php - Magento: Change the text box value onchange of select box in system.xml of custom magento extension -


please me out of trouble facing. have added select box sftp host values production , sandbox in system.xml file of custom extenstion. there 1 text field sftp port in system.xml. want set text field value on change of select box.

for example, if select option production port value in text box should appear 22, if select sandbox port value = 21

my system.xml is

<ftphost translate="label">     <label>sftp host</label>     <frontend_type>select</frontend_type>     <source_model>gb/system_config_source_sftp</source_model>     <sort_order>60</sort_order>     <show_in_default>1</show_in_default>     <show_in_website>1</show_in_website>     <show_in_store>1</show_in_store> </ftphost> <ftpport translate="label">      <label>sftp port</label>      <frontend_type>text</frontend_type>      <sort_order>70</sort_order>      <show_in_default>1</show_in_default>      <show_in_website>1</show_in_website>      <show_in_store>1</show_in_store> </ftpport>


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