gauge.js

[sispheor]

Hello guys, I’m trying to make working the gauge.js lib on my MM.

Nothing appears on the screen. No error in logs or the console.

Here is what I do, I just copied the content of the example available here.

getScripts: function() {
        return ["http://bernii.github.io/gauge.js/dist/gauge.min.js"];
    },

 getDom: function () {
        let wrapper = document.createElement("div");
        // add a gauge
        let opts = {
          angle: 0.15, /// The span of the gauge arc
          lineWidth: 0.44, // The line thickness
          pointer: {
            length: 0.9, // Relative to gauge radius
            strokeWidth: 0.035 // The thickness
          },
          colorStart: '#6FADCF',   // Colors
          colorStop: '#8FC0DA',    // just experiment with them
          strokeColor: '#E0E0E0'   // to see which ones work best for you
        };
        let target = document.createElement("canvas");
        let gauge = new Gauge(target).setOptions(opts); // create sexy gauge!
        gauge.maxValue = 3000; // set max gauge value
        gauge.setMinValue(0);  // set min value
        gauge.set(1250); // set actual value
        wrapper.appendChild(target);

       return wrapper;
}

Any idea of what I’m missing here?

Thanks a lot !

[E3V3A]

@sispheor Another wnaker repo talking about “cool looking JavaScript gauge” without a single picture on the page.

[sispheor]

@E3V3A demo pictures are on the first link I left.
But yes, the GitHub repo should also contains some.

[Charley]

You may need a start!

start: function () {
    
},

[sispheor]

@Charley yes, I haven’t shown it but it’s present.

[Charley]

What is the code in your start.
I expect you don’t add the wrapper to the dom

[sispheor]

@Charley here is the code
https://github.com/Sispheor/MMM-BMP-sensor/blob/dev/MMM-BMP-sensor.js

[Charley]

@sispheor Is everything invisible or just the gauge?
Do you see pressure or temperatures?
What is in your console.log from

console.log('adafruit_python_bpm.py results: %j', results[0]);

[sispheor]

@Charley Yes the table is visible. Only the gauge doesn’t appear.

[Charley]

Okay I might have an idea

Change your createElement part to

let mycanvas = document.createElement("div");
mycanvas.id=("divcanvas")
let target=document.getElementById("divcanvas")

[sispheor]

@Charley OK thanks, I’ll try this in a couple minutes.

[sispheor]

@Charley Doesn’t work…

Uncaught TypeError: Cannot read property 'getContext' of null

[Charley]

Maybe you could try this

let mycanvas = document.createElement("canvas");   // changed from div to canvas
mycanvas.id=("divcanvas")
let target=document.getElementById("divcanvas")

I made a typo yesterday

[sispheor]

@Charley yes it’s what I tried…

[sispheor]

I tried with another lib called canvas-gauges. It’s the same. The canvas doesn’t appear on the screen

I’m wondering if a parent CSS config or something like could be the reason.

[sispheor]

It’s good it works!! For the last lib I just forgot to call the draw method.