Unofficial Nextion/TJC User Forum

Change a components id number once placed on a page

Software Development
#1

Ok so I have quite a busy page and one of the multiple components on the page is now out of sequence with the rest (16 * bank of two state switches).
I want to simplify my event code and use a for loop to go through each bank of switches.
With one ID now out of sequence, is there a way to change a component ID without inputting the whole page of components in the correct sequential sequence??

Any suggestions would be appreciated

#2

Hi @Crusty,

The ID corresponds to the order on screen. Topmost components have the highest IDs. You can reorder them by cut&paste or by using the “bring to top/bottom” buttons in the Nextion Editor. However, there is no way to increment/decrement the ID. You’re limited to putting a (group of) components to either end.

Hope this helps!
Max

#3

I thought this might be the case.
At the moment I do not see a mechanism to be able to use a sequence of component names in a for loop.
Which is why I asked if the ID’s could be renumbered in any way.
If any one knows how to use n1.val, n2.val, n3.val, n4.val say in a loop I would much appreciate a push in the right direction. As I can easily reorder a component name to be in sequence??

#4

Nope, no other way than using the b[id] array. Usually you’d define a custom array with pointers to each component but nextion doesn’t allow you to define custom arrays.
So reordering is your only option.

Kind regards,
Max

#5

Thanks for the confirmation. In direct C I would be doing as you say.
Now I have all my 2 state switches working in the required way along with all the other elements I need on the page I have opened a new version of a project.
The new project will make sure the components are installed in a sequential order where needed.

#6

You can still put them in whichever order you need. Just reorder them by sending each component to back or to front as you see fit.

#7

Many thanks for your help, I have been able to make the id values sequential.
I had had mistaken “bring to top” and “bring to bottom” of the ID array, as being some like “bring to front” and “bring to back” as with a drwawing object.
The process needs a lot of thinking about to get every thing ordered the way it should be, buts is possible and works.
Many thanks.

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