Fix: added default attribute values for _scaleStart, _scaleEnd an…

…d `_scaleStep`. Changed `_scaleEnd` schema default from 1 to 10. (fixes #204).

README.md

@@ -64,11 +64,11 @@ guide the learner’s interaction with the component.
 
 **labelEnd** (string): Text/characters that appear at the end of the slider scale.
 
-**\_scaleStart** (number): This value is the numeric start of the scale. It is used to calculate the slider's position on the scale.
+**\_scaleStart** (number): This value is the numeric start of the scale. It is used to calculate the slider's position on the scale. The default is `1`.
 
-**\_scaleEnd** (number): This value is the numeric end of the scale. It is used to calculate the slider's position on the scale.
+**\_scaleEnd** (number): This value is the numeric end of the scale. It is used to calculate the slider's position on the scale. The default is `10`.
 
-**\_scaleStep** (number): Defines the amount the scale should be incremented by.
+**\_scaleStep** (number): Defines the amount the scale should be incremented by. The default is `1`.
 
 **scaleStepPrefix** (string): Prefix to add to each slider step. For example, a "$" can be used as a prefix to indicate currency in dollars (ex. $100).
 

js/SliderModel.js

@@ -5,6 +5,9 @@ export default class SliderModel extends QuestionModel {
 
   defaults() {
     return QuestionModel.resultExtend('defaults', {
+      _scaleStart: 1,
+      _scaleEnd: 10,
+      _scaleStep: 1,
       _showScale: true,
       _showScaleNumbers: true,
       _showScaleIndicator: true,

properties.schema

@@ -187,7 +187,7 @@
     "_scaleEnd": {
       "type": "number",
       "required": true,
-      "default": 1,
+      "default": 10,
       "title": "Scale End",
       "inputType": "Number",
       "validators": ["required", "number"],

schema/component.schema.json

@@ -116,7 +116,7 @@
         "_scaleEnd": {
           "type": "number",
           "title": "Scale end number",
-          "default": 1
+          "default": 10
         },
         "_scaleStep": {
           "type": "number",