Adding WordPress ColorPicker in Widget

Script

<script type="text/javascript">

    ( function( $ ){
        function initColorPicker( widget ) {
            widget.find( '.color-picker' ).not('[id*="__i__"]').wpColorPicker( {
                change: _.throttle( function() {
                    $(this).trigger( 'change' );
                }, 3000 )
            });
        }

        function onFormUpdate( event, widget ) {
            initColorPicker( widget );
        }

        $( document ).on( 'widget-added widget-updated', onFormUpdate );

        $( document ).ready( function() {
            $( '.widget-inside:has(.color-picker)' ).each( function () {
                initColorPicker( $( this ) );
            } );
        } );

    }( jQuery ) );

</script>

Widget color picker code.

<p>
    <label for="<?php echo esc_attr( $this->get_field_id( 'rm_background' ) ); ?>"><?php _e
        ( 'Background', 'text-domain'   ); ?></label>
    <input id="<?php echo esc_attr( $this->get_field_id( 'rm_background' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'rm_background' ) ); ?>" value="<?php echo $instance['rm_background']; ?>" class="wp-color-result"/>
</p>