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 indexof
• Cannot read property quesryselectorall
• Cannot read property keycode
• Cannot read property concat
• Cannot read property constructor
• Cannot read property call
• Cannot read property setattribute
• Cannot read property findindex
• Cannot read property xrm
• Cannot read property websiteid
• Cannot read property addeventlistener
• Cannot read property classlist
• Cannot read property form
• Cannot read property words
• Cannot read property y
• Cannot read property getelementsbyclassname
• Cannot read property type
• Cannot read property view
• Cannot read property install
• Cannot read property async
• Cannot read property display
• Cannot read property adatasort
• Cannot read property replace
• Cannot read property hasownproperty
• Cannot read property zindex
• Cannot read property queuedepthsort
• Cannot read property ext
• Cannot read property getelementsbytagname
• Cannot read property query
• Cannot read property history
• Cannot read property scrolltop
• Cannot read property appendchild
• Cannot read property id
• Cannot read property left
• Cannot read property queryselector
• Cannot read property which
• Cannot read property bind
• Cannot read property jspdf
• Cannot read property header
• Cannot read property each
• Cannot read property includes
• Cannot read property toggle
• Cannot read property top
• Cannot read property render
• Cannot read property have
• Cannot read property locals
• Cannot read property click
• Cannot read property setstate
• Cannot read property key
• Cannot read property style
• Cannot read property msie
• Cannot read property element
• Cannot read property foreach
• Cannot read property join
• Cannot read property nodetype
• Cannot read property submit
• Cannot read property pending

Uncaught TypeError: Cannot read property '' of null