How to submit form on change of dropdown list?

I am creating a page in JSP where I have a dropdown list and once the user selects a value he has to click on the go button and then the value is sent to the Servlet.

            </select>
            <input type="submit" name="GO" value="Go"/>

How do I make it so that it does it on change? E.g. when the user selects John all his details are retrived from the DB and displayed. I want the system to do it without having to click the go button.

Solution 1:

Just ask assistance of JavaScript.

<select onchange="this.form.submit()">
    ...
</select>

See also:

• HTML dog - JavaScript tutorial

Solution 2:

Simple JavaScript will do -

<form action="myservlet.do" method="POST">
    <select name="myselect" id="myselect" onchange="this.form.submit()">
        <option value="1">One</option>
        <option value="2">Two</option>
        <option value="3">Three</option>
        <option value="4">Four</option>
    </select>
</form>

Here is a link for a good javascript tutorial.

Solution 3:

other than using this.form.submit() you also submiting by id or name. example i have form like this : <form action="" name="PostName" id="IdName">

1. By Name : <select onchange="PostName.submit()">

2. By Id : <select onchange="IdName.submit()">

Solution 4:

To those in the answer above. It's definitely JavaScript. It's just inline.

BTW the jQuery equivalent if you want to apply to all selects:

$('form select').on('change', function(){
    $(this).closest('form').submit();
});