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JavaScript If...Else Statements |
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JavaScript If...Else Statements
Conditional statements in JavaScript are used to perform different actions based on different conditions.
Conditional Statements Very often when you write code, you want to perform different actions for different decisions. You can use conditional statements in your code to do this. In JavaScript we have the following conditional statements:
If Statement You should use the if statement if you want to execute some code only if a specified condition is true. Syntax if (condition) { code to be executed if condition is true } Note that if is written in lowercase letters. Using uppercase letters (IF) will generate a JavaScript error! Example Notice that there is no ..else.. in this syntax. You tell the browser to execute some code only if the specified condition is true. If...else Statement If you want to execute some code if a condition is true and another code if the condition is not true, use the if....else statement. Syntax if (condition) { code to be executed if condition is true } else { code to be executed if condition is not true } Example If...else if...else Statement You should use the if....else if...else statement if you want to select one of many sets of lines to execute. Syntax if (condition1) { code to be executed if condition1 is true } else if (condition2) { code to be executed if condition2 is true } else { code to be executed if condition1 and condition2 are not true } Example |
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