Simple jQuery function that changes an <a> element to an <input> for copying the href contents.

jquery.copylink.js

// USE: <a href="http://yoursite.com/" rel="copylink">yoursite.com</a>

$(document).ready(function () {
    $(window).on("click", "a[rel=copylink]", function (e) {
        e.preventDefault();
        var href = $(this).prop("href"),
            txt = $(this).text();
        $(this).hide().parent().html('<input type="text" value="' + href + '" data-href="' + href + '" data-txt="' + txt + '" width="20" class="copyinput">');
        $(".copyinput").focus().select()
    }).on("blur", ".copyinput", function () {
        var href = $(this).data('href'),
            txt = $(this).data('txt');
        $(this).hide().parent().html('<a href="' + href + '" rel="copylink">' + txt + "</a>")
    })
});