I had implemented the HighCharts in the framework in my company, and I can say that we are super satisfied with it. But we have a problem, we don't know how to solve.
In column graphs, when a column has its value equal to zero, it is no visual information about it, the column is just omitted. I want it displayed in a tooltip when the user mouses over the space of the column where the value is equal to 0.
Watch the fiddle below where it generates a bar chart with several columns with value 0, or worthless.
JsFiddle
The method where the chart runs:
GraficoBarra(arrayPropriedades, arrayDados, arrayDrillDown);
Why not make it a shared tooltip like this:
tooltip: {
formatter: function() {
var s = '<b>'+ this.x +'</b>';
$.each(this.points, function(i, point) {
s += '<br/>'+ point.series.name +': '+
point.y +'m';
});
return s;
},
shared: true
},
Demo here. Note that I have added a 0 point value. If there is no point there then there is nothing to show, right?
{
name: "2012",
data: [
[0, 69347.35],
[1, 120753.55],
[2, 0],
[12, 95050.45]
]
}
As #wergeld said, you need to pass 0-based values to options, otherwise you won't get displayed nothing at all. For nulls it's no possible, since this doesn't have value.
Now,you need to set minPointLength, to some value (like 10), then even 0-values will be displayed as small bars. See demo: http://jsfiddle.net/EJK4e/12/
Just to be on the same page - to display tooltip, you need point graphic, otherwise there will be no hover event for triggering tooltip to show up.
Related
I'm using Chart.js v1.0.1-beta.3. I'm creating an interactive bar chart where users can click on a bar to increase the value of that bar.
By default, the histogram begins with empty values. The y-axis in that case defaults to a [0,1] scale. When users start adding data to the histogram, the y-axis maximum changes to adjust, which causes a jarring shift in the appearance of the graph at low values.
I'd like to have the y-axis default to, say, a [0,10] scale even when no data is entered. This StackOverflow question is the most relevant info I can find on how to address problems like this; the best solution on that page is to use the 'suggestedMax' parameter in the chart options:
scales: {
yAxes: [{
ticks: {
suggestedMax : 10
}
}]
},
although this might apply only to v2+ of the library, it's hard to tell. In any event, this doesn't work, and the y-axis defaults to [1,0] when there's no data. I've also tried every combination of every other suggestion on that page, including
using scaleOverride : true, display : true, setting explicit min and max parameters within 'ticks', scaleBeginsAtZero : true, beginAtZero : true, and scaleStartValue : 0,
If I try to upgrade to the most current release, v2.7.3, the charts don't appear on the rendered page at all. I don't have the time or inclination to debug what's happening there, so I'm stuck with v1.0.1.
How do I have a bar chart default to a suggested maximum in this version? Is it even possible?
Looking through the documentation included with v1.0.1 (zip file), there doesn't appear to be a way to do this. I can't see any option to set the scale values.
In v2.7.3 this is quite simple. A working example is below. The chart starts empty, with a y-axis scale from 0-10. Clicking 'Add Series' adds a new bar with a value of 5. Clicking a bar increments value by 1.
let btn1 = document.getElementById('add'),
canvas = document.getElementById('chart'),
chart = new Chart(canvas, {
type: 'bar',
data: {
labels: [],
datasets: []
},
options: {
scales: {
yAxes: [{
ticks: {
min: 0,
suggestedMax: 10
}
}]
}
}
});
canvas.addEventListener('click', function(e) {
let idx = chart.getDatasetAtEvent(e)[0]._datasetIndex;
chart.config.data.datasets[idx].data[0]++;
chart.update();
});
btn1.addEventListener('click', function() {
chart.config.data.datasets.push({
data: [5]
});
chart.update();
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
<button id="add">Add Series</button> Click a bar to increment its value by 1.
<canvas id="chart"></canvas>
Is it possible to position the Kendo Pie Chart labels depending on whether there is enough room for them to fit inside the Pie Chart, just like the best fit option in Excel? So if they can fit they go inside and if they can't an arrow will point to them from the outside. Possibly similar to this: Kendo barchart category labels left and right based on value
I don't mind doing it manually if I have to because I don't think Kendo has the feature built in.
I just worked it out, it turns out kendo passes the current data item as a parameter to the position property if you set it to a function, so all I had to do was check it's percentage and if its less than 30% (or whatever you want) then it will be in the inside otherwise it will be on the outside. The same can be done with color.
$("#chart").kendoChart({
series: [ {
labels: {
visible: true,
align: "circle",
position: function(e) {
if(e.percentage < 0.1)
return "outsideEnd";
else
return "insideEnd";
},
color: function(e) {
if(e.percentage < 0.1)
return "#000";
else
return "#fff";
}
},
type: "pie",
data: [2,1,3,4,2, 5]
}]
});
http://dojo.telerik.com/ewIva/3
Is it possible to combine the following?
Fiddle 1 (answered by mäksä) as a main template:
Single horizontal stacked bar with bar segments
Combined with the following features of Fiddle 2 (answered by aus_lacy):
Always visible on bar segments:
Data names (labels) (i.c. "apples", "pears",...)
Percentages (calculated if possible: "50%","50%",...)
Shown on mousehover:
Original data numbers (i.c. "15","15",...)
Series name/description (i.c. "Browser share")
Almost but not quite:
An example of a horizontal bar chart with "percentages" always shown, and "original data numbers" on mousehover can be found in Fiddle 3 (answered by jlbriggs), but there the "data names" are lacking, and I can't find a way to change the "series name". Further more: this is a horizontal bar chart, but this is not a single stacked one.
Any help would greatly be appreciated, many thanks.
Again it's a simple modification of the Highcharts attributes in particular this small snippet:
bar: {
dataLabels: {
enabled: true,
distance : -50,
formatter: function() {
var dlabel = this.series.name + '<br/>';
dlabel += Math.round(this.percentage*100)/100 + ' %';
return dlabel
},
style: {
color: 'white',
},
},
},
I think this snippet is what you are after?
I was having a hard time trying to figure out how to center labels on a datetime x-axis in Highcharts without using categories and tickPlacement (since tickPlacement only works on categories).
My axis was dynamically created so I could not simply set an x-offset or padding, as this would cause axes of different intervals to look strange.
After messing around with the config options I think I may have found a solution using the x-axis formatter and some css / jquery noodling in the Highcharts callback. See my answer below.
The trick is to use the x-axis labels object like this:
xAxis: {
type: 'datetime',
labels: {
useHTML: true,
align: 'center',
formatter: function () {
//using a specific class for the labels helps to ensure no other labels are moved
return '<span class="timeline_label">' + Highcharts.dateFormat(this.dateTimeLabelFormat, this.value) + '</span>';
}
}
You can see that the formatter will keep whatever dateTimeLabelFormat has been set by the user or default.
Then have a callback that does something like this:
function (chart) {
var $container = $(chart.container);
var $labels = $container.find('.highcharts-axis-labels .timeline_label');
var $thisLabel, $nextLabel, thisXPos, nextXPos, delta, newXPos;
$labels.each(function () {
$thisLabel = $(this).parent('span');
thisXPos = parseInt($thisLabel.css('left'));
$nextLabel = $thisLabel.next();
nextXPos = $nextLabel.length ? parseInt($nextLabel.css('left')) : chart.axes[0].left + chart.axes[0].width;
delta = (nextXPos - thisXPos) / 2.0;
newXPos = thisXPos + delta;
if ($nextLabel.length || $(this).width() + newXPos < nextXPos) {
$thisLabel.css('left', newXPos + 'px');
} else {
$thisLabel.remove();
}
});
});
In short, this will go through each label and determine how much it should be moved over (using css) by calculating the distance between itself and the next label. When it reaches the the last label, it either moves it over using the end of the axis for the calculation or removes it if it won't fit. This last part is just the decision I decided to make, you can probably choose to do something else like word wrap, etc.
You can see the jsfiddle here
Hope this helps some people. Also, if there are any improvements it would be great to see them here.
Based on the existing answer, there is a much simpler solution that also works when resizing the browser window (or otherwise forcing the chart to redraw), even when the tick count changes: http://jsfiddle.net/McNetic/eyyom2qg/3/
It works by attaching the same event handler to both the load and the redraw events:
$('#container').highcharts({
chart: {
events: {
load: fixLabels,
redraw: fixLabels
}
},
[...]
The handler itself looks like this:
var fixLabels = function() {
var labels = $('div.highcharts-xaxis-labels span', this.container).sort(function(a, b) {
return +parseInt($(a).css('left')) - +parseInt($(b).css('left'));
});
labels.css('margin-left',
(parseInt($(labels.get(1)).css('left')) - parseInt($(labels.get(0)).css('left'))) / 2
);
$(labels.get(this.xAxis[0].tickPositions.length - 1)).remove();
};
As you see, the extra wrapping of labels is unnecessary (at least if you do not have more than one xAxis). Basically, it works like this:
Get all existing labels (when redrawn, this includes newly added ones). 2. Sort by css property 'left' (they are not sorted this way after some redrawing)
Calculate offset between the first two labels (the offset is the same for all labels)
Set half of the offset as margin-left of all labels, effectively shifting them half the offset to the right.
Remove the rightmost label (moved outside of chart, by sometimes partly visible).
I'm using the jquery plugin jqplot for plotting some bar charts.
on hover, I'd like to display the tick for the bar and its value on a tooltip. I've tried
highlighter: { show: true,
showTooltip: true, // show a tooltip with data point values.
tooltipLocation: 'nw', // location of tooltip: n, ne, e, se, s, sw, w, nw.
tooltipAxes: 'both', // which axis values to display in the tooltip, x, y or both.
lineWidthAdjust: 2.5 // pixels to add to the size line stroking the data point marker
}
but it doesn't work. the bar visually gets lighter, and there's a small dot on the top (which would ideally go away--probably from line chart renderer stuff), but there is no tooltip anywhere. Anyone know how I can do this? I'll have lots of bars so the x-axis will be cluttered and kind of a mess if I show them down there only.
I go through jqplot.highlighter.js and find an undocumented property: tooltipContentEditor.
I use it to customize the tooltip to display x-axis label.
Use something like this:
highlighter:{
show:true,
tooltipContentEditor:tooltipContentEditor
},
function tooltipContentEditor(str, seriesIndex, pointIndex, plot) {
// display series_label, x-axis_tick, y-axis value
return plot.series[seriesIndex]["label"] + ", " + plot.data[seriesIndex][pointIndex];
}
nevermind, I did a roundabout way to create my own tooltip via jquery.
I left my highlighter settings as they were in my question (though you probably don't need the tooltip stuff).
In my js file after the bar chart is set up (after $.jqplot('chart', ...) I set up an on mouse hover binding, as some of the examples showed. I modified it like this:
$('#mychartdiv').bind('jqplotDataHighlight',
function (ev, seriesIndex, pointIndex, data ) {
var mouseX = ev.pageX; //these are going to be how jquery knows where to put the div that will be our tooltip
var mouseY = ev.pageY;
$('#chartpseudotooltip').html(ticks_array[pointIndex] + ', ' + data[1]);
var cssObj = {
'position' : 'absolute',
'font-weight' : 'bold',
'left' : mouseX + 'px', //usually needs more offset here
'top' : mouseY + 'px'
};
$('#chartpseudotooltip').css(cssObj);
}
);
$('#chartv').bind('jqplotDataUnhighlight',
function (ev) {
$('#chartpseudotooltip').html('');
}
);
explanation:
ticks_array is previously defined, containing the x axis tick strings. jqplot's data has the current data under your mouse as an [x-category-#, y-value] type array. pointIndex has the current highlighted bar #. Basically we will use this to get the tick string.
Then I styled the tooltip so that it appears close to where the mouse cursor is. You will probably need to subtract from mouseX and mouseY a bit if this div is in other positioned containers.
you can then style #chartpseudotooltip in your css. If you want the default styles you can just add it to .jqplot-highlighter-tooltip in the the jqplot.css.
hope this is helpful to others!
I am using the version of the highlighter plugin on the following link:
https://github.com/tryolabs/jqplot-highlighter
The parameters I am using:
highlighter: {
show:true,
tooltipLocation: 'n',
tooltipAxes: 'pieref', // exclusive to this version
tooltipAxisX: 20, // exclusive to this version
tooltipAxisY: 20, // exclusive to this version
useAxesFormatters: false,
formatString:'%s, %P',
}
The new parameters ensure a fixed location where the tooltip will appear. I prefer to place it on the upper left corner to avoid problems with resizing the container div.