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A PHP class that facilitates the creation of custom WordPress metaboxes

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wp-metabox-constructor-class

This is a PHP class that allows WordPress plugin developers to easily create custom Metaboxes.

Adapted from My-Meta-Box.

Demo photo

Installation

  • Download this repo as a zip file and extract its contents.
  • Move the folder inside your plugin folder.
  • Require the demo file require_once("wp-metabox-constructor-class/demo.php");

Usage

To create a metabox, first instantiate an instance of Metabox_Constructor. The class takes one argument, which is an associative array. The keys to the array are similar to the arguments provided to the add_meta_box WordPress function; however, you don't provide callback or callback_args.

$metabox = new Metabox_Constructor(array(
	'id' => 'metabox_id', // required
	'title' => 'My awesome metabox', // required
	'screen' => 'post', // required
	'context' => 'advanced',
	'priority' => 'default'
));

Available Fields

After instantiating the above metabox, add a few fields to it. Below is a list of the available fields. Click on one to see how to implement it.

Text

A simple text input. Nothing special.

$metabox->addText(array(
	'id' => 'metabox_text_field', // required
	'label' => 'Text', // required
	'desc' => 'An example description paragraph that appears below the label.'
));

Textarea

Textareas are used to store a body of text. For a richer experience with HTML, see the WYSIWYG editor.

$metabox->addTextArea(array(
	'id' => 'metabox_textarea_field', // required
	'label' => 'Textarea', // required
	'desc' => 'An example description paragraph that appears below the label.'
));

Checkbox

Checkboxes are a great way to facilitate conditional logic.

$metabox->addCheckbox(array(
	'id' => 'metabox_checkbox_field', // required
	'label' => 'Checkbox', // required
	'desc' => 'An example description paragraph that appears below the label.'
));

Radio

Radio fields are a great way to choose from a selection of options.

$metabox->addRadio(
	array(
		'id' => 'metabox_radio_field', // required
		'label' => 'Radio', // required
		'desc' => 'An example description paragraph that appears below the label.',
	),
	array( // required
		'key1' => 'Value One',
		'key2' => 'Value Two'
	)
);

Image Upload

Use this to permit users to upload an image within the metabox. Pro tip: use this with the repeater to dynamically manage the photos within a gallery or slideshow.

$metabox->addImage(array(
	'id' => 'metabox_image_field', // required
	'label' => 'Image Upload', // required
	'desc' => 'An example description paragraph that appears below the label.'
));

WYSIWYG Editor

You can use a WYSIWYG editor to facilitate the management of HTML content.

$metabox->addWysiwyg(array(
	'id' => 'metabox_wysiwyg_field', // required
	'label' => 'WYSIWYG', // required
	'desc' => 'An example description paragraph that appears below the label.'
));

Repeater

All of the above fields can be added to a repeater to store an array of content with a dynamic length. Here is an example of a repeater block with three fields: text, textarea, and image upload.

Notice: true is a second argument to the repeater fields. This is required. Also, the variable, $metabox_repeater_block_fields[], which stores the repeater block's fields, has a pair of brackets [] at the end of the variable name. This is required.

$metabox_repeater_block_fields[] = $metabox->addText(array(
	'id' => 'metabox_repeater_text_field',
	'label' => 'Photo Title'
), true);

$metabox_repeater_block_fields[] = $metabox->addTextArea(array(
	'id' => 'metabox_repeater_textarea_field',
	'label' => 'Photo Description'
), true);

$metabox_repeater_block_fields[] = $metabox->addImage(array(
	'id' => 'metabox_repeater_image_field',
	'label' => 'Upload Photo'
));

$metabox->addRepeaterBlock(array(
	'id' => 'metabox_repeater_block', // required
	'label' => 'Photo Gallery', // required
	'fields' => $metabox_repeater_block_fields, // required
	'desc' => 'Photos in a photo gallery.',
	'single_label' => 'Photo'
));

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