# Nested observe\_field and IE

**URL:** <https://www.ruby-forum.com/t/nested-observe-field-and-ie/148405>\
**Category:** Rails\
**Created:** [September 12, 2008, 3:40pm UTC](https://www.ruby-forum.com/t/nested-observe-field-and-ie/148405 "2008-09-12T15:40:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![1w4n](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/1/65b543/32.png) [@1w4n](https://www.ruby-forum.com/u/1w4n)\
**Post date:** [September 12, 2008, 3:40pm UTC](https://www.ruby-forum.com/t/nested-observe-field-and-ie/148405/1 "2008-09-12T15:40:47Z")

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Hello,  
Inside a view i have a list of nations, the drop-down is “observed” and  
at any modification of this list an other nested list (with a regions  
list) will be updated, that is itself observed and that update an other  
nested list of provinces.  
When i modify the nation at the beginning the regions and provinces are  
correctly updated, but when the region is automatically updatet its  
modification will be revealed by its observer and that read a “null”  
value (as a string) and an error will be generated.  
This happened ONLY using Internet Explorer, not using Firefox or Safari.

Any idea?  
Thanks!

Iwan

Sorry for my poor english 🙂