Check If Variable Is Empty Javascript Code Example

Example 1: is var is not blank then display value in javascript

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

Example 2: javascript check if object is null or empty

if (typeof value !== 'undefined' && value) {     //deal with value' };

Example 3: javascript check if undefined or null or empty string

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

Example 4: javascript check if variable is empty

if( value ) {   // }  /** * This will evaluate to true if value is not: * null * undefined * NaN * empty string ("") * 0 * false */