CODEWITHSUNDEEP
javascriptfunction
tkrishnan
tkrishnan

Reputation: 327

Calling a function that's defined inside a function

*Is there a way to call a function defined inside another function in javaSCRIPT? For example:

window.onload() = function() {
    function my_function(){
        print("Blah");
    };
};

function function_two(){
    my_function();
};

Is there a way to do something like the above (calling my_function in function_two even though it's defined inside the window.onload() function)? In my actual code, which also uses the raphael.js library, I'm trying to write a button in HTML, which using the onClick function, calls a function(like function_two) that runs the function defined in window.onload() (like my_function). However the console says that the my_function is undefined.

Upvotes: 10

Views: 20986

Answers (3)

uadnal
uadnal

Reputation: 11445

window.onload = function() {
    my_function()
};

function my_function(){
    alert("Blah");
};

function function_two(){
    my_function();
};

Upvotes: 3

Ben Hull
Ben Hull

Reputation: 7673

The scope of the function is the core issue here, as Zeychin and Trevor have said. I thought I'd offer another way of handling it. Basically, you can set your function to a variable that's in a higher scope (that is, accessible to both the onload and function_two functions), while defining it inside the onload function as you originally have:

var myFunction; //This is the placeholder which sets the scope

window.onload() = function() {
   myFunction = function() { //Assign the function to the myFunction variable
      print('blah');
   }
}

function function_two() {
   myFunction();
}

This might be handy if you only know the information you need for myFunction once you're in the onload event.

Upvotes: 12

Zéychin
Zéychin

Reputation: 4205

You can not do what you are asking to do. The function my_function()'s scope is only within the anonymous function, function(). It falls out of scope when the method is not executing, so this is not possible. Trevor's answer is the way to do this.

Upvotes: 3

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