Placing If Statement inside another IF Statement is called JavaScript Nested If. The JavaScript Else Statement allows us to print different statements depending upon the expression result (TRUE, FALSE). Sometimes we have to check even further, when the condition is TRUE. In these situation, we can use Nested IF statements but be careful while using it.
For example, every person is eligible to work if he is 18 years old or above else he is not eligible but companies will not give job to every person. So, we use another If Statement (Also called as Nested If Statement) to check his education qualifications or any specific company requirements.
JavaScript Nested If Syntax
The Nested If in JavaScript programming language Syntax is as follows:
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if ( test condition 1) { //If the test condition 1 is TRUE then these it will check for test condition 2 if ( test condition 2) { //If the test condition 2 is TRUE then these statements will be executed Test condition 2 True statements; } else { //If the c test condition 2 is FALSE then these statements will be executed Test condition 2 False statements; } else { //If the test condition 1 is FALSE then these statements will be executed Test condition 1 False statements; } |
Flow Chart for JavaScript Nested If
Let us see the flow chart for better understanding.
If the Test Condition1 is FALSE then STATEMENT3 will be executed. If Test Condition1 is TRUE then it will check for the Test Condition2, if it is TRUE then STATEMENT1 will be executed or else STATEMENT2.
JavaScript Nested If Example
In this program, We will declare variable age and store default value. If the age is less than 18 we are going to print 2 statements. If the condition fails we will check one more condition (Nested) and if it succeed we print something. If the nested condition fails we print some other thing.
JAVASCRIPT CODE
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<!DOCTYPE html> <html> <head> <title> JavaScript Else Statement </title> </head> <h1> JavaScript Else Statement </h1> <body> <script> var age = 15; if( age < 18 ) { document.write("<b> You are Minor. </b>"); document.write("<br\> Not Eligible to Work " ); } else { if (age >= 18 && age <= 60 ) { document.write("<b> You are Eligible to Work. </b>"); document.write("<br\> Please fill in your details and apply " ); } else { document.write("<b> You are too old to work as per the Government rules </b>"); document.write("<br\> Please Collect your pension!" ); } } </script> </body> </html> |
ANALYSIS
If the person age is less than 18 then he is not eligible to work. If the person age is greater than or equal to 18 then first condition fails, it will check the else statement. Within the Else statement there is another if condition (this is called as Nested If).
- Nested IF Statement will check whether the person age is greater than or equal to 18 and less than or equal to 60. If the condition is TRUE then he can apply for the job.
- If the condition is FALSE then he is too old to work as per the government.
OUTPUT 1: Here the age is 15. First If condition is TRUE that’s why, statements inside the If Statement is displayed as Browser output
OUTPUT 2: Here we changed the age to 25. First If condition is FALSE. Nested IF condition is TRUE that’s why, statements inside the Nested If Statement is displayed as Browser output
OUTPUT 3: Here we changed the age to 61. Both If condition and also Nested IF condition failed here. So, statements inside the Nested Else Statement is displayed as Browser output
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