if null javascript code example

Example 1: javascript is not null

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

Example 2: javascript check if not null

//Even if the value is 0, this will execute. 

if (myVar !== null) {...}

//If you don't want it to execute when it's 0, then set it as

if (myVar) {...}

//This will return false if var value is 0.

Example 3: check if variable is undefined or null jquery

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

Example 4: 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 5: js check null

if (Var === null) { 
//code goes here
}

Example 6: javascript check for null variables

var myVar=null;

if(myVar === null){
    //I am null;
}

if (typeof myVar === 'undefined'){
    //myVar is undefined
}