What is if...else if... statement in JavaScript?

JavascriptWeb DevelopmentFront End Technology

The if...else if... statement is an advanced form of if…else that allows JavaScript to make a correct decision out of several conditions.

Syntax

The syntax of an if-else-if statement is as follows −

if (expression 1){
   Statement(s) to be executed if expression 1 is true
}
else if (expression2){
   Statement(s) to be executed if expression 2 is true
}
else if (expression3){
   Statement(s) to be executed if expression 3 is true
}
else{
   Statement(s) to be executed if no expression is true
}

Example

You can try to run the following to learn how to work with if…else if statement in JavaScript −

Live Demo

<html>
   <body>
      <script>
         var book= "maths";
         if( book== "history" ){
            document.write("<b>History Book</b>");
         }
         else if(book == "maths" ){
            document.write("<b>Maths Book</b>");
         }
         else if(book == "economics" ){
            document.write("<b>EconomicsBook</b>");
         }
         else{
            document.write("<b>Unknown Book</b>");
         }
      </script>
   </body>
<html>
raja
Published on 19-Jan-2018 10:44:09
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