Autologin on https with json

Possible Duplicate:
Convert form data to JS object with jQuery

I need to login my users to external website, but there's a problem, this website processes only json-data POST values, ex. {"username":"user","password":"12345"}

<form action="https://external.com/login" method="POST">
<input name="username" value="user" />
<input name="password" value="12345" />
<input type="submit" />
</form>

This above only sends average key=value data, how can I use to POST json-data to external https?

---

Here is a simple jquery example using jQuery.ajax()

HTML:

<form action="https://external.com/login" method="POST" onsubmit="return postJson(this)">
<input name="username" value="user" />
<input name="password" value="12345" />
<input type="submit" />
</form>

JQ:

function postJson(form) {
    var action = $(form).attr('action');
    var user = $('[name="username"]', form).val();
    var pass = $('[name="password"]', form).val();

    console.log('action=' + action + ', user=' + user + ', pass=' + pass);

    $.ajax({
        url: action,
        type: 'POST',
        data: JSON.stringify({ username: user, password: pass }),
        success: function(data, status) {
            // do something after login
            console.log('success');
        },
        error: function() {
            console.log('error');
        }
    });

    return false;
}

JSFiddle

链接地址: http://www.djcxy.com/p/46340.html

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