Element is null javascript error

As expected, this throws a Null or Undefined Has No Properties error at us although, as is commonly the case, Chrome reports the error slightly differently :. This particular error 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.

As we saw above, null is considered an object type, which can inherently have properties, so why is it that null has no properties? The reason is because, unlike all other objects, null represents nothing — a nonexistent entity. Unlike every other object which might be defined, the JavaScript engine sees a null value and immediately treats it as a pointer to nothing.

Since null references nothing, it therefore cannot have any properties of its own. To dive even deeper into understanding how your applications deal with JavaScript Errors, check out the revolutionary Airbrake JavaScript error tracking tool for real-time alerts and instantaneous insight into what went wrong with your JavaScript code.

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Linked 0. Related C ASP. Skill Tests ASP. Example: null. Example: null in conditional expression. Example: undefined. Example: undefined in Conditional Expression. Points to Remember :. A null value means absence. An undefined value means lack of value.

A null or undefined value evalutes to false in conditional expression. Want to check how much you know JavaScript?