validate string null or empty javascript code example
Example 1: javascript is not null
if(data !== null && data !== '') {
// do something
}
Example 2: empty string in javascript
var s; // undefined
var s = ""; // ""
s.length // 0
if(data !== null && data !== '') {
// do something
}
var s; // undefined
var s = ""; // ""
s.length // 0