Javascript selected text highlighting prob

Question

I have a html page with text content. On selecting any text and pressing the highlight button, I can change the style of the selected text to highlight the same. To implement th

Answer 1

if (window.getSelection) {
                var sel = window.getSelection();
                if (!sel) {
                    return;
                }
                var range = sel.getRangeAt(0);
                var start = range.startContainer;
                var end = range.endContainer;
                var commonAncestor = range.commonAncestorContainer;
                var nodes = [];
                var node;

                for (node = start.parentNode; node; node = node.parentNode){
                   var tempStr=node.nodeValue;
                   if(node.nodeValue!=null &&    tempStr.replace(/^\s+|\s+$/gm,'')!='')
                     nodes.push(node);
                   if (node == commonAncestor)
                     break;
                }
                nodes.reverse();

                for (node = start; node; node = getNextNode(node)){
                   var tempStr=node.nodeValue;
                   if(node.nodeValue!=null &&  tempStr.replace(/^\s+|\s+$/gm,'')!='')
                     nodes.push(node);
                   if (node == end)
                    break;
                }

                for(var i=0 ; i