source: trunk/workflow/js/scriptaculous/lightbox.js @ 7372

/*
Created By: Chris Campbell
Website: http://particletree.com
Date: 2/1/2006

Inspired by the lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
*/

/*-------------------------------GLOBAL VARIABLES------------------------------------*/

var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;

/*-----------------------------------------------------------------------------------------------*/

//Browser detect script origionally created by Peter Paul Koch at http://www.quirksmode.org/

function getBrowserInfo() {
        if (checkIt('konqueror')) {
                browser = "Konqueror";
                OS = "Linux";
        }
        else if (checkIt('safari')) browser     = "Safari";
        else if (checkIt('omniweb')) browser    = "OmniWeb";
        else if (checkIt('opera')) browser              = "Opera";
        else if (checkIt('webtv')) browser              = "WebTV";
        else if (checkIt('icab')) browser               = "iCab";
        else if (checkIt('msie')) browser               = "Internet Explorer";
        else if (!checkIt('compatible')) {
                browser = "Netscape Navigator";
                version = detect.charAt(8);
        }
        else browser = "An unknown browser";

        if (!version) version = detect.charAt(place + thestring.length);

        if (!OS) {
                if (checkIt('linux')) OS                = "Linux";
                else if (checkIt('x11')) OS     = "Unix";
                else if (checkIt('mac')) OS     = "Mac";
                else if (checkIt('win')) OS     = "Windows";
                else OS                                                                 = "an unknown operating system";
        }
}

function checkIt(string) {
        place = detect.indexOf(string) + 1;
        thestring = string;
        return place;
}

/*-----------------------------------------------------------------------------------------------*/

Event.observe(window, 'load', lb_initialize, false);
Event.observe(window, 'load', getBrowserInfo, false);
Event.observe(window, 'unload', Event.unloadCache, false);

var lightbox = Class.create();

lightbox.prototype = {

        yPos : 0,
        xPos : 0,

        initialize: function(ctrl) {
                this.content = ctrl.onclick;
                Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
                ctrl.onclick = function(){return false;};
        },
        
        // Turn everything on - mainly the IE fixes
        activate: function(){
                if (browser == 'Internet Explorer'){
                        this.getScroll();
                        this.prepareIE('100%', 'hidden');
                        this.setScroll(0,0);
                        this.hideSelects('hidden');
                }
                this.displayLightbox("block");
        },
        
        // Ie requires height to 100% and overflow hidden or else you can scroll down past the lightbox
        prepareIE: function(height, overflow){
                bod = document.getElementsByTagName('body')[0];
                bod.style.height = height;
                bod.style.overflow = overflow;
  
                htm = document.getElementsByTagName('html')[0];
                htm.style.height = height;
                htm.style.overflow = overflow; 
        },
        
        // In IE, select elements hover on top of the lightbox
        hideSelects: function(visibility){
                selects = document.getElementsByTagName('select');
                for(i = 0; i < selects.length; i++) {
                        selects[i].style.visibility = visibility;
                }
        },
        
        // Taken from lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
        getScroll: function(){
                if (self.pageYOffset) {
                        this.yPos = self.pageYOffset;
                } else if (document.documentElement && document.documentElement.scrollTop){
                        this.yPos = document.documentElement.scrollTop; 
                } else if (document.body) {
                        this.yPos = document.body.scrollTop;
                }
        },
        
        setScroll: function(x, y){
                window.scrollTo(x, y); 
        },
        
        displayLightbox: function(display){
                $('overlay').style.display = display;
                $('lightbox').style.display = display;
                if(display != 'none') this.processInfo();
        },
        
        // Begin Ajax request based off of the href of the clicked linked
        loadInfo: function() {
                var myAjax = new Ajax.Request(
        this.content,
        {method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
                );
                
        },
        
        // Display Ajax response
        processInfo: function(response){
                info = "<div id='lbContent'></div>";
                new Insertion.Before($('lbLoadMessage'), info);

                if (typeof(this.content) == "function") 
                {
                        this.content();
                }
                else
                {
                        this.content;
                }

                $('lightbox').className = "done";
                //this.actions();
        },
        
        // Search through new links within the lightbox, and attach click event
        /*
        actions: function(){
                lbActions = document.getElementsByClassName('lbAction');

                for(i = 0; i < lbActions.length; i++) {
                        Event.observe(lbActions[i], 'click', this[lbActions[i].rel].bindAsEventListener(this), false);
                        lbActions[i].onclick = function(){return false;};
                }
        },
*/
        
        // Example of creating your own functionality once lightbox is initiated
        insert: function(e){
           link = Event.element(e).parentNode;
           Element.remove($('lbContent'));
         
           var myAjax = new Ajax.Request(
                          link.href,
                          {method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
           );
         
        },
        
        // Example of creating your own functionality once lightbox is initiated
        deactivate: function(){
                Element.remove($('lbContent'));
                
                if (browser == "Internet Explorer"){
                        this.setScroll(0,this.yPos);
                        this.prepareIE("auto", "auto");
                        this.hideSelects("visible");
                }
                
                this.displayLightbox("none");
        }
};

/*-----------------------------------------------------------------------------------------------*/

// Onload, make all links that need to trigger a lightbox active
function lb_initialize(){
        if (!$('overlay'))
                addLightboxMarkup();
        
        lbox = document.getElementsByClassName('lbOn');

        for(i = 0; i < lbox.length; i++) {
                valid = new lightbox(lbox[i]);
        }
}

// Add in markup necessary to make this work. Basically two divs:
// Overlay holds the shadow
// Lightbox is the centered square that the content is put into.
function addLightboxMarkup() {
        bod                             = document.getElementsByTagName('body')[0];
        overlay                         = document.createElement('div');
        overlay.id                      = 'overlay';
        lb                                      = document.createElement('div');
        lb.id                           = 'lightbox';
        lb.className            = 'loading';
        lb.innerHTML            = '<div id="lbLoadMessage">' +
                                                  '<p>Loading</p>' +
                                                  '</div>';

        bod.appendChild(overlay);
        bod.appendChild(lb);
}