Uncaught Typeerror: Cannot Read Property 'html' of Undefined

Uncaught TypeError: Cannot read property of undefined

JavaScript TypeError is thrown when an operand or argument passed to a function is incompatible with the type expected past that operator or part. This error occurs in Chrome 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 lot are trying to access. Sometimes instead of undefined it will say cipher.

case

When y'all run this code, yous will get this message in browser:

In bones terms, undefined means that a variable has been declared but has not yet been assigned a value. This particular mistake is probably easiest to understand from the perspective of undefined, since undefined is not considered an object type at all (but its own undefined type instead), and properties can only belong to objects within JavaScript.

In the above lawmaking, when yous go undefined error , you need to make sure that whichever variables throws undefined error, is assigned a value to it.

example

In the to a higher place JacaScript you can the variable testVar is initialized the value of 99. So the script run successfully.

Handling undefined

Y'all can handle undefined by using if statement.

JavaScript undefined

Undefined means a variable has been declared, but the value of that variable has not yet been divers. In JavaScript there is Undefined ( blazon ), undefined ( value ) and undefined ( variable ).

output

Also, undefined is of the type undefined:

output

Moreover, declare a variable and then assign undefined to it:

output

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Source: http://net-informations.com/js/iq/unerror.htm

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