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Adding Pagination Links
7:05Great, now we need to add pagination links so we can navigate between the pages. I want to add these links both above the results and below the results. But I don’t want to repeat the code, so I’m going to move this code into a variable called $pagination and move it up into the initial code block.
Back in the catalog.php file,
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Directly before the unordered list,
we're gonna add our pagination links.
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We'll start with a new div.
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We'll give this a class of pagination.
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Then we'll add Pages, with a colon.
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Next we need to add some code
to show our pages and links.
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We can use a while loop to
create a count of numbers
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that are less than
the total number of pages.
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Let's start by opening our php block.
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First, we need an incremental variable.
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Will name this i,
we'll set it to zero initially.
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Then we can do a while
($i < $total_pages) {.
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Then we need to add one
to i every time we loop.
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We could use, I equals I plus one.
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Or we could simplify this.
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I plus equals one.
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Or we can simplify this it even further.
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I plus plus.
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All of these options do the same thing.
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The last one is the most common way of
adding a single number to an integer, so
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we use that.
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Speaking of common practice,
usually you'll see these three lines
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combine into a single statement using for
instead of while.
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We'll move i = 0 into our for,
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including the semi colon.
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We then add i plus plus to the end
separated by a semi colon.
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We don't need a semi colon at the end.
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The only difference in
writing a statement this way
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is that adding one to the i variable
won't happen until the end of the loop.
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So when working with the i
variable within the loop,
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our first loop through I
will be equal to zero.
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We want to start with page one.
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So we'll change our initial value to one.
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We also need to change our comparison.
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We'll change it to less-then or
equal-to total pages.
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If i is less than or equal to our total
pages, we want to enter our loop.
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Now, what do we want to do in the loop?
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Well, that depends on what page we're on.
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So let's start with the conditional.
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If i is equal to our current page,
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then we just want to echo out i.
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We'll surround this by a span tag.
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We can leave our single variable
right in our double quotes.
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If it's not equal to our current page,
then we want to link to that page.
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So we're going to echo a link.
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We're going to link to
our catalog page but
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we need to know if we're
on a category page or not.
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So add a conditional.
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If it's set, then we want to make sure
our link links to that category page.
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And we finish with an ampersand.
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Finally we'll add our page number.
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Well use I for that and
we'll close out our link.
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We'll use I for
the display again and are a tag.
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A couple things to clean up,
let's finish our if else statement.
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And let's add a space at the beginning of
our numbers, just so they're separated.
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Now we're ready to check
this out in our browser.
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Great, now we see all the pages and
we can navigate between those pages.
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I want to add these links both above
the results and below the results.
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So let's go back to our page.
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I don't want to repeat this code so let's
add it to a variable name pagination.
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We're gonna put this up
in our initial php block.
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Because there are quotes
within this quote,
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we need to escape them
using our slash quote.
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We'll use .= for concatenation.
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We don't need our php tag here since
we're already in our php block.
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Let's also remove the closing tag here.
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Instead of echo we're going
to use pagination .=.
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Add our final closing div and
our pagination variable is ready to go.
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We can clean this up a little here, and
now let's display it where we want.
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We want to echo pagination.
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Above our on ordered list.
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And also below, let's save this page and
refresh our browser.
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Great, our pagination links are above
our results and below our results.
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Fantastic job.
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We've cleaned up our
calls to the database so
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that we're only pulling
the information we need.
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We've limited the number
of results per page so
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we don't overwhelm
visitors to our catalog.
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And we've set up linking between pages,
both for our full catalog and for
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our category pages.
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You are ready for our final feature.
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Search capabilities.
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