Skip to content

Vue v3 Chartjs (no build)

Jump to bottom Edit New page
Fabio Marzocca edited this page Jul 16, 2022 · 5 revisions

This is an example of using Chartjs with Node-Red, uibuilder, Vue v3. The example is using Quasar, but it is not mandatory.

Note that it uses the IIFE version of the uibuilder front-end library from uibuilder v5.1.1+.

The function loadChartData() shows how to correctly feed data into the chart, while updateChartData() provides to update it when a new data arrives.

index.html

<!doctype html>
<html lang="en">

<head>

    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <title>Chartjs example - Node-RED uibuilder</title>
    <meta name="description" content="Node-RED uibuilder - Chartjs">
    <link rel="icon" href="./images/node-blue.ico">

    <link href="https://cdn.jsdelivr.net/npm/quasar@latest/dist/quasar.prod.css" rel="stylesheet" type="text/css">

</head>

<body class="uib bg-grey-1">

    <div id="my-app" class="q-ma-md" style="min-height: 100vh;">
        <div class="q-pa-md q-gutter-md row items-start justify-center">
            <q-card bordered style="width:100%; max-width:600px">
                <q-card-section>
                    <canvas id="uibChart" height="350" width="500" class="bg-grey-1"></canvas>
                </q-card-section>
            </q-card>
        </div>
    </div>


    <!-- #region Supporting Scripts. These MUST be in the right order. Note no leading / -->
    <script src="https://cdn.jsdelivr.net/npm/vue@latest/dist/vue.global.prod.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/quasar@latest/dist/quasar.umd.prod.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/chart.js@^3"></script>
    <script src="../uibuilder/uibuilder.iife.min.js">/* REQUIRED. NB: socket.io not needed */</script>
    <script src="./index.js">/* OPTIONAL: Put your custom code here */</script>
    <!-- #endregion -->

</body>

</html>

index.js

/* eslint-disable strict */
/* jshint browser: true, esversion: 6, asi: true */
/* globals uibuilder */
// @ts-nocheck

'use strict'
const { createApp, ref } = Vue
Quasar.lang.set(Quasar.lang.enGB)

const configLine = {
    type: 'line',
    labels: [],
    data: {
        datasets: [{
            label: "My data 1",
            data: [],
            borderColor: "deepskyblue"
        },
        {
            label: "My random data",
            data: [],
            borderColor: "indianred"
        }]
    },
    options: {
        scales: {
            x: {
                grid: {
                    drawBorder: true,
                },
            }
        },
        plugins: {
            title: {
                font: {
                    size: 18
                },
                display: true,
                text: "My Chart"
            },
        }
    }
};

const myChartData = [{ "x": "08:51", "y": 220 }, { "x": "08:52", "y": 220 }, { "x": "08:53", "y": 221 }, { "x": "08:54", "y": 222 }, { "x": "08:55", "y": 223 }, { "x": "08:56", "y": 224 }, { "x": "08:57", "y": 225 },
{ "x": "08:58", "y": 226 }, { "x": "08:59", "y": 226 }, { "x": "09:00", "y": 228 }, { "x": "09:01", "y": 229 }, { "x": "09:02", "y": 230 }, { "x": "09:03", "y": 230 }, { "x": "09:04", "y": 231 },
{ "x": "09:05", "y": 233 }, { "x": "09:06", "y": 234 }, { "x": "09:07", "y": 235 }, { "x": "09:08", "y": 236 }, { "x": "09:09", "y": 237 }, { "x": "09:10", "y": 239 }, { "x": "09:11", "y": 240 },
{ "x": "09:12", "y": 240 }, { "x": "09:13", "y": 242 }, { "x": "09:14", "y": 243 }, { "x": "09:15", "y": 245 }, { "x": "09:16", "y": 245 }, { "x": "09:17", "y": 247 }, { "x": "09:18", "y": 248 },
{ "x": "09:19", "y": 250 }, { "x": "09:20", "y": 251 }, { "x": "09:21", "y": 253 }, { "x": "09:22", "y": 254 }, { "x": "09:23", "y": 256 }, { "x": "09:24", "y": 258 }, { "x": "09:25", "y": 260 }];

const app = Vue.createApp({
    data() {
        return {
        }
    }, // --- End of data --- //

    methods: {
        loadChartData: function (data) {
            data.forEach(element => {
                historyChartjs.data.labels.push(element.x)
                historyChartjs.data.datasets[0].data.push(element.y)
                /* a random dataset */
                historyChartjs.data.datasets[1].data.push(Math.random() * 201)
            })
            historyChartjs.update()
        },

        updateChartData: function (obj) {
            historyChartjs.data.labels.push(obj.x);
            historyChartjs.data.datasets[0].data.push(obj.y)
            /* random dataset */
            historyChartjs.data.datasets[1].data.push(Math.random() * 201)
            historyChartjs.update();
        },
    },

    mounted: function () {
        uibuilder.onChange('msg', (msg) => {
            if (msg.topic === 'chart/newdata') { this.updateChartData(msg.payload) } //a new chart value has arrived. Update it
        })
        window.historyChartjs = new Chart(document.getElementById("uibChart"), configLine);
        this.loadChartData(myChartData);
    }

})

app.use(Quasar, { config: {} })
app.mount('#my-app')
Schermata 2022-07-16 alle 11 31 07

Please feel free to add comments to the page (clearly mark with your initials & please add a commit msg so we know what has changed). You can contact me in the Discourse forum, or raise an issue here in GitHub! I will make sure all comments & suggestions are represented here.

Clone this wiki locally