Possible Duplicate:
How do I make a default value for a parameter to a javascript function
in PHP:
function func($a = 10, $b = 20){
// if func() is called with no arguments $a will be 10 and $ b will be 20
}
How can you do this in JavaScript?
I get a error if I try to assign values in function arguments
missing ) after formal parameters
In javascript you can call a function (even if it has parameters) without parameters.
So you can add default values like this:
function func(a, b){
if (typeof(a)==='undefined') a = 10;
if (typeof(b)==='undefined') b = 20;
//your code
}
and then you can call it like func();
to use default parameters.
Here's a test:
function func(a, b){
if (typeof(a)==='undefined') a = 10;
if (typeof(b)==='undefined') b = 20;
alert("A: "+a+"\nB: "+b);
}
//testing
func();
func(80);
func(100,200);