##### 32.9.1.1 Assigning alternate text to an image-map hotspot

To provide alternate text for a hotspot in an image map, assign the text to the destination of the hotspot link. For example:

    [GraphALT]
    ; destination or GraphicID#dest or URL dest = desired alt text
    ; a URL destination is the last part of the URL without extension
    ;  ch01f853#RFstage = Tuner first stage
    ;  IFstage = Intermediate Frequency stage

The text you assign becomes the content of the alt attribute of the hotspot <area> tag, unless you tell DITA2Go to use the title attribute instead; see §32.9.1.2 Using the title attribute for alternate text for a hotspot.

The destination ID must be one of the following, depending on the type of link:

Type of link | Form of destination ID
Link via HyperLink: | Base name of the destination HTML file, if the hotspot link is a HyperLink PI marker
Link via HyperJump: | HyperAnchor PI marker content, if the hotspot link is a HyperJump PI marker
Multiple links: | GraphicID followed by # followed by destination ID (one of the other two), to distinguish among multiple links to the same destination

Link via HyperLink

Suppose you use a HyperLink PI marker for an image-map link, with the following marker content:

    <?dthtm HyperLink="http://www.chezmoi.com/mylife.htm" ?>

You would assign alternate text for the hotspot to destination identifier mylife, which is the target file name (without path or extension):

    [GraphALT
    mylife = alternate text for hotspot

However, if the HyperLink PI marker content looks like this:

    <?dthtm HyperLink="http://www.chezmoi.com/mylife.htm#siblings" ?>

You would assign alternate text as follows:

    [GraphALT
    mylife#siblings = alternate text for hotspot

Link via HyperJump

Suppose your image-map link is a HyperJump PI marker, with a destination in the same document; for example:

    <?dthtm HyperJump="awards.dita:firstplace" ?>

You would assign alternate text for the hotspot to destination identifier firstplace, which is the target HyperAnchor PI marker content:

    [GraphALT
    firstplace = alternate text for hotspot

Multiple links

If you have several graphics with image-map links that all point to the same destination, and you want different alternate text for one of them, prefix the destination identifier with the file name of the graphic (no extension) and a #. For example:

    [GraphALT
    ab34e651#firstplace = different alternate text for hotspot

Previous Topic: 32.9.1 Providing alternate text for a hotspot in an image map

Next Topic: 32.9.1.2 Using the title attribute for alternate text for a hotspot

Parent Topic: 32.9.1 Providing alternate text for a hotspot in an image map

Sibling Topics:

32.9.1.2 Using the title attribute for alternate text for a hotspot