Change background color on mouseover and remove it after mouseout

Question

I have table which class is forum. My jquery code:

<script type="text/javascript">
    $(document).ready(function() {
        $('.forum').bind("mouseover", function(){
            var color  = $(this).css("background-color");

            $(this).css("background", "#380606");

            $(this).bind("mouseout", function(){
                $(this).css("background", color);
            })    
        })    
    })
</script>

It perfectly works, but is it possible to do it in more efficient way without var color = $(this).css("background-color");. Just after mouseout leave the previous background-color and remove #380606? Thank you.

Solution 1

If you don't care about IE ≤6, you could use pure CSS ...

.forum:hover { background-color: #380606; }

.forum { color: white; }
.forum:hover { background-color: #380606 !important; }
/* we use !important here to override specificity. see http://stackoverflow.com/q/5805040/ */

#blue { background-color: blue; }

<meta charset=utf-8>

<p class="forum" style="background-color:red;">Red</p>
<p class="forum" style="background:green;">Green</p>
<p class="forum" id="blue">Blue</p>

---

With jQuery, usually it is better to create a specific class for this style:

.forum_hover { background-color: #380606; }

and then apply the class on mouseover, and remove it on mouseout.

$('.forum').hover(function(){$(this).toggleClass('forum_hover');});

$(document).ready(function(){
  $('.forum').hover(function(){$(this).toggleClass('forum_hover');});
});

.forum_hover { background-color: #380606 !important; }

.forum { color: white; }
#blue { background-color: blue; }

<meta charset=utf-8>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<p class="forum" style="background-color:red;">Red</p>
<p class="forum" style="background:green;">Green</p>
<p class="forum" id="blue">Blue</p>

---

If you must not modify the class, you could save the original background color in .data():

  $('.forum').data('bgcolor', '#380606').hover(function(){
    var $this = $(this);
    var newBgc = $this.data('bgcolor');
    $this.data('bgcolor', $this.css('background-color')).css('background-color', newBgc);
  });

$(document).ready(function(){
  $('.forum').data('bgcolor', '#380606').hover(function(){
    var $this = $(this);
    var newBgc = $this.data('bgcolor');
    $this.data('bgcolor', $this.css('background-color')).css('background-color', newBgc);
  });
});

.forum { color: white; }
#blue { background-color: blue; }

<meta charset=utf-8>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<p class="forum" style="background-color:red;">Red</p>
<p class="forum" style="background:green;">Green</p>
<p class="forum" id="blue">Blue</p>

or

  $('.forum').hover(
    function(){
      var $this = $(this);
      $this.data('bgcolor', $this.css('background-color')).css('background-color', '#380606');
    },
    function(){
      var $this = $(this);
      $this.css('background-color', $this.data('bgcolor'));
    }
  );   

$(document).ready(function(){
  $('.forum').hover(
    function(){
      var $this = $(this);
      $this.data('bgcolor', $this.css('background-color')).css('background-color', '#380606');
    },
    function(){
      var $this = $(this);
      $this.css('background-color', $this.data('bgcolor'));
    }
  );    
});

.forum { color: white; }
#blue { background-color: blue; }

<meta charset=utf-8>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<p class="forum" style="background-color:red;">Red</p>
<p class="forum" style="background:green;">Green</p>
<p class="forum" id="blue">Blue</p>

Solution 2

Set the original background-color in you CSS file:

.forum{
    background-color:#f0f;
}​

You don't have to capture the original color in jQuery. Remember that jQuery will alter the style INLINE, so by setting the background-color to null you will get the same result.

$(function() {
    $(".forum").hover(
    function() {
        $(this).css('background-color', '#ff0')
    }, function() {
        $(this).css('background-color', '')
    });
});​

Solution 3

Try this , its working and simple

HTML

​​​​​​​​​​​​​​​​​​​​​<html>
<head></head>
<body>
    <div class="forum">
        test
    </div>
</body>
</html>​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

Javascript

$(document).ready(function() {
    var colorOrig=$(".forum").css('background-color');
    $(".forum").hover(
    function() {
        //mouse over
        $(this).css('background', '#ff0')
    }, function() {
        //mouse out
        $(this).css('background', colorOrig)
    });
});​

css ​

.forum{
    background:#f0f;
}​

live demo

http://jsfiddle.net/caBzg/

Solution 4

This should be set directly in the CSS.

.forum {background-color: #123456}
.forum:hover {background-color: #380606}

If you are worried about the fact the IE6 will not accept hover over elements which are not links, you can use the hover event of jQuery for compatibility.

Solution 5

HTML:

<div id="id">
</div>
<div id="hiddenDiv" style="display:none;"></div>

jQuery:

$('#id').hover(function(){
    $("#hiddenDiv").css('display','block');
  },
  function(){
    $("#hiddenDiv").css('display','none');
  }
);

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