Limit number of characters allowed in form input text field

by

maxlength:

The maximum number of characters that will be accepted as input. This can be greater that specified by SIZE , in which case the field
will scroll appropriately. The default is unlimited.

<input type="text" maxlength="2" id="sessionNo" name="sessionNum" onkeypress="return isNumberKey(event)" />

However, this may or may not be affected by your handler. You may need to use or add another handler function to test for length, as well.

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