How to use onchange event in hbs file ?

Hi There, 

I have two drop down list in hbs template.  I have to show the 2nd drop down options based on selection of 1st drop down. For ex: my 1st drop down is state and 2nd is city, On selection of state , city dropdown options should list based on the state we selected. 

I have no idea how to use onchange menthod in hbs file. Anyone please suggest me any way ? 

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