found a cool bug

[Guan-Wei Chu]

hello 

I am a student from taiwan

Like what I do in the viedo
when I was put a block to set my web item url to my node-red server

but something wired happened

in video I hold on a second

and I fresh the browser 

and..my code disappear

can somebody help me with that QAQ?

viedo is here :
https://drive.google.com/open?id=15pdkXObOJ28w-6G2yvmDzbz56z1LDd-I

[ABG]

Do you have an exported .aia file you could post?

If you stumbled onto a bug, it most likely came from

trying to feed a URL into a math + block,

instead of into a more likely text JOIN block.

ABG

[Chris Ward]

Hello Guan-Wei

The disappearance of your code is not to do with App Inventor - you must not use the Browser "refresh" button. App Inventor is a web-based program, not an ordinary web page.

However, in your code you try to join text using a math block. To join text, use a join text block:

[Evan Patton]

Yes, this is a known problem. You can put a text block with a number into a + operator and it will accept that. When you change the contents to a non-text value, it will fail to reload due to the type checking applied at that time. It's something we are working on fixing.

Regards,

Evan

[Guan-Wei Chu]

thank you!! that slove my Problem