CODEWITHSUNDEEP
javascripthtmlcssonmouseoveronmousedown
Gwen Wong
Gwen Wong

Reputation: 357

How to display items of a particular div on mouseover

I have the div structure

<div id="navigate">
   <div class="menu">
       <div class="group">Mail</div>
       <div class="item">Folders</div>
       <div class="item">Messages</div>
   </div>
   <div class="menu">
       <div class="group">Contacts</div>
       <div class="item">Friends</div>
       <div class="item">Work</div>
   </div>
   <div class="menu">
       <div class="group">Setting</div>
       <div class="item">General</div>
       <div class="item">Account</div>
   </div>
</div>

Right now all items are hidden, and only divs with class 'group' is shown. What I would like to do is if I mouse over a specific menu div, only items of that menu would appear.

Right now I have this code:

function initialise()
{
    hideAllItems();

    setMouseOvers();
}

function hideAllItems()
{
    var nav = document.getElementById("navigate");
    var items = nav.getElementsByClassName("item");

    for(var i = 0; i < items.length; i++)
    {
        items[i].style.visibility = "hidden";
        items[i].style.display = "none";
    }
}

function setMouseOvers()
{
    var nav = document.getElementById("navigate");
    var menuArr = nav.getElementsByClassName("menu");

    for(var x = 0; x < menuArr.length; x++)
    {
        var itemArrs = menuArr[x].getElementsByClassName("item");

        /*var show = function(){ show(itemArrs); };
        var hide = function(){ hide(itemArrs); };*/
        menuArr[x].onmouseover=function(){ show(itemArrs); };
        menuArr[x].onmouseout=function(){ hide(itemArrs); };
    }
}

function show(itemArr)
{
    for(var i = 0; i < itemArr.length; i++)
    {
        alert(itemArr[i].innerHTML);
        itemArr[i].style.visibility = "visible";
        itemArr[i].style.display = "block";
    }
}

function hide(itemArr)
{
    for(var i = 0; i < itemArr.length; i++)
    {
        itemArr[i].style.visibility = "hidden";
        itemArr[i].style.display = "none";
    }
}

And this works, thought it only displays General and Account no matter which menu I hover over. I vaguely understand whats going wrong, but I can't see anyway to fix it. Any ideas? I do not want to change the html structure (e.g. add ids, or create specific classes) if i can help it!

Upvotes: 0

Views: 2812

Answers (3)

M.S.
M.S.

Reputation: 441

As you ask for an JavaScript Only solution (no change in HTML/css) i suggest the following:
The problem is using "itemArrs" in an anonymous function, as only the latest written "itemArrs" is used for all of them, use "this" instead.

for example:

...
groups[x].onmouseover=function(){ show(this); };
...

and

function show(item) {
  var items = item.parentNode.getElementsByClassName("item");
  ...

A complete JS-only solution that works can be found here: http://jsfiddle.net/Wn4d4/3/

Upvotes: 0

Roko C. Buljan
Roko C. Buljan

Reputation: 206268

Why not simply using CSS: DEMO

.menu .item{
  display:none;
}

.menu:hover .item{
  display:block;
}

Upvotes: 2

Sebsemillia
Sebsemillia

Reputation: 9486

I know that you most probably are looking for a javascript solution, but you could use a simple CSS solution:

.group:hover ~ .item {
    display: block;
}

Working Fiddle

But be aware that it is not supported by older IE (< 8) browsers SUPPORT. It depends on your target group if you want to use it.

Upvotes: 3

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