i) { return (i * dists[i]) + 30 })
.attr("x", "0")
.attr("fill", "url(#gradient)")
var text = bar.append('text')
.attr("class", "text-svg")
.text (function(d, i) { return names[i] })
.attr("x", "0")
.attr("y", function(d, i) { return (i * dists[i]) + 55 });
So my question is whether using bounding box is the correct solution, and how can it be set without using a button?
Thanks for any help on this.
Looking at the chart, the first element starts at y =30. You can change the viewBox to be consistent with this fact:
viewBox="0 30 700 100"
Alternatively, if you are not sure about the y coordinates of the first element, you can use d3 to programmatically adjust the viewBox. Here is the relevant piece of your code:
var rect = bar.append('rect')
.attr("height", "7")
.attr("width", function(d, i) { return widths[i] })
.attr("y", function(d, i) { return (i * dists[i]) + 30 })
.attr("x", "0")
.attr("fill", "url(#gradient)")
svg.attr("viewBox", `0 ${rect.attr("y")} 700 100`) //add this. It uses es6 way to interpolate a string
The last line takes the y attribute of the rect (the topmost element in this case) and changes the viewBox accordingly.
I've been using the sample code from this d3 project to learn how to display d3 graphs and I can't seem to get text to show up in the middle of the circles (similar to this example and this example). I've looked at other examples and have tried adding
node.append("title").text("Node Name To Display")
and
node.append("text")
.attr("text-anchor", "middle")
.attr("dy", ".3em").text("Node Name To Display")
right after node is defined but the only results I see is "Node Name To Display" is showing up when I hover over each node. It's not showing up as text inside the circle. Do I have to write my own svg text object and determine the coordinates of that it needs to be placed at based on the coordinates of radius of the circle? From the other two examples, it would seem like d3 already takes cares of this somehow. I just don't know the right attribute to call/set.
There are lots of examples showing how to add labels to graph and tree visualizations, but I'd probably start with this one as the simplest:
http://bl.ocks.org/950642
You haven’t posted a link to your code, but I'm guessing that node refers to a selection of SVG circle elements. You can’t add text elements to circle elements because circle elements are not containers; adding a text element to a circle will be ignored.
Typically you use a G element to group a circle element (or an image element, as above) and a text element for each node. The resulting structure looks like this:
<g class="node" transform="translate(130,492)">
<circle r="4.5"/>
<text dx="12" dy=".35em">Gavroche</text>
</g>
Use a data-join to create the G elements for each node, and then use selection.append to add a circle and a text element for each. Something like this:
var node = svg.selectAll(".node")
.data(nodes)
.enter().append("g")
.attr("class", "node")
.call(force.drag);
node.append("circle")
.attr("r", 4.5);
node.append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name });
One downside of this approach is that you may want the labels to be drawn on top of the circles. Since SVG does not yet support z-index, elements are drawn in document order; so, the above approach causes a label to be drawn above its circle, but it may be drawn under other circles. You can fix this by using two data-joins and creating separate groups for circles and labels, like so:
<g class="nodes">
<circle transform="translate(130,492)" r="4.5"/>
<circle transform="translate(110,249)" r="4.5"/>
…
</g>
<g class="labels">
<text transform="translate(130,492)" dx="12" dy=".35em">Gavroche</text>
<text transform="translate(110,249)" dx="12" dy=".35em">Valjean</text>
…
</g>
And the corresponding JavaScript:
var circle = svg.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(nodes)
.enter().append("circle")
.attr("r", 4.5)
.call(force.drag);
var text = svg.append("g")
.attr("class", "labels")
.selectAll("text")
.data(nodes)
.enter().append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name });
This technique is used in the Mobile Patent Suits example (with an additional text element used to create a white shadow).
I found this guide very useful in trying to accomplish something similar :
https://www.dashingd3js.com/svg-text-element
Based on above link this code will generate circle labels :
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</head>
<body style="overflow: hidden;">
<div id="canvas" style="overflow: hidden;"></div>
<script type="text/javascript">
var graph = {
"nodes": [
{name: "1", "group": 1, x: 100, y: 90, r: 10 , connected : "2"},
{name: "2", "group": 1, x: 200, y: 50, r: 15, connected : "1"},
{name: "3", "group": 2, x: 200, y: 130, r: 25, connected : "1"}
]
}
$( document ).ready(function() {
var width = 2000;
var height = 2000;
var svg = d3.select("#canvas").append("svg")
.attr("width", width)
.attr("height", height)
.append("g");
var lines = svg.attr("class", "line")
.selectAll("line").data(graph.nodes)
.enter().append("line")
.style("stroke", "gray") // <<<<< Add a color
.attr("x1", function (d, i) {
return d.x
})
.attr("y1", function (d) {
return d.y
})
.attr("x2", function (d) {
return findAttribute(d.connected).x
})
.attr("y2", function (d) {
return findAttribute(d.connected).y
})
var circles = svg.selectAll("circle")
.data(graph.nodes)
.enter().append("circle")
.style("stroke", "gray")
.style("fill", "white")
.attr("r", function (d, i) {
return d.r
})
.attr("cx", function (d, i) {
return d.x
})
.attr("cy", function (d, i) {
return d.y
});
var text = svg.selectAll("text")
.data(graph.nodes)
.enter()
.append("text");
var textLabels = text
.attr("x", function(d) { return d.x; })
.attr("y", function(d) { return d.y; })
.text( function (d) { return d.name })
.attr("font-family", "sans-serif")
.attr("font-size", "10px")
.attr("fill", "red");
});
function findAttribute(name) {
for (var i = 0, len = graph.nodes.length; i < len; i++) {
if (graph.nodes[i].name === name)
return graph.nodes[i]; // Return as soon as the object is found
}
return null; // The object was not found
}
</script>
</body>
</html>
If you want to grow the nodes to fit large labels, you can use the getBBox property of an SVG text node after you've drawn it. Here's how I did it, for a list of nodes with fixed coordinates, and two possible shapes:
nodes.forEach(function(v) {
var nd;
var cx = v.coord[0];
var cy = v.coord[1];
switch (v.shape) {
case "circle":
nd = svg.append("circle");
break;
case "rectangle":
nd = svg.append("rect");
break;
}
var w = 10;
var h = 10;
if (v.label != "") {
var lText = svg.append("text");
lText.attr("x", cx)
.attr("y", cy + 5)
.attr("class", "labelText")
.text(v.label);
var bbox = lText.node().getBBox();
w = Math.max(w,bbox.width);
h = Math.max(h,bbox.height);
}
var pad = 4;
switch (v.shape) {
case "circle":
nd.attr("cx", cx)
.attr("cy", cy)
.attr("r", Math.sqrt(w*w + h*h)/2 + pad);
break;
case "rectangle":
nd.attr("x", cx - w/2 - pad)
.attr("y", cy - h/2 - pad)
.attr("width", w + 2*pad)
.attr("height", h + 2*pad);
break;
}
});
Note that the shape is added, the text is added, then the shape is positioned, in order to get the text to show on top.
I am trying to implement annotations on my scatterplot using d3.js v3. I want to insert a text box when I click on the text labels on my chart. For which I wrote this code:
circleGroup.selectAll("text")
.data(data)
.enter()
.append("text")
.text(function (d) {
if (d.label) {
return d.label;
}
return "";
})
.attr("x", function (d) {
return x(d.time) + 6;
})
.attr("y", function (d) {
return y(d.plotY) + 4;
})
.attr("font-size", "10px")
.attr("fill", "#2d3d45")
.on("click", function(d) {
d3.select(this).append("input").attr("type", "text").attr("name", "textInput").attr("value", "Text goes here");
});
The selection of the text element is working correctly. Its just not popping text box when i click on the text labels. Where am i going wrong? Is my approach not in right direction ?
You cannot append html element into svg. The only way to do it - use foreignObject element.
The foreignObject SVG element allows for inclusion of a foreign XML
namespace which has its graphical content drawn by a different user
agent. The included foreign graphical content is subject to SVG
transformations and compositing.
Look at the very simplified example:
var texts = ['foo', 'bar'];
var container = d3.select('g');
container
.selectAll('text')
.data(texts)
.enter()
.append('text')
.text(function(d) { return d; })
.attr('y', function(d,i) { return 50 * i })
.on('click', function(d,i) {
container
.append("foreignObject")
.attr("x", 0)
.attr("y", function() { return 50 * i })
.attr("width", 140)
.attr("height", 20)
.html(function(d) {
return '<input type="text" value="Text goes here" />'
})
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<div style="font-size: 12px;">Click on the texts below:</div>
<svg width="300" heigth="400">
<g transform="translate(20, 20)">
</g>
</svg>
I've been using the sample code from this d3 project to learn how to display d3 graphs and I can't seem to get text to show up in the middle of the circles (similar to this example and this example). I've looked at other examples and have tried adding
node.append("title").text("Node Name To Display")
and
node.append("text")
.attr("text-anchor", "middle")
.attr("dy", ".3em").text("Node Name To Display")
right after node is defined but the only results I see is "Node Name To Display" is showing up when I hover over each node. It's not showing up as text inside the circle. Do I have to write my own svg text object and determine the coordinates of that it needs to be placed at based on the coordinates of radius of the circle? From the other two examples, it would seem like d3 already takes cares of this somehow. I just don't know the right attribute to call/set.
There are lots of examples showing how to add labels to graph and tree visualizations, but I'd probably start with this one as the simplest:
http://bl.ocks.org/950642
You haven’t posted a link to your code, but I'm guessing that node refers to a selection of SVG circle elements. You can’t add text elements to circle elements because circle elements are not containers; adding a text element to a circle will be ignored.
Typically you use a G element to group a circle element (or an image element, as above) and a text element for each node. The resulting structure looks like this:
<g class="node" transform="translate(130,492)">
<circle r="4.5"/>
<text dx="12" dy=".35em">Gavroche</text>
</g>
Use a data-join to create the G elements for each node, and then use selection.append to add a circle and a text element for each. Something like this:
var node = svg.selectAll(".node")
.data(nodes)
.enter().append("g")
.attr("class", "node")
.call(force.drag);
node.append("circle")
.attr("r", 4.5);
node.append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name });
One downside of this approach is that you may want the labels to be drawn on top of the circles. Since SVG does not yet support z-index, elements are drawn in document order; so, the above approach causes a label to be drawn above its circle, but it may be drawn under other circles. You can fix this by using two data-joins and creating separate groups for circles and labels, like so:
<g class="nodes">
<circle transform="translate(130,492)" r="4.5"/>
<circle transform="translate(110,249)" r="4.5"/>
…
</g>
<g class="labels">
<text transform="translate(130,492)" dx="12" dy=".35em">Gavroche</text>
<text transform="translate(110,249)" dx="12" dy=".35em">Valjean</text>
…
</g>
And the corresponding JavaScript:
var circle = svg.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(nodes)
.enter().append("circle")
.attr("r", 4.5)
.call(force.drag);
var text = svg.append("g")
.attr("class", "labels")
.selectAll("text")
.data(nodes)
.enter().append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name });
This technique is used in the Mobile Patent Suits example (with an additional text element used to create a white shadow).
I found this guide very useful in trying to accomplish something similar :
https://www.dashingd3js.com/svg-text-element
Based on above link this code will generate circle labels :
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</head>
<body style="overflow: hidden;">
<div id="canvas" style="overflow: hidden;"></div>
<script type="text/javascript">
var graph = {
"nodes": [
{name: "1", "group": 1, x: 100, y: 90, r: 10 , connected : "2"},
{name: "2", "group": 1, x: 200, y: 50, r: 15, connected : "1"},
{name: "3", "group": 2, x: 200, y: 130, r: 25, connected : "1"}
]
}
$( document ).ready(function() {
var width = 2000;
var height = 2000;
var svg = d3.select("#canvas").append("svg")
.attr("width", width)
.attr("height", height)
.append("g");
var lines = svg.attr("class", "line")
.selectAll("line").data(graph.nodes)
.enter().append("line")
.style("stroke", "gray") // <<<<< Add a color
.attr("x1", function (d, i) {
return d.x
})
.attr("y1", function (d) {
return d.y
})
.attr("x2", function (d) {
return findAttribute(d.connected).x
})
.attr("y2", function (d) {
return findAttribute(d.connected).y
})
var circles = svg.selectAll("circle")
.data(graph.nodes)
.enter().append("circle")
.style("stroke", "gray")
.style("fill", "white")
.attr("r", function (d, i) {
return d.r
})
.attr("cx", function (d, i) {
return d.x
})
.attr("cy", function (d, i) {
return d.y
});
var text = svg.selectAll("text")
.data(graph.nodes)
.enter()
.append("text");
var textLabels = text
.attr("x", function(d) { return d.x; })
.attr("y", function(d) { return d.y; })
.text( function (d) { return d.name })
.attr("font-family", "sans-serif")
.attr("font-size", "10px")
.attr("fill", "red");
});
function findAttribute(name) {
for (var i = 0, len = graph.nodes.length; i < len; i++) {
if (graph.nodes[i].name === name)
return graph.nodes[i]; // Return as soon as the object is found
}
return null; // The object was not found
}
</script>
</body>
</html>
If you want to grow the nodes to fit large labels, you can use the getBBox property of an SVG text node after you've drawn it. Here's how I did it, for a list of nodes with fixed coordinates, and two possible shapes:
nodes.forEach(function(v) {
var nd;
var cx = v.coord[0];
var cy = v.coord[1];
switch (v.shape) {
case "circle":
nd = svg.append("circle");
break;
case "rectangle":
nd = svg.append("rect");
break;
}
var w = 10;
var h = 10;
if (v.label != "") {
var lText = svg.append("text");
lText.attr("x", cx)
.attr("y", cy + 5)
.attr("class", "labelText")
.text(v.label);
var bbox = lText.node().getBBox();
w = Math.max(w,bbox.width);
h = Math.max(h,bbox.height);
}
var pad = 4;
switch (v.shape) {
case "circle":
nd.attr("cx", cx)
.attr("cy", cy)
.attr("r", Math.sqrt(w*w + h*h)/2 + pad);
break;
case "rectangle":
nd.attr("x", cx - w/2 - pad)
.attr("y", cy - h/2 - pad)
.attr("width", w + 2*pad)
.attr("height", h + 2*pad);
break;
}
});
Note that the shape is added, the text is added, then the shape is positioned, in order to get the text to show on top.
I want to display the legend (caption?) of some data.
For each part of the legend, I append a rect and a p to a parent division.
The problem is that rect are not showing up.
Here is my code:
var groups = {{ groups|safe }};
groups.forEach(function(group, i) {
var div = d3.select("#collapse-legend");
div.append("rect")
.attr("width", 17)
.attr("height", 17)
.style("fill-opacity", 1)
.style("fill", function (d) { return c(i); });
div.append("p").text(group)
});
Now, when I check the content of my web page, I get both rect and p, but rect:
is not showing up
seems to have a width of 0 (showing its area with firefox)
Is there some mistake in my code? Are there better ways to achieve this? I am very new to javascript and d3.js so please be indulgent ^^
Update
So this is what I ended with.
HTML:
<div ...>
<svg id="legend-svg"></svg>
</div>
JavaScript:
// set height of svg
d3.select("#legend-svg").attr("height", 18*(groups.length+1));
// for each group, append rect then text
groups.forEach(function(group, i) {
d3.select("#legend-svg").append("rect")
.attr("y", i*20)
.attr("width", 18)
.attr("height", 18)
.style("fill-opacity", 1)
.style("fill", function (d) { return c(i); });
d3.select("#legend-svg").append("text")
.attr("x", 25)
.attr("y", i*20+15)
.text(group);
});
SVG elements like <rect> cannot be direct children of html <div> elements. You must put them inside an <svg> container element.
SET X + Y values for rect :
.attr("x", 50)
.attr("y", 50)