# Yahoo! UI Library

### connection 2.8.1

Yahoo! UI Library > connection > connection_xdr.js (source view)
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    /**
      * @for Connect
      */
    (function() {
    	var YCM = YAHOO.util.Connect, _fn = {};

       /**
        * @description This method creates and instantiates the Flash transport.
        * @method _swf
        * @private
        * @static
        * @param {string} URI to connection.swf.
        * @return {void}
        */
    	function _swf(uri) {
    		var o = '<object id="YUIConnectionSwf" type="application/x-shockwave-flash" data="' +
    		        uri + '" width="0" height="0">' +
    		     	'<param name="movie" value="' + uri + '">' +
                    '<param name="allowScriptAccess" value="always">' +
    		    	'</object>',
    		    c = document.createElement('div');

    		document.body.appendChild(c);
    		c.innerHTML = o;
    	}

       /**
        * @description This method calls the public method on the
        * Flash transport to start the XDR transaction.  It is analogous
        * to Connection Manager's asyncRequest method.
        * @method xdr
        * @private
        * @static
        * @param {object} The transaction object.
        * @param {string} HTTP request method.
        * @param {string} URI for the transaction.
        * @param {object} The transaction's callback object.
        * @param {object} The JSON object used as HTTP POST data.
        * @return {void}
        */
    	function _xdr(o, m, u, c, d) {
    		_fn[parseInt(o.tId)] = { 'o':o, 'c':c };
    		if (d) {
    			c.method = m;
    			c.data = d;
    		}

    		o.conn.send(u, c, o.tId);
    	}

       /**
        * @description This method instantiates the Flash transport and
        * establishes a static reference to it, used for all XDR requests.
        * @method transport
        * @public
        * @static
        * @param {string} URI to connection.swf.
        * @return {void}
        */
    	function _init(uri) {
    		_swf(uri);
    		YCM._transport = document.getElementById('YUIConnectionSwf');
    	}

    	function _xdrReady() {
    		YCM.xdrReadyEvent.fire();
    	}

       /**
        * @description This method fires the global and transaction start
        * events.
        * @method _xdrStart
        * @private
        * @static
        * @param {object} The transaction object.
        * @param {string} The transaction's callback object.
        * @return {void}
        */
    	function _xdrStart(o, cb) {
    		if (o) {
    			// Fire global custom event -- startEvent
    			YCM.startEvent.fire(o, cb.argument);

    			if(o.startEvent){
    				// Fire transaction custom event -- startEvent
    				o.startEvent.fire(o, cb.argument);
    			}
    		}
    	}

       /**
        * @description This method is the initial response handler
        * for XDR transactions.  The Flash transport calls this
        * function and sends the response payload.
        * @method handleXdrResponse
        * @private
        * @static
        * @param {object} The response object sent from the Flash transport.
        * @return {void}
        */
    	function _handleXdrResponse(r) {
    		var o = _fn[r.tId].o,
    			cb = _fn[r.tId].c;

    		if (r.statusText === 'xdr:start') {
    			_xdrStart(o, cb);
    			return;
    		}

    		r.responseText = decodeURI(r.responseText);
    		o.r = r;
    		if (cb.argument) {
    			o.r.argument = cb.argument;
    		}

    		this.handleTransactionResponse(o, cb, r.statusText === 'xdr:abort' ? true : false);
    		delete _fn[r.tId];
    	}

    	// Bind the functions to Connection Manager as static fields.
    	YCM.xdr = _xdr;
    	YCM.swf = _swf;
    	YCM.transport = _init;
    	YCM.xdrReadyEvent = new YAHOO.util.CustomEvent('xdrReady');
    	YCM.xdrReady = _xdrReady;
    	YCM.handleXdrResponse = _handleXdrResponse;
    })();

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