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Un simple JavaScript pour vérifier en ligne/hors ligne de la page, de vérifier certains des noms de domaine.

Label: en ligne, offline, vérificateur, nom de domaine

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<script type="text/javascript">
// Created by: Mr J | http://www.huntingground.net/

function chk_url() {
  url=unescape(document.location)

  // enter the URL below you want to check
  if(url.indexOf("javascript.internet.com")!= -1){ // if this string is found
    alert("You are online") // do this if online
  } else {
    alert("You are offline") // do this if offline
  }
}

// Multiple onload function created by: Simon Willison
// http://simon.incutio.com/archive/2004/05/26/addLoadEvent
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(function() {
  chk_url();
});
</script>