diff --git a/web/app/sketcher.js b/web/app/sketcher.js
index b45713a0..bcac7977 100644
--- a/web/app/sketcher.js
+++ b/web/app/sketcher.js
@@ -84,19 +84,7 @@ function initializeSketcherApplication() {
     },
 
     click : function(item) {
-      var c = item.constr;
-      if (c.SettableFields === undefined) return;
-      for (var f in c.SettableFields) {
-        var value = c[f];
-        var intro = c.SettableFields[f];
-
-
-        value = askNumber(intro, typeof(value) == "number" ? value.toFixed(4) : value, prompt, pm.constantResolver);
-        if (value != null) {
-          c[f] = value;
-        }
-      }
-      app.viewer.parametricManager.refresh();
+      pm.updateConstraintConstants(item.constr);
     }
   });
   var constraintsView = app.dock.views['Constraints'];
diff --git a/web/app/sketcher/components/ConstraintExplorer.jsx b/web/app/sketcher/components/ConstraintExplorer.jsx
index 2afaca23..2e270790 100644
--- a/web/app/sketcher/components/ConstraintExplorer.jsx
+++ b/web/app/sketcher/components/ConstraintExplorer.jsx
@@ -23,7 +23,8 @@ import Fa from 'ui/components/Fa';
     viewer.deselectAll();
     viewer.refresh();
   },
-  constraints: ctx.services.sketcher.inPlaceEditor.viewer.parametricManager.system.constraints
+  constraints: ctx.services.sketcher.inPlaceEditor.viewer.parametricManager.system.constraints,
+  updateConstraintConstants: c => ctx.services.sketcher.inPlaceEditor.viewer.parametricManager.updateConstraintConstants(c)
 }))
 export class ConstraintExplorer extends React.Component {
 
@@ -33,6 +34,7 @@ export class ConstraintExplorer extends React.Component {
       <div className={ls.titleBar}>Constraints</div>
       <div className={ls.scrollableArea}>
         {constraints.map((c, i) => <div key={c.id} className={ls.objectItem} 
+                                        onClick={() => this.props.updateConstraintConstants(c)}
                                         onMouseEnter={() => this.props.highlight(c)}
                                         onMouseLeave={() => this.props.withdraw(c)}>
           <span className={ls.objectIcon}><img width="15px" src='img/vec/pointOnArc.svg'/></span>
diff --git a/web/app/sketcher/parametric.js b/web/app/sketcher/parametric.js
index 1f36251e..494cdaea 100644
--- a/web/app/sketcher/parametric.js
+++ b/web/app/sketcher/parametric.js
@@ -872,5 +872,20 @@ ParametricManager.prototype.prepareForSubSystem = function(locked, subSystemCons
   return solver; 
 };
 
+ParametricManager.prototype.updateConstraintConstants = function(constr) {
+  let c = constr;
+  if (c.SettableFields === undefined) return;
+  for (let f in c.SettableFields) {
+    let value = c[f];
+    let intro = c.SettableFields[f];
+    value = askNumber(intro, typeof(value) === "number" ? value.toFixed(4) : value, prompt, this.constantResolver);
+    if (value != null) {
+      c[f] = value;
+    }
+  }
+  this.viewer.parametricManager.refresh();
+};
+
 import {Constraints} from './constraints';
+import {askNumber} from '../utils/utils';
 export {Constraints, ParametricManager}
\ No newline at end of file