[OpenLayers-Users] Share created function about SLD Filters

[fsalas]

Hi , 
We have been at work with the filters of layers and we like tho share the created functions. We hoped that help to them.

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//Function for apply filters on WMS Layers using selecting value, the main objetive of this function is make one sld and then //apply to point layers, although with some simple modification is extensive to another layers Ej. Polygon.....    


//*****  Function for make one filter of point layer ***********//

function  Crear_PropertyIsEqualTo(pPropertyName,pLiteral)
{
 var PropertyIsEqualTo = '<PropertyIsEqualTo>';
     PropertyIsEqualTo += '<PropertyName>'+pPropertyName+'</PropertyName>';
     PropertyIsEqualTo += '<Literal>'+pLiteral+'</Literal>';
  PropertyIsEqualTo += '</PropertyIsEqualTo>';
  
  return PropertyIsEqualTo;
} 

// this function make one properties for filters 

function  Crear_PropertyIsLessThanOrEqualTo(pPropertyName,pLiteral)
{
 var PropertyIsLessThanOrEqualTo = '<PropertyIsLessThanOrEqualTo>';
     PropertyIsLessThanOrEqualTo += '<PropertyName>'+pPropertyName+'</PropertyName>';
     PropertyIsLessThanOrEqualTo += '<Literal>'+pLiteral+'</Literal>';
  PropertyIsLessThanOrEqualTo += '</PropertyIsLessThanOrEqualTo>';
  
  return PropertyIsLessThanOrEqualTo;
} 

function  Crear_PropertyIsGreaterThanOrEqualTo(pPropertyName,pLiteral)
{
 var PropertyIsGreaterThanOrEqualTo = '<PropertyIsGreaterThanOrEqualTo>';
     PropertyIsGreaterThanOrEqualTo += '<PropertyName>'+pPropertyName+'</PropertyName>';
     PropertyIsGreaterThanOrEqualTo += '<Literal>'+pLiteral+'</Literal>';
  PropertyIsGreaterThanOrEqualTo += '</PropertyIsGreaterThanOrEqualTo>';
  
  return PropertyIsGreaterThanOrEqualTo;
} 
 
// thsi function make one filters for inside SLD using the propperties list meke before 


function Crear_Filter(Lista_Propertys,Cantidad)
{
 var Filter = '<Filter xmlns:gml="http://www.opengis.net/gml">'; 
 
   if(Cantidad == 0)
 {
    Filter = '';
 } 
    else if(Cantidad == 1)
 {
     Filter += Lista_Propertys;  
  Filter += '</Filter>';
 }
 else 
 {
     Filter += '<And>';
     for( var i = 0;i < Cantidad ;i++)
  {
    Filter += Lista_Propertys[i]; 
  }
  Filter += '</And>';
  Filter += '</Filter>';
 }  
 
   return Filter;
}

// This function return the image name that wil be show in the SLD simbology 

function GetImagen()
{
  if(document.getElementById('tipo_anav').value != "-1")
  {
     if(document.getElementById('tipo_anav').value == "FV")
    return "FV.gif";
    
     if(document.getElementById('tipo_anav').value == "FA")
    return "FA.gif";
    
     if(document.getElementById('tipo_anav').value == "BY")
    return "BY.gif";
    
     if(document.getElementById('tipo_anav').value == "BZ")
    return "BZ.gif";   
     
     if(document.getElementById('tipo_anav').value == "ENF")
    return "ENF.gif";      
  }  
  else
    return "FV.gif"; 
}
 
// This function create the Rule contained into the SLD 


function Crear_Rule(pFilter)
{ 
 var Rule ='<Rule>';
  if(pFilter != '') 
   Rule += pFilter;
  Rule +='<PointSymbolizer><Graphic><ExternalGraphic><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="file:/D:/AppServ/www/SIGANAV/images/'+GetImagen()+'"/><Format>image/gif</Format></ExternalGraphic><Opacity><Literal>1.0</Literal></Opacity><Size><Literal>20.0</Literal></Size><Rotation><Literal>0.0</Literal></Rotation></Graphic></PointSymbolizer>'; 
  Rule +='</Rule>';    
 return Rule; 
}
 
// This function create the SLD using the rule 


function Crear_StyledLayerDescriptor(pRule)  
{
   var StyledLayerDescriptor;
  StyledLayerDescriptor ='<StyledLayerDescriptor version="1.0.0"><UserLayer><Name>topp:sennal</Name><UserStyle><Name>UserSelection</Name><FeatureTypeStyle>'+pRule+'</FeatureTypeStyle></UserStyle></UserLayer></StyledLayerDescriptor>';
 
  return StyledLayerDescriptor;
}
 
 
// This function is one example tha How filter the layer using the selecting elements 
 
function FiltrarCapa()
{
  var listaPropiedades = new Array();
  var Cant = 0;  
  
  if(document.getElementById('emp').value != "-1")
  {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('empresa',document.getElementById('emp').value );
  }
  if(document.getElementById('est').value != "-1")
  {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('estacion',document.getElementById('est').value );
  }
  if(document.getElementById('tipo_anav').value != "-1")
  {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('tipo_senal',document.getElementById('tipo_anav').value );
  }

  if(document.getElementById('categoria').value != "-1")
  {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('categoria',document.getElementById('categoria').value );
  }
    
  if(document.getElementById('ciega').checked == true)
  {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('ciega_luminica','C');
  }   
  if(document.getElementById('luminica').checked == true)
  {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('ciega_luminica','L');
  }    
  

 if(document.getElementById('sennal_fuera_serv').checked == true)
  {
    var valor = "true";
listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('fuera_servicio',valor);
 
       if(document.getElementById('fecha_ini').value != "")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsLessThanOrEqualTo('fecha_falla',document.getElementById('fecha_ini').value );
    } 

       if(document.getElementById('fecha_fin').value != "")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsGreaterThanOrEqualTo('fecha_falla',document.getElementById('fecha_fin').value );
    }

       if(document.getElementById('tipo_falla').value != "-1")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('tipo_falla',document.getElementById('tipo_falla').value );
    }  
   if(document.getElementById('origen_falla').value != "-1")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('origen_falla',document.getElementById('origen_falla').value );
    }  
  
  }
    
  if(document.getElementById('mant_plan').checked == true)
  {
       if(document.getElementById('fecha_ini').value != "-1")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsLessThanOrEqualTo('fecha_mant_planificado',document.getElementById('fecha_ini').value );
    } 

       if(document.getElementById('fecha_fin').value != "-1")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsGreaterThanOrEqualTo('fecha_mant_planificado',document.getElementById('fecha_fin').value );
    }

       if(document.getElementById('tipo_mant').value != "-1")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('tipo_mant_realizado',document.getElementById('tipo_mant').value );
    }      
  }
  if(document.getElementById('mant_ejec').checked == true)
  {
       if(document.getElementById('fecha_ini').value != "-1")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsLessThanOrEqualTo('fecha_mant_realizado',document.getElementById('fecha_ini').value );
    } 

       if(document.getElementById('fecha_fin').value != "-1")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsGreaterThanOrEqualTo('fecha_mant_realizado',document.getElementById('fecha_fin').value );
    }

       if(document.getElementById('tipo_mant').value != "-1")
    {
    listaPropiedades[Cant++] = Crear_PropertyIsEqualTo('tipo_mant_realizado',document.getElementById('tipo_mant').value );
    }       
  }
//********************** Example of Call this functions     ************************//

   var Filtro = Crear_Filter(listaPropiedades,Cant);
   var Regla  = Crear_Rule(Filtro);
   var StyledLayerDescriptor = Crear_StyledLayerDescriptor(Regla);    
   map.layers[2].mergeNewParams({SLD_BODY:StyledLayerDescriptor});   
} 

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Best Regards , Salas




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