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#### A.10.1.22 View Datalink Table

Configuration for View Datalink Table action

The View Datalink Table action is for tables with a column containing URLs that point to files in the {links}-response table format defined by the DataLink standard. Activating a row with this action defined will retrieve the DataLink file from the given URL and display it in a new popup window. The display is the same as that of the DataLink Window; see the documentation of that window for details. There are a couple of differences however:

- In this case, the DataLink table has not been loaded into TOPCAT as a new table.
- There is an extra checkbox, Auto-Invoke, next to the Invoke button. If this is selected, then as soon as the row is activated, the invoke action will be performed automatically on that row's DataLink table without needing any more user intervention. This can work well, and reduces the number of clicks required (it's not necessary to hit Invoke every time), but it may be worth trying it manually on a few rows to make sure the right action is taking place. TOPCAT tries to use the corresponding row of the DataLink table each time a new DataLink table is loaded, based on column values; it usually guesses correctly, but may get confused if the structure of the tables is much different for different rows.

Configuration:

Datalink Location
  Gives the URL or filename of the DataLink table for each row. This is normally one of the table columns and can be selectd from the drop-down list, but alternatively the expression language may be used to assemble a location string from other columns.

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk