diff --git a/src/main/java/com/metaweb/gridworks/browsing/facets/RangeFacet.java b/src/main/java/com/metaweb/gridworks/browsing/facets/RangeFacet.java
index 5d36cd941..eb4071170 100644
--- a/src/main/java/com/metaweb/gridworks/browsing/facets/RangeFacet.java
+++ b/src/main/java/com/metaweb/gridworks/browsing/facets/RangeFacet.java
@@ -29,6 +29,7 @@ public class RangeFacet implements Facet {
 	
 	protected double	_from;
 	protected double	_to;
+	protected boolean	_selected;
 	
 	public RangeFacet() {
 	}
@@ -79,36 +80,49 @@ public class RangeFacet implements Facet {
 		
 		_mode = o.getString("mode");
 		if ("min".equals(_mode)) {
-			_from = o.getDouble("from");
+			if (o.has("from")) {
+				_from = o.getDouble("from");
+				_selected = true;
+			}
 		} else if ("max".equals(_mode)) {
-			_to = o.getDouble("to");
+			if (o.has("to")) {
+				_to = o.getDouble("to");
+				_selected = true;
+			}
 		} else {
-			_from = o.getDouble("from");
-			_to = o.getDouble("to");
+			if (o.has("from") && o.has("to")) {
+				_from = o.getDouble("from");
+				_to = o.getDouble("to");
+				_selected = true;
+			}
 		}
 	}
 
 	@Override
 	public RowFilter getRowFilter() {
-		if ("min".equals(_mode)) {
-			return new ExpressionNumberComparisonRowFilter(_eval, _cellIndex) {
-				protected boolean checkValue(double d) {
-					return d >= _from;
+		if (_selected) {
+			if ("min".equals(_mode)) {
+				return new ExpressionNumberComparisonRowFilter(_eval, _cellIndex) {
+					protected boolean checkValue(double d) {
+						return d >= _from;
+					};
 				};
-			};
-		} else if ("max".equals(_mode)) {
-			return new ExpressionNumberComparisonRowFilter(_eval, _cellIndex) {
-				protected boolean checkValue(double d) {
-					return d <= _to;
+			} else if ("max".equals(_mode)) {
+				return new ExpressionNumberComparisonRowFilter(_eval, _cellIndex) {
+					protected boolean checkValue(double d) {
+						return d <= _to;
+					};
 				};
-			};
+			} else {
+				return new ExpressionNumberComparisonRowFilter(_eval, _cellIndex) {
+					protected boolean checkValue(double d) {
+						return d >= _from && d <= _to;
+					};
+				};
+			}		
 		} else {
-			return new ExpressionNumberComparisonRowFilter(_eval, _cellIndex) {
-				protected boolean checkValue(double d) {
-					return d >= _from && d <= _to;
-				};
-			};
-		}		
+			return null;
+		}
 	}
 
 	@Override
@@ -127,6 +141,14 @@ public class RangeFacet implements Facet {
 		_step = index.getStep();
 		_baseBins = index.getBins();
 		
+		if (_selected) {
+			_from = Math.max(_from, _min);
+			_to = Math.min(_to, _max);
+		} else {
+			_from = _min;
+			_to = _max;
+		}
+		
 		ExpressionNumericRowBinner binner = 
 			new ExpressionNumericRowBinner(_eval, _cellIndex, index);
 		
diff --git a/src/main/java/com/metaweb/gridworks/expr/Parser.java b/src/main/java/com/metaweb/gridworks/expr/Parser.java
index 25a41b7c6..2ffc7edb1 100644
--- a/src/main/java/com/metaweb/gridworks/expr/Parser.java
+++ b/src/main/java/com/metaweb/gridworks/expr/Parser.java
@@ -17,6 +17,7 @@ import com.metaweb.gridworks.expr.functions.IsBlank;
 import com.metaweb.gridworks.expr.functions.IsNotBlank;
 import com.metaweb.gridworks.expr.functions.IsNotNull;
 import com.metaweb.gridworks.expr.functions.IsNull;
+import com.metaweb.gridworks.expr.functions.Length;
 import com.metaweb.gridworks.expr.functions.Not;
 import com.metaweb.gridworks.expr.functions.Or;
 import com.metaweb.gridworks.expr.functions.Replace;
@@ -44,6 +45,7 @@ public class Parser {
 		functionTable.put("substring", new Slice());
 		functionTable.put("replace", new Replace());
 		functionTable.put("split", new Split());
+		functionTable.put("length", new Length());
 		
 		functionTable.put("and", new And());
 		functionTable.put("or", new Or());
diff --git a/src/main/java/com/metaweb/gridworks/expr/functions/Length.java b/src/main/java/com/metaweb/gridworks/expr/functions/Length.java
new file mode 100644
index 000000000..c5b1d60d0
--- /dev/null
+++ b/src/main/java/com/metaweb/gridworks/expr/functions/Length.java
@@ -0,0 +1,27 @@
+package com.metaweb.gridworks.expr.functions;
+
+import java.util.Properties;
+
+import com.metaweb.gridworks.expr.Function;
+
+public class Length implements Function {
+
+	@Override
+	public Object call(Properties bindings, Object[] args) {
+		if (args.length == 1) {
+			Object v = args[0];
+			
+			if (v != null) {
+				if (v.getClass().isArray()) {
+					Object[] a = (Object[]) v;
+					return a.length;
+				} else {
+					String s = (v instanceof String ? (String) v : v.toString());
+					return s.length();
+				}
+			}
+		}
+		return null;
+	}
+
+}
diff --git a/src/main/webapp/scripts/project/data-table-view.js b/src/main/webapp/scripts/project/data-table-view.js
index 39b491cff..8c4372943 100644
--- a/src/main/webapp/scripts/project/data-table-view.js
+++ b/src/main/webapp/scripts/project/data-table-view.js
@@ -370,7 +370,11 @@ DataTableView.prototype._createMenuForColumnHeader = function(column, index, elm
                 },
                 {
                     label: "Custom Text Facet ...",
-                    click: function() { self._doFilterByExpressionPrompt(column); }
+                    click: function() { self._doFilterByExpressionPrompt(column, "value", "list"); }
+                },
+                {
+                    label: "Custom Numeric Facet ...",
+                    click: function() { self._doFilterByExpressionPrompt(column, "value", "range"); }
                 },
                 {},
                 {
@@ -637,21 +641,23 @@ DataTableView.prototype._createMenuForColumnHeader = function(column, index, elm
     ], elmt, { width: "120px", horizontal: false });
 };
 
-DataTableView.prototype._doFilterByExpressionPrompt = function(column, expression) {
+DataTableView.prototype._doFilterByExpressionPrompt = function(column, expression, type) {
     var self = this;
     DataTableView.promptExpressionOnVisibleRows(
         column,
         "Custom Filter on " + column.headerLabel, 
-        "value",
+        expression,
         function(expression) {
-            ui.browsingEngine.addFacet(
-                "list", 
-                {
-                    "name" : column.headerLabel + ": " + expression,
-                    "cellIndex" : column.cellIndex, 
-                    "expression" : expression
-                }
-            );
+            var config = {
+                "name" : column.headerLabel + ": " + expression,
+                "cellIndex" : column.cellIndex, 
+                "expression" : expression
+            };
+            if (type == "range") {
+                config.mode = "range";
+            }
+
+            ui.browsingEngine.addFacet(type, config);
         }
     );
 };