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

Undefined means that a variable has been declared, but the value of that variable has not yet been defined. In JavaScript, there are Undefined (type), undefined (value) and undefined (variable).
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). This error occurs when we want to access a property on a variable whose value is undefined or null.

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 concat
• Cannot read property each
• Cannot read property join
• Cannot read property setstate
• Cannot read property then
• Cannot read property websiteid
• Cannot read property adatasort
• Cannot read property findindex
• Cannot read property install
• Cannot read property split
• Cannot read property element
• Cannot read property hasattribute
• Cannot read property data
• Cannot read property history
• Cannot read property display
• Cannot read property zindex
• Cannot read property readtext
• Cannot read property get
• Cannot read property fn
• Cannot read property sort
• Cannot read property getitem
• Cannot read property xlsx
• Cannot read property addmethod
• Cannot read property add
• Cannot read property indexof
• Cannot read property use
• Cannot read property removechild
• Cannot read property query
• Cannot read property write
• Cannot read property header
• Cannot read property prototype
• Cannot read property addeventlistener
• Cannot read property top
• Cannot read property defaultview
• Cannot read property visible
• Cannot read property ext
• Cannot read property scrolltop
• Cannot read property left
• Cannot read property value
• Cannot read property 2
• Cannot read property emit
• Cannot read property getattribute
• Cannot read property name
• Cannot read property filter
• Cannot read property editor
• Cannot read property createdocumentfragment
• Cannot read property xe
• Cannot read property xhr
• Cannot read property error
• Cannot read property play
• Cannot read property find
• Cannot read property 10
• Cannot read property foreach
• Cannot read property toggle
• Cannot read property ngmodule
• Cannot read property bridge
• Cannot read property firstchild

Uncaught TypeError: Cannot read property '' of null