Archived:Displaying Multi-Line Strings in Data Dashboard for LabVIEW on iPad

Updated Dec 18, 2023

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This content provides support for older products and technology, so you may notice outdated links or obsolete information about operating systems or other relevant products.

Reported In

Software

  • Data Dashboard for LabVIEW
  • LabVIEW

Operating System

  • iOS

Issue Details

I’m working with the Data Dashboard for LabVIEW on iPad but can’t seem to get multi-line text to display correctly:

Is there a solution or workaround for this? I’d like to display a number of lines of text to the user without having to split it down per line and separate variables.

Solution

Note: NI is no longer updating Data Dashboard and the Data Dashboard download is no longer available on the App Store nor Google Play. Consider using WebVIs for your LabVIEW-based web application needs.

Data Dashboard for Apple iPad does indeed show multi-line strings as a single line. It converts line-breaks into white spaces.

However, there is a workaround to create an indicator that can display multi-line strings on a Dashboard on the iPad Data Dashboard app. Follow these steps to do so:
  1. Convert the multi-line string into an array of strings in your VI.
  1. Assign this array to a network-published variable. The type of this variable shall be array of strings as well.
  1. On your iPad create a List Box indicator on your Data Dashboard.
  2. Connect the "Item Strings" property of this List Box indicator to the shared variable.
This screenshot shows both a normal string indicator and a multi-line List Box:

Additional Information

The following code is an example showing one way to convert an already-existing multi-line string into an array of strings. This example makes use of the Multi-line String to Array.vi, which is part of the Third-Party Add-On "OpenG String Library" by OpenG.org. It can be installed either using VI Package Manager or by downloading and installing the the OpenG Libraries package available on NI's Tools Network.


Note: Currently Multi-line String to Array.vi detects line breaks in the three representations Line Feed (LF), Carrier Return (CR), and CR+LF, respectively \n, \r, and \r\n.

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