sarissa.js

很棒的在线教学系统

        }//if(window.XMLDocument)
        else if(document.implementation && document.implementation.hasFeature && document.implementation.hasFeature('LS', '3.0')){
            Document.prototype.async = true;
            Document.prototype.onreadystatechange = null;
            Document.prototype.parseError = 0;
            Document.prototype.load = function(sURI) {
                var parser = document.implementation.createLSParser(this.async ? document.implementation.MODE_ASYNCHRONOUS : document.implementation.MODE_SYNCHRONOUS, null);
                if(this.async){
                    var self = this;
                    parser.addEventListener("load", 
                        function(e) { 
                            self.readyState = 4;
                            Sarissa.copyChildNodes(e.newDocument, self.documentElement, false);
                            self.onreadystatechange.call(); 
                        }, 
                        false); 
                };
                try {
                    var oDoc = parser.parseURI(sURI);
                }
                catch(e){
                    this.parseError = -1;
                };
                if(!this.async)
                   Sarissa.copyChildNodes(oDoc, this.documentElement, false);
                return oDoc;
            };
            /**
            * <p>Factory method to obtain a new DOM Document object</p>
            * @argument sUri the namespace of the root node (if any)
            * @argument sUri the local name of the root node (if any)
            * @returns a new DOM Document
            */
            Sarissa.getDomDocument = function(sUri, sName){
                return document.implementation.createDocument(sUri?sUri:"", sName?sName:"", null);
            };        
        };
    };//if(_SARISSA_HAS_DOM_CREATE_DOCUMENT)
};
//==========================================
// Common stuff
//==========================================
if(!window.DOMParser){
    /*
    * DOMParser is a utility class, used to construct DOMDocuments from XML strings
    * @constructor
    */
    DOMParser = function() {
    };
    if(_SARISSA_IS_SAFARI){
        /** 
        * Construct a new DOM Document from the given XMLstring
        * @param sXml the given XML string
        * @param contentType the content type of the document the given string represents (one of text/xml, application/xml, application/xhtml+xml). 
        * @return a new DOM Document from the given XML string
        */
        DOMParser.prototype.parseFromString = function(sXml, contentType){
            if(contentType.toLowerCase() != "application/xml"){
                throw "Cannot handle content type: \"" + contentType + "\"";
            };
            var xmlhttp = new XMLHttpRequest();
            xmlhttp.open("GET", "data:text/xml;charset=utf-8," + encodeURIComponent(str), false);
            xmlhttp.send(null);
            return xmlhttp.responseXML;
        };
    }else if(Sarissa.getDomDocument && Sarissa.getDomDocument() && "loadXML" in Sarissa.getDomDocument()){
        DOMParser.prototype.parseFromString = function(sXml, contentType){
            var doc = Sarissa.getDomDocument();
            doc.loadXML(sXml);
            return doc;
        };
    };
};

if(window.XMLHttpRequest){
    Sarissa.IS_ENABLED_XMLHTTP = true;
}
else if(_SARISSA_IS_IE){
    /**
     * Emulate XMLHttpRequest
     * @constructor
     */
    XMLHttpRequest = function() {
        return new ActiveXObject(_SARISSA_XMLHTTP_PROGID);
    };
    Sarissa.IS_ENABLED_XMLHTTP = true;
};

if(!window.document.importNode && _SARISSA_IS_IE){
    try{
        /**
        * Implements importNode for the current window document in IE using innerHTML.
        * Testing showed that DOM was multiple times slower than innerHTML for this,
        * sorry folks. If you encounter trouble (who knows what IE does behind innerHTML)
        * please gimme a call.
        * @param oNode the Node to import
        * @param bChildren whether to include the children of oNode
        * @returns the imported node for further use
        */
        window.document.importNode = function(oNode, bChildren){
            var importNode = document.createElement("div");
            if(bChildren)
                importNode.innerHTML = Sarissa.serialize(oNode);
            else
                importNode.innerHTML = Sarissa.serialize(oNode.cloneNode(false));
            return importNode.firstChild;
        };
        }catch(e){};
};
if(!Sarissa.getParseErrorText){
    /**
     * <p>Returns a human readable description of the parsing error. Usefull
     * for debugging. Tip: append the returned error string in a &lt;pre&gt;
     * element if you want to render it.</p>
     * <p>Many thanks to Christian Stocker for the initial patch.</p>
     * @argument oDoc The target DOM document
     * @returns The parsing error description of the target Document in
     *          human readable form (preformated text)
     */
    Sarissa.getParseErrorText = function (oDoc){
        var parseErrorText = Sarissa.PARSED_OK;
        if(oDoc && oDoc.parseError && oDoc.parseError != 0){
            /*moz*/
            if(oDoc.documentElement.tagName == "parsererror"){
                parseErrorText = oDoc.documentElement.firstChild.data;
                parseErrorText += "\n" +  oDoc.documentElement.firstChild.nextSibling.firstChild.data;
            }/*konq*/
            else{
                parseErrorText = Sarissa.getText(oDoc.documentElement);/*.getElementsByTagName("h1")[0], false) + "\n";
                parseErrorText += Sarissa.getText(oDoc.documentElement.getElementsByTagName("body")[0], false) + "\n";
                parseErrorText += Sarissa.getText(oDoc.documentElement.getElementsByTagName("pre")[0], false);*/
            };
        };
        return parseErrorText;
    };
};
Sarissa.getText = function(oNode, deep){
    var s = "";
    var nodes = oNode.childNodes;
    for(var i=0; i < nodes.length; i++){
        var node = nodes[i];
        var nodeType = node.nodeType;
        if(nodeType == Node.TEXT_NODE || nodeType == Node.CDATA_SECTION_NODE){
            s += node.data;
        }else if(deep == true
                    && (nodeType == Node.ELEMENT_NODE
                        || nodeType == Node.DOCUMENT_NODE
                        || nodeType == Node.DOCUMENT_FRAGMENT_NODE)){
            s += Sarissa.getText(node, true);
        };
    };
    return s;
};
if(window.XMLSerializer){
    /**
     * <p>Factory method to obtain the serialization of a DOM Node</p>
     * @returns the serialized Node as an XML string
     */
    Sarissa.serialize = function(oDoc){
        var s = null;
        if(oDoc){
            s = oDoc.innerHTML?oDoc.innerHTML:(new XMLSerializer()).serializeToString(oDoc);
        };
        return s;
    };
}else{
    if(Sarissa.getDomDocument && (Sarissa.getDomDocument("","foo", null)).xml){
        // see non-IE version
        Sarissa.serialize = function(oDoc) {
            var s = null;
            if(oDoc){
                s = oDoc.innerHTML?oDoc.innerHTML:oDoc.xml;
            };
            return s;
        };
        /**
         * Utility class to serialize DOM Node objects to XML strings
         * @constructor
         */
        XMLSerializer = function(){};
        /**
         * Serialize the given DOM Node to an XML string
         * @param oNode the DOM Node to serialize
         */
        XMLSerializer.prototype.serializeToString = function(oNode) {
            return oNode.xml;
        };
    };
};

/**
 * strips tags from a markup string
 */
Sarissa.stripTags = function (s) {
    return s.replace(/<[^>]+>/g,"");
};
/**
 * <p>Deletes all child nodes of the given node</p>
 * @argument oNode the Node to empty
 */
Sarissa.clearChildNodes = function(oNode) {
    // need to check for firstChild due to opera 8 bug with hasChildNodes
    while(oNode.firstChild){
        oNode.removeChild(oNode.firstChild);
    };
};
/**
 * <p> Copies the childNodes of nodeFrom to nodeTo</p>
 * <p> <b>Note:</b> The second object's original content is deleted before 
 * the copy operation, unless you supply a true third parameter</p>
 * @argument nodeFrom the Node to copy the childNodes from
 * @argument nodeTo the Node to copy the childNodes to
 * @argument bPreserveExisting whether to preserve the original content of nodeTo, default is false
 */
Sarissa.copyChildNodes = function(nodeFrom, nodeTo, bPreserveExisting) {
    if((!nodeFrom) || (!nodeTo)){
        throw "Both source and destination nodes must be provided";
    };
    if(!bPreserveExisting){
        Sarissa.clearChildNodes(nodeTo);
    };
    var ownerDoc = nodeTo.nodeType == Node.DOCUMENT_NODE ? nodeTo : nodeTo.ownerDocument;
    var nodes = nodeFrom.childNodes;
    if(ownerDoc.importNode && (!_SARISSA_IS_IE)) {
        for(var i=0;i < nodes.length;i++) {
            nodeTo.appendChild(ownerDoc.importNode(nodes[i], true));
        };
    }
    else{
        for(var i=0;i < nodes.length;i++) {
            nodeTo.appendChild(nodes[i].cloneNode(true));
        };
    };
};

/**
 * <p> Moves the childNodes of nodeFrom to nodeTo</p>
 * <p> <b>Note:</b> The second object's original content is deleted before 
 * the move operation, unless you supply a true third parameter</p>
 * @argument nodeFrom the Node to copy the childNodes from
 * @argument nodeTo the Node to copy the childNodes to
 * @argument bPreserveExisting whether to preserve the original content of nodeTo, default is
 */ 
Sarissa.moveChildNodes = function(nodeFrom, nodeTo, bPreserveExisting) {
    if((!nodeFrom) || (!nodeTo)){
        throw "Both source and destination nodes must be provided";
    };
    if(!bPreserveExisting){
        Sarissa.clearChildNodes(nodeTo);
    };
    var nodes = nodeFrom.childNodes;
    // if within the same doc, just move, else copy and delete
    if(nodeFrom.ownerDocument == nodeTo.ownerDocument){
        while(nodeFrom.firstChild){
            nodeTo.appendChild(nodeFrom.firstChild);
        };
    }else{
        var ownerDoc = nodeTo.nodeType == Node.DOCUMENT_NODE ? nodeTo : nodeTo.ownerDocument;
        if(ownerDoc.importNode && (!_SARISSA_IS_IE)) {
           for(var i=0;i < nodes.length;i++) {
               nodeTo.appendChild(ownerDoc.importNode(nodes[i], true));
           };
        }else{
           for(var i=0;i < nodes.length;i++) {
               nodeTo.appendChild(nodes[i].cloneNode(true));
           };
        };
        Sarissa.clearChildNodes(nodeFrom);
    };
};

/** 
 * <p>Serialize any object to an XML string. All properties are serialized using the property name
 * as the XML element name. Array elements are rendered as <code>array-item</code> elements, 
 * using their index/key as the value of the <code>key</code> attribute.</p>
 * @argument anyObject the object to serialize
 * @argument objectName a name for that object
 * @return the XML serializationj of the given object as a string
 */
Sarissa.xmlize = function(anyObject, objectName, indentSpace){
    indentSpace = indentSpace?indentSpace:'';
    var s = indentSpace  + '<' + objectName + '>';
    var isLeaf = false;
    if(!(anyObject instanceof Object) || anyObject instanceof Number || anyObject instanceof String 
        || anyObject instanceof Boolean || anyObject instanceof Date){
        s += Sarissa.escape(""+anyObject);
        isLeaf = true;
    }else{
        s += "\n";
        var itemKey = '';
        var isArrayItem = anyObject instanceof Array;
        for(var name in anyObject){
            s += Sarissa.xmlize(anyObject[name], (isArrayItem?"array-item key=\""+name+"\"":name), indentSpace + "   ");
        };
        s += indentSpace;
    };
    return s += (objectName.indexOf(' ')!=-1?"</array-item>\n":"</" + objectName + ">\n");
};

/** 
 * Escape the given string chacters that correspond to the five predefined XML entities
 * @param sXml the string to escape
 */
Sarissa.escape = function(sXml){
    return sXml.replace(/&/g, "&amp;")
        .replace(/</g, "&lt;")
        .replace(/>/g, "&gt;")
        .replace(/"/g, "&quot;")
        .replace(/'/g, "&apos;");
};

/** 
 * Unescape the given string. This turns the occurences of the predefined XML 
 * entities to become the characters they represent correspond to the five predefined XML entities
 * @param sXml the string to unescape
 */
Sarissa.unescape = function(sXml){
    return sXml.replace(/&apos;/g,"'")
        .replace(/&quot;/g,"\"")
        .replace(/&gt;/g,">")
        .replace(/&lt;/g,"<")
        .replace(/&amp;/g,"&");
};
//