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Как отменить действие по повторному нажатию на кнопку?



На странице есть картинка с кнопками. При нажатии на кнопку - выводиться номер забронированного места (id кнопки в текстовое поле рядом). Как при повторном нажатии на туже кнопку стереть из поля последнее выбранное место?

<script type="text/javascript">
   function Bron(event)
       $id_cnopka = event.target.id;



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50 минут назад, klierik сказал:
if (document.getElementById('input-bron').value == '') {
  document.getElementById('input-bron').value = document.getElementById('input-bron').value + $id_cnopka;
} else {
  document.getElementById('input-bron').value = ''


Тогда действие отменяется при нажатии на любую кнопку, а у меня там 34 кнопки.....

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