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dynamic drop down population


chiprivers

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I want to be able to create a form containing two drop down select boxes where the options in the second dropdown are dependent on the selection made in the first drop down.

 

I can see that this is quite a common query but I want to be able to do this without reloading the page or using AJAX or similar.  I understand that this should be possible by loading all the required options into a set of arrays or one multidimensional array and populate the second dropdown using javascript. 

 

I have googled and googled but keep coming up with methods that are not suitable, please could somebody walk me through the basics or direct me to a tutorial that will show mehow to do this using purely javascript?

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