javascript - Placeholder text is returned when using value property of input text box in form -

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I am using webshim to provide html5 placeholder functionality in my text box in IE8.

This works fine when I submit the form - the field is empty, if the user has not entered anything.

But when I tried to make an aggressive request by requesting an AJAX request, the following line of code 

  document.getElementById ('idOfTextBox') value   
 How can I avoid this behavior?   
 
 
 You can set it as optional  
  if (Document.getElementById ('idOfTextBox') .value == 'Placeholder') {document.getElementById ('idOfTextBox'). Value = ''; }   
 Basically, if textbox value = placeholder, this value will be set to '' (empty string)

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