// $Id: drupal.js,v 1.29.2.1 2007/07/15 23:07:06 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.className = 'js';
}