I have a JavaScript function to generate a variable. That function is activated by an onclick button event.
After that variable is generated, I need to use it as a global variable so that other JavaScript processes can use that variable.
How do I do it?
Normally, when you create a variable inside a function, that variable is local, and can only be used inside that function. To create a global variable inside a function, you can use the global keyword.
If you want to refer to a global variable in a function, you can use the global keyword to declare which variables are global.
A global object is an object that always exists in the global scope. In JavaScript, there's always a global object defined. In a web browser, when scripts create global variables defined with the var keyword, they're created as members of the global object.
You should be able to add the variable's value to a property of the global window
object:
window.yourVarName = yourVarName;
Then the other functions will be able to access yourVarName
simply by referencing yourVarname
directly. There will be no need to use window.yourVarName
.
However keep in mind that in general, global variables are evil.
Declare the variable outside the scope of the function:
var foo = null;
function myClickEvent() {
foo = someStuffThatGetsValue;
}
Better yet, use a single global variable as the namespace ("MyApp") for your application, and store the value inside that:
var MyApp = {
foo: null
};
function myClickEvent() {
MyApp.foo = someStuffThatGetsValue;
}
The function itself could even be included in there.
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