Getting results from a function

gns100 · Mar 18, 2004

Simple question. I'm trying to return the result for calculation of "xout" from the function test() below. Instead of the result "xo = 4), I get xo is "undefined", I'm missing something basic here. Eventually, I want to return the results of many calculations from the function test().

Any help would be appreciated. Thanks.

Code:

<html>
<head>
<title>Test Function</title>
</head>
<body>
<SCRIPT LANGUAGE="JavaScript">

function test(xin, xout){
	alert("xin = " + xin);
	xout=xin*2;
}

var x=2;
var xo;

javascript:test(x, xo);

alert("x = " + x);
alert("xo = " + xo);
</SCRIPT>
</body>
</html>

adam0101 · Mar 18, 2004

It should be more like this:

Code:

<html>
<head>
<title>Test Function</title>
</head>
<body>
<SCRIPT LANGUAGE="JavaScript">

function test(xin){
    var xout;
    alert("xin = " + xin);
    xout=xin*2;
    return xout;
}

var x=2;
var xo;

xo=test(x);

alert("x = " + x);
alert("xo = " + xo);
</SCRIPT>
</body>
</html>

Adam
while(ignorance){perpetuate(violence,fear,hatred);life=life-1};

gns100 · Mar 18, 2004

Thanks Adam for the suggestion - I got it working. However, as I mentioned I want to transfer more than one variable. I have modified the example below to illustrate. I need both xo and yo.

Code:

<html>
<head>
<title>Test Function</title>
</head>
<body>
<SCRIPT LANGUAGE="JavaScript">

function test(xin, yin){
	var xout;
	var yout;
	alert("xin = " + xin);
	alert("yin = " + yin);
	xout=xin*2;
	yout=yin*4;
	return xout;
}

var x=2;
var y=3;
var xo;
var yo;

xo = test(x, y);

alert("x = " + x);
alert("y = " + y);
alert("xo = " + xo);
alert("yo = " + yo);
</SCRIPT>
</body>
</html>

adam0101 · Mar 18, 2004

Ok, I missed that part. "return" only returns one object so if you wanted to return more than one thing, you could return an array of objects, but since xo and yo are declared outside of a function, they're global. That means you can change them whenever you want. You don't need to return anything.

Code:

<html>
<head>
<title>Test Function</title>
</head>
<body>
<SCRIPT LANGUAGE="JavaScript">

function test(xin, yin){
    alert("xin = " + xin);
    alert("yin = " + yin);
    [b]xo[/b]=xin*2;
    [b]yo[/b]=yin*4;
}

var x=2;
var y=3;
var xo;
var yo;

test(x, y);

alert("x = " + x);
alert("y = " + y);
alert("xo = " + xo);
alert("yo = " + yo);
</SCRIPT>
</body>
</html>

Adam
while(ignorance){perpetuate(violence,fear,hatred);life=life-1};

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Getting results from a function

gns100

Programmer

adam0101

Programmer

gns100

Programmer

adam0101

Programmer

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