1 files changed, 122 insertions, 0 deletions
diff --git a/lib/scripts/localdraft.js b/lib/scripts/localdraft.js
new file mode 100644
index 000000000..018b37b5e
--- /dev/null
+++ b/lib/scripts/localdraft.js
@@ -0,0 +1,122 @@
+var localdraft = {
+    $form: null,
+    timer: null,
+
+    init: function () {
+        if (!localdraft.supports_html5_storage()) {
+            return;
+        }
+
+        localdraft.$form = jQuery('#dw__editform');
+        if (localdraft.$form.length) {
+            // register draft saving
+            jQuery('#wiki__text').keyup(function () {
+                // save after 500ms iactivity
+                if (localdraft.timer) window.clearTimeout(localdraft.timer);
+                localdraft.timer = window.setTimeout(localdraft.saveDraft, 500);
+            });
+        } else {
+            localdraft.clearSavedDraft();
+            // if a draft still exists it needs to be sent to the server
+            localdraft.saveRemoteDraft();
+        }
+    },
+
+    /**
+     * Check if localstorage is available
+     *
+     * @returns {boolean}
+     */
+    supports_html5_storage: function () {
+        try {
+            return 'localStorage' in window && window['localStorage'] !== null;
+        } catch (e) {
+            return false;
+        }
+    },
+
+    /**
+     * deletes a draft that has been successfully saved already
+     *
+     * It compares the last save date with the date of the revision the draft was editing.
+     * So this behaves similar to the remote drafts in that a draft will be deleted when
+     * someone else edited the page meanwhile
+     */
+    clearSavedDraft: function () {
+        var draft_date = window.localStorage.getItem('draft_date-' + JSINFO.id);
+        if (draft_date && draft_date < JSINFO['lastmod']) {
+            localdraft.removeDraft();
+        }
+    },
+
+    /**
+     * remove local draft of the local page
+     */
+    removeDraft: function () {
+        window.localStorage.removeItem('draft_text-' + JSINFO.id);
+        window.localStorage.removeItem('draft_date-' + JSINFO.id);
+    },
+
+    /**
+     * Save the current page in the local draft
+     */
+    saveDraft: function () {
+        console.log('sving draft');
+
+        var page =
+            localdraft.$form.find('input[name=id]').val();
+
+        var state =
+            localdraft.$form.find('input[name=prefix]').val() +
+            localdraft.$form.find('textarea[name=wikitext]').val() +
+            localdraft.$form.find('input[name=suffix]').val();
+
+        var date =
+            localdraft.$form.find('input[name=date]').val();
+
+        window.localStorage.setItem('draft_text-' + page, state);
+        window.localStorage.setItem('draft_date-' + page, date);
+
+    },
+
+    /**
+     * Saves the locally stored draft (if any) to the server
+     */
+    saveRemoteDraft: function () {
+        console.log('getDraft' + JSINFO.id);
+
+        var draft_text = window.localStorage.getItem('draft_text-' + JSINFO.id);
+        var draft_date = window.localStorage.getItem('draft_date-' + JSINFO.id);
+
+        if (draft_date && draft_text) {
+            var params = {
+                'call':     'lock',
+                'id':       JSINFO.id,
+                'prefix':   '',
+                'wikitext': draft_text,
+                'suffix':   '',
+                'date':     draft_date
+            };
+
+            jQuery.post(
+                    DOKU_BASE + 'lib/exe/ajax.php',
+                params,
+                localdraft.onRemoteDraftSave(),
+                'html'
+            );
+
+        }
+    },
+
+    /**
+     * Callback when the data has been saved
+     * @param data
+     */
+    onRemoteDraftSave: function (data) {
+        localdraft.removeDraft();
+        // page's draft status might have changed, reload
+        document.location.reload();
+    }
+};
+
+jQuery(localdraft.init);
+\ No newline at end of file