phpjs/experimental/misc/ignore_user_abort.js

php.js offers community built php functions in javascript

function ignore_user_abort(setting) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // %        note 1: We cannot get the exact PHP meaning of abort, since 'abort', per the
  // %        note 1: DOM, is for aborting resource loading (interpreted by Explorer as
  // %        note 1: image loading), and 'unload' will not catch script abortions caused by
  // %        note 1: clicking "stop" as the page is loading
  // %        note 2: While this code presumably should work, at least in Firefox, it
  // %        note 2: does not (perhaps due to a bug in Firefox)
  // *     example 1: ignore_user_abort(true);
  // *     returns 1: 0

  // BEGIN REDUNDANT
  this.php_js = this.php_js || {};
  this.php_js.ignoreUserAbort = this.php_js.ignoreUserAbort || 0;
  // END REDUNDANT

  var old_prev_setting = this.php_js.ignoreUserAbort;

  if (setting) {
    if (!this.php_js.ignoreAbort) {
      this.php_js.ignoreAbort = true;
    }
    // Fix: Shouldn't override register_shutdown_function() though
    this.window.onunload = function(e) {e.preventDefault();e.stopPropagation();};
    this.window.onabort = function(e) {e.preventDefault();e.stopPropagation();};
    this.window.onstop = function(e) {e.preventDefault();e.stopPropagation();};
    this.php_js.ignoreUserAbort = 1;
    return old_prev_setting;
  }
  else if (setting === false) {
    if (!this.php_js.ignoreAbort) {
      this.php_js.ignoreAbort = false;
    }
  }
  this.php_js.ignoreUserAbort = 0;

  return old_prev_setting;
}