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DHTML Lists

A new type of list, the DHTML List, was added in Version 2.0 of HTML DB.  This type of list creates a menu or tree type list.  Many examples of the DHTML Image lists already exist and have likely been seen by the readers.  The icon drop down lists are a DHTML Image list. 

DHMTL Lists are created just like any other list with entries and targets.  DHTML menus also have sublists.  The sublists will appear when the icons are pressed.  Users have seen this action using the HTML DB DHMTL buttons.

If using images, the DHMTL List (Image)with Sublist option must be chosen.  The images must be specified in the Lists that will be used as the source of the List region.  The image can be any image the developer wants to use.  The template has two image specifications: one for the button; and the other for the right side drop down menu.  These specifications can be changed if necessary to add the developer’s own graphics.   It is not necessary to be limited to the button that Oracle has provided.   If one wants to provide their own graphics, simply change the subtemplates in the Template Definition.   The following subtemplates will have to be modified: The List Template Current, List Template Current with Sub List Items, List Template Noncurrent, and List Template Noncurrent with Sub List Items.

The following steps can be used to modify the template:

1.       From the page definition, click on the DHTML List (Image) with Sublist in the Templates box or access this template through the Shared Components.

2.       In the template, look for the Template Definition section as shown in Figure 11.8.

3.       Now modify the templates as desired.  For example, the List Template Current will be equal to the following when installed. 

<div class="dhtmlMenuItem"><a href="#LINK#"><img src="#IMAGE_PREFIX#themes/generic_list.gif" #IMAGE_ATTR# /></a><img src="#IMAGE_PREFIX#themes/generic_open.gif" width="22" height="75" /><a href="#LINK#" class="dhtmlBottom">#TEXT#</a></div>

Careful examination of the HTML code will reveal two references to images.   The first reference is to the left side of the icon drop down, generic_list.gif, the second is the right side of the button, generic_open.gif.   These two images are plain gray boxes, but they do not have to be!   The source of the button image can be changed to whatever the developer wants it to be!   For instance, the src was changed to use the image specified in the List definition.  The Template Definition could be changed to be like the following:

<div class="dhtmlMenuItem"><a href="#LINK#"><img src="#IMAGE#" #IMAGE_ATTR# /></a><img src="#IMAGE_PREFIX#themes/generic_open.gif" width="22" height="75" /><a href="#LINK#" class="dhtmlBottom">#TEXT#</a></div>

The src of the image can be anywhere that you specify.  


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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