RWA_IMAGE_FUNCTION

See Also

Example

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Purpose

Creates an image button for an HTML document that invokes a JavaScript A programming language supported by most web browsers. Client-side JavaScript allows executable content to be included with web pages.  function. Outputs generated code to vText buffer. Up to three images can be specified for display on the button (see also RWA_IMAGE_ANCHOR).

Syntax

RWA_IMAGE_FUNCTION(vString, JSFunction, Description, aImageURLArray, aClass)

Parameters

vString A variable containing the string to which the generated code is appended. On return, the variable contains the modified string. If the string does not exist, it is created.

JSFunction JavaScript function to be called when the image is clicked.

Description Alternative text for the image (the text displayed if the image cannot be displayed).

aImageURLArray
A dynamic array A multi-element string variable in which data is divided into elements by attribute marks, value marks and subvalue marks, matching the structure of a Reality file item. The entire array is referenced and stored as a single variable. For more information, refer to the Reality DataBasic Reference Manual.  containing up to 3 image URLs:

• Element 1 specifies the default URL Uniform Resource Locator - a web address.  for the image.
• Element 2, if specified, is the URL of the image to be displayed when the mouse is over the image.
• Element 3, if specified, is the URL of the image to be displayed when the user clicks on the image.

aClass A dynamic array A multi-element string variable in which data is divided into elements by attribute marks, value marks and subvalue marks, matching the structure of a Reality file item. The entire array is referenced and stored as a single variable. For more information, refer to the Reality DataBasic Reference Manual.  that can contain the following elements:

Element No.	Attribute	Description
1	CLASS	The name of a tag class defined in a CSS Cascading Style Sheet - a mechanism by which the presentation of an HTML page can be separated from the content. A style sheet can be used to determine the appearance of one or more HTML pages.  stylesheet.
2	ALT	Alternative text that is displayed instead of the image, if image display is not possible or disabled by the user. This must be a text string of up to 1024 characters. It can contain entity references to special characters, but cannot contain any other sort of markup; in particular, no style tags are allowed.

Attributes defined in the aClass parameter are applied to the INPUT tag.

For information about using aClass, see The aClass Parameter.