Check if CDF is empty

Check if the specified CDF document is empty.

Originally contributed by Kartik Sarangi

Modified Version

/* 
 * Method to check if a Document or Document associated with a CDF control is empty or not.
 *@param object (Object) jsx3.app.Server or class that implements jsx3.xml.CDF
 *@param strCDF {String} Cache ID of document stored in application Cache
 *@return boolean
*/
  isDocEmpty = function(object, strCDF) {    
    var objXML = null;
    if (object.instanceOf(jsx3.app.Server) ) 
      objXML = object.getCache().getDocument(strCDF);
    if (object.instanceOf(jsx3.xml.CDF) ) 
      objXML = object.getXML();
    return (objXML === null || (objXML.getFirstChild() === null));
  };

Short version for in-line code.

//var objXML = matrix1.getXML();
var isDocEmpty = (objXML && objXML.getFirstChild() == null);

Or with additional check for asynch loaded document

// async loaded document with error is considered empty
var isDocEmpty = (objXML && !objXML.hasError() && objXML.getFirstChild() == null);

Check if CDF is empty

Check if the specified CDF document is empty.

Short version for in-line code.

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