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The SELECT element

The SELECT element. This type of element merely offers another way of capturing the kinds of user-selection that we have already seen how to capture with the INPUT elements of TYPE=checkbox and of TYPE=radio Consider the web page on the following slide.

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The SELECT element

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  1. The SELECT element • This type of element merely offers another way of capturing the kinds of user-selection that we have already seen how to capture with the INPUT elements of TYPE=checkbox and of TYPE=radio • Consider the web page on the following slide

  2. By clicking on the down-arrow, the user sees a range of options

  3. This is implemented as follows: <FORM METHOD="post" ACTION="/cgi-bin/tshirts.cgi"> <H1> T-shirt Order Form </H1> <FIELDSET> <LEGEND>Order</LEGEND> <P> What is your name? <INPUT TYPE=text NAME=name SIZE=10></P> <P>Sorry! Each order is limited to one T-shirt. Select the one you want: </P> <SELECT NAME=products> <OPTION VALUE=Batman> Batman's cloak </OPTION> <OPTION VALUE=Superman> Superman's cloak</OPTION> <OPTION VALUE="Dr. Who"> Dr. Who's coat</OPTION> </SELECT> </FIELDSET> <FIELDSET> <LEGEND>Form Submission</LEGEND> <P> <BUTTON TYPE=submit>Submit order</BUTTON></P> </FIELDSET> </FORM>

  4. SELECT element vs. INPUT element of TYPE=radio • The following SELECT element <SELECT NAME=products> <OPTION VALUE=Batman> Batman's cloak </OPTION> <OPTION VALUE=Superman> Superman's cloak</OPTION> <OPTION VALUE="Dr. Who"> Dr. Who's coat</OPTION> </SELECT> is equivalent to the following group of INPUT elements: <INPUT TYPE=radio NAME=products VALUE=Batman> Batman's cloak <INPUT TYPE=radio NAME=products VALUE=Superman> Superman's cloak <INPUT TYPE=radio NAME=products VALUE="Dr. Who"> Dr. Who's coat • They both allow ONLY ONE selection

  5. Allowing multiple selections • If we use the word MULTIPLE in the SELECT tag, multiple selections are allowed: <SELECT NAME=products MULTIPLE> <OPTION VALUE=Batman> Batman's cloak </OPTION> <OPTION VALUE=Superman> Superman's cloak</OPTION> <OPTION VALUE="Dr. Who"> Dr. Who's coat</OPTION> </SELECT> • See the next slide

  6. Preselection

  7. This is done as follows: <SELECT NAME=products MULTIPLE> <OPTION VALUE=Batman> Batman's cloak </OPTION> <OPTION VALUE=Superman SELECTED> Superman's cloak (our best-selling item)</OPTION> <OPTION VALUE="Dr. Who"> Dr. Who's coat</OPTION> </SELECT>

  8. Preselection when only one selection is allowed • Consider the following: <SELECT NAME=products> <OPTION VALUE=Batman> Batman's cloak </OPTION> <OPTION VALUE=Superman SELECTED> Superman's cloak (our best-selling item)</OPTION> <OPTION VALUE="Dr. Who"> Dr. Who's coat</OPTION> </SELECT> • Notice, on the next slide, that the Superman shirt is shown as a default, even though the Batman shirt is first in the list above

  9. What happens when the user moves to the T-shirt selection part of the form:

  10. Sizing the selection box • So far, the size of the selection box on the form has been determined by default by the browser • However, we can specify a size explicitly if we wish: <SELECT NAME=products SIZE=2> <OPTION VALUE=Batman> Batman's cloak </OPTION> <OPTION VALUE=Superman SELECTED> Superman's cloak (our best-selling item)</OPTION> <OPTION VALUE="Dr. Who"> Dr. Who's coat</OPTION> </SELECT> • See what results on the next slide

  11. The TEXTAREA element • With this element, we can allow the user to give us free-form feedback • Consider the following web page and what happens when the user fills it in as shown on the following slides

  12. How it was done: <FIELDSET> <LEGEND> Feedback </LEGEND> <P>What do you think of our products?</P> <TEXTAREA NAME=feedback ROWS=3 COLS=40> Type your answer here … </TEXTAREA> </FIELDSET> • A TEXTAREA is delimited by two tags: TEXTAREA and /TEXTAREA • The TEXTAREA tag has NAME attribute and may have attributes which specify the size of the text-entry box -- but the user’s text can be much larger than this • The text between the two tags is the initial text that appears in the text-entry box.

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