setting load_position only if the offset is zero

src/js/control-view.js

@@ -165,6 +165,10 @@ module.exports = {
       // return this.is_idle || this.is_paused;
     },
 
+    can_load_origin: function (axis) {
+      return this.is_idle && this.state["offset_" + axis] == 0;
+    },
+
     message: function () {
       if (this.mach_state == "ESTOPPED") {
         return this.state.er;

src/pug/templates/control-view.pug

@@ -163,7 +163,7 @@ script#control-view-template(type="text/x-template")
                     title=`Home {{'${axis}' | upper}} axis.`, style="height:60px;width:60px")
                     .fa.fa-home
 
-                  button.pure-button(:disabled="!is_idle", @click=`load_position('${axis}')`,
+                  button.pure-button(:disabled="!can_load_origin", @click=`load_position('${axis}')`,
                     title=`Load {{'${axis}' | upper}} origin.`, style="height:60px;width:60px")
                     .fa.fa-map-pin