Initial auto-save checkin code from DarkCryst. No bug reports on it yet! Several known issues, including deleting cookies, moving the restore button, and other behavior probs.

git-svn-id: http://svn.automattic.com/wordpress/trunk@2536 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/admin-footer.php

@@ -9,5 +9,11 @@
 
 <?php do_action('admin_footer', ''); ?>
 
+<?php if ( isset( $editing ) ) : ?>
+<script type="text/javascript">
+WhenLoaded();
+</script> 
+<?php endif; ?>
+
 </body>
 </html>

wp-admin/admin-header.php

@@ -78,6 +78,80 @@ function blurry() {
 window.onload = blurry;
 <?php endif; ?>
 
+<?php if ( isset( $editing ) ) : ?>
+var elem;
+var eID = 'content';
+var cID = 'twWPAutoSave';
+
+function createCookie(name,value,days){
+	if (days)
+	{
+		var date = new Date();
+		date.setTime(date.getTime()+(days*24*60*60*1000));
+		var expires = "; expires="+date.toGMTString();
+	}
+	else var expires = "";
+	document.cookie = name + "=" + escape(value ) + expires + "; path=/";
+}
+
+function eraseCookie(name){
+	createCookie(name,"",-1);
+}
+
+function readCookie(name)
+{
+    var dc = document.cookie;
+    var prefix = name + "=";
+    var begin = dc.indexOf("; " + prefix);
+    if (begin == -1)
+    {
+        begin = dc.indexOf(prefix);
+        if (begin != 0) return null;
+    }
+    else
+    {
+        begin += 2;
+    }
+    var end = document.cookie.indexOf(";", begin);
+    if (end == -1)
+    {
+        end = dc.length;
+    }
+    return unescape(dc.substring(begin + prefix.length, end));
+}
+
+function KeyPressEvent(event){
+	if (document.all) {
+		event = window.event;
+	}
+	if (event.which){
+		key = event.which;
+	} else {
+		key = event.keyCode;
+	}
+	createCookie(cID,elem.value, 7)
+}
+
+function WhenLoaded(){
+var postdiv;
+	if (postdiv = document.getElementById('poststuff')){
+		var data = postdiv.innerHTML
+		var index = data.indexOf('<p class="submit">') + 18;
+		var after = data.substring(index);
+		var before = data.substring(0, index);
+		postdiv.innerHTML = before + '<input type="submit" id="AutoRestore" value="Restore" onclick="restoreData(); return false;" />' + after;
+
+		edCanvas = document.getElementById('content');  //re-enable quicktags with correct element (original content element was overwritten).
+		
+		elem = document.getElementById('content');
+		elem.onkeyup = KeyPressEvent;
+	}
+}
+
+function restoreData(){
+	elem.value = readCookie(cID);
+}
+<?php endif; ?>
 //]]>
 </script>
 

wp-admin/post.php

@@ -25,6 +25,8 @@ $action = "delete";
 	// Fix submenu highlighting for pages.
 if (false !== strpos($_SERVER['HTTP_REFERER'], 'edit-pages.php')) $submenu_file = 'page-new.php';
 
+$editing = true;
+
 switch($action) {
 case 'post':