How to include checkbox in widget backend form?
Let’s see the full code of an ‘About Us’ widget using a checkbox to show/hide an avatar image:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | class about_us extends WP_Widget { function about_us() { $widget_ops = array( 'classname' => 'about_us', 'description' => __( 'About Us', 'wptheme' ) ); $this->WP_Widget( 'about_us', __( 'About Us', 'wptheme' ), $widget_ops, $control_ops ); } function widget( $args, $instance ) { extract( $args ); $title = apply_filters( 'widget_title', $instance[ 'title' ] ); $text = $instance[ 'text' ]; // The following variable is for a checkbox option type $avatar = $instance[ 'avatar' ] ? 'true' : 'false'; echo $before_widget; if ( $title ) { echo $before_title . $title . $after_title; } // Retrieve the checkbox if( 'on' == $instance[ 'avatar' ] ) : ?> <div class="about-us-avatar"> <?php echo get_avatar( get_the_author_meta( 'user_email' ), '50', '' ); ?> </div> <?php endif; ?> <div class="textwidget"> <p><?php echo esc_attr( $text ); ?></p> </div> <?php echo $after_widget; } function update( $new_instance, $old_instance ) { $instance = $old_instance; $instance[ 'title' ] = strip_tags( $new_instance[ 'title' ] ); $instance[ 'text' ] = strip_tags( $new_instance[ 'text' ] ); // The update for the variable of the checkbox $instance[ 'avatar' ] = $new_instance[ 'avatar' ]; return $instance; } function form( $instance ) { $defaults = array( 'title' => __( 'About Us', 'wptheme' ), 'avatar' => 'off' ); $instance = wp_parse_args( ( array ) $instance, $defaults ); ?> <p> <label for="<?php echo $this->get_field_id( 'title' ); ?>">Title</label> <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $instance[ 'title' ] ); ?>" /> </p> <!-- The checkbox --> <p> <input class="checkbox" type="checkbox" <?php checked( $instance[ 'avatar' ], 'on' ); ?> id="<?php echo $this->get_field_id( 'avatar' ); ?>" name="<?php echo $this->get_field_name( 'avatar' ); ?>" /> <label for="<?php echo $this->get_field_id( 'avatar' ); ?>">Show avatar</label> </p> <p> <label for="<?php echo $this->get_field_id( 'text' ); ?>">About Us</label> <textarea class="widefat" id="<?php echo $this->get_field_id( 'text' ); ?>" rows="10" cols="10" name="<?php echo $this->get_field_name( 'text' ); ?>"><?php echo esc_attr( $instance[ 'text' ] ); ?></textarea> </p> <?php } } register_widget( 'about_us' ); |
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