Switch (Bootstrap)

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This control was added in Bootstrap 4.


The Switch control is a slider that changes between Off and On.

To add a Switch to your app, choose the Switch icon in the Toolbar, then position it on the Design Screen. Use the Property Editor to set the properties you need, then add functions to your code to respond to the events that come from the Switch: usually, just onchange.

As of Bootstrap 4.2, there is no way to change the color and size easily. Here are workarounds:

To double the size of the Switch:, put this the control's Style property:

transform: scale(2); left:50%;

To change the checked color to red, put this in Project CSS:

.custom-control-input:checked~.custom-control-label::before {
   color: #fff;
   background-color: red;
   outline: 0;
   -webkit-box-shadow: none;
   box-shadow: none;


Standard properties are supported, plus these, which can be set at Design Time:

text The text of the control. Default is true. Design Time and Runtime.
textColor The color of the text. Uses Bootstrap standard colors.
value The value of the control. Default is true. Design Time and Runtime.


// JavaScript
Switch1.onchange = function() {
  NSB.MsgBox("New value is " + Switch1.value);

' Basic
Function Switch1_onchange()
  MsgBox "New value is " & Switch1.value
End Function