how to add multi select category in visual composer

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How can I add a multi-selector for the Visual composer?

vc_map( array(
"name" => esc_html__("Ajax Posts", '7mag'),
"base" => "YT_ajaxpost",
"icon" => "YT_vc_ico_ajaxpost",
"class" => "YT_vc_sc_ajaxpost",
"category" => esc_html__("7mag", '7mag'),
"params"    => array(
array(
        "type" => "dropdown",
        "heading" => esc_html__("Style", '7mag'),
        "param_name" => "multiple",
        "value" => $categories_array,
    ),
) );

For example: link

2 Answers

I've updated the above solution. due to $value!=='' check the values were not being selected after save.

function dropdown_multi_settings_field( $param, $value ) {
    if ( ! is_array( $value ) ) {
        $param_value_arr = explode( ',', $value );
    } else {
        $param_value_arr = $value;
    }

    $param_line  = '';
    $param_line .= '<select multiple name="' . esc_attr( $param['param_name'] ) . '" class="wpb_vc_param_value wpb-input wpb-select ' . esc_attr( $param['param_name'] ) . ' ' . esc_attr( $param['type'] ) . '">';
    foreach ( $param['value'] as $text_val => $val ) {
        if ( is_numeric( $text_val ) && ( is_string( $val ) || is_numeric( $val ) ) ) {
            $text_val = $val;
        }
        $selected = '';
        if ( ! empty( $param_value_arr ) && in_array( $val, $param_value_arr ) ) {
            $selected = ' selected="selected"';
        }
        $param_line .= '<option class="' . $val . '" value="' . $val . '"' . $selected . '>' . $text_val . '</option>';
    }
    $param_line .= '</select>';

    return $param_line;
}
vc_add_shortcode_param( 'dropdown_multi', 'dropdown_multi_settings_field' );
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