javascript - can someone explain to me why i get an Uncaught TypeError: cannot set property of null - Stack Overflow

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(function() {
        var myFunc = {
             init : function() {
                alert("I need");
                document.getElementById("myDiv").innerHTML = "help";
            }
        };
window.myFunc = myFunc;
})();
myFunc.init();

The alert() message works but the Uncaught TypeError is thrown when it reaches the next line. Can anyone explain to me why and how to fix it? I assume it is something to do with the scoping of the function as it will work if nested within the myDiv rather than the linked .js file.

Thanks

(function() {
        var myFunc = {
             init : function() {
                alert("I need");
                document.getElementById("myDiv").innerHTML = "help";
            }
        };
window.myFunc = myFunc;
})();
myFunc.init();

The alert() message works but the Uncaught TypeError is thrown when it reaches the next line. Can anyone explain to me why and how to fix it? I assume it is something to do with the scoping of the function as it will work if nested within the myDiv rather than the linked .js file.

Thanks

• javascript

Share Improve this question Follow asked Nov 16, 2010 at 16:35 neiler45neiler45 311 silver badge22 bronze badges 2

• Nothing looks wrong with your code. Which browser is it failing in? I tried it in FF4, IE8, and Chrome9. They all worked. jsfiddle/PffYx – James Kovacs Commented Nov 16, 2010 at 16:40
• its in chrome. the alert works fine which is why i cant understand why it gets that far but wont set the innerHTML – neiler45 Commented Nov 16, 2010 at 16:51

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2 Answers 2

Sorted by: Reset to default 5

Your script is executing before the document is parsed.

You should move the <script> tag to the bottom of the document, or call init in the onload event.

is document.getElementById("myDiv") returning null?

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