jQuery form serialize – empty string

You have to give the input element a name. E.g.:

<form id="form1" action="/Home/Test1" method="post" name="down">
    <div id="div2">
        <input id="input1" type="text" value="2" name="foo"/>
    </div>    
</form>

will give you in the alert box foo=2.

.serialize() takes the name and the value of the form fields and creates a string like name1=value1&name2=value2. Without a name it cannot create such a string.

Note that name is something different than id. Your form also would have not worked if you used it in the “normal” way. Every form field needs a name.