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Problem Solution You want to overlay an image with clickable areas that link to other pages You can link an image to a map element that defines clickable areas and associates each area with a URL When a user clicks an area, a browser jumps to its associated link You can add a usemap attribute to an image to link the image to the map element with the same value in its name attribute Multiple images can be linked to the same map element For easy access to the element through JavaScript, it is a good practice for map elements to have an id attribute with the same value as its name attribute A map element contains one or more area elements Each area defines a region of an image that can be clicked.

Areas should not overlap, but if they do, the document order of area elements determines the stacking order Each area has four required attributes: href, alt, shape, and coords href is the URL of the link that a browser jumps to when a user clicks the area alt is read by screen readers to describe the link it is not visible shape is the shape of the area, which is one of three shapes: rect, circle, and poly coords define the location and extent of the shape The number and meaning of coordinates in coords varies with each type of shape Rectangles require four comma-delimited numbers The first two are x, y coordinates of the upper-left corner of the rectangle, and the second two are x, y coordinates of the lower-right corner Circles require three comma-delimited numbers.

The actual filtering of content is a two-step process. First, filters are allowed to prepare text for processing. The main goal of this step is to convert HTML to corresponding entities. For example, take a filter that allows users to paste code snippets. The prepare step would convert this code to HTML entities to prevent the filters that follow from detecting and interpreting the tags. The HTML filter would strip out this HTML if it weren t for this step. Here s an example of using prepare from codefilter.module, a module that handles <code></code> and < php > tags, to let users post code without having to worry about escaping HTML entities: case 'prepare': // Note: we use the bytes 0xFE and 0xFF to replace < > during the // filtering process. // These bytes are not valid in UTF-8 data and thus least likely to // cause problems. $text = preg_replace('@<code>(.+ )</code>@se', "'\xFEcode\xFF'. codefilter_escape('\\1') .'\xFE/code\xFF'", $text); $text = preg_replace('@[\[<](\ php|%)(.+ )(\ |%)[\]>]@se', "'\xFEphp\xFF'. codefilter_escape('\\2') .'\xFE/php\xFF'", $text); return $text;

s Did you know that you can test loops from within the Immediate window Just type them using the Tip following syntax:

The first two are x, y coordinates of the circle s center, and the third is its radius Polygons require a series of comma-delimited numbers in pairs of x, y coordinates that define the points of the polygon This design pattern does not use any CSS styles Pattern HTML <img usemap="MAP_NAME" src="FILEEXT" width="WIDTH" height="HEIGHT" alt="DESCRIPTION" /> <map name="MAP_NAME" id="MAP_NAME"> <area href="URL" shape="RECT_CIRCLE_POLY" coords="x,y.." alt="SCREENREADER_DESCRIPTION" /> </map> Location Tip This pattern applies to images and image maps Image maps work well when you want a user to explore something visual, such as a real-world map The problem is that image maps are invisible Other than the mouse pointer changing shape when it is over a clickable area, a user cannot tell where areas are located, how many areas there are, and which areas have already been visited.

For this reason, image maps are often paired with redundant links that are absolutely positioned over the image These links make it clear what is clickable and what has already been visited The example at the end of the chapter shows how this works Image, Content over Image, Content over Background Image wwwcssdesignpatternscom/image-map.

The result of running this is shown in Figure 7-26.

The results from the prepare step are passed back through hook_filter(). It s here that the actual text manipulation takes place: converting URLs to clickable links, removing bad words, adding word definitions, and so on. The prepare and process steps should always return $text.