I am working on a PHP file. I'm working on the menu bar, the menu bar contains all the image buttons, if someone hovers on one of the buttons I want them to change image(color). Could someone help me out with this?
$globalsettings = array(
'src' => $sImageURL.'global1.png',
'alt' => $clang->gT("Global participant settings"),
'title' => $clang->gT("Global participant settings"),
'style' => 'margin-left:5px',
'style' => 'margin-right:1px'
);
You can create hover effects using CSS (cascading stylesheets). Your CSS must be in an external stylesheet or embedded style element.
I'm using BUTTON that will style all <button> elements, but you can replace it with whatever element you want to style, such as an <img> with IMG (lowercase or uppercase).
BUTTON {
background: url(my_bg.png);
}
BUTTON:hover {
background: url(my_hover_bg.png);
}
If you don't know how to use stylesheets, just insert embedded styling into the <head> of your HTML document.
<style type="text/css">
/* Place CSS here */
</style>
If you want you can take it a step further and use CSS sprites (like old videos games used to do it). CSS sprites are a collection of images in one single image, and you simply change the position of the location of the background, and it creates the effect. You can achieve this like this:
#myelement {
background: url(my_bg.png) -0 -0;
}
#myelement:hover {
background: url(my_bg.png) -0 -100px;
}
There are also old school ways of hover effects but they're like Frontpage-era, so I don't recommend using them. CSS hover effects is the standard of today.
You're trying to solve 2 problems in one step. You need to get the images to display and then swap between them on hover.
You can't dynamically edit a button in JS (ok, you could with canvases and html 5 but it's non-trivial). So, you need to use CSS (or possibly JS) to to swap between 2 images.
Where those images come from is up to you - you can either pre-generate them which is a little work up front but easy to implement and no PHP required. This would be the preferred option if there's only one or two variations in colour.
Alternatively, you can have a PHP script which generates the images on-the-fly (and ideally caches them to save recomputing them later). This allows for infinite variation but requires more overhead on the server. This approach is commonly used to generate thumbnails as the source image isn't known in advance
Note that PHP has no control over when each image is displayed - it simply provides images to your CSS/JS in exactly the same way as a webserver would serve a static image.
If you want to edit an image in PHP, you need to look at the GD+ library
You can use css to do this quite easily by using the content: selector.
for example, your markup might look like this:
<div class="link" id="link1">
<a href="yourhref"><img /></a>
</div>
and the css would be something like:
#link1 a img{
content:url("http://www.maxxpotential.com/stephen2/wp-content/uploads/2013/03/Images-from-Deep-in-the-Woods-by-Astrid-Yskout-4.jpg");
}
#link1:hover a img{
content:url("http://blogs.mathworks.com/pick/files/zebrainpastelfield.png");
}
by using the selectors you assign in your script, you should find it pretty easy to amend this to suit your needs.
here is a working fiddle demonstrating this http://jsfiddle.net/pWYtu/1
You can use sprite image and onhover change position. also you will get benefit of performance.
:hoverso it changes background color.