Thursday, May 9, 2019

html - Javascript - getElementById() returns null even though the element exists




I'm trying to get the element with getElementById(), but it returns null.



This is the error I get on mozilla firefox debugger




"TypeError: document.getElementById(...) is null".




What is wrong in the code?







  
    Stack
    

  
  
    
Frame One

    
Frame Three

    
Frame Two





Answer



top appears to be a reserved variable -- it resolves to window.top in your function. Try naming top something else like _top and you shouldn't get any errors.


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