X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fon-line%2Fjavascript%2Futils.js;h=bb018ad0edee4cd57d1485bbf06a3a2b912eee61;hb=d2c60bae1c4badba0a0f29e3fd2faed6d3a1869e;hp=1b637dcf484555435f449e4625f4a699f85662e0;hpb=ded9a65d38ae45de20036627c8fd5e83ff201688;p=helm.git

diff --git a/helm/on-line/javascript/utils.js b/helm/on-line/javascript/utils.js
index 1b637dcf4..bb018ad0e 100644
--- a/helm/on-line/javascript/utils.js
+++ b/helm/on-line/javascript/utils.js
@@ -3,19 +3,41 @@ function chopSlash(url)
   return url.slice(0,url.lastIndexOf('/'));
 }
 
-function setParam(url,name,value)
+function dropParam(url,name)
 {
   var urla = url.split("?");
   var search = urla[1];
   var args = search.split("&");
+  var newargs = new Array();
+  var j = 0;
 
   for (var i = 0 ; i < args.length ; i++) {
      var couple = args[i].split("=");
-     if (couple[0] == name) args[i] = name + "=" + value;
+     if (couple[0] != name) {
+        newargs[j] = args[i];
+        j++;
+     }
   }
 
+  return (urla[0] + "?" + newargs.join("&"));
+}
+
+function setParam(url,name,value)
+{
+  var urla = url.split("?");
+  var search = urla[1];
+  var args = search.split("&");
+  var found = false;
+
+  for (var i = 0 ; i < args.length ; i++) {
+     var couple = args[i].split("=");
+     if (couple[0] == name) {
+        found = true;
+        args[i] = name + "=" + value;
+     }
+  }
 
-  return (urla[0] + "?" + args.join("&"));
+  return (urla[0] + "?" + args.join("&") + (found ? "" : ("&" + name + "=" + value)));
 }
 
 function extractParam(url,name)
@@ -35,10 +57,8 @@ function extractParam(url,name)
   return value;
 }
 
-function getParam(name)
+function getParam0(search,name)
 {
-  var search = location.search;
-  search = search.slice(1);
   var args = search.split("&");
   var value = "???";
 
@@ -52,6 +72,23 @@ function getParam(name)
   return value;
 }
 
+function getParam(name)
+{
+  return getParam0(location.search.slice(1),name);
+}
+
+function getParam2(name)
+{
+  var url = unescape(getParam('xmluri'));
+  var tmp = url.split("?");
+
+  if (tmp.length > 1)
+     return getParam0(tmp[1],name);
+  else
+     return getDefaultParam(name);
+}
+
+
 function outputOption(doc, value, content, selected)
 {
   doc.write("<option value=\"" + value + "\" ");