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Oracle Tips by Burleson 

Multiple Select Lists

Multiple Select Lists are much like select lists but allow the user to select more than one value at a time.  Just like Select Lists, this is based on a LOV to populate the list.  An example of a multiple select could be something like shown in Figure 10.25.

Notice in Figure 10.25, that there is a scroll bar for the box.  This is another feature of the multiple select lists.  There can be more values than are shown on the page.  The length of the list can be controlled.

This type of item is good to use whenever the developer needs someone to select one or more items from a list.  Some examples might include a pizza web site with a list of toppings or a maybe a new car purchasing website with a list of available options.  The user selects each item by holding down the CTRL key as they select the item or use the SHIFT key and select. 

To create a Multiple Select List in a region, click on the  icon in the Items region on the Page Definition page:

1.       On the Item Type page, select the type Multiselect List and click Next.

2.       On the Display Position and Name page.

  • Item Name: Enter the name of the item.

  • Sequence: Enter the sequence based on where the page item is to be displayed in the region.

  • Region: Select the region in which this page item should be displayed.

  • Click Next.

This is the most important part of the wizard.  This is where the display values and the results are defined for the list.  On this page, a LOV that has already be created and named will be chosen, type in a new SELECT statement or make a Static list.  For the example in Figure 10.25, a static select list was used.

STATIC:Red;R,White;W,Blue;B,Green;G,Purple;P,Yellow;Y

The following is the explanation for some of fields on this page.

  • Named LOV:  Enter the name of the LOV that will provide the values for this select list.

  • Display Null - Option: Choose whether or not to display the fact that the session state for the item is null.

  • Answering YES here will cause the select list to be rendered with an extra item indicating null.  The default text that will be displayed in the select list to indicate null is %.

  • Null Text:  Enter the text to be displayed in the event the session state for the select list is null.  In Figure 10.24, the text Select a Department will be displayed in the select list when a value has not been selected from the list.

  • Null Value:  Enter a value to be used in session state if no item is selected in the select list.  This item can be used in page validations to check if an item has been selected.  It is common to use a -1 for numeric data and an X for character data.

3.       On the Item Attributes page:

  •  Label: Enter the text to display next to the select list.

  • Label Alignment: Choose the position to place the label.

  • Field Width: This is not used for select lists.

  • Field Alignment: Select the position to display the select list in relation to the table cell in which it will be rendered.

  • Label Template: Choose the template to be used for the label.

  • Click Next.

4.       On the Source page:

  • Item Source: Choose the source for where the value is being set from.  It is normal to leave this set to Static Assignment where value equals source attribute.  What that means is when the page is rendered, the selected item will be set to the value corresponding with the session state for the page item. 

  • Default: Enter the value that for the select list.  This should be the same as the Null Value explained above.

  • Click the Create Item button to not set any conditions, or click Next to set them.

5.       On the Cachingpage, select the desired Derive Item Source option.  The default is only when the value is NULL.

6.       Click the Create Item button.

After the item is created, the list may only display that it has one value in size and shown in Figure 10.26.  The reason that it displays this way is because the wizard does not give the option of making it larger.  Thus, the page item should be edited.

First, edit the item by clicking on the item name in the Page definition.  In the definition, there is a section called Element.  This is where the height of the list can be defined.  The height needs to be set to the number of values to show up on the page.  As noted before, if there are more items than what is shown, a scroll bar will be provided so it is not necessary to show all the values at one time.  The width is taken care of automatically, so there is no reason to worry about that.


The above book excerpt is from:

Easy HTML-DB Oracle Application Express

Create Dynamic Web Pages with OAE

ISBN 0-9761573-1-4   

Michael Cunningham & Kent Crotty

http://www.rampant-books.com/book_2005_2_html_db.htm

 

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