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Demo für Offline-Webanwendung
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| <!DOCTYPE html> | |
| <html manifest="beispiel.appcache"> | |
| <body> | |
| <div id="ajax_container"> | |
| </div> | |
| <button type="button" onclick="loadContent()">Inhalte nachladen</button> | |
| <script> | |
| function loadContent() { | |
| var xhttp = new XMLHttpRequest(); | |
| xhttp.onreadystatechange = function() { | |
| if (this.readyState == 4 && this.status == 200) { | |
| document.getElementById("ajax_container").innerHTML = this.responseText; | |
| } | |
| }; | |
| xhttp.open("GET", "zeit.php", true); | |
| xhttp.send(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| CACHE MANIFEST | |
| #1.1.2018 12:00:00 | |
| CACHE: | |
| index.htm | |
| style.css | |
| script.js | |
| NETWORK: | |
| uhrzeit.php | |
| FALLBACK: | |
| / nicht_erreichbar.htm |
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| <html manifest="beispiel.appcache"> | |
| <body> | |
| <button type="button" onclick="updateCache()">Update auslösen</button> | |
| <script> | |
| function updateCache() { | |
| window.applicationCache.update(); | |
| } | |
| window.applicationCache.addEventListener("updateready", function(e) { | |
| if (window.applicationCache.UPDATEREADY) { | |
| window.applicationCache.swapCache(); | |
| window.location.reload(); | |
| } | |
| }, false); |
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| if (!("indexedDB" in window)) { | |
| alert("Wird nicht unterstützt."); | |
| return; | |
| } | |
| var idb = indexedDB.open("demo",1); | |
| idb.onupgradeneeded = function() { | |
| var db = this.result; | |
| store = db.createObjectStore | |
| ("beispiel", { | |
| keyPath: "id", | |
| autoIncrement: true | |
| }); | |
| } | |
| }; |
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| request.onsuccess = function(){ | |
| var inhalt = { vorname: 'Hans', | |
| nachname: 'Muster' }; | |
| var statement = this.result.transaction(['beispiel'], 'readwrite'); | |
| var ergebnis =statement.objectStore('beispiel').put(inhalt); | |
| } |
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| <?php | |
| //Diese Datei simuliert eine instabile Verbindung. Das Ergebnis ist entweder die aktuelle Uhrzeit oder ein Fehler 404 | |
| $zufall = rand(0,10); | |
| if($zufall >7){ | |
| header("HTTP/1.0 404 Not Found"); | |
| exit; | |
| } | |
| echo date("d.m.Y - H:i:s"); |
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Beispiel-Code zum Einsatz von Application Cache und IndexedDB.
Bitte beachten: Damit der Cache genutzt werden kann, müssen alle im Manifest geforderten Dateien existieren. Legen Sie ggf. leere Dateien für stlye.css und script.js an.