html - JavaScript: Get next element from Parent -

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I want to disable the next element of the parent of a tag:
html: 

  & lt; Period & gt; & Lt; Input type = "checkbox" onchange = "disableInput (this)" & gt; & Lt; / Span & gt; & Lt; Input type = "text" / & gt; & Lt ;! - When the checkbox is changed, disable the input field - & gt;

Javascript: 

  & lt; Script & gt; Function disable input (element) {element.parentNode.nextSibling.disabled = true; } & Lt; / Script & gt;

Was it not working Can someone help me?

Try it Next to the next symboling in the text nodes (including spaces) , But is not the next element sibling . 

  function disable input (element) {element.parentNode NextElementSibling.disabled = true; }

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