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You've changed visibility, you've changed the contents, and you've dragged layers around. However, those are only a few of the layer properties you can control. Depending on which browser(s) you're scripting for, you can change background color , position, width and height, style, and clippingyou name it. The Dreamweaver general, all-purpose behavior for controlling everything not covered by other behaviors is Change Property.
This behavior isn't just for changing layer properties. It's more of a catchall behavior for changing any property of any scriptable page element. Depending on the browser you're targeting and the DOM it supports (see the discussion on DOMs at the beginning of this chapter), you can change properties for form elements, various kinds of layers, and even images. Figure 14.28 shows the Change Property dialog box with its various parts identified. (See Chapter 9, "Working with Forms," for a discussion of using this behavior with form elements.)
To use Change Property to alter layer properties, follow these steps:
Because it's a generic behavior with a very basic purpose, Change Property does not necessarily create cross-browser scripts. After you choose a target browser in the dialog box, the script will be entered using the syntax required for that browser. If all you're doing with the behavior is scripting form fields, your script will probably work across browsers because only basic DOM access is required for this kind of page element. If you're scripting layers, your behavior will definitely be browser-specific.
As discussed in Chapter 13, "Interactivity with Behaviors," Netscape 4. x functions best if its proprietary <layer> tag is used to create layers, even though layers created with other tags will work there. If you target Netscape 4 in the Change Property behavior and specify that you want to change <div> layers, no scriptable properties will show up in the dialog box. If you choose the <layer> tag to change, however, you'll still be allowed to choose named instances of <div> layers, and the property list will supply a list of Netscape-formatted properties to change. Figure 14.29 shows this strange occurrence in action. This configuration will work fine in Netscape 4 or Netscape 6.
For some properties, it is possible to target IE and Netscape Navigator just by attaching two instances of Change Property to the same event handler. Figure 14.30 shows two separate configurations of the behavior, each set to change the vertical position of the specified layer on the page. Both behaviors are being applied to one text link, to be activated by onClick . This strategy won't work with all properties. If you attempt to change the layer's background color in this way, for instance, IE interprets the Netscape syntax as a command to change the page's background color.
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