A Bootstrap carousel with dual indicators/controls for WordPress. Populated by ACF “relationship” field.
Indicators
This carousel has two sets of indicators - a set of numbers, and an un-numbered “standard” set of indicators.
It needs a bit of work to have the active class attached properly to the second set of indicators.
This is achieved by:
Giving a unique class name to these indicators (e.g. class="no-numbers"
)
Testing the contained list items data-slide-to=
against the currently displayed item
Building the Carousels - ACF
The carousel content is built from an ACF “relationship” field, which is used to create a custom WordPress loop. In this case, the relationship field is used to create a loop of “report” custom post types.
Build the Carousel
This PHP function builds the carousel. The code could be added to the theme custom.php file. I usually keep custom loops in a unique file for ease of editing, and require_once this file in functions.php .
/*==============================================================================
Case Studies for Services Mobile
============================================================================*/
function carawebs_reports_mobile() {
$relationship_field = 'related'; // This could be passed into the function
$posts = get_field($relationship_field);
if ($posts) {
?>
<div id= "mobile-reports-carousel" class= "carousel slide" data-ride= "carousel" >
<!-- Indicators -->
<ol class= "carousel-indicators numbered list-unstyled list-inline" >
<?php
$item_count = 0 ; // Start up a count
foreach ( $posts as $post ) { // Loop through the array
?>
<li data-target= "#mobile-reports-carousel" data-slide-to= " <?php echo $item_count ; ?> " > <?php echo $item_count + 1 ; ?> </li>
<?php
$item_count ++ ;
} ?>
</ol>
<div id= "carousel-count" ></div> <!-- output carousel index & total number of slides for debugging, set by jQuery function -->
<ol class= "carousel-indicators no-numbers" >
<?php
$item_count = 0 ;
foreach ( $posts as $post ) {
?>
<li data-target= "#mobile-reports-carousel" data-slide-to= " <?php echo $item_count ; ?> " ></li> <?php
$item_count ++ ;
} ?>
</ol>
<div class= "carousel-inner" >
<?php
$number = 0 ;
foreach ( $posts as $post ) { // variable must be called $post (IMPORTANT)
global $post ;
setup_postdata ( $post );
?>
<div class= "item counter- <?php echo $number ; ?> " >
<?php
// custom function to bring in the 'medium' featured image
carawebs_featured_image ( 'medium' ); ?>
<h4><a href= " <?php the_permalink (); ?> " > <?php the_title (); ?> </a></h4>
<div class= "post_content" > <?php the_content (); ?> </div>
<?php
// Another custom field - builds a ul of file downloads
carawebs_download_link_repeater (); ?>
</div>
<?php
$number ++ ;
} ?>
</div>
</div>
<?php
// Restore original Post Data
wp_reset_postdata ();
}
}
This carousel needed to replace a more elaborate slider at small screen sizes.
<section>
<div class= "row report-downloads" >
<h2 class= "text-center" > Report Downloads</h2>
<?php
// This function returns 'true' for mobile phones
if (carawebs_is_phone()=='true'){
// If this is a mobile phone
// --------------------------
// #innovations--section-toggle & #innovation-content set up for collapse in /assets/js/_frontpage-toggles.js
?> <div id= "reports-mobile" class= "row" >
<?php carawebs_reports_mobile(); ?>
</div> <?php
} else {
// The device is NOT a phone
// Hide at small screens using CSS - target #reports-desktop
// --------------------------
?>
<div id= "reports-desktop" >
<?php carawebs_reports_desktop(); ?>
</div>
<?php
// Add the mobile view stuff here to allow a mobile-type view on contracted desktops
// ---------------------------
?>
<div id= "reports-mobile-visible" >
<div class= "col-xs-14 col-xs-offset-1" >
<?php carawebs_reports_mobile(); ?>
</div>
</div> <?php
}
?>
</div>
</section> <!-- /.report-downloads -->
The “check for phone” function:
/*==============================================================================
Detect Phones
============================================================================*/
function carawebs_is_phone() {
$useragent=$_SERVER['HTTP_USER_AGENT'];
if(preg_match('/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i',$useragent)||preg_match('/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i',substr($useragent,0,4)))
return true;
}
See here for lioghtweight phone detection strings: http://detectmobilebrowsers.com/ .
This might be a useful phone detecting class: https://github.com/serbanghita/Mobile-Detect/ .
For the non-phone case, the relevant divs are shown/hidden by means of CSS.
jQuery
Controls are built into /js/_carousel.js :
/*==============================================================================
Set up - give first items emphasis classes.
Necessary because the slider is built dynamically
==============================================================================*/
$ ( "#mobile-reports-carousel .carousel-indicators li:first" ). addClass ( "active" );
$ ( "#mobile-reports-carousel .carousel-indicators.no-numbers li:first" ). addClass ( "active" );
// Give active class to the first carousel item
$ ( "#mobile-reports-carousel .item:first" ). addClass ( "active" );
// Prevent auto play
$ ( '#mobile-reports-carousel' ). carousel ({ interval : false });
/*==============================================================================
Listen to the 'slid carousel' event to trigger code after each slide change
==============================================================================*/
$ ( '#case-studies-carousel' ). on ( 'slid.bs.carousel' , function () {
// For debugging...
//alert("We have SLID!!! Thank God it's working...");
// Useful variables
var carouselData = $ ( this ). data ( 'bs.carousel' );
// get current index the Bootstrap way...
var currentIndex = carouselData . getItemIndex ( carouselData . $element . find ( '.item.active' ));
var total = carouselData . $items . length ;
// ...get the current index the jQuery way...
var itemIndex = $ ( ".item.active" );
var jCurrentIndex = itemIndex . index ();
// For debugging: needs a #carousel-count div in the markup
var text = ( "Index: " + jCurrentIndex );
$ ( '#carousel-count' ). text ( text );
// Using bs method, getItemIndex - see: https://github.com/twbs/bootstrap/issues/14215
//$('.carousel-indicators.no-numbers [data-slide-to=' + currentIndex + ']').addClass('active');//
// Pure jQuery method - attach the active class to the indicator corresponding to the current item
// -----------------------------------
$ ( '.carousel-indicators.no-numbers [data-slide-to=' + jCurrentIndex + ']' ). addClass ( 'active' );
});
Mobile Swipe Support
For mobile swipe support, use the touchSwipe jQuery plugin . This plugin is copyright (c) 2010 Matt Bryson and is dual licensed under the MIT or GPL Version 2 licenses.