Optimize jQuery Function

It's possible to optimize and minify this sample function? How could I do it?

$(function () {
    $("#options").change(function () {
        var message_index = $("#options").val();
        if (message_index == 0) {

            $("#display_image").show();
            $("#display_flash, #display_youtube, #display_google").hide();

        } else if (message_index == 1) {

            $("#display_flash").show();
            $("#display_image, #display_youtube, #display_google").hide();

        } else if (message_index == 2) {

            $("#display_youtube").show();
            $("#display_image, #display_flash, #display_google").hide();

        } else if (message_index == 3) {

            $("#display_google").show();
            $("#display_image, #display_flash, #display_youtube").hide();

        } els开发者_JS百科e {

            $("#display_image, #display_flash, #display_youtube, #display_google").hide();

        }

    });

});

$(function () {

    var $displays = $("#display_flash, #display_youtube, #display_google, #display_image"),
        toShow = ['image','flash','youtube','google'];
    $("#options").change(function () {
        $displays.hide();
        $("#display_"+toShow[$(this).val()]).show();
    });

});

Not really much optimisation, but certainly cleaner IMO:

$(function () {
    $("#options").change(function () {
        // hide everything
        $("#display_image, #display_flash, #display_youtube, #display_google").hide();

        switch ($("#options").val()) {
            case 0:
                $("#display_image").show();
                break;
            case 1:
                $("#display_flash").show();
                break;
            case 2:
                $("#display_youtube").show();
                break;
            case 3:
                $("#display_google").show();
                break;
        }
    });

});

To minify, use http://jscompress.com/

If you want to minify that code, try putting it into here - http://www.minifyjavascript.com/

With your current code, you could do something like this:

$("#options").change(function () {
    var message_index = $("#options").val();
    var elemIds=[
        '#display_image', 
        '#display_flash', 
        '#display_youtube', 
        '#display_google'];
    $(elemIds.join(',')).hide();
    if (elemIds[message_index]) {
        $(elemIds[message_index]).show();
    }
});

You haven't provided the markup you're running this on, even further optimizations would be possible based on that. Maybe adding a common class for those showable elements. If the elements are in the right order in the markup (same as the message_index order), you can go even further with optimizations.

For minification, there are several tools to use, the others have provided you some.

You can get ideas from:

Minify jQuery based js files

How to minify jquery files?

replace your if statement with a switch statement