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
{
		JspWriter writer = pageContext.getOut( );
		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );
		Boolean bl = (Boolean) param.getValue( );
		boolean value = bl != null ? bl.booleanValue( ) : false;
		
		String valueId = encParamId + "_value"; 
		writer.write( "<input type=\"hidden\" " ); 
		writer.write( " id=\"" + valueId + "\" " ); 
		writer.write( " name=\"" + encParamName + "\" " ); 
		writer
				.write( " value=\"" + ParameterAccessor.htmlEncode( this.valueString ) + "\" " );  
		writer.write( " >\n" ); 
		String valCtl = "document.getElementById('" + valueId + "')"; 
		String inputCtl = "document.getElementById('" + encParamId + "')"; 
		String onClick = "var value = 'false';if( " + inputCtl + ".checked ) value='true';" + valCtl + ".value = value;"; 
		writer.write( "<input type=\"checkbox\" " ); 
		if ( param.getId( ) != null )
			writer.write( " id=\"" + encParamId + "\"" ); 
		__handleGeneralDefinition( );
		writer.write( " onclick=\"" + onClick + "\"" ); 
		if ( value )
			writer.write( " checked " ); 
		writer.write( " >" ); 
	}
	/**
	 * Handle Exception
	 * 
	 * @param e