[Instiki] delay in prototype.js ajax calls?

Fri Oct 28 07:01:40 EDT 2005

Hello instiki users,

  I am using i2 as a wiki and i added some live preview to the wiki
  editor. The only Problem with live preview is that if i type fast in
  the editor it fires lots of http posts.

  You can have a look at the editor under:
  http://p2.granul.at/wiki/pages/Sandbox

  So i thought if there would be a possibility to delay the ajax call.
  I know how to delay a javascript call so that only the last call
  within a time interval gets called. But it seems awfully complicated
  to me to apply this to the prototype library.

  Example for a page doing a delay (opens a popup on the last click
  within one second):
  ---------
<html>
<head>
<script language="javascript">
var onceafter_requests=0;

function onceafter(time)
{
  onceafter_requests++;
  debug(onceafter_requests);
  setTimeout("trytodo()",time);
} 

function trytodo()
{
  onceafter_requests--;
  debug("-"+onceafter_requests);
  if(onceafter_requests == 0) alert("now!");
}
function debug(str)
{
  var dbgObj = document.getElementById("dbg");
  dbgObj.innerHTML = (dbgObj.innerHTML + str + "<br>");
}
</script>
</head>
<body>
<form>
<input type="button" value="Push this button to open an alert box for the last click within 1 second" onClick="onceafter(1000);">
</form>
<div id="dbg"></div>
</body>
</html>
-----

Anyone got an idea if this pattern could be applied to the prototype
ajax library and how?

cheers
roman seidl

P.S.: If someone wants to see this editor in i2 i can send a patch or
so. IŽ am actually working on combining i2 and collaboa and so my
pathces to i2 go far beyond the editor.