First let me clarify, i'm new to vue.
What I am trying to do is, when I get data from the defineProps. I want that the data from the defineProps goes to my script. Only I cant get the data over there. It is only available in the <template> {{ graph }} </template>. Notice that i can access the data with {{ graph }} in there. I just cant find a way to use it in export default { }
So my script is looking like this
<script setup>
const props = defineProps(['graph']);
</script>
<template>
{{ graph }} // Works
</template>
<script>
console.log(props); // Doesnt work or
console.log(graph); // Doesnt work
export default {
}
</script>
So, how do I get the data from props(graph) into export default { }?
Why do I want do this?
I saw https://vue-chartjs.org/examples/ and I followed it.
export default {
name: 'BarChart',
components: { Bar },
data() {
return {
chartData: {
labels: [ 'January', 'February', 'March' ],
datasets: [ { data: [3, 20, 12] } ]
},
chartOptions: {
responsive: true
}
}
}
}
Notice the data: [3, 20, 12]. I want to edit the values with the data I get. For example data: [props.day1, props.day2, props.day3]
Like commented, use just script setup, try like following:
<template>
<Bar :data="chartData" :options="chartOptions" />
</template>
<script setup>
import { Bar } from 'vue-chartjs'
import { Chart as ChartJS, Title, Tooltip, Legend, BarElement, CategoryScale, LinearScale } from 'chart.js'
import { ref } from 'vue'
ChartJS.register(Title, Tooltip, Legend, BarElement, CategoryScale, LinearScale)
const chartData = ref({
labels: [ 'January', 'February', 'March'],
datasets: [
{
label: 'Data One',
backgroundColor: '#f87979',
data: [40, 20, 12]
}
]
})
const chartOptions = ref({
responsive: true,
maintainAspectRatio: false
})
</script>
demo HERE
Related
I am using chartjs with the vue-chartjs wrapper and trying to create a Line Chart using data fetched from my api. The data prints to the console as expected and I do not get a error in the console. The resulting Line Chart does not display at all in the browser. There is, however a large amount of white space where the canvas tag is injected. I can create a doughnut chart fine, just not this line chart. Your help is greatly appreciated! I am using code from the Chart examples found at https://vue-chartjs.org/examples/ for the LineChart component
IndexView.vue
<script setup>
import axios from 'axios'
import { onMounted, reactive } from 'vue'
import LineChart from '#/components/LineChart.vue'
const data = reactive({
user: null,
totals: null,
checkins: null
})
const state = reactive({
loading: true
})
const charts = reactive({
doughnutConfig: null,
lineConfig: null
})
onMounted(async () => {
// load data from store and api
data.user = await userStore.fetchUser()
const user_resp = await axios.get(...)
data.totals = user_resp.data.totals
data.checkins = user_resp.data.check_ins
state.loading = false
// create line chart
var dates = []
var ratings = []
var length = data.checkins.length < 10 ? data.checkins.length : 10
for (var i = 0; i < length; i++) {
dates.push(data.checkins[i].date)
ratings.push(data.checkins[i].rating)
}
console.log(dates) // [ "2022-09-04T00:00:00", "2022-09-04T00:00:00", "2022-09-04T00:00:00", "2022-09-04T00:00:00", "2022-09-05T00:00:00" ]
console.log(ratings) // [ 5, 5, 3, 2, 4 ]
charts.lineConfig = {
data: {
labels: dates,
datasets: {
label: 'Ratings by date',
data: ratings,
backgroundColor: '#f87979'
}
},
options: {
responsive: true,
maintainAspectRatio: false,
plugins: {
legend: {
display: false
}
}
}
}
})
</script>
<template>
<LineChart
v-if="charts.lineConfig"
:chart-options="charts.lineConfig.options"
:chart-data="charts.lineConfig.data"
:width="400"
:height="300"
/>
</template>
LineChart.vue
<script setup>
import { defineProps } from 'vue'
import { Line } from 'vue-chartjs'
import {
Chart as ChartJS,
Title,
Tooltip,
Legend,
LineElement,
LinearScale,
PointElement,
CategoryScale
} from 'chart.js'
ChartJS.register(
Title,
Tooltip,
Legend,
LineElement,
LinearScale,
PointElement,
CategoryScale
)
const props = defineProps({
chartData: {
type: Object,
required: true
},
chartOptions: {
type: Object,
required: true
},
chartId: {
type: String,
default: 'line-chart'
},
width: {
type: Number,
required: true
},
height: {
type: Number,
required: true
}
})
</script>
<template>
<Line
:chart-id="props.chartId"
:chart-data="props.chartData"
:chart-options="props.chartOptions"
:width="props.width"
:height="props.height"
/>
</template>
Usually when a chart is not shown, there is an issue on the data configuration.
In your data config, the datasets option seems to be defined as an object but instead should be an array.
data: {
labels: dates,
datasets: { // <--- should be an array.
label: 'Ratings by date',
data: ratings,
backgroundColor: '#f87979'
}
},
It should be:
data: {
labels: dates,
datasets: [{
label: 'Ratings by date',
data: ratings,
backgroundColor: '#f87979'
}]
},
I am currently trying to add a gradient background with a slight transparency to a radar graph inside a react component. I have only been able to find solutions for this problem by referencing a chartjs canvas within an html file, but no solutions via a react component in a tsx/jsx file.
Desired Result I am looking for, and the
Current Result
The code below is used to achieve the current result.
import { Chart } from 'react-chartjs-2';
import { Chart as ChartJS, LineController, LineElement, PointElement, LinearScale, Title, Filler, RadialLinearScale } from 'chart.js';
ChartJS.register(LineController, RadialLinearScale, LineElement, PointElement, LinearScale, Filler, Title);
const labels = ['Thing 1', 'Thing 2', 'Thing 3', 'Thing 4', 'Thing 5', 'Thing 6'];
const chartData = [5, 3, 4, 5, 2, 4];
const data = {
labels: labels,
datasets: [
{
data: chartData,
fill: true,
backgroundColor: 'pink',
borderColor: 'transparent',
pointBorderColor: 'transparent',
pointBackgroundColor: 'transparent',
},
],
};
const options = {
scales: {
r: {
grid: {
lineWidth: 2,
},
angleLines: {
lineWidth: 2,
},
gridLines: {
display: false
},
ticks: {
display: false,
maxTicksLimit: 1
},
}
}
}
const RadarGraph = () => {
return (
<Chart type="radar" data={data} options={options}/>
)
}
export default RadarGraph;
You will need to use a scriptable function for the backgroundColor which contains the chart which contains the context like so:
const data = {
labels: labels,
datasets: [
{
data: chartData,
fill: true,
backgroundColor: ({chart: {ctx}}) => {
const bg = ctx.createLinearGradient(paramters);
// More config for your gradient
return bg;
}
},
],
};
I have the following component which I then import and use in a page. Unfortunately I am getting the error error - TypeError: Cannot read property 'labels' of undefined and data and options are underlined in the line where I pass them to ChartCard. I tried to follow the docs as close as I can but I guess I must be doing something wrong.
import faker from '#faker-js/faker'
import {
CategoryScale,
Chart as ChartJS,
Legend,
LinearScale,
LineElement,
PointElement,
Title,
Tooltip,
} from 'chart.js'
import { Line } from 'react-chartjs-2'
import BaseCard from './BaseCard'
ChartJS.register(
CategoryScale,
LinearScale,
PointElement,
LineElement,
Title,
Tooltip,
Legend
)
export async function getStaticProps() {
const options = {
responsive: true,
plugins: {
legend: {
position: 'top' as const,
},
title: {
display: true,
text: 'Price',
},
},
}
const labels = [
'January',
'February',
'March',
'April',
'May',
'June',
'July',
]
const data = {
labels,
datasets: [
{
label: 'Dataset 1',
data: labels.map(() => faker.datatype.number({ min: 2000, max: 4000 })),
borderColor: 'rgb(255, 99, 132)',
backgroundColor: 'rgba(255, 99, 132, 0.5)',
},
],
}
return {
props: { options, data },
}
}
export default function ChartCard({ options, data }) {
return (
<BaseCard>
<Line options={options} data={data} />
</BaseCard>
)
}
Edit: I've now refactored my code to have the getStaticProps in the index.js page as follows:
#index.tsx
import type { NextPage } from 'next'
import faker from '#faker-js/faker'
import ChartCard from '../components/ChartCard'
export async function getStaticProps() {
const options = {
responsive: true,
plugins: {
legend: {
position: 'top' as const,
},
title: {
display: true,
text: 'IndexCoin Price',
},
},
}
const labels = [
'January',
'February',
'March',
'April',
'May',
'June',
'July',
]
const data = {
labels,
datasets: [
{
label: 'Dataset 1',
data: labels.map(() => faker.datatype.number({ min: 2000, max: 4000 })),
borderColor: 'rgb(255, 99, 132)',
backgroundColor: 'rgba(255, 99, 132, 0.5)',
},
],
}
return {
props: { options, data },
}
}
const Home: NextPage = (options, data) => {
console.log(options)
console.log(data)
console.log(data.datasets)
return(
<ChartCard options={options} data={data} />
)
}
The console output of this is:
options: { responsive: true, plugins: { legend: [Object], title: [Object] } },
data: {
labels: [
'January', 'February',
'March', 'April',
'May', 'June',
'July'
],
datasets: [ [Object] ]
}
}
{}
undefined
And this crashes because datasets is undefined. Why is this happening?
You can only use getStaticProps in a NextJS page (i.e. component under src/pages/MyPageComponent.js).
(https://nextjs.org/docs/basic-features/data-fetching/get-static-props)
This means that your ChartCard is being called with options=undefined and data=undefined as the getStaticProps never runs.
It certainly would be nice to be able to encapsulate the server-side data fetching and rendering in one component file, but unfortunately this isn't possible right now.
What you'll need to do is to add an api to e.g. src/api/MyApi.js and call that in your component.
E.g. a quick example to start from:
src/api/MyApi.js
export default function MyApi(req, res) {
//... do your data fetching
res.send({options, data})
}
src/components/MyComponent.js
const [result, setResult] = useState();
useEffect(async ()=>{
const res = await fetch('/api/MyApi');
const result = await res.json();
setResult(result);
}, []);
const {options, data} = result ?? {};
Note the above will perform client-side data fetching so will need a live server.
If you're expecting to build static pages at build time then your only option (IIRC) is to capture ALL the data needed in the src/pages/MyPage.js's getStaticProps and pass them into the page's components as needed.
if this code is exact copy of your project there is a typo in it:
position: 'top' as const
try this:
position: 'top as const'
and also use getStaticProps for page components
In my view point, props is an object, so change your code as follow;
const Home: NextPage = ({options, data}) => {
console.log(options)
console.log(data)
console.log(data.datasets)
return(
<ChartCard options={options} data={data} />
)
}
I'm using react-Chartjs-2 pie chart for my dashboard. as per the requirement I have to show both label with data in the legend. the below component which I'm using in my application
import React, { Component } from "react";
import { Doughnut } from "react-chartjs-2";
class DoughnutChart extends Component {
constructor(props) {
super(props);
}
render() {
const chartdata = {
labels: ["Newly Added", "Edited", "Deleted"],
datasets: [
{
label: "Markets Monitored",
backgroundColor: [
"#83ce83",
"#959595",
"#f96a5d",
"#00A6B4",
"#6800B4",
],
data: [9, 5, 3],
},
],
};
return (
<Doughnut
data={chartdata}
options={{
legend: { display: true, position: "right" },
datalabels: {
display: true,
color: "white",
},
tooltips: {
backgroundColor: "#5a6e7f",
},
}}
/>
);
}
}
export default DoughnutChart;
now I'm getting chart like given below
my output
my requirement is adding values in legend(customizing chart legend). example image expected output
One way to do it would be to define data and labels before creating the chart. Then you can add the data to labels using .map method.
import React, { Component } from "react";
import { Doughnut } from "react-chartjs-2";
class DoughnutChart extends Component {
constructor(props) {
super(props);
}
render() {
let data = [9, 5, 3]
let labels = ["Newly Added", "Edited", "Deleted"]
let customLabels = labels.map((label,index) =>`${label}: ${data[index]}`)
const chartdata = {
labels: customLabels,
datasets: [
{
label: "Markets Monitored",
backgroundColor: [
"#83ce83",
"#959595",
"#f96a5d",
"#00A6B4",
"#6800B4",
],
data: data,
},
],
};
return (
<Doughnut
data={chartdata}
options={{
legend: { display: true, position: "right" },
datalabels: {
display: true,
color: "white",
},
tooltips: {
backgroundColor: "#5a6e7f",
},
}}
/>
);
}
}
export default DoughnutChart;
I'm using vue-chartjs for chart
This is my BarChart.js
import {Bar} from 'vue-chartjs'
export default {
extends: Bar,
data () {
return {
gradient: null,
gradient2: null,
datacollection: {
labels: ['January', 'February','March'],
datasets: [
{
label: 'Data One',
backgroundColor: this.gradient,
data: [40,42,99]
},
]}
}
},
mounted () {
this.gradient =
this.$refs.canvas.getContext('2d').createLinearGradient(0, 0, 0, 400);
this.gradient.addColorStop(0, 'rgba(250,274,50,1)');
this.gradient.addColorStop(1, 'rgba(250,174,50,0)');
console.log(this.$refs.canvas.getContext('2d'));
this.renderChart(this.datacollection, {responsive: true,
maintainAspectRatio: false})
}
}
And this is my Vue for it
<template>
<v-flex sm6>
<bar-chart></bar-chart>
</v-flex>
</template>
<script>
import BarChart from './BarChart.js';
export default {
components: {
BarChart
},
data() {
return {
datacollection: null
}
},
}
</script>
<style>
</style>
But I can't see the gradient, so I did console.log for this.$refs.canvas.getContext('2d') and it is referencing the bar-chart correctly but the fillstyle is not canvasgradient it is showing
CanvasRenderingContext2D
canvas:canvas#bar-chart
fillStyle:"#000000"
Well you can not reference data properties inside data properties in vue.js
data: () => ({
data1: '1',
data2: this.data1
})
This will not work tho.
You can put your datacollection directly inside the renderChart() method and then add the gradient. Or try to use computed properties