Question

When i select some data from my option i need the value to be showed when “onchange” the select… can someone help me ?

<select name="search_school" id="search_school" onchange="$('#search_school').val() = $('#school_name').val()">

I want the selected option value to be showed in the hidden input

<input type="hidden" name="school_name" id="school_name" value="" />

Answer 1

I think you want this as your onchange event:

<select name="search_school" id="search_school" onchange="$('#school_name').val($('#search_school').val())">

When you call val() without a parameter, it fetches the value of the element. If you call it with a parameter like val('some value');, it sets the value of the element.