/*

 * Auto-completing page/username fields

 */

// The ultimate Javascript app: AJAX auto-completion, which responds to up/down arrow keys, the enter key, and the escape key

// The idea was pilfered mercilessly from vBulletin, but uses about 8

// bytes of vB code. All the rest was coded by me, Mr. Javascript Newbie...

// ...in about 8 hours.

// You folks better like this stuff.

function nameCompleteEventHandler(e)

{

  if(!e) e = window.event;

  switch(e.keyCode)

  {

    case 38: // up

      unSelectMove('up');

      break;

    case 40: // down

      unSelectMove('down');

      break;

    case 27: // escape

    case 9:  // tab

      destroyUsernameDropdowns();

      break;

    case 13: // enter

      unSelect();

      break;

    default: return false; break;

  }

  return true;

}

function unSelectMove(dir)

{

  if(submitAuthorized) return false;

  var thediv = document.getElementById(unObjDivCurrentId);

  thetable = thediv.firstChild;

  cel = thetable.firstChild.firstChild;

  d = true;

  index = false;

  changed = false;

  // Object of the game: extract the username, determine its index in the userlist array, and then color the menu items and set unObjCurrentSelection

  while(d) // Set to false if an exception occurs or if we arrive at our destination

  {

    //*

    if(!cel) d=false;

    celbak = cel;

    cel = cel.nextSibling;

    if(!cel) d=false;

    try {

      if(cel.firstChild.nextSibling) html = cel.firstChild.nextSibling.innerHTML;

      else html = cel.firstChild.innerHTML;

      cel.firstChild.className = 'row1';

      if(cel.firstChild.nextSibling) cel.firstChild.nextSibling.className = 'row1';

      thename = html.substr(7, html.length-15);

      // FINALLY! we have extracted the username

      // Now get its position in the userlist array

      if(thename == unObjCurrentSelection)

      {

        index = parseInt(in_array(thename, userlist));

      }

      if(typeof(index) == 'number')

      {

        if(dir=='down')

          n = index+1;

        else if(dir == 'up')

          n = index - 1;

        // Try to trap moving the selection up or down beyond the top of bottom

        if(n > userlist.length-1 || n < 0)

        {

          cel.firstChild.className = 'row2';

          if(cel.firstChild.nextSibling) cel.firstChild.nextSibling.className = 'row2';

          return;

        }

        if(dir=='down') no=cel.nextSibling;

        else if(dir=='up') no=cel.previousSibling;

        no.firstChild.className = 'row2';

        if(no.firstChild.nextSibling) no.firstChild.nextSibling.className = 'row2';

        if(no.firstChild.id)

        {

          scroll = getScrollOffset() + getHeight();

          elemht = getElementHeight(no.firstChild.id);

          elemoff = fetch_offset(no.firstChild);

          whereto = elemoff['top'] + elemht;

          if(whereto > scroll)

          {

            window.location.hash = '#'+no.firstChild.id;

            unObj.focus();

          }

        }

        cel=cel.nextSibling;

        unObjCurrentSelection = userlist[n];

        index = false;

        changed = true;

        return;

      }

    } catch(e) { }

    //*/ d = false;

  }

}

function unSelect()

{

  if(!unObj || submitAuthorized) return false;

  if ( unObjCurrentSelection )

    unObj.value = unObjCurrentSelection;

  destroyUsernameDropdowns(); 

}

function in_array(needle, haystack)

{

  for(var i in haystack)

  {

    if(haystack[i] == needle) return i;

  }

  return false;

}

function ajaxUserNameComplete(o)

{

  if(!o) {destroyUsernameDropdowns(); return;}

  if(!o.value) {destroyUsernameDropdowns(); return;}

  if(o.value.length < 3) {destroyUsernameDropdowns(); return;}

  //if(IE) return; // This control doesn't work in IE. Yes, it's true! document.createElement doesn't work.

  if(!o.id)

  {

    o.id = 'usernametextboxobj_' + Math.floor(Math.random() * 10000000);

  }

  unObj = o;

  o.setAttribute("autocomplete","off");

  o.onkeyup = function(e, o) { o=unObj; if(!nameCompleteEventHandler(e)) ajaxUserNameComplete(o); }

  val = escape(o.value).replace('+', '%2B');

  ajaxGet(stdAjaxPrefix+'&_mode=fillusername&name='+val, function()

    {

      if(ajax.readyState==4)

      {

        // Determine the appropriate left/top positions, then create a div to use for the drop-down list

        // The trick here is to be able to make the div dynamically destroy itself depending on how far the user's mouse is from it

        destroyUsernameDropdowns();

        off = fetch_offset(unObj);

        dim = fetch_dimensions(unObj);

        left = off['left'];

        i1 = off['top'];

        i2 = dim['h'];

        var top = 0;

        top = i1 + i2;

        var thediv = document.createElement('div');

        thediv.className = 'tblholder';

        thediv.style.marginTop = '0px';

        thediv.style.position = 'absolute';

        thediv.style.top  = top  + 'px';

        thediv.style.left = left + 'px';

        thediv.style.zIndex = getHighestZ() + 2;

        id = 'usernamehoverobj_' + Math.floor(Math.random() * 10000000);

        unObjDivCurrentId = id;

        thediv.id = id;

        unObj.onblur = function() { destroyUsernameDropdowns(); }

        var response = String(ajax.responseText) + ' ';

        if ( response.substr(0,1) != '{' )

        {

          new messagebox(MB_OK|MB_ICONSTOP, 'Invalid response', 'Invalid or unexpected JSON response from server:<pre>' + ajax.responseText + '</pre>');

          return false;

        }

        response = parseJSON(response);

        var errorstring = false;

        if ( response.mode == 'error' )

        {

          errorstring = response.error;

        }

        else

        {

          var userlist = response.users_real;

        }

        if(errorstring)

        {

          html = '<span style="color: #555; padding: 4px;">'+errorstring+'</span>';

        }

        else

        {

          html = '<table border="0" cellspacing="1" cellpadding="3" style="width: auto;"><tr><th><small>Username matches</small></th></tr>';

          cls = 'row2';

          unObjCurrentSelection = userlist[0];

          for(i=0;i<userlist.length;i++)

          {

            tmpnam = 'listobjnode_'+Math.floor(Math.random() * 10000000);

            html = html + '<tr><td id="'+tmpnam+'" class="'+cls+'" style="cursor: pointer;" onclick="document.getElementById(\''+unObj.id+'\').value=\''+userlist[i]+'\';destroyUsernameDropdowns();"><small>'+userlist[i]+'</small></td></tr>';

            if(cls=='row2') cls='row1';

          }

          html = html + '</table>';

        }

        thediv.innerHTML = html;

        var body = document.getElementsByTagName('body');

        body = body[0];

        unSelectMenuOn = true;

        submitAuthorized = false;

        body.appendChild(thediv);

      }

    });

}

function ajaxPageNameComplete(o)

{

  if(!o) {destroyUsernameDropdowns(); return;}

  if(!o.value) {destroyUsernameDropdowns(); return;}

  if(o.value.length < 3) {destroyUsernameDropdowns(); return;}

  if(IE) return; // This control doesn't work in IE. Yes, it's true! document.createElement doesn't work.

  if(!o.id)

  {

    o.id = 'usernametextboxobj_' + Math.floor(Math.random() * 10000000);

  }

  o.setAttribute("autocomplete","off");

  unObj = o;

  o.onkeyup = function(e, o) { o=unObj; if(!nameCompleteEventHandler(e)) ajaxPageNameComplete(o); }

  val = escape(o.value).replace('+', '%2B');

  ajaxGet(stdAjaxPrefix+'&_mode=fillpagename&name='+val, function()

    {

      if(!ajax) return;

      if(ajax.readyState==4)

      {

        // Determine the appropriate left/top positions, then create a div to use for the drop-down list

        // The trick here is to be able to make the div dynamically destroy itself depending on how far the user's mouse is from it

        destroyUsernameDropdowns();

        off = fetch_offset(unObj);

        dim = fetch_dimensions(unObj);

        left = off['left'];

        top = off['top'] + dim['h'];

        var thediv = document.createElement('div');

        thediv.className = 'tblholder';

        thediv.style.marginTop = '0px';

        thediv.style.position = 'absolute';

        thediv.style.top  = top  + 'px';

        thediv.style.left = left + 'px';

        thediv.style.zIndex = getHighestZ() + 2;

        id = 'usernamehoverobj_' + Math.floor(Math.random() * 10000000);

        unObjDivCurrentId = id;

        thediv.id = id;

        eval(ajax.responseText);

        if(errorstring)

        {

          html = '<span style="color: #555; padding: 4px;">'+errorstring+'</span>';

        }

        else

        {

          html = '<table border="0" cellspacing="1" cellpadding="3" style="width: auto;"><tr><th colspan="2">Page name matches</th></tr><tr><th><small>Page title</small></th><th><small>Page ID</small></th></tr>';

          cls = 'row2';

          unObjCurrentSelection = userlist[0];

          for(i=0;i<userlist.length;i++)

          {

            tmpnam = 'listobjnode_'+Math.floor(Math.random() * 10000000);

            html = html + '<tr><td id="'+tmpnam+'" class="'+cls+'" style="cursor: pointer;" onclick="document.getElementById(\''+unObj.id+'\').value=\''+userlist[i]+'\';destroyUsernameDropdowns();"><small>'+namelist[i]+'</small></td><td class="'+cls+'" style="cursor: pointer;" onclick="document.getElementById(\''+unObj.id+'\').value=\''+userlist[i]+'\';destroyUsernameDropdowns();"><small>'+userlist[i]+'</small></td></tr>';

            if(cls=='row2') cls='row1';

          }

          html = html + '</table>';

        }

        thediv.innerHTML = html;

        var body = document.getElementsByTagName('body');

        body = body[0];

        unSelectMenuOn = true;

        submitAuthorized = false;

        body.appendChild(thediv);

      }

    });

}

function destroyUsernameDropdowns()

{

  var divs = document.getElementsByTagName('div');

  var prefix = 'usernamehoverobj_';

  for(i=0;i<divs.length;i++)                                                                                                                                                                                                                         

  {

    if ( divs[i].id )

    {

      if(divs[i].id.substr(0, prefix.length)==prefix)

      {

        divs[i].innerHTML = '';

        divs[i].style.display = 'none';

      }

    }

  }

  unSelectMenuOn = false;

  unObjDivCurrentId = false;

  unObjCurrentSelection = false;

  submitAuthorized = true;

}

function get_parent_form(o)

{

  if ( !o.parentNode )

    return false;

  if ( o.tagName == 'FORM' )

    return o;

  var p = o.parentNode;

  while(true)

  {

    if ( p.tagName == 'FORM' )

      return p;

    else if ( !p )

      return false;

    else

      p = p.parentNode;

  }

}