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LightSwitch: Passing Data Between Screens - Example 4: Passing a Database Item without JavaScript

For other posts in this series, see our series list.

In our last example, we passed data from one screen to another using a bit of JavaScript. However there is two issues:

  • If you do not select an item before clicking the button – it errors
  • It needs code, and LightSwitch is about making the drudge work easier so how can it help here?

This posts, and the rest in the series will be a bit shorter as we are covering the same theme but applied in different ways – so make sure you read the preceding parts or you may feel a bit lost.

As with each part of this series, the code can be found on GitHub.

Example 4: Passing a database item without JavaScript

1. On the BrowseAnimals screen we already have, we once again add a button to the screen in the command bar with the following properties:

  • Choose an existing method: showWeasel
  • data: AnimalsSet.selectedItem.Name

What we are doing here, is having the Weasel screen shown & because we added a parameter we can use the build in tools to set that parameter to a data item on the screen.

image

(in the above image the parameter is labelled myData – for our example it will be data).

This is it! It is far simpler than example 3, it also doesn’t have the issues we mentioned at the start – so you should always use this option if you can.

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