Let us now write the Java Script function that behaves as the on Click handler for the second button in the above form.where, o Form is a reference to the form object passed to the function using as shown in the form above.
When form input is important, it should always be verified using a secure server-side script.
Validating form input with Java Script is easy to do and can save a lot of unnecessary calls to the server as all processing is handled by the web browser.
It can prevent people from leaving fields blank, from entering too little or too much or from using invalid characters.
I usually just give each checkbox a unique name and parse all of the individual values in PHP, but this has always struck me as an ugly way to handle this use case.
As I was looking up the syntax for an HTML checkbox, I found a lot of info that said I could simply name all of the checkboxes the same and it would group all of the values together like this: But this doesn’t work.
I would like to show an alert if no check box was checked in a field.