Select all values from list box in a single click using javascript

     The following example code will help you to select all or deselect all the items from list box using javascript code.

    function listboxSelectDeselect(listID, isSelect) {

      var listbox = document.getElementById(listID);

      for (var count = 0; count < listbox.options.length; count++) {

        listbox.options[count].selected = isSelect;

      }

    }

Example Program:- (Editor)

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Output:-

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