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How can I update chartjs getdom with fade in/ fade out

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  • D Offline
    doridol
    last edited by Jul 9, 2021, 2:25 AM

    My chart updated instantly disappear and show when I use updateDom.
    I’ve already used updateDon(self.config.animationSpeed) but it seems anything change

    MMM-Chart.js code

    Module.register("MMM-Chart", {
            defaults: {
                updateInterval: 2000,
    
            },
                
            getScripts: function () {
                return ["modules/" + this.name + "/node_modules/chart.js/dist/Chart.min.js"];  // use right file name
            },
        
            start: function () {
                // Log.info("Starting module: " + this.name);
                // requiresVersion: "2.1.0";
                // this.loaded = false;
                this.scheduleUpdate();
                // this.config = Object.assign({}, this.defaults, this.config);
                // Log.info("Starting module: " + this.name);
        
            },
    
            scheduleUpdate: function () {
                setInterval(() => {
                    this.getData();
                }, 
                this.config.updateInterval);
                this.getData();
            },
    
            getData: function() {
                console.log('GET_TEXT_DATA', this.config)
                this.sendSocketNotification('GET_TEXT_DATA', this.config);
            },
        
            socketNotificationReceived: function (notification, payload) {
                if (notification === "TEXT_RESULT") {
                    this.textDataRecived = payload;
                    this.loaded = true;
                } 
                this.updateDom(this.config.animationSpeed);
            },
        
            getDom: function () {
                
                const wrapper = document.createElement("div");
                
                this.ctx = document.createElement("canvas");
                this.ctx.style.width = "700px";
                this.ctx.style.height = '700px';
                
                wrapper.appendChild(this.ctx)
                
                labels = [2,4,6,8,10,12,14,16,18,20,22,00]
                
                this.myChart = new Chart(this.ctx, {
    
                    type: 'line',
                    data: {
                        labels: labels,
                        
                        datasets: [{
                            
                            data: this.textDataRecived,
    
                            backgroundColor: 'rgba(255,255,255,0.3)',
                            borderColor: 'white',
                            
                            borderWidth: 2,
                            
                            fill: true,
                            
                        }]
                    },
    
                    options: {
    
                        title: {
                                display: true,
                                text: 'Air-Quality',
                        },
    
                        scales: {
    
                            xAxes: [{
    
                                // type: "time" ,
    
                                // time: {
                                //     unit: "hour",
                                // },
    
                                gridLines: {
                                    color: 'rgba(255,255,255,0.2)',
                                },
            
                            }],
    
    
                        },
                    }
                });
        
                return wrapper;
            }
        });
    

    node_helper.js code

    const spawn = require('child_process').spawn;
    const NodeHelper = require("node_helper");
    
    var self;
    
    module.exports = NodeHelper.create({
    
        start: function () {
            self = this;
            console.log("Starting node_helper for: " + this.name);
        },
    
        getData: function () {
    
            const result = spawn('python', ['/home/pi/MagicMirror/modules/MMM-Chart/Dust_Db.py']);
    
            result.stdout.on('data', function(data) {
                recivedData = data.toString();
                recivedData = recivedData.split(/[^0-9]/g)
    
                for (var i in recivedData) {
                    if (recivedData[i] == '') {
                        recivedData.splice(i, 1)
                    }
                }
                console.log(recivedData)
                self.sendSocketNotification('TEXT_RESULT', recivedData);
            });
    		  
    		  process.on('exit', function() {
    			if (x) {
    			  x.kill();
    			}
    		  });
        },
    
        socketNotificationReceived: function (notification, payload) {
    
            if (notification === 'GET_TEXT_DATA') {
                self.getData();
            }
        },
    });
    

    and my config.js

                    {
    			module: "MMM-Chart",
    			position: "bottom_center",
    			animationSpeed: 3000,
    		},
    

    What should I do to update my chart with fade in and fade out animation?

    S 1 Reply Last reply Jul 9, 2021, 3:02 AM Reply Quote 0
    • S Away
      sdetweil @doridol
      last edited by sdetweil Jul 10, 2021, 12:25 PM Jul 9, 2021, 3:02 AM

      @doridol you will have to use css to get fading. and u will want to carefully manage the canvas the chart is in. don’t recreate is in every getDom, else the chart will flash

      the time delay in updateDom() is to control how fast it changes, not provide animation

      Sam

      How to add modules

      learning how to use browser developers window for css changes

      D 1 Reply Last reply Jul 12, 2021, 4:13 AM Reply Quote 0
      • D Offline
        doridol @sdetweil
        last edited by Jul 12, 2021, 4:13 AM

        @sdetweil how can I update my chart without flashig?

        S 1 Reply Last reply Jul 12, 2021, 12:29 PM Reply Quote 0
        • S Away
          sdetweil @doridol
          last edited by Jul 12, 2021, 12:29 PM

          @doridol create the div and canvas only once, and reuse it.

          Sam

          How to add modules

          learning how to use browser developers window for css changes

          1 Reply Last reply Reply Quote 0
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