unable to edit css with javascript

Question

I am trying to edit my form with these simple

testings:

<span id="a">30 <span id="aa" style="display:none;"><input type="text" id="aa" name="q"/></span></span>
<span id="cq"><a href="javascript:changeQty()">Change</a></span>
<span id="cq2" style="display:none"><a href="javascript:save()">save</a></span>

<script>
  function changeQty(){
    document.getElementById("a").style.display="hidden";
    document.getElementById("aa").style.display="inline";
    document.getElementById("cq").style.display="hidden";
    document.getElementById("cq2").style.display="inline";
  }
</script>

But strangely,my attempt to hide the fields are not working. But I can view the hidden fields when I click on Change link. Whats wrong I am doing ?

Answer 1

There is no hidden attribute for display , you need to use none .

function changeQty(){
  document.getElementById("a").style.display="none";
  document.getElementById("aa").style.display="inline";
  document.getElementById("cq").style.display="none";
  document.getElementById("cq2").style.display="inline";
}

Answer 2

You have done two very simple mistake

1. At javascript use vale "none" for display style attribute for hidden a element

2. The element "aa" is the child element of element "a". so when you use
   document.getElementById("a").style.display="none"; also hides the element "aa"

so the final solution you may desire is as follows

<span id="a">30</span>
<span id="aa" style="display:none;"><input type="text" id="aa" name="q"/></span>
<span id="cq"><a href="javascript:changeQty()">Change</a></span>
<span id="cq2" style="display:none"><a href="javascript:save()">save</a></span>

<script>
  function changeQty() {
    document.getElementById("a").style.display="none";
    document.getElementById("aa").style.display="inline";
    document.getElementById("cq").style.display="none";
    document.getElementById("cq2").style.display="inline";
   }
</script>