Grab value of hidden input and assign to another input's value

I have an h开发者_JAVA百科idden input:

 <input type="hidden" id="hidden" /> 

 $('#hidden').before('<input type="text" id="mhidden" alt="decimal" value="" />');
 var val = $('#hidden').val();
 $('#mhidden').val(val);

In <input type="text" id="mhidden" alt="decimal" value="" /> the value is empty in html but with alert($('#mhidden').val(val)); has a value. Why the value of #mhidden is empty? I want to assign hidden input's value to #mhidden.

Thanks in advance

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alert($('#mhidden').val(val));

This passes the value of the val variable to the val() function. This function acts as a getter/setter depending on whether a parameter is passed or not. What is being alerted is the return value for the setter version, which will be the jQuery object for $('#mhidden').

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you want to add the value of hidden to mhidden in html you can try this

var val = $('#hidden').val();
$('#hidden').before('<input type="text" id="mhidden" alt="decimal" value='+val+' />');