@justjim1220 Same for me I am absolutely new to javascript. I generally know the system const because I use a lot of c++, but testing here seems like the variables actually get not deleted after SocketNotificationreceived function ends. And I have absolutely no clue on when to use the type let and which advantage it offers over var, because on some variables let works on others only var. const actually never worked in there.

I have my code here not fully ready yet:

socketNotificationReceived: function(notification, payload) {
    if (notification === 'HIDE_SHOW') {
	
	var obj = JSON.parse(payload.data.toString());
	
	var max = obj.slots.length;

	for (let i = 0; i < max; ++i){
                if (obj.slots[i].slotName === "HIDE" ||
                    obj.slots[i].slotName === "SHOW") {
                    var HideShow = obj.slots[i].slotName;
                }
            }

            for (let i = 0; i < max; ++i){
                if (obj.slots[i].slotName === "MODULE") {
                    var Module = obj.slots[i].value.value;
			break;
                }
            }
            var Message = HideShow + "_" + Module;

		
		const moduleToMove = 'clock';
		const targetRegion = 'top.left';
		
		MM.getModules().enumerate((module) => {
		    if (module.name === moduleToMove) {
		        const instance = document.getElementById(module.identifier);
		        const region = document.querySelector(`div.region.${targetRegion} div.container`);
		        region.appendChild(instance);
			//region.insertBefore(instance, region.childNodes[0])
		        region.style.display = 'block';
		    }
		});
      	this.loaded = true;
	this.sendNotification(Message);
    }

    if (notification === 'ERROR') {
      this.sendNotification('SHOW_ALERT', payload);
    }
  }

So at which positions would it be better to use const/let instead of var? And how is the performance of them? Because in c++ I definetly use const a lot for variables or member functions

@justjim1220 it already works the way @strawberry-3-141 proposed :)
Only thing I am not quite sure about yet is when can I use const?
I have the code in socketmessagereceived. Can I use const in there when I do only give the variable one value each time it runs the function? Because for me it seems like the variables still exist when the function gets called again which would mean const does not work

@strawberry-3-141 ty that works.

Added the possibility

region.insertBefore(instance, region.childNodes[0])

so I can prepend and append the module

@strawberry-3-141 so in general use all 3 commands and then it works in both senarios? where can I find the right ID for each module?

Ah did not know that ;) well yes then it’s definetly in my program. All my program does so far is subscribe to a mqtt broker, load some data and according to this show/hide modules. Now I want to add the possibility to move modules to different positions.
Can send the current code later

In general I want to add it to all kind of modules so I can change the position when sending them a socketmessage to do so

@strawberry-3-141 and where to add that? is that already the “end code”? I tried in the domupdate function and it did not work, so I guess that was wrong

@strawberry-3-141 So I always have to know wether there is already a element in that region? Is there a way to check all modules and return the ID’s of the elements that are in this position?

@Mykle1 yes the animation is really impressive will have to see wether I get it running or otherwise might try to get my old laptop mainboard back ^^
I think only the power supply is broken

@strawberry-3-141 Can you help me with how that would look like in software? I am sorry this project is the first time I use javascript at all and absolutely clueless when it’s about the dom