Check If Is Null Javascript Code Example

Example 1: javascript is not null

if(data !== null && data !== '') {    // do something }

Example 2: check if variable is undefined or null jquery

if (variable == null) {     // variable is either null or undefined }

Example 3: javascript check if null

if (variable === null) { //Executes only if variable is null but not undefined   //Code here }  if (variable == null) { //Executes if variable is null OR undefined   //Code here }

Example 4: javascript check for null variables

var myVar=null;  if(myVar === null){     //I am null; }  if (typeof myVar === 'undefined'){     //myVar is undefined }

Example 5: javascript check if undefined or null

// simple check do the job if (myVar) {  // comes here either myVar is not null,  // or myVar is not undefined,  // or myVar is not '' (empty string). }