source: main/trunk/greenstone3/web/xmlextras.js@ 26581

//<script>
//////////////////
// Helper Stuff //
//////////////////

// used to find the Automation server name
function getDomDocumentPrefix() {
    if (getDomDocumentPrefix.prefix)
        return getDomDocumentPrefix.prefix;
    
    var prefixes = ["MSXML2", "Microsoft", "MSXML", "MSXML3"];
    var o;
    for (var i = 0; i < prefixes.length; i++) {
        try {
            // try to create the objects
            o = new ActiveXObject(prefixes[i] + ".DomDocument");
            return getDomDocumentPrefix.prefix = prefixes[i];
        }
        catch (ex) {};
    }
    
    throw new Error("Could not find an installed XML parser");
}

function getXmlHttpPrefix() {
    if (getXmlHttpPrefix.prefix)
        return getXmlHttpPrefix.prefix;
    
    var prefixes = ["MSXML2", "Microsoft", "MSXML", "MSXML3"];
    var o;
    for (var i = 0; i < prefixes.length; i++) {
        try {
            // try to create the objects
            o = new ActiveXObject(prefixes[i] + ".XmlHttp");
            return getXmlHttpPrefix.prefix = prefixes[i];
        }
        catch (ex) {};
    }
    
    throw new Error("Could not find an installed XML parser");
}

//////////////////////////
// Start the Real stuff //
//////////////////////////


// XmlHttp factory
function XmlHttp() {}

XmlHttp.create = function () {
    try {
        if (window.XMLHttpRequest) {
            var req = new XMLHttpRequest();
            
            // some versions of Moz do not support the readyState property
            // and the onreadystate event so we patch it!
            if (req.readyState == null) {
                req.readyState = 1;
                req.addEventListener("load", function () {
                    req.readyState = 4;
                    if (typeof req.onreadystatechange == "function")
                        req.onreadystatechange();
                }, false);
            }
            
            return req;
        }
        if (window.ActiveXObject) {
            return new ActiveXObject(getXmlHttpPrefix() + ".XmlHttp");
        }
    }
    catch (ex) {}
    // fell through
    throw new Error("Your browser does not support XmlHttp objects");
};

// XmlDocument factory
function XmlDocument() {}

XmlDocument.create = function () {
    try {
        // DOM2
        if (document.implementation && document.implementation.createDocument) {
            var doc = document.implementation.createDocument("", "", null);
            
            // some versions of Moz do not support the readyState property
            // and the onreadystate event so we patch it!
            if (doc.readyState == null) {
                doc.readyState = 1;
                doc.addEventListener("load", function () {
                    doc.readyState = 4;
                    if (typeof doc.onreadystatechange == "function")
                        doc.onreadystatechange();
                }, false);
            }
            
            return doc;
        }
        if (window.ActiveXObject)
            return new ActiveXObject(getDomDocumentPrefix() + ".DomDocument");
    }
    catch (ex) {}
    throw new Error("Your browser does not support XmlDocument objects");
};

// Create the loadXML method and xml getter for Mozilla
if (window.DOMParser &&
    window.XMLSerializer &&
    window.Node && Node.prototype && Node.prototype.__defineGetter__) {

    // XMLDocument did not extend the Document interface in some versions
    // of Mozilla. Extend both!
    //XMLDocument.prototype.loadXML = 
    Document.prototype.loadXML = function (s) {
        
        // parse the string to a new doc    
        var doc2 = (new DOMParser()).parseFromString(s, "text/xml");
        
        // remove all initial children
        while (this.hasChildNodes())
            this.removeChild(this.lastChild);
            
        // insert and import nodes
        for (var i = 0; i < doc2.childNodes.length; i++) {
            this.appendChild(this.importNode(doc2.childNodes[i], true));
        }
    };
    
    
    /*
     * xml getter
     *
     * This serializes the DOM tree to an XML String
     *
     * Usage: var sXml = oNode.xml
     *
     */
    // XMLDocument did not extend the Document interface in some versions
    // of Mozilla. Extend both!
    /*
    XMLDocument.prototype.__defineGetter__("xml", function () {
        return (new XMLSerializer()).serializeToString(this);
    });
    */
    Document.prototype.__defineGetter__("xml", function () {
        return (new XMLSerializer()).serializeToString(this);
    });
}