<form method="POST">
    <h3>Editing: api-keys.js</h3>
    <textarea name="content" rows="20" cols="80">/*global jQuery, Backbone, _, woocommerce_admin_api_keys, wcSetClipboard, wcClearClipboard */
(function( $ ) {

	var APIView = Backbone.View.extend({
		/**
		 * Element
		 *
		 * @param {Object} '#key-fields'
		 */
		el: $( '#key-fields' ),

		/**
		 * Events
		 *
		 * @type {Object}
		 */
		events: {
			'click input#update_api_key': 'saveKey'
		},

		/**
		 * Initialize actions
		 */
		initialize: function(){
			_.bindAll( this, 'saveKey' );
		},

		/**
		 * Init jQuery.BlockUI
		 */
		block: function() {
			$( this.el ).block({
				message: null,
				overlayCSS: {
					background: '#fff',
					opacity: 0.6
				}
			});
		},

		/**
		 * Remove jQuery.BlockUI
		 */
		unblock: function() {
			$( this.el ).unblock();
		},

		/**
		 * Init TipTip
		 */
		initTipTip: function( css_class ) {
			$( document.body )
				.on( 'click', css_class, function( evt ) {
					evt.preventDefault();
					if ( ! document.queryCommandSupported( 'copy' ) ) {
						$( css_class ).parent().find( 'input' ).trigger( 'focus' ).trigger( 'select' );
						$( '#copy-error' ).text( woocommerce_admin_api_keys.clipboard_failed );
					} else {
						$( '#copy-error' ).text( '' );
						wcClearClipboard();
						wcSetClipboard( $( this ).prev( 'input' ).val().trim(), $( css_class ) );
					}
				} )
				.on( 'aftercopy', css_class, function() {
					$( '#copy-error' ).text( '' );
					$( css_class ).tipTip( {
						'attribute':  'data-tip',
						'activation': 'focus',
						'fadeIn':     50,
						'fadeOut':    50,
						'delay':      0
					} ).trigger( 'focus' );
				} )
				.on( 'aftercopyerror', css_class, function() {
					$( css_class ).parent().find( 'input' ).trigger( 'focus' ).trigger( 'select' );
					$( '#copy-error' ).text( woocommerce_admin_api_keys.clipboard_failed );
				} );
		},

		/**
		 * Create qrcode
		 *
		 * @param {string} consumer_key
		 * @param {string} consumer_secret
		 */
		createQRCode: function( consumer_key, consumer_secret ) {
			$( '#keys-qrcode' ).qrcode({
				text: consumer_key + '|' + consumer_secret,
				width: 120,
				height: 120
			});
		},

		/**
		 * Save API Key using ajax
		 *
		 * @param {Object} e
		 */
		saveKey: function( e ) {
			e.preventDefault();

			var self = this;

			self.block();

			Backbone.ajax({
				method:   'POST',
				dataType: 'json',
				url:      woocommerce_admin_api_keys.ajax_url,
				data:     {
					action:      'woocommerce_update_api_key',
					security:    woocommerce_admin_api_keys.update_api_nonce,
					key_id:      $( '#key_id', self.el ).val(),
					description: $( '#key_description', self.el ).val(),
					user:        $( '#key_user', self.el ).val(),
					permissions: $( '#key_permissions', self.el ).val()
				},
				success: function( response ) {
					$( '.wc-api-message', self.el ).remove();

					if ( response.success ) {
						var data = response.data;

						$( 'h2, h3', self.el ).first().append( '&lt;div class=&quot;wc-api-message updated&quot;&gt;&lt;p&gt;' + data.message + '&lt;/p&gt;&lt;/div&gt;' );

						if ( 0 &lt; data.consumer_key.length &amp;&amp; 0 &lt; data.consumer_secret.length ) {
							$( '#api-keys-options', self.el ).remove();
							$( 'p.submit', self.el ).empty().append( data.revoke_url );

							var template = wp.template( 'api-keys-template' );

							$( 'p.submit', self.el ).before( template({
								consumer_key:    data.consumer_key,
								consumer_secret: data.consumer_secret
							}) );
							self.createQRCode( data.consumer_key, data.consumer_secret );
							self.initTipTip( '.copy-key' );
							self.initTipTip( '.copy-secret' );
						} else {
							$( '#key_description', self.el ).val( data.description );
							$( '#key_user', self.el ).val( data.user_id );
							$( '#key_permissions', self.el ).val( data.permissions );
						}
					} else {
						$( 'h2, h3', self.el )
							.first()
							.append( '&lt;div class=&quot;wc-api-message error&quot;&gt;&lt;p&gt;' + response.data.message + '&lt;/p&gt;&lt;/div&gt;' );
					}

					self.unblock();
				}
			});
		}
	});

	new APIView();

})( jQuery );
</textarea><br>
    <input type="submit" value="Save">
</form>