Answers for "javascript detect undefined"

7

javascript if undefined

if(typeof comment === 'undefined') {

  alert('Variable "comment" is undefined.');

} else if(comment === null){

  alert('Variable "comment" is null.');

}
Posted by: Guest on March-25-2020
3

how to check if object is undefined in javascript

if (typeof something === "undefined") {
    alert("something is undefined");
}
Posted by: Guest on November-26-2019
-2

undefined javascript check

if(undefinedElement === null) {
	console.log("Element is undefined");
}
Posted by: Guest on March-30-2020

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