ELTerm | compatible serial terminal built with Raspberry Pi Pico | Command Line Interface library
kandi X-RAY | ELTerm Summary
kandi X-RAY | ELTerm Summary
ANSI/VT100-compatible serial terminal built with Raspberry Pi Pico and EL640.480-AM/AG screen
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of ELTerm
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QUESTION
I'm trying to create a form validation, in pure JavaScript. I have two elements to validate, a select option and a checkbox, but I can't manage to make the select-option to work.
This is the first time I try this, please be patient:
...ANSWER
Answered 2019-Apr-14 at 16:50I changed valueOf()
to value
equal to empty (when form is initialized, the field is empty, it is not null
).
Make sure that your HTML elements are correct, I saw it was wrong before, now it seems to have been corrected.
I added an else
statement to handle the errors in the case where the user corrects the validation errors.
Still, this is quite a simplification of validation, it takes a lot more work (things like min-length, max-length you might want to consider them too, as well as sanitization, trimming as mentioned by some commenters, which I will leave it to you).
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