Bug 201236 Issue about Allow multiple and duplicate values in Layout preview[0705]
Description: Issue about Allow multiple and duplicate values in Layout preview Build number:2.2.1.v20070827 Steps to reproduce: 1. New sample data source and dataset from CUSTOMERS. 2. New a parameter p1, listbox, dynamic, value field COUNTRY, tick on allow duplicate value, tick on allow multiple values. 3. Insert a data item to Layout, set expression as var values=""; for (i=0;i<params["p1"].value.length;i++) values=values+params["p1"].value[i]+"."; values; 4. In Layout, click Preview and select France. Expected result: Display one France. Actual result: Display several France. I tried the same action but preview in Web viewer and extenal html, the result is only one France. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/taglib/ParamDefTag.java
String containerId = encParamId + "_container"; 		
		String displayTextName = ParameterAccessor.PREFIX_DISPLAY_TEXT
				+ encParamName;
		
		writer.write( "\n<script language=\"JavaScript\">\n" ); 
		writer.write( "function handleParam" + encParamId + "( oCtl )\n" ); 
		writer.write( "{\n" ); 
		writer.write( "  if( !oCtl ) return;\n" ); 
		writer
				.write( "  var container = document.getElementById(\"" + containerId + "\");\n" ); 
		writer.write( " while( container.childNodes.length > 0)\n" ); 
		writer.write( "{\n" ); 
		writer.write( "  container.removeChild(container.firstChild);\n" ); 		
		writer.write( "}\n" ); 
		writer.write( "\n" ); 
		writer.write( "  var options = oCtl.options;\n" ); 			
		writer.write( "  for( var i = 0; i < options.length; i++ )\n" ); 
		writer.write( "  {\n" ); 
		writer.write( "    if( !options[i].selected ) continue;\n" ); 
		writer.write( "\n" ); 
		writer.write( "    var text = options[i].text;\n" ); 
		writer.write( "    var value = options[i].value;\n" ); 
		
		writer.write( "\n" ); 
		writer
				.write( "  if( value == '' && text == '" + IBirtConstants.NULL_VALUE + "')\n" ); 
		writer.write( "    {\n" ); 
		writer
				.write( "      var oInput = document.createElement( 'input' );\n" ); 
		writer.write( "      oInput.type = 'hidden';\n" );