Categories: DevelopmentJavascript

Scope & global variables using the window object

There are many instances were you might like to define global variables, that can be used anywhere.

This does not work:

    

  1. 
var my_variable = 1

    2. 

  2.  
    3. 

  3. $.getScript( "my_script.js", function() {

    4. 

  4.  alert(my_variable);

    5. 

  5. 
});

    6.

This works:

    

  1. window.my_variable = 1

    2. 

  2.  
    3. 

  3. $.getScript( "my_script.js", function() {

    4. 

  4.  alert(window.my_variable);

    5. 

  5. 
});

    6.

In case of the first $.geScript function(){…} the my_variable is only availble within the scope of the function. In the second the variable is assigned to the window object and can be used within.

Alex

I am a full-stack developer. I love programming,  design and know my way around server architecture as well.  I would never feel complete, with one of these missing. I have a broad range of interests, that’s why I constantly dive into new technologies and expand my knowledge where ever required. Technologies are evolving fast and I enjoy using the latest. Apart from that, I am a peace loving guy who tries to have people around him that think the same.  I truly believe in the principle: “If you help someone, someone will help you, when you need it."

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Alex
10 years ago

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