A sample WordPress plugin that demonstrates a custom text field type for Admin Page Framework.

admin-page-framework-custom-text-field-type.php

<?php
/**
 * Plugin Name: Admin Page Framework - Custom Text Field TYpe
 */ 

function loadAPFCustomTextFieldType() {

    if ( ! class_exists( 'AdminPageFramework' ) ) {
        return;
    }

    include( dirname( __FILE__ ) . '/CustomTextFieldType.php' );
    include( dirname( __FILE__ ) . '/APF_CustomTextFieldType.php' );
    
    // Register the field type
    new CustomTextFieldType( 'APF_CustomTextFieldType' );
    
    // Create an admin page
    new APF_CustomTextFieldType;	

}
add_action( 'plugins_loaded', 'loadAPFCustomTextFieldType' );

APF_CustomTextFieldType.php

<?php
class APF_CustomTextFieldType extends AdminPageFramework {

    public function setUp() {

        $this->setRootMenuPage( 'Sample' );    // where to belong
        $this->addSubMenuItem(
            array(
                'title'        => __( 'Custom Text Field Type', 'admin-page-framework-demo-custom-field-type' ),    // page and menu title
                'page_slug'    => 'apf_custom_text_field_type'    // page slug
            )
        );
        
        $this->addSettingFields(
            // 'sbutmit_hooks',    // the target section ID
            array(    
                'field_id'      => 'my_text_field',
                'title'      => __( 'Example', 'admin-page-framework-demo-custom-field-type' ),
                'type'          => 'custom_text',  
            )
        );
        
    }            
            
    /**
     * Do something in the page.
     * 
     * @callback    filter      do_{page slug}
     */
    public function do_apf_custom_text_field_type() {
        submit_button();
    }
                    
}

CustomTextFieldType.php

<?php
class CustomTextFieldType extends AdminPageFramework_FieldType_text {
		
	/**
	 * Defines the field type slugs used for this field type.
	 */
	public $aFieldTypeSlugs = array( 'custom_text', );
	
    protected function getScripts() {

        return 
        "jQuery( document ).ready( function(){
            jQuery( 'input[type=text][data-type=custom-text]' ).each( function() {
                jQuery( this ).get( 0 ).scrollLeft = jQuery( this ).get( 0 ).scrollWidth;
            });
        });";            
     
    }
            
	/**
	 * Returns the output of the field type.
     * 
     * @return      string
	 */
	protected function getField( $aField ) {
        
        $aField[ 'attributes' ][ 'type' ] = 'text';
        $aField[ 'attributes' ][ 'data-type' ] = 'custom-text';
        $aField[ 'attributes' ][ 'autofocus'  ] = '';
        
        return parent::getField( $aField );
        
    }
	
}