JavaScript If/Else Syntax:

Use if/else statements when you want to make different things happen depending on different circumstances. Below is the syntax for an if/else statement in javaScript: 



        
 if (document.formMyFirstForm.txtMyStuff.size = = 30)
   {
    document.formMyFirstForm.txtMyStuff.size = = 20;
    document.formMyFirstForm.btnMyOnlyButton.value = "My Button is Big";
    }
 else
    {
    document.formMyFirstForm.txtMyStuff.size = = 30;
    document.formMyFirstForm.btnMyOnlyButton.value = "My Button is Small";
     }

All lines of code are suppose to end with a semi-colon. It is just like a period at the end of a sentence.
This is done so that you can place multiple commands on a single line. Like this: 


        alert("hello world!");
        alert("good-bye world");
       


       function doSomething( )
   

 
        {alert("hello world!");}

Now anytime on the page that this function is called, the user will get an alert box with the message
"hello world!" on it (along with the OK button).


JavaScript

Examples