Dynamically select the value of a select item javascript/jquery -

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i have select list of options, , when user selects 1 of options, want dynamically select same option on similar select list on page.

so these 2 lists:

<select id='b_orientation'><option>horizontal</option><option>vertical</option></select>  <select id='orientation'><option>horizontal</option><option>vertical</option></select>

now after user changes b_orientation, want orientation mirror change. relevant line of code that:

$('#orientation').val($('#b_orientation'));

but doesn't make difference orientation. why not?

you forgot mention val()

as of adding element not element's value.

change line 

$('#orientation').val($('#b_orientation').val());

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