js/testledC.js

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/*
 * testledC.js
 *
 * Copyright (C) 2016 Ing. Stefano Salvi<stefano@salvi.mn.it>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

function testLed() {
  var httpReq = new XMLHttpRequest();

  httpReq.onreadystatechange = function() {
    if (httpReq.readyState == 4 && httpReq.status == 200) {
      var disp = document.getElementById("showbutton");
      if (httpReq.responseText.indexOf('0') !== -1) {
        disp.className = 'off';
      } else {
        disp.className = 'on';
      }
    }
  };
  httpReq.open("GET", "/cHW/testbutton.php", true);
  httpReq.send();
}