JavaScript Error: Uncaught TypeError: Cannot read property '' of null

JavaScript TypeError is returned when an operand or argument passed to a function is incompatible with the type expected by that operator or function. This error occurs in the browser when you read a property or call a method on an undefined object.
There are a few variations of this error depending on the property you are trying to access. Sometimes instead of undefined it will output null: Uncaught TypeError: Cannot read property '' of null

Cannot read property '' of undefined

Cannot read property '' of null

Simply put, undefined means that a variable has been declared but has not yet been given a value. This particular error is probably the easiest to understand from an undefined point of view, because undefined is not considered an object type at all (but its own undefined type instead), and properties cannot belong to only to objects in JavaScript.
This error occurs when we want to access a property on a variable whose value is undefined or null. This error occurs when you try to call a method or try to access a property of a variable that does not exist (is not an object).

Null vs. Undefined in JavaScript The value "undefined" indicates that a variable has been declared, but no value has been assigned. On the other hand, "null" refers to a non-existent object, which basically means "empty" or "nothing". These are two values ​​generally used to indicate the absence of something. Also, undefined and null are two distinct types: undefined is a type itself (undefined) while null is an object.

Other Javascript errors :

• Cannot read property keyboard
• Cannot read property createdocumentfragment
• Cannot read property bind
• Cannot read property concat
• Cannot read property left
• Cannot read property createelement
• Cannot read property height
• Cannot read property zone
• Cannot read property props
• Cannot read property render
• Cannot read property play
• Cannot read property visible
• Cannot read property 2
• Cannot read property scrolltop
• Cannot read property helpers
• Cannot read property xrm
• Cannot read property foreach
• Cannot read property zindex
• Cannot read property rows
• Cannot read property webkit
• Cannot read property uid
• Cannot read property words
• Cannot read property get
• Cannot read property split
• Cannot read property 3
• Cannot read property form
• Cannot read property indexof
• Cannot read property query
• Cannot read property datatable
• Cannot read property formatdate
• Cannot read property async
• Cannot read property keycode
• Cannot read property location
• Cannot read property reset
• Cannot read property history
• Cannot read property push
• Cannot read property preventdefault
• Cannot read property hide
• Cannot read property innertext
• Cannot read property play
• Cannot read property removechild
• Cannot read property readtext
• Cannot read property use
• Cannot read property jsonmodel
• Cannot read property style
• Cannot read property register
• Cannot read property editor
• Cannot read property classlist
• Cannot read property quesryselectorall
• Cannot read property ngmodule
• Cannot read property error
• Cannot read property sort
• Cannot read property tostring
• Cannot read property have
• Cannot read property submit
• Cannot read property xhr
• Cannot read property browserwindow

Uncaught TypeError: Cannot read property '' of null