Manual Kompozer 07 (page 30 of 58) (English)

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KompoZer User Guide — 17 December 2007 Based on version 0.7.10 30

4.5.2 Styles within a div

A div is a useful way of applying a different set of

styles within a limited region on a page. Of course a set

of classes could be designed and applied to the ele-

ments within the region but this is laborious and bloats

the code. A simpler way is to establish a set of styles for

the elements in the div and to tag them in such a way

that they apply only within the div. This is done using

an appropriate selector. Suppose the div has a class

‘divclas’. Examples of appropriate selectors are:

div.divclas p

div.divclas td

div.divclas a:visited

Or when using ids

#menu p

#contents li

These may be set up in the same way as for pseudo-

classes see section 4.2.5.2.

4.5.3 Creating a layer using a div

In section 3.10.3 we noted that 'Layers' are con-

tained in 'divs'. In fact a layer is simply a div which has

a position, and optionally a z-index, style attached.

When KompoZer creates a layer it does so by attaching

an inline style to the div.

It is equally possible to create a layer by setting up

an appropriate class and attaching this to a div.

When a layer is created in this way KompoZer

depicts it as a normal layer and renders it with a

surrounding box with sizing and position handles.

Visually it is indistinguishable from any other layer.

Such layers may, of course be precisely located and

are not subject to the vagaries of manual dragging.

Warning If a layer, created using a class, is

subsequently dragged or resized, KompoZer at-

taches an inline style. Any styling so added will

override the class styling.

5 Scripts

Scripts are short programs that are included in

HTML documents (and consist of alphanumeric and

other characters) which can change the presentation

of pages in some way. Scripts must be written in an

appropriate script language but this does not form

part of the HTML specification. Support for scripting

language depends on the browser and/or server em-

ployed.

The most common scripting language is probably

JavaScript. It runs on the browser and most modern

browsers provide support but this can sometimes be

disabled if desired by the visitor.

Another common script is PHP. This runs on and

depends on support provided by the server. When

including PHP code authors should use the fuller tags

e.g. <? php ... ?> and not the short tags <? ... ?> which

KompoZer does not support.

KompoZer allows the use of scripts on pages but

does not respond to them. The effect of the script will

not be seen on the Normal, HTML Tags or Preview view

(but the code will of course appear in Source view).

To see the code at work click on ‘Browse’.

Note Some scripts include ‘special characters’

which, when encoded by KompoZer, result in

errors when the script runs. To avoid this, in

Tools > Preferences > Advanced, check the box

‘Don’t encode special characters in attribute

values’. You can find more in formation about

this in Appendix 6

In the menu there is a command Tools > JavaScript

Console - This Guide does not cover this.

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