// $Id: drupal.js,v 1.29.2.2 2008/08/13 18:12:23 drumm Exp $



var Drupal = Drupal || {};



/**

 * Set the variable that indicates if JavaScript behaviors should be applied

 */

Drupal.jsEnabled = document.getElementsByTagName && document.createElement && document.createTextNode && document.documentElement && document.getElementById;



/**

 * Extends the current object with the parameter. Works recursively.

 */

Drupal.extend = function(obj) {

  for (var i in obj) {

    if (this[i]) {

      Drupal.extend.apply(this[i], [obj[i]]);

    }

    else {

      this[i] = obj[i];

    }

  }

};



/**

 * Redirects a button's form submission to a hidden iframe and displays the result

 * in a given wrapper. The iframe should contain a call to

 * window.parent.iframeHandler() after submission.

 */

Drupal.redirectFormButton = function (uri, button, handler) {

  // Trap the button

  button.onmouseover = button.onfocus = function() {

    button.onclick = function() {

      // Create target iframe

      Drupal.createIframe();



      // Prepare variables for use in anonymous function.

      var button = this;

      var action = button.form.action;

      var target = button.form.target;



      // Redirect form submission to iframe

      this.form.action = uri;

      this.form.target = 'redirect-target';



      handler.onsubmit();



      // Set iframe handler for later

      window.iframeHandler = function () {

        var iframe = $('#redirect-target').get(0);

        // Restore form submission

        button.form.action = action;

        button.form.target = target;



        // Get response from iframe body

        try {

          response = (iframe.contentWindow || iframe.contentDocument || iframe).document.body.innerHTML;

          // Firefox 1.0.x hack: Remove (corrupted) control characters

          response = response.replace(/[\f\n\r\t]/g, ' ');

          if (window.opera) {

            // Opera-hack: it returns innerHTML sanitized.

            response = response.replace(/"/g, '"');

          }

        }

        catch (e) {

          response = null;

        }



        response = Drupal.parseJson(response);

        // Check response code

        if (response.status == 0) {

          handler.onerror(response.data);

          return;

        }

        handler.oncomplete(response.data);



        return true;

      }



      return true;

    }

  }

  button.onmouseout = button.onblur = function() {

    button.onclick = null;

  }

};



/**

 * Retrieves the absolute position of an element on the screen

 */

Drupal.absolutePosition = function (el) {

  var sLeft = 0, sTop = 0;

  var isDiv = /^div$/i.test(el.tagName);

  if (isDiv && el.scrollLeft) {

    sLeft = el.scrollLeft;

  }

  if (isDiv && el.scrollTop) {

    sTop = el.scrollTop;

  }

  var r = { x: el.offsetLeft - sLeft, y: el.offsetTop - sTop };

  if (el.offsetParent) {

    var tmp = Drupal.absolutePosition(el.offsetParent);

    r.x += tmp.x;

    r.y += tmp.y;

  }

  return r;

};



/**

 * Return the dimensions of an element on the screen

 */

Drupal.dimensions = function (el) {

  return { width: el.offsetWidth, height: el.offsetHeight };

};



/**

 *  Returns the position of the mouse cursor based on the event object passed

 */

Drupal.mousePosition = function(e) {

  return { x: e.clientX + document.documentElement.scrollLeft, y: e.clientY + document.documentElement.scrollTop };

};



/**

 * Parse a JSON response.

 *

 * The result is either the JSON object, or an object with 'status' 0 and 'data' an error message.

 */

Drupal.parseJson = function (data) {

  if ((data.substring(0, 1) != '{') && (data.substring(0, 1) != '[')) {

    return { status: 0, data: data.length ? data : 'Unspecified error' };

  }

  return eval('(' + data + ');');

};



/**

 * Create an invisible iframe for form submissions.

 */

Drupal.createIframe = function () {

  if ($('#redirect-holder').size()) {

    return;

  }

  // Note: some browsers require the literal name/id attributes on the tag,

  // some want them set through JS. We do both.

  window.iframeHandler = function () {};

  var div = document.createElement('div');

  div.id = 'redirect-holder';

  $(div).html('<iframe name="redirect-target" id="redirect-target" class="redirect" onload="window.iframeHandler();"></iframe>');

  var iframe = div.firstChild;

  $(iframe)

    .attr({

      name: 'redirect-target',

      id: 'redirect-target'

    })

    .css({

      position: 'absolute',

      height: '1px',

      width: '1px',

      visibility: 'hidden'

    });

  $('body').append(div);

};



/**

 * Delete the invisible iframe

 */

Drupal.deleteIframe = function () {

  $('#redirect-holder').remove();

};



/**

 * Freeze the current body height (as minimum height). Used to prevent

 * unnecessary upwards scrolling when doing DOM manipulations.

 */

Drupal.freezeHeight = function () {

  Drupal.unfreezeHeight();

  var div = document.createElement('div');

  $(div).css({

    position: 'absolute',

    top: '0px',

    left: '0px',

    width: '1px',

    height: $('body').css('height')

  }).attr('id', 'freeze-height');

  $('body').append(div);

};



/**

 * Unfreeze the body height

 */

Drupal.unfreezeHeight = function () {

  $('#freeze-height').remove();

};



/**

 * Wrapper to address the mod_rewrite url encoding bug

 * (equivalent of drupal_urlencode() in PHP).

 */

Drupal.encodeURIComponent = function (item, uri) {

  uri = uri || location.href;

  item = encodeURIComponent(item).replace(/%2F/g, '/');

  return (uri.indexOf('?q=') != -1) ? item : item.replace(/%26/g, '%2526').replace(/%23/g, '%2523').replace(/\/\//g, '/%252F');

};



// Global Killswitch on the <html> element

if (Drupal.jsEnabled) {

  $(document.documentElement).addClass('js');

}