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ギャラリー用のメタボックスの追加設定

function.php

//投稿ボックスギャラリー用
/*管理画面が開いたときに実行*/
add_action( 'admin_init', 'my_admin_init2' );

/*更新ボタンが押されたときに実行*/
add_action('save_post', 'save_custom_field_postdata');
 
/* カスタムフィールドを投稿画面に追加 */
function my_admin_init2() {
	add_meta_box( 'my_meta_box_post2', '添付写真', 'my_meta_box_gallery', gallery );
}

/* 投稿画面に表示するフォームのHTMLソース */
function my_meta_box_gallery() {
    //既に値がある場合は値をフォームに反映して出力
    $uploaded_image = get_post_meta( $_GET['post'], 'upload_image' );

?>
<div id="meta_div">
<?php print_r ($uploaded_image);?>
<ul id="meta_ul">
<div class="uploadedImageView"></div>
<?php
if($uploaded_image == ""){ $num = 1 ; }else{ $num = 0 ; }
$com = $num + count($uploaded_image[0]);
for($i = 1; $i <= $com; $i++):
?>

<li class='inbox'>
<input type='text' class="upload_image" name='upload_image[]' value='<?php echo esc_html($uploaded_image[0][$i-1]);?>'> <span class="upload_image_button">IMAGE</span>|<span class='deth'>Delete</span>
</li>
<?php endfor;?>
</ul>
<span id="animate">テキストエリアを追加</span>
<div id="mydialog" class="cf">

<div id="drop-files" ondragover="return false">
		Drop Images Here
</div>
	
	<div id="uploaded-holder" >
		<div id="dropped-files">
			<div id="upload-button">
				<a href="#" class="upload">Upload!</a>
				<a href="#" class="delete">delete</a>
				<span>0 Files</span>
			</div>
		</div>
		<div id="extra-files">
			<div class="number">
				0
			</div>
			<div id="file-list">
				<ul></ul>
			</div>
		</div>
	</div>
	
	<div id="loading">
		<div id="loading-bar">
			<div class="loading-color"> </div>
		</div>
		<div id="loading-content">Uploading file.jpg</div>
	</div>
	

</div>
</div>
<script>
jQuery(document).ready(function () {


function app(){
var bts = jQuery('.deth').size();
if(bts == 1){
jQuery('.deth').hide();
}else{
jQuery('.deth').show();
}
}

app();

jQuery("#animate").click(function(){
jQuery("#meta_ul li:first").clone().appendTo("#meta_ul");
jQuery("#meta_ul li:last input").val("");
app();
});

jQuery("span.deth").live("click",
function(){
jQuery(this).fadeOut("slow" , function (){
jQuery(this).closest('li').remove('.inbox');
app();
});
});



});
</script>


<?php
}

/* 設定したカスタムフィールドの値をDBに書き込む記述 */
function save_custom_field_postdata( $post_id ) {
    $mydata = $_POST['upload_image'];
    if ( "" == get_post_meta( $post_id, 'upload_image' )) {
        /* upload_imageというキーでデータが保存されていなかった場合、新しく保存 */
        add_post_meta( $post_id, 'upload_image', $mydata, true ) ;
    } else if ( $mydata != get_post_meta( $post_id, 'upload_image' )) {
        /* upload_imageというキーのデータと、現在のデータが不一致の場合、更新 */
        update_post_meta( $post_id, 'upload_image', $mydata ) ;
    } else if ( "" == $mydata ) {
        /* 現在のデータが無い場合、page_layoutというキーの値を削除 */
        delete_post_meta( $post_id, 'upload_image' ) ;
    }
}

//管理画面にアップローダー用のJSを追加
function admin_js() {
global $post_type;
if( 'gallery' == $post_type ) {
 wp_enqueue_script('admin', get_bloginfo('template_url').'/js/my_admin_scripts.js', null, true);
}
}
add_action( 'admin_print_scripts-post-new.php', 'admin_js', 1000 );
add_action( 'admin_print_scripts-post.php', 'admin_js', 1000 );

JS

jQuery(document).ready(function() {
	
	// Makes sure the dataTransfer information is sent when we
	// Drop the item in the drop box.
	jQuery.event.props.push('dataTransfer');
	
	var z = -40;
	// The number of images to display
	var maxFiles = 5;
	var errMessage = 0;
	
	// Get all of the data URIs and put them in an array
	var dataArray = [];
	
	// Bind the drop event to the dropzone.
	jQuery('#drop-files').bind('drop', function(e) {
			
		// Stop the default action, which is to redirect the page
		// To the dropped file
		
		var files = e.dataTransfer.files;
		
		// Show the upload holder
		jQuery('#uploaded-holder').show();
		
		// For each file
		jQuery.each(files, function(index, file) {
						
			// Some error messaging
			if (!files[index].type.match('image.*')) {
				
				if(errMessage == 0) {
					jQuery('#drop-files').html('Hey! Images only');
					++errMessage
				}
				else if(errMessage == 1) {
					jQuery('#drop-files').html('Stop it! Images only!');
					++errMessage
				}
				else if(errMessage == 2) {
					jQuery('#drop-files').html("Can't you read?! Images only!");
					++errMessage
				}
				else if(errMessage == 3) {
					jQuery('#drop-files').html("Fine! Keep dropping non-images.");
					errMessage = 0;
				}
				return false;
			}
			
			// Check length of the total image elements
			
			if(jQuery('#dropped-files > .image').length < maxFiles) {
				// Change position of the upload button so it is centered
				var imageWidths = ((220 + (40 * jQuery('#dropped-files > .image').length)) / 2) - 20;
				jQuery('#upload-button').css({'left' : imageWidths+'px', 'display' : 'block'});
			}
			
			// Start a new instance of FileReader
			var fileReader = new FileReader();
				
				// When the filereader loads initiate a function
				fileReader.onload = (function(file) {
					
					return function(e) { 
						
						// Push the data URI into an array
						dataArray.push({name : file.name, value : this.result});
						
						// Move each image 40 more pixels across
						z = z+40;
						var image = this.result;
						
						
						// Just some grammatical adjustments
						if(dataArray.length == 1) {
							jQuery('#upload-button span').html("1 file to be uploaded");
						} else {
							jQuery('#upload-button span').html(dataArray.length+" files to be uploaded");
						}
						// Place extra files in a list
						if(jQuery('#dropped-files > .image').length < maxFiles) { 
							// Place the image inside the dropzone
							jQuery('#dropped-files').append('<div class="image" style="left: '+z+'px; background: url('+image+'); background-size: cover;"> </div>'); 
						}
						else {
							
							jQuery('#extra-files .number').html('+'+(jQuery('#file-list li').length + 1));
							// Show the extra files dialogue
							jQuery('#extra-files').show();
							
							// Start adding the file name to the file list
							jQuery('#extra-files #file-list ul').append('<li>'+file.name+'</li>');
							
						}
					}; 
					
				})(files[index]);
				
			// For data URI purposes
			fileReader.readAsDataURL(file);
	
		});
		

	});
	
	function restartFiles() {
	
		// This is to set the loading bar back to its default state
		jQuery('#loading-bar .loading-color').css({'width' : '0%'});
		jQuery('#loading').css({'display' : 'none'});
		jQuery('#loading-content').html(' ');
		// --------------------------------------------------------
		
		// We need to remove all the images and li elements as
		// appropriate. We'll also make the upload button disappear
		
		jQuery('#upload-button').hide();
		jQuery('#dropped-files > .image').remove();
		jQuery('#extra-files #file-list li').remove();
		jQuery('#extra-files').hide();
		jQuery('#uploaded-holder').hide();
	
		// And finally, empty the array/set z to -40
		dataArray.length = 0;
		z = -40;
		
		return false;
	}
	
	jQuery('#upload-button .upload').click(function() {
		
		jQuery("#loading").show();
		var totalPercent = 100 / dataArray.length;
		var x = 0;
		var y = 0;
		
		jQuery('#loading-content').html('Uploading '+dataArray[0].name);
		
		jQuery.each(dataArray, function(index, file) {	
			
			jQuery.post('/date/wp_fileuploads.php', dataArray[index], function(data) {
			
				var fileName = dataArray[index].name;
				++x;
				
				// Change the bar to represent how much has loaded
				jQuery('#loading-bar .loading-color').css({'width' : totalPercent*(x)+'%'});
				
				if(totalPercent*(x) == 100) {
					// Show the upload is complete
					jQuery('#loading-content').html('Uploading Complete!');
					
					// Reset everything when the loading is completed
					setTimeout(restartFiles, 500);
					
				} else if(totalPercent*(x) < 100) {
				
					// Show that the files are uploading
					jQuery('#loading-content').html('Uploading '+fileName);
				
				}
				
				// Show a message showing the file URL.
				var dataSplit = data.split(':');
				if(dataSplit[1] == 'uploaded successfully') {

					
					jQuery('#meta_ul').append('<li><a href="/date/images/'+dataSplit[0]+'">'+fileName+'</a> '+dataSplit[1]+'</li>');
				

				
				} else {
					jQuery('#meta_ul').append('<li><a href="/date/images/'+data+'. File Name: '+dataArray[index].name+'</li>');
				}
				
			});
		});
		
		return false;
	});
	
	// Just some styling for the drop file container.
	jQuery('#drop-files').bind('dragenter', function() {
		jQuery(this).css({'box-shadow' : 'inset 0px 0px 20px rgba(0, 0, 0, 0.1)', 'border' : '4px dashed #bb2b2b'});
		return false;
	});
	
	jQuery('#drop-files').bind('drop', function() {
		jQuery(this).css({'box-shadow' : 'none', 'border' : '4px dashed rgba(0,0,0,0.2)'});
		return false;
	});
	
	// For the file list
	jQuery('#extra-files .number').toggle(function() {
		jQuery('#file-list').show();
	}, function() {
		jQuery('#file-list').hide();
	});
	
	jQuery('#dropped-files #upload-button .delete').click(restartFiles);
	
	// Append the localstorage the the uploaded files section
	/*if(window.localStorage.length > 0) {
		jQuery('#uploaded-files').show();
		for (var t = 0; t < window.localStorage.length; t++) {
			var key = window.localStorage.key(t);
			var value = window.localStorage[key];
			// Append the list items
			if(value != undefined || value != '') {
				jQuery('#uploaded-files').append(value);
			}
		}
	} else {
		jQuery('#uploaded-files').hide();
	}*/
});

wp_fileuploads.php

<?php

// We're putting all our files in a directory called images.
$uploaddir = 'images/';

// The posted data, for reference
$file = $_POST['value'];
$name = $_POST['name'];

// Get the mime
$getMime = explode('.', $name);
$mime = end($getMime);

// Separate out the data
$data = explode(',', $file);

// Encode it correctly
$encodedData = str_replace(' ','+',$data[1]);
$decodedData = base64_decode($encodedData);

// You can use the name given, or create a random name.
// We will create a random name!

$randomName = substr_replace(sha1(microtime(true)), '', 12).'.'.$mime;


if(file_put_contents($uploaddir.$randomName, $decodedData)) {
	echo $randomName.":uploaded successfully";
}
else {
	// Show an error message should something go wrong.
	echo "Something went wrong. Check that the file isn't corrupted";
}


?>

CSSの設定

#drop-files {
	width: 100px;
	height: 55px;
	background: rgba(0,0,0,0.1);
	border-radius: 10px;
	border: 4px dashed rgba(0,0,0,0.2);
	padding: 75px 0 0 0;
	text-align: center;
	font-size: 2em;
	float: left;
	font-weight: bold;
	margin: 0 20px 20px 0;
}

#dropped-files {
	float: left;
	position: relative;
	width: 560px;
	height: 125px;
}

#upload-button {
	position: absolute;
	top: 87px;
	z-index: 9999;
	width: 210px;
	display: none;
}

#dropped-files .image {
	height: 100px;
	width: 200px;
	border: 4px solid #fff;
	position: absolute;
	box-shadow: 0px 0px 10px rgba(0,0,0,0.1);
	background: #fff;
	border-radius: 4px;
	overflow: hidden;
}

#upload-button .ss-upload {
	font-size: 0.7em;
}

#upload-button a {
	text-decoration: none;
	color: #fff;
	font-weight: bold;
	box-shadow: 0 0 1000px 62px rgba(255, 255, 255, 1), inset 0 -35px 40px -10px #0A9FCA;
	font-size: 20px;
	padding: 10px 20px;
	background-color: #4bc1e3;
	border-radius: 10px;
}

#upload-button span {
	display: block;
	width: 160px;
	text-align: center;
	margin: 20px 0 0 0;
	background: white;
	border-radius: 10px;
	font-size: 1.1em;
	padding: 4px 0;
	position: relative;
	left: -14px;
}
#upload-button a:hover {
	box-shadow: 0 0 1000px 62px rgba(255, 255, 255, 1), inset 0 -5px 40px 0px #0A9FCA;	
}

#extra-files {
	display: none;
	float: left;
	position: relative;
}

#extra-files .number {
	background: rgba(0,0,0,0.6);
	border-radius: 4px;
	display: inline-block;
	position: relative;
	font-weight: bold;
	color: #fff;
	padding: 20px 30px;
	margin: 60px 0 0 0;
	cursor: pointer;
	font-size: 30px;
}

#dropped-files #upload-button .delete {
	padding: 7px 6px 4px 6px;
	border-radius: 100px;
	background: rgba(0,0,0,0.6);
	box-shadow: none;
	font-size: 1em;
	margin-left: 8px;
}

#dropped-files #upload-button .delete:hover {
	background: rgba(0,0,0,0.8);
}


#extra-files .number:after {
	position: absolute;
	content: " ";
	top: 18px;
	left: -40px;
	display: block;
	border: 20px solid;
	border-color: transparent rgba(0, 0, 0, 0.6) transparent transparent;
}

#extra-files #file-list {
	display: none;
	background: white;
	padding: 20px 0;
	border-radius: 5px;
	box-shadow: 0 0 15px rgba(0,0,0,0.1);
	width: 250px;
	top: 100px;
	border: 1px solid #dadada;
	left: -10px;
	left: -16px;
	max-height: 220px;
	top: 150px;
	position: absolute;
	color: #545454;
}

#file-list ul {
	overflow: scroll;
	padding: 0;
	border-top: 1px solid #dadada;
	max-height: 200px;
	width: 250px;
	list-style: none;
	border-bottom: 1px solid #dadada !important;
}


#file-list ul li:last-of-type {
	border-bottom: 0 !important;
}

#uploaded-holder {
	width: 700px;
	height: 250px;
	display: none;
	float: left;
}

#extra-files #file-list:after, #extra-files #file-list:before {
	position: absolute;
	content: " ";
	top: -40px;
	left: 40px;
	display: block;
	border: 20px solid;
	border-color: transparent transparent #ffffff transparent;
}

#extra-files #file-list:before {
	border-color: transparent transparent #dadada transparent;
	top: -41px;
}

#extra-files #file-list li {
	border-bottom: 1px solid #eee;
	font-weight: bold;
	font-size: 1.5em;
	padding: 10px;
}

#loading {
	display: none;
	float: left;
	width: 100%;
	position: relative;
}

#loading-bar {
	width: 404px;
	height: 40px;
	background: #fff;
	box-shadow: 0 0 15px rgba(0,0,0,0.1);
	border-radius: 5px;
	padding: 2px;
}

.loading-color {
	width: 0%;
	height: 100%;
	-webkit-transition: all 0.1s ease-in;
	-moz-transition: all 0.1s ease-in;
	-ms-transition: all 0.1s ease-in;
	-o-transition: all 0.1s ease-in;
	transition: all 0.1s ease-in;
	border-radius: inherit;
	background-color: #4edbf1;
}

#loading-content {
	position: absolute;
	top: 15px;
	font-size: 1.2em;
	font-weight: bold;
	text-align: center;
	width: 405px;
}

#file-name-holder {
	width: 100%;
	float: left;
}

#file-name-holder h1 {
	text-align: center;
	border-bottom: 1px solid #dadada;
	padding: 20px 0;
	font-size: 3em;
	margin: 0;
}

#uploaded-files {
	background: white;
	border-radius: 5px;
	box-shadow: 0 0 15px rgba(0,0,0,0.1);
	width: 407px;
	top: 100px;
	padding: 0;
	border: 1px solid #dadada;
	max-height: 320px;
	overflow: scroll;
	color: #545454;
}

#uploaded-files li {
	padding: 10px;
	border-bottom: 1px solid #eee;
	font-size: 1.5em;
	font-weight: bold;
	line-height: 25px;
	color: #545454;
}

#uploaded-files a {
	color: #1bacbf;
}