url = `${conn.get('spatialUsergeomUrl')}&LAYERS=` + username + '%3A' + datasetNme + '&SRS='+
       srs + '&BBOX=' + bbox + '&WIDTH=' + width + '&height=' + height + '&TRANSPARENT=' + 
       transparent + '&buffer=' + buffer

I am loading important components it returns a response. After that I want one postGis query to be merged in above url in a format so that I may get proper response in request. I am adding postgis query.

if (cql_filter !== null) {
  url = url + `&${geoDetails.get('GeometricFunctionBasedSingleWithQuery')}` +
  '&viewparams=comparisonValue%3A' + comparisonValue + 
  '%3BcomparisonOperator%3A' + comparisonOperator + '%3Bquery%3A' + cql_filter + 
  '%3BdatasetNme%3A' + datasetNme +'%3BcomparisonFunction%3A' + 
  comparisonFunction + '%3Busername%3A' + username
}

postgis query is

select distinct "%username%"."%datasetNme%".geom from "%username%"."%datasetNme%" where   ST_%comparisonFunction%("%username%"."%datasetNme%".geom) %comparisonOperator% %comparisonValue% and %query%