Uploading code that contains library requirement

Hello!
I'm developing a standalone web page that shows the data of the sensors of the BangleJS 2 plus some beacons. This page contains a JavaScript code that uploads the code on-the-fly using Puck.JS write() function, which I think is like writing to the console in the Web IDE, as showed in the https://www.espruino.com/Bangle.js+Data+Streaming tutorial

The problem is that the code I use on the Bangle uses the Layout library. If I try to run the code using the Web IDE, everything works ok, but if I try to run the same code by uploading it it fails on the require("Layout") statement. The same happens if I use the REPL console of the Web IDE.

Is there a way to fix this?

3 Attachments

• banglejs.js
• main.js
• index.html

Ahh - yes, you have a few options:

• Probably the easiest is to just use the IDE to upload then Layout library to a file called Layout on the Bangle first.
  
• Or you can upload the complete file including the library. Easiest ways to get that are:
  
  • Just upload with the IDE, then download the file the IDE uploaded and copy/paste it into your web app
    
  • use the espruino CLI tool from NPM (https://www.npmjs.com/package/espruino) - espruino mycode.js -o output.js should do it
    

Ok so I've tried the first workaround, in which I created a file that just contains

const Layout = require("Layout");

saved as Layout in the Bangle.

But then even if the `const Layout = require("Layout") from my script seems to get executed, the interpreter raises an error when actually trying to build the Layout:

Uncaught Error: Constructor should be a function, but is Object
 at line 1 col 18
let layout = new Layout({

I'm a newbie in JavaScript, but I think that this means the import didn't actually work.

I was tempted by the usage of the espruino tool but I'd like to keep the web page self-contained without depending on a Node.js installation.
Maybe it's possible to upload a file (thus a script) and "execute" from the console? I'm guessing how the IDE does that...

Ok so I've tried the first workaround, in which I created a file that just contains

const Layout = require("Layout");

saved as Layout in the Bangle.

That is not how it was meant. You created a loop and you are lucky the universe did not explode :-)

The Layout file in storage is the one that gets loaded when code require("Layout") is run, the require implementation searches for it in the storage too. So it must contain the real implementation of the layout code (that IDE otherwise bundles automatically into your code) and not the code that calls require("Layout") again.

So I guess you could upload Layout.min.js from
https://github.com/espruino/BangleApps/tree/master/modules as is to storage file named "Layout" and it will work?

EDIT: Looks like it is actually described as an option here https://github.com/espruino/BangleApps/tree/master/modules#upload-the-module-to-the-bangles-internal-storage

That is not how it was meant. You created a loop and you are lucky the universe did not explode :-)

Whoops, yeah it's like chained #include in C/C++

Ok now just uploading the Layout.min.js solved the issue and the program works as intended. Now the only thing that remains to try is to find a way to automatically upload the file to a BangleJS (or embedding the Layout library in the script, even if it's kind of ugly).

Thanks for the patience!
Best regards

Glad you got it sorted!

I was tempted by the usage of the espruino tool but I'd like to keep the web page self-contained

Just so you know, what I meant was to run the espruino command offline and then save the 'compiled' JS alongside your page. Although that does require something to be some every time you make a change to the underlying firmware.

If you really want to embed the layout script in the file, you can add this to the front of your file:

Modules.addCached("Layout",function() {
  function p(d,h){function b(e){"ram";e.id&&(a[e.id]=e);e.type||(e.type="");e.c&&e.c.forEach(b)}this._l=this.l=d;this.options=h||{};this.lazy=this.options.lazy||!1;this.physBtns=1;let f;if(2!=process.env.HWVERSION){this.physBtns=3;f=[];function e(l){"ram";"btn"==l.type&&f.push(l);l.c&&l.c.forEach(e)}e(d);f.length&&(this.physBtns=0,this.buttons=f,this.selectedButton=-1)}if(this.options.btns)if(d=this.options.btns,this.physBtns>=d.length){this.b=d;let e=Math.floor(Bangle.appRect.h/
this.physBtns);for(2<this.physBtns&&1==d.length&&d.unshift({label:""});this.physBtns>d.length;)d.push({label:""});this._l.width=g.getWidth()-8;this._l={type:"h",filly:1,c:[this._l,{type:"v",pad:1,filly:1,c:d.map(l=>(l.type="txt",l.font="6x8",l.height=e,l.r=1,l))}]}}else this._l.width=g.getWidth()-32,this._l={type:"h",c:[this._l,{type:"v",c:d.map(e=>(e.type="btn",e.filly=1,e.width=32,e.r=1,e))}]},f&&f.push.apply(f,this._l.c[1].c);this.setUI();var a=this;b(this._l);this.updateNeeded=!0}function t(d,
h,b,f,a){var e=null==d.bgCol?a:g.toColor(d.bgCol);if(e!=a||"txt"==d.type||"btn"==d.type||"img"==d.type||"custom"==d.type){var l=d.c;delete d.c;var k="H"+E.CRC32(E.toJS(d));l&&(d.c=l);delete h[k]||((f[k]=[d.x,d.y,d.x+d.w-1,d.y+d.h-1]).bg=null==a?g.theme.bg:a,b&&(b.push(d),b=null))}if(d.c)for(var c of d.c)t(c,h,b,f,e)}p.prototype.setUI=function(){Bangle.setUI();let d;this.buttons&&(Bangle.setUI({mode:"updown",back:this.options.back,remove:this.options.remove},h=>{var b=this.selectedButton,f=this.buttons.length;
if(void 0===h&&this.buttons[b])return this.buttons[b].cb();this.buttons[b]&&(delete this.buttons[b].selected,this.render(this.buttons[b]));b=(b+f+h)%f;this.buttons[b]&&(this.buttons[b].selected=1,this.render(this.buttons[b]));this.selectedButton=b}),d=!0);!this.options.back&&!this.options.remove||d||Bangle.setUI({mode:"custom",back:this.options.back,remove:this.options.remove});if(this.b){function h(b,f){.75<f.time-f.lastTime&&this.b[b].cbl?this.b[b].cbl(f):this.b[b].cb&&this.b[b].cb(f)}Bangle.btnWatches&&
Bangle.btnWatches.forEach(clearWatch);Bangle.btnWatches=[];this.b[0]&&Bangle.btnWatches.push(setWatch(h.bind(this,0),BTN1,{repeat:!0,edge:-1}));this.b[1]&&Bangle.btnWatches.push(setWatch(h.bind(this,1),BTN2,{repeat:!0,edge:-1}));this.b[2]&&Bangle.btnWatches.push(setWatch(h.bind(this,2),BTN3,{repeat:!0,edge:-1}))}if(2==process.env.HWVERSION){function h(b,f){b.cb&&f.x>=b.x&&f.y>=b.y&&f.x<=b.x+b.w&&f.y<=b.y+b.h&&(2==f.type&&b.cbl?b.cbl(f):b.cb&&b.cb(f));b.c&&b.c.forEach(a=>h(a,f))}Bangle.touchHandler=
(b,f)=>h(this._l,f);Bangle.on("touch",Bangle.touchHandler)}};p.prototype.render=function(d){function h(c){"ram";b.reset();void 0!==c.col&&b.setColor(c.col);void 0!==c.bgCol&&b.setBgColor(c.bgCol).clearRect(c.x,c.y,c.x+c.w-1,c.y+c.h-1);f[c.type](c)}d||(d=this._l);this.updateNeeded&&this.update();var b=g,f={"":function(){},txt:function(c){"ram";if(c.wrap){var m=b.setFont(c.font).setFontAlign(0,-1).wrapString(c.label,c.w),n=c.y+(c.h-b.getFontHeight()*m.length>>1);b.drawString(m.join("\n"),c.x+(c.w>>
1),n)}else b.setFont(c.font).setFontAlign(0,0,c.r).drawString(c.label,c.x+(c.w>>1),c.y+(c.h>>1))},btn:function(c){"ram";var m=c.x+(0|c.pad),n=c.y+(0|c.pad),q=c.w-(c.pad<<1),r=c.h-(c.pad<<1);m=[m,n+4,m+4,n,m+q-5,n,m+q-1,n+4,m+q-1,n+r-5,m+q-5,n+r-1,m+4,n+r-1,m,n+r-5,m,n+4];n=void 0!==c.btnBorderCol?c.btnBorderCol:b.theme.fg2;q=void 0!==c.btnFaceCol?c.btnFaceCol:b.theme.bg2;c.selected&&(q=b.theme.bgH,n=b.theme.fgH);b.setColor(q).fillPoly(m).setColor(n).drawPoly(m);void 0!==c.col&&b.setColor(c.col);c.src?
b.setBgColor(q).drawImage("function"==typeof c.src?c.src():c.src,c.x+c.w/2,c.y+c.h/2,{scale:c.scale||void 0,rotate:.5*Math.PI*(c.r||0)}):b.setFont(c.font||"6x8:2").setFontAlign(0,0,c.r).drawString(c.label,c.x+c.w/2,c.y+c.h/2)},img:function(c){"ram";b.drawImage("function"==typeof c.src?c.src():c.src,c.x+c.w/2,c.y+c.h/2,{scale:c.scale||void 0,rotate:.5*Math.PI*(c.r||0)})},custom:function(c){"ram";c.render(c)},h:function(c){"ram";c.c.forEach(h)},v:function(c){"ram";c.c.forEach(h)}};if(this.lazy){this.rects||
(this.rects={});var a=this.rects.clone(),e=[];t(d,a,e,this.rects,null);for(var l in a)delete this.rects[l];d=Object.keys(a).map(c=>a[c]).reverse();for(var k of d)b.setBgColor(k.bg).clearRect.apply(g,k);e.forEach(h)}else h(d)};p.prototype.forgetLazyState=function(){this.rects={}};p.prototype.layout=function(d){var h={h:function(b){"ram";var f=b.x+(0|b.pad),a=0,e=b.c&&b.c.reduce((k,c)=>k+(0|c.fillx),0);e||(f+=b.w-b._w>>1,e=1);var l=f;b.c.forEach(k=>{k.x=0|l;f+=k._w;a+=0|k.fillx;l=f+Math.floor(a*(b.w-
b._w)/e);k.w=0|l-k.x;k.h=0|(k.filly?b.h-(b.pad<<1):k._h);k.y=0|b.y+(0|b.pad)+((1+(0|k.valign))*(b.h-(b.pad<<1)-k.h)>>1);if(k.c)h[k.type](k)})},v:function(b){"ram";var f=b.y+(0|b.pad),a=0,e=b.c&&b.c.reduce((k,c)=>k+(0|c.filly),0);e||(f+=b.h-b._h>>1,e=1);var l=f;b.c.forEach(k=>{k.y=0|l;f+=k._h;a+=0|k.filly;l=f+Math.floor(a*(b.h-b._h)/e);k.h=0|l-k.y;k.w=0|(k.fillx?b.w-(b.pad<<1):k._w);k.x=0|b.x+(0|b.pad)+((1+(0|k.halign))*(b.w-(b.pad<<1)-k.w)>>1);if(k.c)h[k.type](k)})}};if(h[d.type])h[d.type](d)};p.prototype.debug=
function(d,h){d||(d=this._l);h=h||1;g.setColor(h&1,h&2,h&4).drawRect(d.x+h-1,d.y+h-1,d.x+d.w-h,d.y+d.h-h);d.pad&&g.drawRect(d.x+d.pad-1,d.y+d.pad-1,d.x+d.w-d.pad,d.y+d.h-d.pad);h++;d.c&&d.c.forEach(b=>this.debug(b,h))};p.prototype.update=function(){function d(a){"ram";b[a.type](a);if(a.r&1){var e=a._w;a._w=a._h;a._h=e}a._w=Math.max(a._w+(a.pad<<1),0|a.width);a._h=Math.max(a._h+(a.pad<<1),0|a.height)}delete this.updateNeeded;var h=g,b={txt:function(a){"ram";a.font.endsWith("%")&&(a.font="Vector"+Math.round(h.getHeight()*
a.font.slice(0,-1)/100));if(a.wrap)a._h=a._w=0;else{var e=g.setFont(a.font).stringMetrics(a.label);a._w=e.width;a._h=e.height}},btn:function(a){"ram";a.font&&a.font.endsWith("%")&&(a.font="Vector"+Math.round(h.getHeight()*a.font.slice(0,-1)/100));var e=a.src?h.imageMetrics("function"==typeof a.src?a.src():a.src):h.setFont(a.font||"6x8:2").stringMetrics(a.label);a._h=16+e.height;a._w=20+e.width},img:function(a){"ram";var e=h.imageMetrics("function"==typeof a.src?a.src():a.src),l=a.scale||1;a._w=e.width*
l;a._h=e.height*l},"":function(a){"ram";a._w=0;a._h=0},custom:function(a){"ram";a._w=0;a._h=0},h:function(a){"ram";a.c.forEach(d);a._h=a.c.reduce((e,l)=>Math.max(e,l._h),0);a._w=a.c.reduce((e,l)=>e+l._w,0);null==a.fillx&&a.c.some(e=>e.fillx)&&(a.fillx=1);null==a.filly&&a.c.some(e=>e.filly)&&(a.filly=1)},v:function(a){"ram";a.c.forEach(d);a._h=a.c.reduce((e,l)=>e+l._h,0);a._w=a.c.reduce((e,l)=>Math.max(e,l._w),0);null==a.fillx&&a.c.some(e=>e.fillx)&&(a.fillx=1);null==a.filly&&a.c.some(e=>e.filly)&&
(a.filly=1)}},f=this._l;d(f);delete b;f.fillx||f.filly?(f.w=Bangle.appRect.w,f.h=Bangle.appRect.h,f.x=Bangle.appRect.x,f.y=Bangle.appRect.y):(f.w=f._w,f.h=f._h,f.x=Bangle.appRect.w-f.w>>1,f.y=Bangle.appRect.y+(Bangle.appRect.h-f.h>>1));this.layout(f)};p.prototype.clear=function(d){d||(d=this._l);g.reset();void 0!==d.bgCol&&g.setBgColor(d.bgCol);g.clearRect(d.x,d.y,d.x+d.w-1,d.y+d.h-1)};exports=p
});

It's what the IDE does automatically for you