In most cases you
want to make sure that a user actually enters something into input fields and not just
leave them blank. This can best be done on the server side with a script language command
checking for the length of the contents of the variable in question, but it can also be
done directly in WML.
In WML this is done by using the correct formatting codes, or if that's not supported,
adding a parameter called emptyok=false to the input tag. Note that it
only means that the user cannot force the input to be blank. If you leave out the value="something"
parameter or put value=" " the user can still send empty
fields.
The following line will accept any value to the "username" field, even if the
user clears the field completely. He will be able to return from input mode, even if the
field contains nothing.
<input name="username" type="text" value="Enter
something" format="*M"/>
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The following line will
accept any value to the "username" field, except if the user clears the field
completely. He will not be able to return from input mode until the field contains
something.
<input name="username" type="text" value="Enter
something" format="M*m"/>
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However, the above applies
to most browsers. On Nokia 7110, the emptyok parameter must be
used to get the same effect:
<input name="username" type="text" value="Enter
something" format="*M"
emptyok="false"/> |
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