Javascript - strikethrough

Question

i try to make text strikethrough with javascript. I know nothing about Javascript and try to search on the net how to that.

 <script language="JavaScript">
            function recal(val,sum)
            { 
                if(sum == true)
                {
                    var total = parseInt(document.getElementById("total").innerHTML, 10);
                    total+=val;
                    document.getElementById("total").innerHTML=total;        
                }
                else
                {
                    var total = parseInt(document.getElementById("total").innerHTML, 10);
                    total-=val;
                    document.getElementById("total").innerHTML=total;   
                    var pnl = document.getElementById("totalEvents");
                }



                var pnl = document.getElementById("totalEvents");
                var pnl2 = document.getElementById("eventCategory");
                var pnl3 = document.getElementById("nameID");

                **strikethrough starts here**
                if (!sum && pnl.firstChild.tagName != "S" && pnl2.firstChild.tagname !="S")
                {
                    pnl.innerHTML = "<S>"+ pnl.innerHTML+"</S>";
                    pnl2.innerHTML = "<S>"+ pnl2.innerHTML+"</S>";
                }
                else 
                {
                    pnl.innerHTML = pnl.firstChild.innerHTML;
                    pnl2.innerHTML = pnl2.firstChild.innerHTML;
                }



            }
        </script>

it makes textstrikethrough but something is wrong. Even if i choose second checkbox it affects first checkbox why :(

http://jsfiddle.net/aHH9w/ (my full html page)

Answer 1

You are peforming a pretty convoluted way of achieving this, something that can actually be quite easily done. If you have an HTML element, say with the id 'myelement':

<div id="myelement">Hello world</div>

To create a strikethrough, all you need to do in JS is:

var ele = document.getElementById("myelement");
ele.style.setProperty("text-decoration", "line-through");

If you need to check if there is a strikethrough on an element:

var ele = document.getElementById("myelement");
var isStruck = (ele.style.getProperty("text-decoration") == "line-through");

Although this is not really recommended. Use an internal variable to keep track of state.