Can you really problem publish demands from WordPress sidebar?

I wish to open page wich requires some parameters to become sent by POST request. However I discovered that neither FORM tag, not JAVASCRIPT or ONCLICK syntax isn't permitted in text widget in sidebar.

Is in whatever way to do this?

Thanks

UPDATE 1

I'm around the free account using blogging platforms.

You might want to make your own wordpress plugin and widget with this. You can output the shape and input tags in your widget.

Within the example below, you can output the shape within the "widget" function. For instance, you can produce a directory inside your plug ins directory and title it foo, then produce a php file known as foo.php and employ code like the following:

<?php
/*
Plugin Name: Name Of The Plugin
Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
Description: A brief description of the Plugin.
Version: The Plugin's Version Number, e.g.: 1.0
Author: Name Of The Plugin Author
Author URI: http://URI_Of_The_Plugin_Author
License: A "Slug" license name e.g. GPL2
*/

    /**
     * Foo_Widget Class
     */
    class Foo_Widget extends WP_Widget {
        /** constructor */
        function __construct() {
            parent::WP_Widget( /* Base ID */'foo_widget', /* Name */'Foo_Widget', array( 'description' => 'A Foo Widget' ) );
        }
    /** @see WP_Widget::widget */
    function widget( $args, $instance ) {
        extract( $args );
        $title = apply_filters( 'widget_title', $instance['title'] );
        echo $before_widget;
        if ( $title )
            echo $before_title . $title . $after_title; ?>
        <form action="" method="post">
                    <input type="text" name="mytext" />
            <input type="text" name="result" value="<?php echo isset($_POST['mytext']) ? $_POST['mytext'] : ''; ?>" />
<input type="submit" name="submitbutton" value="Submit" /> </form>
        <?php echo $after_widget;
    }

    /** @see WP_Widget::update */
    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $instance['title'] = strip_tags($new_instance['title']);
        return $instance;
    }

    /** @see WP_Widget::form */
    function form( $instance ) {
        if ( $instance ) {
            $title = esc_attr( $instance[ 'title' ] );
        }
        else {
            $title = __( 'New title', 'text_domain' );
        }
        ?>
        <p>
        <label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('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 $title; ?>" />
        </p>
        <?php 
    }

    } // class Foo_Widget
    // register Foo_Widget widget
    add_action( 'widgets_init', create_function( '', 'register_widget("Foo_Widget");' ) );
?>

Are you currently searching to prevent editing web site code?

Otherwise, then you definitely should have the ability to open sidebar.php out of your Wordpress theme directory also it it directly inside.