I got an issue with showing hover tooltips with ECharts line graph when all input values of the graph are null.
The use case is a graph that might have some null/undefined values at certain points in time. For normal values, the graph would show the tooltip as usual. Whenever the value of the graph is null or undefined, I want the graph still show the hover tooltip but with custom format, for instance, 'N/A'.
The example code snippet is a simple EChart configuration that I took from EChart line graph examples and change the input data to null.
const container = document.getElementById("main");
const chart = echarts.init(container);
const options = {
tooltip: {
trigger: "axis",
axisPointer: {
type: "shadow",
label: {
show: true,
overflow: "break"
}
}
},
xAxis: {
type: "category",
data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
},
yAxis: [
{
type: "value",
},
],
series: [
{
type: "line",
data: [null, null, null, null, null, null, null],
}
]
};
chart.setOption(options, true);
#main {
width: 600px;
height: 200px;
}
<html>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/echarts/5.2.0/echarts.min.js"></script>
<div id="main"></div>
</body>
</html>
Unfortunately, ECharts does not show any tooltip when all input values are null (or undefined). It will show only when at least one of the input is not null nor undefined.
How can I force ECharts to show the tooltip regardless so that I can show the custom format hover?
MWE with all null values: https://codepen.io/htr3n/pen/bGRvyJJ
MWE with at least one non-null value: https://codepen.io/htr3n/pen/JjJLQYr
This is actually a bug in ECharts 5.2 and previous versions. I opened a ticket with the ECharts team and they will fix and release the fix in v5.3.0.
Relevant bug ticket:
https://github.com/apache/echarts/issues/15821
Related
I am trying to draw a chart by passing values for labels and data dynamically using char.js.
The chart.js module refuses to accept the labels when passed as a variable.
When I hardcode it, it works just fine.
The label variable prints out the values on the page and seems to be correct in format.
Very similar to the problem described in the below query, except that I am already using a proper array.
[https://stackoverflow.com/questions/60453491/chart-js-not-showing-data-when-pass-dynamic-labels][1]
mypage.html:
<script src="https://cdn.jsdelivr.net/npm/chart.js#2.9.4"></script>
{{Messages.vm_size_in_use_labels}}
{{Messages.vm_size_in_use_data}}
<canvas id="chart" width="50" height="50"></canvas>
<script lang="JavaScript">
let ctx = document.getElementById("chart").getContext("2d");
let chart = new Chart(ctx, {
type: "pie",
data: {
labels: {{Messages.vm_size_in_use_labels}},
datasets: [
{
label: "Gross volume ($)",
backgroundColor: "#79AEC8",
borderColor: "#417690",
data: {{Messages.vm_size_in_use_data}},
}
]
},
options: {
title: {
text: "Gross Volume in 2020",
display: true
}
}
});
</script>
The page shows the printed value correctly but chart doesn't display:
['Standard_B1ls', 'Standard_D2_v2', 'Standard_D4s_v3', 'Standard_B1s']
[3, 3, 1, 1]
If I change the label to hard values,
labels: ['Standard_B1ls', 'Standard_D2_v2', 'Standard_D4s_v3', 'Standard_B1s'],
this works just fine and chart is displayed.
Not sure what is missing here. the framework is django if it matters.
I'm using CanvasJs for the first time for my charts but I noticed that everytime a value is zero the graph doesn't display this. I'm using a chart which combines a line chart and a bar chart so this is important to show if there has been zero change between the two values. The piece of code for the line graph is as follows:
{
type: "line",
name: "Cumulatief",
showInLegend: true,
yValueFormatString: "€#",
dataPoints: [
{ x: new Date(dateValue1) , y: 0 }
]
}
I hope that someone can help me so that I can display the value zero on the line chart.
Y-value 0 is being rendered irrespective of chart-type is line or column and seems to be working fine.
However value 0 is not being displayed in toolTip as you are setting yValueFormatString to '€#'. Changing it to '€0' will work fine in this case. Check the working code below:
var chart = new CanvasJS.Chart("chartContainer", {
data: [{
type: "line",
name: "Cumulatief",
showInLegend: true,
yValueFormatString: "€0",
dataPoints: [
{ x: new Date(2018,03,19) , y: 0 }
]
}]
});
chart.render();
<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<div id="chartContainer" style="height: 260px; width: 100%;"></div>
I've been trying to get graphing working, all the data seems to be graphing, however the tooltip doesn't move from the far right. This of course is a issue since I cannot then mouse over specific points to see the data.
Here is a JS fiddle example of what's happening: https://jsfiddle.net/kp7eyf8o/6/
NOTE: for some reason the stack overflow JSfiddle gives me an error, but the URL should show my issue.
var chart = c3.generate({
bindto: '#test',
data: {
x: 'x',
columns: [
['x', '2016-01-01', '2016-02-02', '2016-03-03', '2016-04-04', '2016-05-05', '2016-06-06', '2016-07-07', '2016-08-08', '2016-09-09', '2016-10-10', '2016-11-11', '2016-12-12'],
['2016 Actual', 12873666.64, 15976835.94, 19232540.28, 23649495.4, 26338636.36, 29496799.84, 43801703.66, 4263924.64, 5788580.3, ],
['2016 Projected', 3916752.11, 4626643.23, 5146264.25, 6148854.32, 6640724.57, 7409783.48, 8263054.46, 8488001.54, 8837809.1, 9068047.68, 9402019.15, 9513505.72, ],
['2015 Actual', 3256870.0, 3825580.0, 4394290.0, 5550000.0, 6044000.0, 7100000.0, 7700000.0, 8154000.0, 8860000.0, 9200000.0, 9500000.0, 9600328.45, ]
],
colors: {
'2016 Actual': '#2cd554',
'2016 Projected': '#1bc4fc',
'2015 Actual': '#fdaf5a'
}
},
axis: {
x: {
type: 'timeseries',
tick: {
culling: false,
format: '%b'
}
},
y: {
tick: {
format: d3.format("$,.2f")
}
}
},
});
<link href="https://rawgit.com/masayuki0812/c3/master/c3.css" rel="stylesheet" />
<script src="https://rawgit.com/masayuki0812/c3/master/c3.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.3.12/d3.min.js"></script>
<div id="test"></div>
I saw someone mention using 'xs: {x .... y....} but I wasn't able to get that working. I need the X axis to be dates (hard coded right now but in my app I'm using dates associated with one dataset I'm looping through), and the Y axis to be $.
C3 tooltips seem to break when data arrays of different lengths are entered into the columns. You can try putting null values into the shorter array so that the tooltip can move properly.
JS Fiddle: https://jsfiddle.net/stancheta/7zgny2yd/
['2016 Actual', 12873666.64, 15976835.94, 19232540.28, 23649495.4, 26338636.36, 29496799.84, 43801703.66, 4263924.64, 5788580.3, null, null, null],
I have a chart made with highcharts.js.
The graph works the way I wanted but then if I try to set the categories (programmatically or not) somehitng strange happen, the tick become smaller and move to the centre leaving a big space on the sides of the graph.
BEFORE:
AFTER:
$(function () {
$('#container').highcharts({
chart: {
renderTo: 'graph',
type: 'area',
},
xAxis: {
title: {
text: ''
},
startOnTick: false,
endOnTick: false,
tickmarkPlacement: 'on',
},
series: [{
data: [['aa',29.9], ['bb',71.5], ['cc',106.4],['dd', 129.2 ]]
}],
});
// the button handler
$('#button').click(function() {
var chart = $('#container').highcharts();
chart.xAxis[0].setCategories(['bb', 'bb', 'cc', 'dd']);
});
});
See this JsFiddle:
http://jsfiddle.net/MaurizioPiccini/d746v/3/
It all happens when you press the button (the categories can be set in the xAxis as well giving the same problem).
Is it possible to have named categories to start and end at the graph extremes?
You can use workaround which, updatse your axis with defined min/max value.
chart.xAxis[0].update({
categories: ['bb', 'bb', 'cc', 'dd'],
min: 0.5,
max: 2.5
});
http://jsfiddle.net/d746v/6/
I found a solution that is also reporteed here:
http://forum.highcharts.com/highcharts-usage/highchart-ticks-start-point-change-when-categories-names-are-t29052/
The solution is not to use categorized xAxis but linear or datetime with label formatter like this:
xAxis: {
labels: {
formatter: function(){
return categories[this.value];
}
}
}
where categories is an array of categories.
It looks like that is the only way to make the chart behave this way.
I am using Highcharts to plot JSON Data. The dates are in the string format.
JSON Data:
[{"BRENT_SPOT":70.88,"TRADE_DATE":"31-JUL-2009"},{"BRENT_SPOT":73.28,"TRADE_DATE":"03-AUG-2009"},{"BRENT_SPOT":74.31,"TRADE_DATE":"04-AUG-2009"},{"BRENT_SPOT":74.96,"TRADE_DATE":"05-AUG-2009"},{"BRENT_SPOT":74.4,"TRADE_DATE":"06-AUG-2009"},{"BRENT_SPOT":72.84,"TRADE_DATE":"07-AUG-2009"},{"BRENT_SPOT":73.29,"TRADE_DATE":"10-AUG-2009"},{"BRENT_SPOT":72.04,"TRADE_DATE":"11-AUG-2009"}]
HighCharts / JQuery Code :
<script>
var chart;
$(function() {
var options = {
chart: {
renderTo: 'container',
zoomType: 'xy',
type: 'line'
},
title: {
text: 'Brent Daily Price Curve (FPC as at <cfoutput>#f_date#</cfoutput>)'
},
xAxis: {
labels: {
rotation: 45,
step: 3
},
type: 'category'
},
yAxis: {
lineWidth: 1,
title: {
text: '$ USD'
},
min: 0
},
series: []
};
$.getJSON("brentpricehc_test.cfm?f_date=<cfoutput>#f_date#</cfoutput>", {}, function(jsonResult) {
var BrentUSDPrice = {
name: "Brent Spot (USD)",
type: "line",
data: [],
marker: {
radius: 2
}
};
$(jsonResult).each(function(index) {
BrentUSDPrice.data.push([this.TRADE_DATE, this.BRENT_SPOT]);
});
/*options.series[0] = BrentUSDPrice;*/
options.series.push(BrentUSDPrice);
chart = new Highcharts.Chart(options);
});
});
</script>
I'm unable to plot any values wrt each of the date strings. I tried converting the JSON dates to datetime instead but still the same issue.
Few More details (for testing purposes):
Modifying to the below line plots the graph with the correct "brent_spot" values. This means that the issue lies with the way the "trade_dates" are 'not' plotting.
BrentUSDPrice.data.push([index, this.BRENT_SPOT]);
Edit 2 : (Using Datetime type to make the code work)
JSON Data (New): Returned as TO_CHAR(TRADE_DATE, 'YYYY/MM/DD')
[{"BRENT_SPOT":70.88,"TRADE_DATE":"2009\/07\/31"},{"BRENT_SPOT":73.28,"TRADE_DATE":"2009\/08\/03"},{"BRENT_SPOT":74.31,"TRADE_DATE":"2009\/08\/04"},{"BRENT_SPOT":74.96,"TRADE_DATE":"2009\/08\/05"},{"BRENT_SPOT":74.4,"TRADE_DATE":"2009\/08\/06"},{"BRENT_SPOT":72.84,"TRADE_DATE":"2009\/08\/07"},{"BRENT_SPOT":73.29,"TRADE_DATE":"2009\/08\/10"},{"BRENT_SPOT":72.04,"TRADE_DATE":"2009\/08\/11"}]
$(jsonResult).each(function(index) {
BrentUSDPrice.data.push([new Date(this.TRADE_DATE), this.BRENT_SPOT]);
});
Server side language used : Coldfusion
Database : Oracle
Am I doing something silly somewhere?
I have just tried your code, and it works perfectly fine, see: http://jsfiddle.net/3bQne/1026/
I guess, you need to update to Highcharts 3.0.10 to get this working.
If you are using type: 'category' then you need to assign name: to the data points. See the categories entry at http://api.highcharts.com/highcharts#xAxis
If categories are present for the xAxis, names are used instead of numbers for that axis. Since Highcharts 3.0, categories can also be extracted by giving each point a name and setting axis type to "category".
So the question is whether you are using Highcharts 3.0 and if you do then it needs to look something like this:
data: [{
name: 'Point 1',
color: '#00FF00',
y: 0
}, {
name: 'Point 2',
color: '#FF00FF',
y: 5
}]
see: http://api.highcharts.com/highcharts#series.data