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 trim
• Cannot read property textcontent
• Cannot read property rows
• Cannot read property click
• Cannot read property defaultview
• Cannot read property innerhtml
• Cannot read property locals
• Cannot read property reload
• Cannot read property history
• Cannot read property find
• Cannot read property ngmodule
• Cannot read property top
• Cannot read property tostring
• Cannot read property adatasort
• Cannot read property height
• Cannot read property tolowercase
• Cannot read property option
• Cannot read property getitem
• Cannot read property 1
• Cannot read property get
• Cannot read property toggle
• Cannot read property bind
• Cannot read property validate
• Cannot read property keyup
• Cannot read property zone
• Cannot read property bridge
• Cannot read property formatdate
• Cannot read property style
• Cannot read property x
• Cannot read property version
• Cannot read property msie
• Cannot read property contains
• Cannot read property jquery
• Cannot read property firstchild
• Cannot read property prototype
• Cannot read property setattribute
• Cannot read property removechild
• Cannot read property quesryselectorall
• Cannot read property map
• Cannot read property browser
• Cannot read property match
• Cannot read property datatable
• Cannot read property display
• Cannot read property each
• Cannot read property left
• Cannot read property header
• Cannot read property target
• Cannot read property visible
• Cannot read property split
• Cannot read property then
• Cannot read property value
• Cannot read property state
• Cannot read property json
• Cannot read property hasownproperty
• Cannot read property dataset
• Cannot read property webkit
• Cannot read property destroy

Uncaught TypeError: Cannot read property '' of null