How use keyboard arrow keys to move a div 100px left/right respectively

I have a div with an id of bottom_arrow and I want to use my keyboard arrows left/right to mo开发者_如何学Pythonve the div left and right 100px. How can I do this?

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As a rule keypress events go to an input or some control that has focus, if you need them generally on a page, which is a sometimes a little frowned upon due to removing standard behavior, then bind the keydown event to the whole document.

$('body').keydown(function(event) {
    switch (event.keycode) {
        case 37: // left arrow key
           $('#bottom_arrow').animate({ 'left': '-=100' });
           break;
        case 39: // right arrow key
           $('#bottom_arrow').animate({ 'left': '+=100' });
           break;
    }
});

I have used keydown, rather than keypress as a user would expect it to trigger whilst pressing the key.

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$('body').keydown(function(event) {
    switch (event.keycode) {
        case 37: // left arrow key
           $('#bottom_arrow').animate({ 'left': '-=100' });
           break;
        case 39: // right arrow key
           $('#bottom_arrow').animate({ 'left': '+=100' });
           break;
    }
});

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According to Jquery documentation, use event.which instead.

$('body').keydown(function(event) {
    switch (event.which) {
        case 37: // left arrow key
            $('#bottom_arrow').animate({ 'left': '-=100' });
            break;
            case 39: // right arrow key
            $('#bottom_arrow').animate({ 'left': '+=100' });
            break;
    }
});