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One of the last things you might want to do working with your grids in responsive design inside of Bootstrap is you may wish to have some particular parts of the layout visible only on a desktop or visible only on a tablet, visible only on a phone, or you may want to hide on one of those devices, and Bootstrap includes some classes that will allow you to do exactly that. I am at getbootstrap.com, and I'm under the Scaffolding tab under Responsive design, and if you'll just scroll on down here a little bit on this page, you'll see a very useful chart here under Responsive utility classes.
So this explains to you exactly how these particular classes work and what particular devices using those classes will produce content that's visible or invisible on certain devices. We're going to put those to work here in just a second. So, what I would like to do is I'd like to set up a row on the web page that we've been working on so far, and I'm going to have it set up such that I'm going to have some text that's going to show up only on certain devices, and the important part to remember about this is the way that these particular CSS classes work.
First of all, the big hint here is these are CSS, so they are testing the width of the window of the browser, they are not actually testing the device, which is something very different that actually comes over as part of the header in the request process for getting web pages. This is just testing the width of the screen, so it's calling things phone, tablets, and desktops, but just by making your screen wider or making your screen narrower, you'll be able to simulate phones, tablets, and desktops, and they will work just fine.
So again, remember that phone, tablet, and desktop actually refer to specific widths of the screen, and those widths are detailed right here. Phones are 767 pixels and below, tablets are 768 pixels to 979 pixels, and desktops are the default, something wider than 979 pixels. So inside of Dreamweaver, if you scroll it down to just before the footer here--let's go ahead and add another part of this web page. I'm going to add a section with a class just as we've been doing all along here of row-fluid, and inside of here I'm going to add three divs, so I'm going to say div with the class of span4. This is visible on the desktop.
I'm going to add a second div with the class of span4. This is visible on a tablet, and then finally, a div with a class of span4, this is visible on the phone, okay. So we've got these all set up. Now what I'm going to do is I'm going to add classes here. So in addition to this class of span4, if you just put a space, that will allow you to play more than one class per particular HTML tag, and I'm going to say visible-desktop, on the second one here we'll say visible-tablet, and on the third one here we'll say visible-phone.
So go ahead and save that, and now when I go to Firefox to preview this page, down here at the bottom you'll see this is visible on the desktop. As I make the screen smaller, and I pull it over a little bit, you see that text has now changed to This is visible on the tablet, and now as I pull the screen even further over, and it resizes again, you'll see down here at the bottom it says This is visible on the phone.
So that's the way this particular classes work. The hidden classes work very much the same way, and you can give those a try on your own.
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