Avoid numbers input beginning by comma, or négative numbers


in my app i use a input text and use the comparator <
when i enter a number beginning by comma i get a message error

The operation < cannot accept the argument , [.] [1]

can you help ?


Is that in a maths block or a text block you do the comparison.

Out of interest, what number begins with a comma ?

Post a Downloaded Blocks Image of the procedure or event block containing the error, along with sample data.


I don’t want the user input numbers beginning by comma
It’s just treatment to avoid errors while usine app


Try with this extension:

It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.

To get an image of your blocks, right click in the Blocks Editor and select "Download Blocks as Image". You might want to use an image editor to crop etc. if required. Then post it here in the community.


Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.


here is the block i use

i will look for this side of block text :



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