action on hovered text

script.js

var getSelectedText = function() {
        var text = '';
        if (window.getSelection) {
            text = window.getSelection().toString();
        } else if (document.selection) {
            text = document.selection.createRange().text;
        }
        return text;
    };

$('.should-highlit').on('mouseup', function(){
    var text = getSelectedText();
    if (text != ''){
        alert('find and wrap it');
    }
});