How to set opacity in parent div and not affect in

问题:

This question already has an answer here:

• I do not want to inherit the child opacity from the parent in CSS 14 answers

Hey i am searching in google but i can't fine any perfect answer

I want to Opacity in parent DIV but not Child DIV

Example

HTML

<div class="parent">
<div class="child">
Hello I am child 
</div>
</div>

Css

.parent{
background:url('../images/madu.jpg') no-repeat 0 0;
}
.child{
Color:black;
}

Note: -- I want to background-image in Parent Div not Color

回答1:

May be it's good if you define your background-image in the :after pseudo class. Write like this:

.parent{
    width:300px;
    height:300px;
    position:relative;
    border:1px solid red;
}
.parent:after{
    content:'';
    background:url('http://www.dummyimage.com/300x300/000/fff&text=parent+image');
    width:300px;
    height:300px;
    position:absolute;
    top:0;
    left:0;
    opacity:0.5;
}
.child{
    background:yellow;
    position:relative;
    z-index:1;
}

Check this fiddle

回答2:

I know this is old, but just in case it will help someone else.

<div style="background-color: rgba(255, 0, 0, 0.5)">child</div> 

Where rgba is: red, green, blue, and a is for transparency.

回答3:

You can do it with pseudo-elements: (demo on dabblet.com)

your markup:

<div class="parent">
    <div class="child"> Hello I am child </div>
</div>

css:

.parent{
    position: relative;
}

.parent:before {
    z-index: -1;
    content: '';
    position: absolute;

    opacity: 0.2;
    width: 400px;
    height: 200px;
    background: url('http://img42.imageshack.us/img42/1893/96c75664f7e94f9198ad113.png') no-repeat 0 0; 
}

.child{
    Color:black;
}

回答4:

As mentioned by Tom, background-color: rgba(229,229,229, 0.85) can do the trick. Place that on the style of the parent element and child wont be affected.

回答5:

You can't. Css today simply doesn't allow that.

The logical rendering model is this one :

If the object is a container element, then the effect is as if the contents of the container element were blended against the current background using a mask where the value of each pixel of the mask is .

Reference : css transparency

The solution is to use a different element composition, usually using fixed or computed positions for what is today defined as a child : it may appear logically and visualy for the user as a child but the element doesn't need to be really a child in your code.

A solution using css : fiddle

.parent {
    width:500px;
    height:200px;    
    background-image:url('http://canop.org/blog/wp-content/uploads/2011/11/cropped-bandeau-cr%C3%AAte-011.jpg');
    opacity: 0.2;
}
.child {
    position: fixed;
    top:0;
}

Another solution with javascript : fiddle

回答6:

I had the same problem and I fixed by setting transparent png image as background for the parent tag.

This is the 1px x 1px PNG Image that I have created with 60% Opacity of black background !

回答7:

You can't do that, unless you take the child out of the parent and place it via positioning.

The only way I know and it actually works, is to use a translucid image (.png with transparency) for the parent's background. The only disavantage is that you can't control the opacity via CSS, other than that it works!