keyboard navigation with arrow keys (next and back) for changing filenames

Question

I have a bunch of html files with different file-names, that I need to add an option to use keyboard arrow keys to navigate (previous and next file).

The file-names are

Answer 1

If you were to define two ID's on two <a> tags like so:

<a id="prev" href="filename.html">prev</a>
<a id="next" href="thirdone.html">next</a>

You could do something like this in navigation.js and include it from every page:

// when the document is ready, run this function
jQuery(function( $ ) {
    var keymap = {};

    // LEFT
    keymap[ 37 ] = "#prev";
    // RIGHT
    keymap[ 39 ] = "#next";

    $( document ).on( "keyup", function(event) {
        var href,
            selector = keymap[ event.which ];
        // if the key pressed was in our map, check for the href
        if ( selector ) {
            href = $( selector ).attr( "href" );
            if ( href ) {
                // navigate where the link points
                window.location = href;
            }
        }
    });
});

You could even use a little CSS to make the #prev, #next { display: none; } or play around with absolutely positioned CSS triangles.