Openui5: Expression Binding: logical operator && not working

[chumbalum]

OpenUI5 version: 1.38.5

Browser/version (+device/version): Chrome 51

Any other tested browsers/devices(OK/FAIL): FAIL

Steps to reproduce the problem:

• Basic UI5 Projekt with Complex Binding
• Following will work
  
  
  
  • <Button text="Test" visible="{= true || true }" />
  
  
• Following will fail
  
  
  
  • <Button text="Test" visible="{= true && true }" />
  
  

What is the expected result?

• The calculated value should be true

What happens instead?

• No view is displayed.
• Check for 'file not found' or parse errors. Reason: Error: Invalid XML

Any other information? (attach screenshot if possible)

• The examples are simple to show the issue. The && operator won't work with more complex expressions, neither.
• Plunker project to test that issue:
  
  
  
  • https://embed.plnkr.co/dbCYl3MjpB70bEt5vTue/
  
  

[cschuff]

I faced this problem, too, and was able to solve it by escaping '&' as XML-Entity '&&'

So this should work:
<Button text="Test" visible="{= true &amp;&amp; true }" />

Updated Plunker here: https://plnkr.co/edit/nCJm9bXTqkOo7vgHkKCf?p=preview

[ThomasChadzelek]

That's true. Not sure whether our documentation was helpful here. On https://sapui5.hana.ondemand.com/#docs/guide/daf6852a04b44d118963968a1239d2c0.html it says (somewhere) "Some characters that are used by operators, however, need to be escaped in XML, for example the left angle bracket (<) and the ampersand (&)."

[chumbalum]

Ah ok. Thank you for that hints. Didn't notice that information in the documentation in the first place. So I think this issue can be closed.

Greetings,
chumbalum