Updated docs

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docs/objects/Object/onChange.md

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+# onChange
+`onChange(self)`<br>
+This is a custom event which gets triggered as soon as the function :setValue() is called. This function is also called by basalt, for example if you change the input, textfield or checkbox (or all the different types of lists) objects.
+
+Here is a example on how to add a onChange event to your input, and also another example for your checkbox:
+
+```lua
+local basalt = require("basalt")
+
+local main = basalt.createFrame()
+local aInput = main:addInput():setPosition(3,3)
+local aCheckbox = main:addCheckbox():setPosition(3,5)
+
+local function checkInput(input)
+    if(string.lower(input:getValue())=="hello")then
+        basalt.debug("Hello back!")
+    end
+end
+
+local function checkCheckbox(checkbox)
+    if(checkbox:getValue()==true)then -- or if(checkbox:getValue())then
+        basalt.debug("Checkbox is active, let's do something!")
+    end
+end
+
+aInput:onChange(checkInput)
+aCheckbox:onChange(checkCheckbox)
+```