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16.3 Text Controls

395

TARGET

The 

TARGET

 attribute is used by frame capable browsers to determine 

which frame cell should be used to display the results of the servlet or 

other program handling the form submission. The default is to display 

the results in whatever frame contains the form being submitted.

ONSUBMIT and ONRESET

These attributes are used by JavaScript to attach code that should be 

evaluated when the form is submitted or reset. For 

ONSUBMIT

, if the 

expression evaluates to 

false

, the form is not submitted. This case lets 

you invoke JavaScript code on the client that checks the format of the 

form field values before they are submitted, prompting the user for 

missing or illegal entries.

ACCEPT and ACCEPT CHARSET

These attributes are new in HTML 4.0 and specify the MIME types 

(

ACCEPT

) and character encodings (

ACCEPT CHARSET

) that must be 

accepted by the servlet or other program processing the form data. The 

MIME types listed in 

ACCEPT

 could also be used by the client to limit 

which file types are displayed to the user for file upload elements.

16.3 Text Controls

HTML supports three types of text input elements: textfields, password

fields, and text areas. Each is given a name, and the value is taken from the

content of the control. The name and value are sent to the server when the

form is submitted, which is typically done by means of a submit button (see

Section 16.4).

Textfields

HTML Element:

(No End Tag)

Attributes:

NAME

 (required), 

VALUE

, 

SIZE

, 

MAXLENGTH

, 

ONCHANGE

, 

ONSELECT

, 

ONFOCUS

, 

ONBLUR

, 

ONKEYDOWN

, 

ONKEYPRESS

, 

ONKEYUP

This element creates a single line input field where the user can enter text, as

illustrated earlier in Listings 16.1, 16.2, and 16.3. For multiline fields, see

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

Servlet and JSP training courses by book's author: courses.coreservlets.com.