Settings, "Show cards count" keyboard input possible

client/components/users/userHeader.jade

@@ -143,7 +143,7 @@ template(name="changeSettingsPopup")
         label.bold.clear
           i.fa.fa-sort-numeric-asc
           | {{_ 'show-cards-minimum-count'}}
-        input#show-cards-count-at.inline-input.left(type="number" value="#{showCardsCountAt}" min="0" max="99" onkeydown="return false")
+        input#show-cards-count-at.inline-input.left(type="number" value="#{showCardsCountAt}" min="0" max="99")
         label.bold.clear
           i.fa.fa-calendar
           | {{_ 'start-day-of-week'}}

client/components/users/userHeader.js

@@ -271,6 +271,13 @@ Template.changeSettingsPopup.helpers({
 });
 
 Template.changeSettingsPopup.events({
+  'keypress/paste #show-cards-count-at'() {
+    let keyCode = event.keyCode;
+    let charCode = String.fromCharCode(keyCode);
+    let regex = new RegExp("[0-9]");
+    let ret = regex.test(charCode);
+    return ret;
+  },
   'click .js-toggle-desktop-drag-handles'() {
     currentUser = Meteor.user();
     if (currentUser) {
@@ -293,7 +300,7 @@ Template.changeSettingsPopup.events({
   },
   'click .js-apply-user-settings'(event, templateInstance) {
     event.preventDefault();
-    const minLimit = parseInt(
+    let minLimit = parseInt(
       templateInstance.$('#show-cards-count-at').val(),
       10,
     );
@@ -302,6 +309,9 @@ Template.changeSettingsPopup.events({
       10,
     );
     const currentUser = Meteor.user();
+    if (isNaN(minLimit)) {
+      minLimit = 0;
+    }
     if (!isNaN(minLimit)) {
       if (currentUser) {
         Meteor.call('changeLimitToShowCardsCount', minLimit);