Prevent invalid numeric entries.

cms/static/client_templates/metadata_number_entry.html

 <div class="wrapper-comp-setting">
 	<label class="label setting-label" for="<%= uniqueId %>"><%= model.get('display_name') %></label>
-	<input class="input setting-input setting-input-number" type="number" id="<%= uniqueId %>" value='<%= model.get("value") %>' onkeyup="checkNumberValidity(this)"/>
+	<input class="input setting-input setting-input-number" type="number" id="<%= uniqueId %>" value='<%= model.get("value") %>'/>
 	<button class="action setting-clear inactive" type="button" name="setting-clear" value="Clear" data-tooltip="Clear">
 		<i class="ss-icon ss-symbolicons-block undo">&#x21A9;</i><span class="sr">Clear Value</span>
 	</button>

cms/static/js/base.js

@@ -897,9 +897,5 @@ function saveSetSectionScheduleDate(e) {
     });
 }
 
-function checkNumberValidity(e) {
-    //e.preventDefault;
-    //$(e).val($(e).val().match(/\d*\.?\d+/));
-}
 
 

cms/static/js/views/metadata_editor_view.js

@@ -150,7 +150,8 @@ CMS.Views.Metadata.Number = CMS.Views.Metadata.AbstractEditor.extend({
 
     events : {
         "change input" : "updateModel",
-        "keypress .setting-input" : "showClearButton"  ,
+        "keypress .setting-input" : "keyPressed",
+        "change .setting-input" : "changed",
         "click .setting-clear" : "clear"
     },
 
@@ -162,14 +163,17 @@ CMS.Views.Metadata.Number = CMS.Views.Metadata.AbstractEditor.extend({
             var step = "step";
             var options = this.model.getOptions();
             if (options.hasOwnProperty(min)) {
-                this.$el.find('input').attr(min, options[min].toString());
+                this.min = Number(options[min]);
+                this.$el.find('input').attr(min, this.min.toFixed(4));
             }
             if (options.hasOwnProperty(max)) {
-                this.$el.find('input').attr(max, options[max].toString());
+                this.max = Number(options[max]);
+                this.$el.find('input').attr(max, this.max.toFixed(4));
             }
             var stepValue = undefined;
             if (options.hasOwnProperty(step)) {
-                stepValue = options[step].toString();
+                // Parse step and convert to String. Polyfill doesn't like float values like ".1" (expects "0.1").
+                stepValue = Number(options[step]).toFixed(4);
             }
             else if (this.model.getType() === 'Integer') {
                 stepValue = "1";
@@ -195,7 +199,35 @@ CMS.Views.Metadata.Number = CMS.Views.Metadata.AbstractEditor.extend({
 
     setValueInEditor : function (value) {
         this.$el.find('input').val(value);
+    },
+
+    keyPressed: function (e) {
+        this.showClearButton();
+        // This first filtering if statement is take from polyfill to prevent
+        // non-numeric input (for browsers that don't use polyfill because they DO have a number input type).
+        var _ref, _ref1;
+        if (((_ref = e.keyCode) !== 8 && _ref !== 9 && _ref !== 35 && _ref !== 36 && _ref !== 37 && _ref !== 39) &&
+            ((_ref1 = e.which) !== 45 && _ref1 !== 46 && _ref1 !== 48 && _ref1 !== 49 && _ref1 !== 50 && _ref1 !== 51
+                && _ref1 !== 52 && _ref1 !== 53 && _ref1 !== 54 && _ref1 !== 55 && _ref1 !== 56 && _ref1 !== 57)) {
+            e.preventDefault();
+        }
+        // For integers, prevent decimal points.
+        if (this.model.getType() === 'Integer' && e.keyCode === 46) {
+            e.preventDefault();
+        }
+    },
+
+    changed: function () {
+        // Limit value to the range specified by min and max (necessary for browsers that aren't using polyfill).
+        var value = this.getValueFromEditor();
+        if ((this.max !== undefined) && value > this.max) {
+            value = this.max;
+        } else if ((this.min != undefined) && value < this.min) {
+            value = this.min;
+        }
+        this.setValueInEditor(value);
     }
+
 });
 
 

common/lib/xmodule/xmodule/capa_module.py

@@ -92,7 +92,7 @@ class CapaFields(object):
     seed = StringyInteger(help="Random seed for this student", scope=Scope.user_state)
     weight = StringyFloat(display_name="Problem Weight",
         help="Specifies the number of points the problem is worth. If unset, each response field in the problem is worth one point.",
-        values = {"min" : 0 , "step": ".1"},
+        values = {"min" : 0 , "step": .1},
         scope=Scope.settings)
     markdown = String(help="Markdown source of this module", scope=Scope.settings)
     source_code = String(help="Source code for LaTeX and Word problems. This feature is not well-supported.",