source: branches/gdl-frontend/src/ajax/javascripts/create.js

//+-----------------------------------------------------------------------------
//+  Isidorus
//+  (c) 2008-2010 Marc Kuester, Christoph Ludwig, Lukas Georgieff
//+
//+  Isidorus is freely distributable under the LLGPL license.
//+  This ajax module uses the frameworks PrototypeJs and Scriptaculous, both
//+  are distributed under the MIT license.
//+  You can find a detailed description in trunk/docs/LLGPL-LICENSE.txt, and
//+  trunk/docs/LGPL-LICENSE.txt in
//+  trunk/src/ajax/javascripts/external/MIT-LICENSE.txt.
//+-----------------------------------------------------------------------------

// --- Creates the "create"-sub-page.
function makeCreate(psi)
{
    var content = new Element("div", {"class" : CLASSES.content()});
    var header = new Element("h1").update("Create a Topic");
    content.insert({"bottom" : header});
    $(CLASSES.subPage()).insert({"bottom" : content});

    try{
        var fragmentFrame = new Element("ul", {"class" : CLASSES.fragmentFrame()});
        content.insert({"bottom" : fragmentFrame});
        var liTopicSelect = new Element("li", {"class" : CLASSES.instanceOfFrame()});
        fragmentFrame.insert({"bottom" : liTopicSelect});

        function innerMakeFragment(psis, constraints){
            makeFragment(liTopicSelect, psis, constraints, null);
        }

        function onSuccessHandler(xhr){
            var json = null;
            try{
                json = xhr.responseText.evalJSON();
            }
            catch(innerErr){
                alert("Got bad JSON data from " + xhr.request.url + "\n\n" + innerErr);
            }
            var instanceOf = null;
            try{
                if(json === null){
                    var err = new Element("div", {"class" : CLASSES.error()}).update("There exist no valid topic types!<br/>Please update the TMCL-model.");
                    liTopicSelect.insert({"bottom" : err});   
                }
                else {
                        instanceOf = new InstanceOfC(json.flatten().sort(), innerMakeFragment, psi);
                    liTopicSelect.insert({"bottom" : instanceOf.getFrame()});
                }
            }
            catch(innerErr){
                alert("There occurred an error by creating an InstanceOfC frame, please reload this page!\n\n" + innerErr);
            }
        } //onSuccessHandler
        
        getPsis(onSuccessHandler, null, {"types" : true});
    }catch(err){
        alert("From makeCreate(): " + err);
    }
}


// --- Creates the sub-elemts Topic, Associations and Topic Maps ID of a Fragment element.
function makeFragment(context, psis, constraints, contents){
    clearFragment();

    var topicContent = null;
    var associationsContent = null;
    var tmContent = null;
    if(contents){
        topicContent = contents.topic;
        associationsContent = contents.associations;
        tmContent = contents.tmIds;
    }
    
    var instanceOfs = new Array();
    for(var i = 0; psis && i !== psis.length; ++i){
        instanceOfs.push(new Array(psis[i]));
    }
    if(contents) {
        if(topicContent) instanceOfs = topicContent.instanceOfs;
        else instanceOfs = new Array();
    }
    var topic = new TopicC(topicContent, (constraints ? constraints.topicConstraints : null), instanceOfs);
    var liT = new Element("li", {"class" : CLASSES.topicFrame()}).update(topic.getFrame());
    context.insert({"after" : liT});
    
    var liA = null;
    var associations = null;
    if((constraints && constraints.associationsConstraints && constraints.associationsConstraints.length !== 0) || associationsContent && associationsContent.length !== 0){
        addTopicAsPlayer((constraints ? constraints.associationsConstraints : null), topic.getContent().instanceOfs);
        associations = new AssociationContainerC(associationsContent, (constraints ? constraints.associationsConstraints : null));
        liA = new Element("li", {"class" : CLASSES.associationContainer()}).update(associations.getFrame());
        liT.insert({"after" : liA});
    }
    else {
        liA = liT;
    }
    
    var tmId = new TmIdC(tmContent);
    var liTm = new Element("li", {"class" : CLASSES.tmIdFrame()}).update(tmId.getFrame());
    liA.insert({"after" : liTm});

    // --- validates the data if there is any content
    if(contents){
        topic.isValid();
        if(associations) associations.isValid();
        tmId.isValid();
    }

    var validateButton = new Element("input", {"type" : "button", "value" : "validate fragment"});
    validateButton.observe("click", function(event){
        var ret = true;
        if(topic.isValid() === false) ret = false;
        if(associations && associations.isValid() === false) ret = false;
        if(tmId.isValid() === false) ret = false;

        if(ret === true) alert("Fragment is valid!");
        else alert("Fragment is not valid!");
    }); 

    var commitButton = new Element("input", {"type" : "button", "value" : "commit fragment"})
    commitButton.observe("click", function(event){
        // --- validates the given data
        var ret = true;
        if(topic.isValid() === false) ret = false;
        if(associations && associations.isValid() === false) ret = false;
        if(tmId.isValid() === false) ret = false;

        if(ret === false){
            alert("The fragment wasn't committed - Please correct your input data!");
            return;
        }


        // --- if the validation succeeded the fragment will be sent to the server
        var tPsis = topic.getContent().subjectIdentifiers;
        if(!tPsis || tPsis.length === 0) tPsis = "null";
        else tPsis = tPsis.toJSON()
        var referencedTopics = topic.getReferencedTopics();
        if(associations){
            var ePsis = null;
            if(contents && contents.topic && contents.topic.subjectIdentifiers && contents.topic.subjectIdentifiers.length !== 0){
                ePsis = contents.topic.subjectIdentifiers;
            }

            var aStubs = associations.getReferencedTopics();
            if(aStubs && aStubs.length !== 0){
                aStubs = aStubs.without(CURRENT_TOPIC).uniq();
                for(var i = 0; ePsis && i !== ePsis.length; ++i) aStubs = aStubs.without(ePsis[i]);
            }
            referencedTopics = referencedTopics.concat(aStubs);
        }


        function onSuccessHandler(topicStubs){
            var tsStr = "null";
            if(topicStubs && topicStubs.length !== 0){
                tsStr = "[";
                for(var i = 0; i !== topicStubs.length; ++i){
                    tsStr += topicStubs[i];
                    if(i !== topicStubs.length - 1) tsStr += ",";
                }
                tsStr += "]";
            }
    
            var jTopic = "\"topic\":" + topic.toJSON();
            var jTopicStubs = "\"topicStubs\":" + tsStr;
            var jAssociations = "\"associations\":" + (associations ? associations.toJSON().gsub("\\[\"" + CURRENT_TOPIC_ESCAPED + "\"\\]", tPsis) : "null");
            var jTmId = "\"tmIds\":" + tmId.toJSON();
            var json = "{" + jTopic + "," + jTopicStubs + "," + jAssociations + "," + jTmId + "}";

            commitFragment(json, function(xhr){ alert("The fragment was committed succesfully!"); }, null);
        }
                
        function onErrorHandler(){
            // --- currently there is not needed a special handling for errors
            // --- occurring during this operation
        }
        getTopicStubs(referencedTopics, onSuccessHandler, onErrorHandler);
    });

    var liCB = new Element("li", {"class" : CLASSES.commitButton()});
    liCB.insert({"top" : validateButton});
    liCB.insert({"top" : commitButton});
    liTm.insert({"after" : liCB});
}


// --- removes old elements from the fragment frame
function clearFragment()
{
    var items = $$("li." + CLASSES.topicFrame());
    for(var i = 0; i != items.length; ++i){
        items[i].remove();
    }
    
    items = $$("li." + CLASSES.associationContainer());
    for(var i = 0; i != items.length; ++i){
        items[i].remove();
    }
    
    items = $$("li." + CLASSES.tmIdFrame());
    for(var i = 0; i !== items.length; ++i){
        items[i].remove();
    }
    
    items = $$("li." + CLASSES.commitButton());
    for(var i = 0; i !== items.length; ++i){
        items[i].remove();
    }
}