Hello All,
I have a simple question
How do i get a variable from one function into another function. I am new to javascript.
Here is my code
function timestart(that)
{
var x = new Date();
that.value = x;
}
function timeend(that)
{
var y = new Date()
that.value = y;
}
function duration()
{
var z = x - y;
alert("duration=" + z)
}Any insight is greatly appreciated. Thanks
Hello jaycastr,
A variable declared inside a JavaScript function will only be local if you write it like this:
function func(){
var x = 5;
}However, if you don't use the var keyword, it will be added onto the window element, and thus global:
function func(){
x = 5;
}Note: if a variable is referenced in JavaScript which isn't defined, it will do that for you, which is why this work.
Edit: I thought I might as well edit your example, to prevent confusion:
function timestart(that)
{
x = new Date();
that.value = x;
}
function timeend(that)
{
y = new Date()
that.value = y;
}
function duration()
{
var z = x - y;
alert("duration=" + z)
}And, to clarify, what is really happening now is that the last function calls window.x and window.y!
<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<script language="javaScript">
function Do_This() {
alert(7);
And_This(10);
}
function And_This(num) {
alert(num);
}
</script>
</head>
<body onLoad="Do_This();">
</body>
</html>Instead of 10 you can pass the variable.
One of the things I haven't seen yet is that you can send a variable from a function you call back to function that you called from.
function func1 (){
var msg = "Here I am";
var newMsg = func2(msg);
alert(newMsg); /* will print out "Here I am And Now Where are You?" in an alert box */
}
function func2(msg){
return msg + " And Now Where are You?";
}Thanks Guys very appreciative of ur help.
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