rsb:first

The rsb:first keyword is used to execute a section of a script for only the first iteration of an rsb:call or rsb:enum keyword. It is a convenient way to generate headings or to inspect the first item of a feed before going through the rest of the feed.

During the first iteration, the rsb:first body executes before any other code within the rsb:call or rsb:enum, regardless of where the rsb:first is located within the rsb:call or rsb:enum body. It is a good practice to locate the rsb:first at the top of the rsb:call or rsb:enum body as a reminder of this behavior.

Parameters:

• This keyword does not have any parameters.

Control Attributes:

• This keyword does not have any control attribute.

Examples:

The following example creates an HTML table from a feed where each item is represented as a row.

<rsb:call op="listCustomers">
    <rsb:first>
        <table>
        <thead>
            <rsb:enum item="customer">
                <td>[_attr]</td>
            </rsb:enum>
        </thead>
    </rsb:first>
    <tr>
        <rsb:enum item="customer">
            <td>[_value]</td>
        </rsb:enum>
    </tr>
    <rsb:last>
    </table>
</rsb:last>
</rsb:call>

See Also:

• rsb:last: To learn how to include a block of keywords that are executed after all the items have been executed, and only if rsb:first was executed.