I have a <div> which contains a bunch of <p>s and would like to have an opaque background image behind text, scaled to fill the entire <div>. I.e. no matter how much text I add or remove, the image should grow or shrink to cover the entire background of the <div>.
And only the image should have opacity. Text within the div should be solid black.
How do I do that, please? (and do I have to worry about browsers which do not support CSS3?)
[Answer] from o.p.
I stepped back and looked at the problem another way and found an answer which is cross-browser and does not need CSS3.
I fired up The Gimp and added opactiy into the image itself! Exactly what I sought to do, with no fancy CSS3 necessary ;-)
Thanks very much for your help, #JSW189. I hope you don't mind me posting in your answer, but this is the solution which I chose.
You want to use the background-image property to add the image, then background-size:100% to have the background image fill the entire div.
div {
background-image:url('image_url_goes_here.jpg');
background-size: 100%;
}
JS Fiddle Example.
Further, if you would like to toggle with the opacity, you can use the opacity property. It is set to opacity:1 (opaque) by default, but you can change that by toggling the opacity between 1 and 0. So, for example, if you want an opacity of 50%, you would use opacity:.5.
Opacity JS Fiddle Example.
Note that background-size is a CSS3 property. You can see a browser compatibility chart here. However, this problem can be solved by libraries like modernizr.
Related
I have a div element to which I set opacity: 0.7; in the CSS file because I would like the text inside it to be opaque. I display some images inside this div, but the images appear with the inherited opacity property. The result are opaque images.
Is it possible to give a CSS property to the images not to inherit the opacity of the div that contains them? If not, how can I avoid having the images opaque?
Thanks.
If you're using opacity to allow the text to have partial transparency, then simply set the color of the element:
#elemId {
color: rgba(0,0,0,0.7);
}
This lets you avoid adjusting the opacity property, and should work in all browsers that support the opacity property, too.
Only way is with positioning. Here is a great article from CSS Tricks: http://css-tricks.com/non-transparent-elements-inside-transparent-elements/
Use position: relative; and a top value to make elements over one another.
If you are just trying to make a background transparent then you can use the rgba() value in your background.
Edit:
Here is a crazy idea. You could use PHP GD to render a image with a gray backround(making transparent) with white text that you want to display in the correct position. Then use a mask-box-image or mask-image CSS property and set it to the rendered image.
If of course your content is not dynamic then you could make the image in Photoshop/whatever program.
Anti-aliasing would not be the same from the browser to the GD render but is the best hack if you do not want to use positioning.
Add the following code in your css
z-index:111
it works.
I'm trying to recreate something like this for one of the forms on my site by using opacity to make the form field background only 20% visible, but when I do this it also affects the text on the inside, and when you type something in. How can I make the opacity apply only to the background?
opacity will always affect all included (child) tags. You may put 1px png image with required color and 20% visibility in background (or, if that is some image there, not jus solid color - change alpha for the whole image). And looks like that is what you need (I finally understood that I should look at image instead of site design available by your link))
Another option is to put some div with opacity below other tags using css position, z-index etc. But in this case there should be one, for instance, div which contains all your content that should not be transparent and another div with opacity near it
Give a different class for the Field and Make opacity for field 100%
I have a menu with 5 items of varying text length - home, about us, contact us, etc
In the mockup in photoshop, I created a background image for the hover state but if it's longer than the text it gets cut off and it doesn't work in IE. The image is 105 X 28. Here's a link to example You'll see when you hover the background image gets cutoff. How can I fix this? Thanks
add a css rule to #main-nav li a{ min-width: 105px;}
I would recommend having a fixed size though ie 105px.. and then text-align:center for each of the menu items so they all line up nicely .. but that is up to you
The buttons aren't wide enough for the background image.
Give each li tag either the style width: 105px; height: 28px; or make a CSS class with that styling and apply the class to each one.
You can try using a rectangular background image and using the CSS border-radius attribute to round the corners.
If that doesn't get you the look you want or isn't compatible enough, the usual way is to make the image in three parts. The two ends plus a middle section that can be stretched or tiled.
A third approach is to use a rectangular background image again, and then creates "masks" which are images of the corner cutouts (which are same color as background) that are overlayed on the main background image to make the corners appear rounded. I haven't seen this approach as much since the border-radius attributes became widely supported.
Here is a pure CSS solution...
http://jsfiddle.net/wdm954/tAaCF/1/
Basically using CSS3 border-radius and box-shadow to replace the need for an image. This is going to be a bit less stylish in older browsers. For simple styling like this it shouldn't be a deal breaker if those who are already suffering through a lack of CSS3 across the Web don't get to see some pretty rounded corners. The older browsers will still show a blue background on hover.
Can you use the CSS Filter attribute for IE gradients AND implement a background image?
/*filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#2c8bcf', endColorstr='#0068b3');*/
As far as I know the background has to be "transparent" or none for the gradient filter to work..
perhaps you could wrap the gradient div with another div and put the background image on the outer one?
Wait! it does appear to work, glad I checked..
Working Example (IE only)
sorry about that I really thought it didn't work with a background, but couldn't find a reliable source - anyway in that fiddle above I changed the gradient to go from transparent to black
I'm not convinced that it can be done. It appears that in the jsfiddle above, the hex values have an extra 2 "0"s in them. if you set the values to actual hex chars, the example does not work. perhaps the background will show through if the gradient is going from transparent to a color only
I have a div with 60% opacity, to show part of a background image behind the div. Because the opacity is at 60%, the text in that div appears as grey.
Is there anyway to override this level and make the text appear black?
Any advice appreciated.
Thanks.
Set the opacity on the background rather than the element.
background-color: rgba(255,0,0,0.6);
A while ago I wrote about how to achieve this in a backwards compatible way.
I've experimented with this in the past on my own website. By far the easiest method to achieve what you want is to create a single-pixel .PNG image with its opacity set to less than 100% (i.e., partly-transparent) and use it as a background image. By default it will fill the whole containing element - make sure that the CSS background-repeat attribute is set to 'repeat' if it doesn't.
Doing things this way you don't have to set transparency on the containing element itself, hence the opacity of its text will be unaffected.
Amazingly, there is just the tool for making a semi-transparent single-pixel .PNG here.
The opacity applies to the whole div and all of its children. Unfortunately, you cannot undo that opacity, but only add more. And besides that, there's no way for CSS to select the text inside an element.
In your case, the best solution is to apply a transparent background image (with PNG) to your div block, like a white one pixel image with 60% opacity.
Another solution would be to use different boxes and positioning, like described in this tutorial by Steven York.
this should answer just about all of your questions: http://css-tricks.com/non-transparent-elements-inside-transparent-elements/
The simplest solution would be to create a semi-transparent PNG with the correct colour and use that as a background image.
Another solution that may be possible depending on your layout is to put the text in a separate layer and position that over the top of the semi-transparent part. Something like this would work:
<div style="position: relative; background-image: url('your_image.jpg')">
<div style="opacity: 0.5; background-color: #fff; position: absolute"></div>
<div style="position: absolute">The text to go on top</div>
</div>
You'd need to add your own positions/sizes (the top, left, width and height properties) as appropriate.