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naucon Breadcrumbs Package

About

The breadcrumb package helps to integrate a common breadcrumb navigation into a web application. The package includes two components: A breadcrumbs class to add breadcrumb elements and a breadcrumbs helper to render html markup in php or smarty templates.

Features

• add breadcrumbs with a title and a optional URL
• breadcrumb handler (null - default, session)
• breadcrumb helper to render html markup
• smarty plugins for breadcrumb helper
• reverse breadcrumb (fifo, lifo)
• fluent interface Breadcrumbs (add) BreadcrumbsHelper (setTag, setSeparator, setReverse, setOptions)

Compatibility

• PHP7.2+

Dependencies

• naucon Utility
• naucon Html Elements

Installation

install the latest version via composer

composer require naucon/breadcrumbs

Usage

initialize

To build a breadcrumb menu create a instance of Breadcrumbs.

use Naucon\Breadcrumbs\Breadcrumbs;
$breadcrumbs = new Breadcrumbs();

Afterwards you can add breadcrumbs to that instance with the method add(). This the first parameter a title of the breadcrumb must be defined. With the second parameter a URL can be defined (optional).

$breadcrumbs->add('home', '/home/');
$breadcrumbs->add('profile', '/profile/');
$breadcrumbs->add('address');

Another way is with the fluent interface.

$breadcrumbs->add('home', '/home/');
    ->add('profile', '/profile/');
    ->add('address');

With foreach you can iterate through the added breadcrumbs. The value is a instance of Breadcrumb which have methodes to access breadcrumb title and URL. The breadcrumbs a in the order they are added (FIFO).

foreach ($breadcrumbs as $breadcrumb)
{
    if ($breadcrumb->hasUrl()) {
        echo '<a href="' . $breadcrumb->getUrl() . '">' . $breadcrumb->getTitle() . '</a>';
    } else {
        echo $breadcrumb->getTitle();
    }
}

The output of the example would be

<a href="/home/">home</a><a href="/profile/">profile</a>address

To reverse the order of the breadcrumb use the method getReverseIterator(). The breadcrumbs will be interated in the reverse order they are added (LIFO).

$breadcrumbsIterator = $breadcrumbs->getReverseIterator();
foreach ($breadcrumbsIterator as $breadcrumb)
{
    if ($breadcrumb->hasUrl()) {
        echo '<a href="' . $breadcrumb->getUrl() . '">' . $breadcrumb->getTitle() . '</a>';
    } else {
        echo $breadcrumb->getTitle();
    }
}

The output of the example would be

address<a href="/profile/">profile</a><a href="/home/">home</a>

Breadcrumb Handler

Breadcrumb items are collected in a instance of BreadcrumbCollection. To read and write into the collection a handler is used. The default handler is BreadcrumbHandlerNull which only adds or remove entries to the collection.

In some use cases the breadcrumb entries must persist between page loads. In this cases the BreadcrumbHandlerSession can be set. The Handler will read and write into the $_SESSION variable.

// start session
session_start();

...

use Naucon\Breadcrumbs\Breadcrumbs;
use Naucon\Breadcrumbs\Handler\BreadcrumbHandlerSession;
$breadcrumbs = new Breadcrumbs();
$breadcrumbs->setBreadcrumbHandler(new BreadcrumbHandlerSession());

...

// add breadcrumb entry
$breadcrumbs->add('Home', '/home/');

...

// close session
session_write_close();

Make sure that you started and close session befor and after you use the breadcrumb.

Breadcrumb helper

With the breadcrumb helper a instance of Breadcrumbs can be rendered in HTML Markup.

To use the helper create a instance of BreadcrumbsHelper and give the constructor a instance of Breadcrumbs.

use Naucon\Breadcrumbs\Helper\BreadcrumbsHelper;
$breadcrumbsHelper = new BreadcrumbsHelper($breadcrumbs);

With the method render() the html markup will be generated an returned.

echo $breadcrumbsHelper->render();

// <a href="/home/">home</a><a href="/profile/">profile</a>address

With the method setSeparator() a separator between the breadcrumbs can be defined.

$breadcrumbsHelper->setSeparator(' / ');
echo $breadcrumbsHelper->render();

// <a href="/home/">home</a> / <a href="/profile/">profile</a> / address

With the method setReverse() the order of the breadcrumbs can be reversed.

$breadcrumbsHelper->setReversed(); // or $breadcrumbsHelper->setReversed(true);
echo $breadcrumbsHelper->render();

// address / <a href="/profile/">profile</a> / <a href="/home/">home</a>

With the method setSkipLinks() links will be skipped in render.

$breadcrumbsHelper->setSkipLinks(); // or $breadcrumbsHelper->setSkipLinks(true);
echo $breadcrumbsHelper->render();

// home / profile / home

With the method setTag() a html element can be set surround the breadcrumb. The following html element are supported: span, div, li, ul, ol

Example with span element:

$breadcrumbsHelper->setTag('span');
$breadcrumbsHelper->setSeparator(' / ');
echo $breadcrumbsHelper->render();

// <span><a href="/home/">home</a></span> / <span><a href="/profile/">profile</a></span> / <span>address</span>

Example with div element:

$breadcrumbsHelper->setTag('div');
$breadcrumbsHelper->setSeparator(' / ');
echo $breadcrumbsHelper->render();

// <div><a href="/home/">home</a></div> / <div><a href="/profile/">profile</a></div> / <div>address</div>

Example with li element:

$breadcrumbsHelper->setTag('div');
$breadcrumbsHelper->setSeparator(' / ');
echo $breadcrumbsHelper->render();

// <li><a href="/home/">home</a></li> / <li><a href="/profile/">profile</a></li> / <li>address</li>

When using the tag ul or ol also the attributes id, class, style can be defined.

Example with ul element:

$breadcrumbsHelper->setTag('ul');
$breadcrumbsHelper->setOptions(array('id' => 'breadcrumb', 'class' => 'breadcrumbs'));
echo $breadcrumbsHelper->render();

// <ul id="breadcrumb" class="breadcrumbs"><li><a href="/home/">home</a></li><li><a href="/profile/">profile</a></li><li>address</li></ul>

Example with ol element:

$breadcrumbsHelper->setTag('ol');
$breadcrumbsHelper->setOptions(array('id' => 'breadcrumb', 'class' => 'breadcrumbs'));
echo $breadcrumbsHelper->render();

// <ol id="breadcrumb" class="breadcrumbs"><li><a href="/home/">home</a></li><li><a href="/profile/">profile</a></li><li>address</li></ol>

Breadcrumb Smarty Plugin

When using the Smarty Template Engine the breadcrumb helper can be integrated with a smarty plugin.

First have hook up the smarty plugins to smarty.

$smartyObject->plugins_dir[] = PATH_LIBRARY . 'vendor/naucon/Breadcrumbs/SmartyPlugins';

Next assign the instance of Breadcrumbs class to smarty.

$smarty->assign('breadcrumbs', $breadcrumbs);

Then add the plugin to the template.

{ncbreadcrumbs from=$breadcrumbs tag='span' separator=' / '}

or

{ncbreadcrumbs from=$breadcrumbs tag='div' separator=' / '}

or

{ncbreadcrumbs from=$breadcrumbs tag='ul' id='breadcrumb' class='breadcrumbs'}

or

{ncbreadcrumbs from=$breadcrumbs tag='ol' id='breadcrumb' class='breadcrumbs'}

or

{ncbreadcrumbs from=$breadcrumbs tag='ol' id='breadcrumb' class='breadcrumbs' reverse=true}

or

{ncbreadcrumbs from=$breadcrumbs separator=' / ' skip-links=true}

The smarty plugin supports the following parameters

• from = assigned breadcrumbs variable (MUST)
• tag = define html tag surrounding the breadcrumb elements (optional)
• separator = define separator between the breadcrumb elements (optional)
• reverse = define the order that the breadcrumbs is iterated (optional)
• skip-links = links will not be rendered (optional)
• id = define a id attribute on a surrounding html element like ul and ol but not div, span or li (optional)
• class = define a id attribute on a surrounding html element like ul and ol but not div, span or li (optional)
• style = define a id attribute on a surrounding html element like ul and ol but not div, span or li (optional)