I would like to hide a pie chart slice on load but cannot figure out how to do so.
I'm not sure it's possible, but it seems like it might be. There is a property "selected", but it does not seem to change when I manually select or unselect a wedge via the legend. I've tried to dispatchAction like this example (example), but haven't had any luck:
I think you are close to the solution... Actually, you should tweak legend.selected.
Take a look at this basic example:
let option = {
legend: {
selected: {
'B': false // <--- HERE
}
},
series: [
{
type: 'pie',
label: {
position: 'inner'
},
data: [
{ value: 10, name: 'A' },
{ value: 20, name: 'B' },
{ value: 15, name: 'C' }
]
}
]
};
let myChart = echarts.init(document.getElementById('main'));
myChart.setOption(option);
#main {
width: 300px;
height: 300px;
}
<script src="https://cdn.jsdelivr.net/npm/echarts#5.4.1/dist/echarts.min.js"></script>
<div id="main"></div>
I am working on a project where I am implementing some charts from the Vue-Chartjs library. I need the Y-axis max value to change everytime the user changes the filters given. I Import an existing barchart from the vue-chartjs library. In the code there is a javascript file that has some defaults already, to set extra options I can use the extraOptions object as a prop to personalize each chart accordingly. Here is the default component:
import { Bar } from 'vue-chartjs'
import { hexToRGB } from "./utils";
import reactiveChartMixin from "./mixins/reactiveChart";
let defaultOptions = {
tooltips: {
tooltipFillColor: "rgba(0,0,0,0.5)",
tooltipFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
tooltipFontSize: 14,
tooltipFontStyle: "normal",
tooltipFontColor: "#fff",
tooltipTitleFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
tooltipTitleFontSize: 14,
tooltipTitleFontStyle: "bold",
tooltipTitleFontColor: "#fff",
tooltipYPadding: 6,
tooltipXPadding: 6,
tooltipCaretSize: 8,
tooltipCornerRadius: 6,
tooltipXOffset: 10,
},
legend: {
display: false
},
scales: {
yAxes: [{
ticks: {
fontColor: "#9f9f9f",
fontStyle: "bold",
beginAtZero: true,
display: false,
min: 0,
max: 100
},
gridLines: {
display: false,
drawBorder: false,
}
}],
xAxes: [{
gridLines: {
display: false,
drawBorder: false,
},
}],
}
};
export default {
name: 'BarChart',
extends: Bar,
mixins: [reactiveChartMixin],
props: {
labels: {
type: [Object, Array],
description: 'Chart labels. This is overridden when `data` is provided'
},
datasets: {
type: [Object, Array],
description: 'Chart datasets. This is overridden when `data` is provided'
},
data: {
type: [Object, Array],
description: 'Chart.js chart data (overrides all default data)'
},
color: {
type: String,
description: 'Chart color. This is overridden when `data` is provided'
},
extraOptions: {
type: Object,
description: 'Chart.js options'
},
title: {
type: String,
description: 'Chart title'
},
},
methods: {
assignChartData() {
let { gradientFill } = this.assignChartOptions(defaultOptions);
let color = this.color || this.fallBackColor;
return {
labels: this.labels || [],
datasets: this.datasets ? this.datasets : [{
label: this.title || '',
backgroundColor: gradientFill,
borderColor: color,
pointBorderColor: "#FFF",
pointBackgroundColor: color,
pointBorderWidth: 2,
pointHoverRadius: 4,
pointHoverBorderWidth: 1,
pointRadius: 4,
fill: true,
borderWidth: 1,
data: this.data || []
}]
}
},
assignChartOptions(initialConfig) {
let color = this.color || this.fallBackColor;
const ctx = document.getElementById(this.chartId).getContext('2d');
const gradientFill = ctx.createLinearGradient(0, 170, 0, 50);
gradientFill.addColorStop(0, "rgba(128, 182, 244, 0)");
gradientFill.addColorStop(1, hexToRGB(color, 0.6));
let extraOptions = this.extraOptions || {}
return {
...initialConfig,
...extraOptions,
gradientFill
};
}
},
mounted() {
this.chartData = this.assignChartData({});
this.options = this.assignChartOptions(defaultOptions);
this.renderChart(this.chartData, this.options, this.extraOptions);
}
}
I use this js file to import the bar chart inside a vue component like you see down below.
everytime the input of the form changes i need to re render the chart. I use the onInputChange() method to turn the boolean loaded to false and call the loadData() method.
Inside the loadData() method I make an axios request that gets me the right data every time. I also get the maximum value for my Y axis.
Then in the response I call on updateChart() so that I can update the data and the max value of the chart. then i turn the boolean loaded to true again so that my chart renders accordingly.
The problem with this approach is that the chart disappears completely for a split of a second. Before deciding to change the max Value of the Y axis I was able to update the data of my chart without having to use the v-if="loaded".
I need to find a solution where the chart re renders without it completely disappearing from the page. I know some suggested to use computed variables but i don't fully understand how it is supposed to work. Here is the component minus the form fields.
I guess in it's essence what I want is to update the Y axis max value without having to re render the entire chart.
<template>
<div>
<BarChart v-if="loaded" :labels="chartLabels"
:datasets="datasets"
:height="100"
:extraOptions="extraOptions"
>
</BarChart>
<br>
</div>
</template>
<script>
import BarChart from '../../components/Library/UIComponents/Charts/BarChart'
import Dropdown from "../../components/Library/UIComponents/Dropdown"
import GroupedMultiSelectWidget from "~/components/widgets/GroupedMultiSelectWidget"
import SelectWidget from "../../components/widgets/SelectWidget";
export default{
name: 'PopularChart',
components: {BarChart, Dropdown, SelectWidget, GroupedMultiSelectWidget},
data(){
return {
loaded:true,
form:{
day: 'Today',
workspace:'',
machine_family: [],
duration: [],
user_group: [],
dt_start:'',
dt_end:''
},
url: `/api/data_app/job_count_by_hour/`,
chart_data: [],
days: [ {day:"Today", id:"Today"},
{day:"Monday", id:"0"},
{day:"Tuesday",id:"1"},
{day:"Wednesday",id:"2"},
{day:"Thursday",id:"3"},
{day:"Friday",id:"4"},
{day:"Saturday",id:"5"},
{day:"sunday",id:"6"} ],
chartLabels: ["00u", "1u", "2u", "3u","4u","5u", "6u", "7u", "8u", "9u", "10u", "11u", "12u", "13u", "14u", "15u","16u", "17", "18u","19u","20u","21u","22u","23u"],
datasets: [],
maximumValue: '',
extraOptions:{}
}
},
methods: {
onInputChange() {
this.loaded = false
this.loadData()
},
async loadData() {
await this.$axios.get(`${this.url}?day=${this.form.day}&date_start=${this.form.dt_start}&date_end=${this.form.dt_end}&workspace=${this.form.workspace}&user_group=${this.form.user_group}&machine_family=${this.form.machine_family}`)
.then(response => {
this.updateChart(response.data.results,response.data.maximum)
this.loaded = true
})
},
updateChart(data,maxValue) {
this.datasets = [{
label: ["jobs %"],
backgroundColor:"#f93232",
data: data
},]
this.maximumValue = maxValue
this.extraOptions = {
tooltips: {
callbacks:{
label: function (tooltipItems,){
if (tooltipItems.value > ((50/100) * maxValue)){
return 'busy';
}else if (tooltipItems.value < ((30/ 100) * maxValue) ){
return ' not busy';
}else if ( tooltipItems.value < ((40/ 100) * maxValue )){
return 'kind of busy'
}
}
}
},
scales: {
yAxes: [{
gridLines: {
zeroLineColor: "transparent",
display: false,
drawBorder: false,
},
ticks: {
max: this.maximumValue,
display: true,
}
}],
xAxes: [{
gridLines: {
zeroLineColor: "transparent",
display: false,
drawBorder: false,
},
}],
},
}
},
},
mounted() {
this.loadData()
},
}
</script>
You can bind the chart to a variable in data(), initialize it with some defaults in mounted() and whenever you want to update the chart data, you use the Chart.js API.
An implementation could look something like this:
export default {
data() {
return {
chart: null
};
},
mounted() {
this.chart = new Chart(/* defaults */);
},
methods: {
updateChart(data) {
this.chart.data.datasets = data;
/* rest of the chart updating */
this.chart.update();
}
}
};
I have a dynamic chart that allows the user to switch between pie, bar and line charts (in the full deployment the user can switch Ajax data as well).
The export to PDf is causing me some issues. I can adjust the font size and style on the pie chart using:
exporting: {
enabled: false,
sourceWidth: 842,
sourceHeight: 595,
chartOptions: {
plotOptions: {
series: {
dataLabels: {
style: {
fontSize: '7px',
lineHeight: '7px'
}
}
}
}
}
}
However, when I export a bar chart, the xAxis font size is still to large.
I tried:
exporting: {
enabled: false,
sourceWidth: 842,
sourceHeight: 595,
chartOptions: {
plotOptions: {
series: {
dataLabels: {
style: {
fontSize: '7px',
lineHeight: '7px'
}
}
}
},
xAxis: [{
labels: {
style: {
fontSize: '7px'
}
}
}]
}
}
Which altered the font size beautifully, unfortunately it removed all my custom xAxis labels and replaced them with numbers.
I have a fiddle https://jsfiddle.net/spencerplanton/dr0au6kg/5/
Which allows you to see the issue.
I apologise in advance for the slightly verbose nature of the example, but it has been lifted from several sources and a much larger dynamic chart application.
Any help formatting the PDF export bar chart axis font size would be greatly appreciated.
Kind regards
The options for arrays are overwritten. You need to set:
exporting: {
...,
chartOptions: {
...,
xAxis: [{
type: 'category',
labels: {
style: {
fontSize: '7px'
}
}
}]
},
}
Live demo: https://jsfiddle.net/BlackLabel/ryn5p20q/
API Reference: https://api.highcharts.com/highcharts/exporting.chartOptions
I genere a donut chart using chartjs and clivuejs.
My problem is depending on the chart the external label can be truncate or not.
Using "inspect" chrome mode I tried to amend the width/height of the canvas and of different parent div without.
//../src/DoughnutChart.js
import {
Doughnut,mixins
} from 'vue-chartjs'
export default {
extends: Doughnut,
mixins: [mixins.reactiveProp],
props: ['chartData'],
data() {
return {
options: {
tooltips: {
enabled: true
},
pieceLabel: {
render: 'label',
arc: true,
fontColor: '#000',
position: 'inside'
},
responsive: true,
legend: {
display: false,
position: 'top',
},
scaleLabel : {
display: true
},
maintainAspectRatio: false
}
}
},
mounted() {
this.renderChart(this.chartdata, this.options)
}
}
As you can see on attached file, external labels are not visible at all or truncate.
EDIT:
Using padding advise provided by Daniel (thanks Daniel)I have now the following. Event if the chart is very small I still have the issue. Is there any way to force the label to have a smarter position based on parent canvas ?
I have a Rally SDK 2.0p5 app that displays a chart. When the user selects an option, the data will be updated and I would like to refresh the chart. But instead of redrawing, it will place a new chart beneath. What is the proper syntax?
// Configure and Add the chart
this.add(
{
xtype: 'rallychart',
height: 400,
id: 'chart',
chartConfig: {
chart: {
},
title: {
text: 'My Chart',
align: 'center'
},
xAxis: [
{
categories: ['M0','M1','M2','M3','M4','M5'],
title: {
text: 'Interval'
}
}
],
yAxis: {
title: {
text: yText
}
},
series: [ { type: 'column',
name: yText,
data: mCount } ],
plotOptions : {
column: {
color: '#F00'
},
series : {
animation : {
duration : 2000,
easing : 'swing'
}
}
}
}
}
);
You need to remove the 1st chart before adding the new one.
redrawChart: function() {
this.remove('#chart');
this.add({...});
}
It's often better to just update the chart in place. HighCharts is the charting library that's included in the App SDK. HighCharts will even animate your changes. Cool!!! Look here for the list of methods that operate on charts. You can add series, change data, change axis limits, control the zoom, etc.