Default option value not working automatically - php

Question

Hi expert wp plugin developers, I need help. I have apply bellow code but not working default value and not showing updated notification after clicking save button. When I put all value in option page from dashboard everything is ok. But not showing all updated notification. Please help me.
<?php
function hkhk_options() {
add_menu_page('Scrol Line Admin Settings', 'hk Settings','manage_options',
'hk_settings', 'hk_admin_options');
}
add_action('admin_menu', 'hkhk_options');
function hk_defaults()
{
$hk_options = array(
'back_color' => '#ccc',
);
}
if ( is_admin() ) :
function hk_register_settings () {
register_setting('hkhk_options', 'hk_options', 'hk_validate_options');
}
add_action('admin_init', 'hk_register_settings');
function hk_admin_options() {
global $hk_options;
if ( ! isset( $_REQUEST['updated'] ) )
$_REQUEST['updated'] = false;
?>
<div class="wrap">
<h2>Select Scrol Line Option</h2>
<?php if ( false !== $_REQUEST['updated'] ) : ?>
<div class="update fade"><p><strong><?php _e( 'Options saved' ); ?></strong></p></div>
<?php endif; // If the form has just been submitted, this shows the notification ?>
<form method="post" action="options.php">
<?php $settings=get_option ( 'hk_options', $hk_options ); ?>
<?php settings_fields('hkhk_options'); ?>
<table class="form-table">
<tr valign="top">
<th scope="row"><label for="back_color"> Back Color </label></th>
<td>
<input id="back_color" type="text" name="hk_options[back_color]" value="<?php esc_attr_e($settings['back_color']); ?>" class="wp-picker-container" /><p class="description"> Choose any color from here for background color. </p>
</td>
</tr>
</table>
<p class="submit"><input type="submit" class="button-primary" value="Save Options" /> </p>
</form>
</div>
<?php
}
function hk_validate_options( $input ){
global $hk_options;
$settings = get_option( 'hk_options', $hk_options );
$input['back_color'] = wp_filter_post_kses( $input['back_color'] );
return $input;
}
endif;
function scrol_line_active() {?>
<?php global $hk_options; $hk_settings = get_option ( 'hk_options', $hk_options ); ?>
<script type="text/javascript">
jQuery(document).ready(function($) {
jQuery("body") .hk({
backColor: "<?php echo $hk_settings['back_color']; ?>",
});
});
</script>
<?php
}
add_action ('wp_head', 'scrol_line_active');
?>

Answer 1

You are checking wrong REQUEST parameter. You need to check $_REQUEST['settings-updated'].
When option page is submitted new URL is similar to /wp-admin/admin.php?page=hk_settings&settings-updated=true.
Hope this helps.