scripts/ajax.js
author Dan
Fri, 25 Apr 2008 14:48:23 -0400
changeset 19 75dd71fe35b2
parent 18 69af47034212
child 21 74edc873234f
permissions -rw-r--r--
Added the "powered by" link and rebranded as 0.1 alpha 1
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/**
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 * AJAX functions
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 * 
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 * Greyhound - real web management for Amarok
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 * Copyright (C) 2008 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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var ajax;
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var is_playing = false, current_track = -1, current_track_length, current_track_pos, ct_advance_timeout = false, ct_counter = false, playlist_md5 = false, first_load = true;
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var onload_hooks = new Array();
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function addOnloadHook(func)
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{
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  if ( typeof ( func ) == 'function' )
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  {
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    if ( typeof(onload_hooks.push) == 'function' )
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    {
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      onload_hooks.push(func);
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    }
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    else
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    {
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      onload_hooks[onload_hooks.length] = func;
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    }
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  }
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}
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function runOnloadHooks(e)
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{
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  var _errorTrapper = 0;
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  for ( var _oLc = 0; _oLc < onload_hooks.length; _oLc++ )
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  {
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    _errorTrapper++;
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    if ( _errorTrapper >= 1000 )
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      break;
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    var _f = onload_hooks[_oLc];
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    if ( typeof(_f) == 'function' )
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    {
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      _f(e);
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    }
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  }
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}
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function ajaxGet(uri, f)
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{
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  if (window.XMLHttpRequest)
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  {
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    ajax = new XMLHttpRequest();
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  }
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  else
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  {
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    if (window.ActiveXObject) {           
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      ajax = new ActiveXObject("Microsoft.XMLHTTP");
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    }
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    else
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    {
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      alert('AmaroK client-side runtime error: No AJAX support, unable to continue');
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      return;
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    }
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  }
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  ajax.onreadystatechange = f;
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  ajax.open('GET', uri, true);
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  ajax.setRequestHeader( "If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT" );
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  ajax.send(null);
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}
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function ajaxPost(uri, parms, f)
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{
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  if (window.XMLHttpRequest)
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  {
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    ajax = new XMLHttpRequest();
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  }
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  else
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  {
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    if (window.ActiveXObject)
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    {           
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      ajax = new ActiveXObject("Microsoft.XMLHTTP");
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    }
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    else
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    {
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      alert('AmaroK client-side runtime error: No AJAX support, unable to continue');
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      return;
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    }
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  }
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  ajax.onreadystatechange = f;
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  ajax.open('POST', uri, true);
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  ajax.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
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  // Setting Content-length in Safari triggers a warning
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  if ( !is_Safari )
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  {
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    ajax.setRequestHeader("Content-length", parms.length);
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  }
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  ajax.setRequestHeader("Connection", "close");
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  ajax.send(parms);
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}
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function setAjaxLoading()
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{
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  $('ajax_status').object.src = img_ajax;
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  $('ajax_status').object.style.display = 'block';
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}
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function unsetAjaxLoading()
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{
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  $('ajax_status').object.src = 'about:blank';
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  $('ajax_status').object.style.display = 'none';
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}
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var refresh_playlist = function()
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{
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  setAjaxLoading();
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  ajaxGet('/action.json/refresh', function()
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    {
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      if ( ajax.readyState == 4 && ajax.status == 200 )
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      {
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        unsetAjaxLoading();
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        var response = (' ' + ajax.responseText).substr(1);
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        // quickie JSON parser :)
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        response = eval('(' + response + ')');
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        // has the playlist been modified?
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        if ( playlist_md5 )
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        {
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          if ( response.playlist_hash != playlist_md5 )
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          {
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            // playlist has changed, reload
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            window.location.reload();
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            return false;
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          }
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        }
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        playlist_md5 = response.playlist_hash;
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        // update track number
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        if ( response.current_track != current_track )
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        {
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          var ot_id = 'track_' + current_track;
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          var nt_id = 'track_' + response.current_track;
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          current_track = response.current_track;
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          if ( $(ot_id).hasClass('current') )
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          {
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            $(ot_id).rmClass('current');
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          }
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          if ( ! $(nt_id).hasClass('current') )
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          {
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            $(nt_id).addClass('current');
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          }
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          pulsar_reset();
2
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        }
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        // update playing status
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        is_playing = response.is_playing;
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        if ( allow_control )
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        {
3
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          var img = $('btn_playpause').object.getElementsByTagName('img')[0];
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          if ( is_playing )
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          {
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            img.src = img_pause;
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          }
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          else
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          {
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            img.src = img_play;
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          }
2
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        }
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        // update volume
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        if ( response.volume != current_volume )
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        {
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          set_volume_fill(response.volume);
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          current_volume = response.volume;
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        }
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        // auto-refresh on track advance
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        if ( ct_advance_timeout )
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        {
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          clearTimeout(ct_advance_timeout);
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        }
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        // countdown/up timer
2
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        var time_remaining = response.current_track_length - response.current_track_pos;
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        current_track_length = response.current_track_length;
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        current_track_pos = response.current_track_pos;
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        if ( ct_counter )
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          clearInterval(ct_counter);
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        update_clock();
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        // set page title
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        updateTitle(response.current_track_artist, response.current_track_album, response.current_track_title);
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        // if not playing, set the position slider to zero
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        if ( !is_playing )
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        {
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          posslide_set_position(0);
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        }
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        // set advance timer
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        if ( is_playing && time_remaining > 0 )
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        {
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          ct_advance_timeout = setTimeout(refresh_playlist, ( 1000 * time_remaining ));
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          ct_counter = setInterval(update_clock, 1000);
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        }
5
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        if ( first_load )
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        {
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          first_load = false;
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          jump_current_track();
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        }
2
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      }
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    });
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}
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function player_action(action)
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{
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  var act2 = action;
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  setAjaxLoading();
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  ajaxGet('/action.json/' + action, function()
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    {
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      if ( ajax.readyState == 4 && ajax.status == 200 )
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      {
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        unsetAjaxLoading();
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        refresh_playlist();
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      }
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    });
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}
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function jump_to_song(tid)
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{
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  setAjaxLoading();
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  if ( tid == current_track )
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    return false;
3
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  if ( !allow_control )
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    return false;
2
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  ajaxGet('/action.json/jump/' + tid, function()
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    {
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      if ( ajax.readyState == 4 && ajax.status == 200 )
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      {
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        unsetAjaxLoading();
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        var response = (' ' + ajax.responseText).substr(1);
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        // quickie JSON parser :)
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        response = eval('(' + response + ')');
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        // update track number
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        var ot_id = 'track_' + current_track;
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        var nt_id = 'track_' + tid;
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        current_track = tid;
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        if ( $(ot_id).hasClass('current') )
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        {
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          $(ot_id).rmClass('current');
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   247
        }
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        if ( ! $(nt_id).hasClass('current') )
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        {
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          $(nt_id).addClass('current');
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        }
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        // update pulsar
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        pulsar_reset();
2
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        // update playing status
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        var img = $('btn_playpause').object.getElementsByTagName('img')[0];
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        is_playing = true;
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        img.src = img_play;
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        // auto-refresh on track advance
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        if ( ct_advance_timeout )
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        {
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          clearTimeout(ct_advance_timeout);
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        }
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        if ( ct_counter )
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          clearInterval(ct_counter);
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        var time_remaining = response.current_track_length - response.current_track_pos;
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        current_track_length = response.current_track_length;
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        current_track_pos = response.current_track_pos;
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        if ( is_playing )
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        {
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          ct_advance_timeout = setTimeout(refresh_playlist, ( 1000 * time_remaining ));
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          update_clock();
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          ct_counter = setInterval(update_clock, 1000);
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        }
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        updateTitle(response.current_track_artist, response.current_track_album, response.current_track_title);
2
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      }
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    });
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}
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10
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function set_playback_position(pos)
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{
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  pos = Math.round(( pos / 100 ) * current_track_length);
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  setAjaxLoading();
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  if ( !allow_control )
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    return false;
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  ajaxGet('/action.json/seek/' + pos, function()
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    {
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      if ( ajax.readyState == 4 && ajax.status == 200 )
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      {
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        unsetAjaxLoading();
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        current_track_pos = pos;
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        update_clock();
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      }
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    });
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}
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2
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function update_clock()
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{
10
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   298
  posslide_set_position((100 * (current_track_pos / current_track_length)));
2
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   299
  var str = secs_to_string(current_track_pos) + '/' + secs_to_string(current_track_length);
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   300
  $('playmeter').object.innerHTML = str;
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   301
  current_track_pos++;
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diff changeset
   302
}
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diff changeset
   303
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   304
function secs_to_string(time)
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diff changeset
   305
{
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diff changeset
   306
  var count_seconds = time % 60;
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diff changeset
   307
  var count_minutes = ( time - count_seconds ) / 60;
13
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   308
  if ( isNaN(count_seconds) )
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   309
    count_seconds = 0;
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   310
  if ( isNaN(count_minutes) )
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diff changeset
   311
    count_minutes = 0;
2
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   312
  return fill_zeroes(count_minutes) + ':' + fill_zeroes(count_seconds);
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diff changeset
   313
}
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diff changeset
   314
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diff changeset
   315
function fill_zeroes(str, len)
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   316
{
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diff changeset
   317
  if ( !len )
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diff changeset
   318
    len = 2;
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diff changeset
   319
  if ( typeof(str) == 'number' && str == 0 )
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diff changeset
   320
    str = '0';
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diff changeset
   321
  str = String(str);
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diff changeset
   322
  while ( str.length < len )
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Dan
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diff changeset
   323
  {
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diff changeset
   324
    str = '0' + str;
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diff changeset
   325
  }
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diff changeset
   326
  return str;
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diff changeset
   327
}
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diff changeset
   328
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   329
setInterval(refresh_playlist, 10000);
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diff changeset
   330
10
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   331
window.onload = function(e)
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diff changeset
   332
{
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   333
  runOnloadHooks(e);
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diff changeset
   334
}
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diff changeset
   335
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diff changeset
   336
addOnloadHook(refresh_playlist);
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diff changeset
   337
14
7a1573676cc4 Added jump-to-current function in iphone theme; fixed md5('') call if unique IDs empty in playlist XML file
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diff changeset
   338
// scroll to the current track
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diff changeset
   339
function jump_current_track()
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diff changeset
   340
{
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diff changeset
   341
  var top = $('track_' + current_track).Top() - 138;
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diff changeset
   342
  window.scroll(0, top);
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diff changeset
   343
  if ( typeof(fix_scroll) == 'function' )
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diff changeset
   344
  {
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   345
    fix_scroll();
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diff changeset
   346
  }
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diff changeset
   347
}
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diff changeset
   348
11
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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   349
// pulse the current track
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diff changeset
   350
var pulsar_current = 0, pulsar_tdlist = [], pulsar_direction = 1;
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diff changeset
   351
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diff changeset
   352
var pulsar_reset = function()
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diff changeset
   353
{
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diff changeset
   354
  // remove any pulsar classes from items that aren't "current"
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   355
  var boobylist = document.getElementsByTagName('tr');
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diff changeset
   356
  for ( var i = 0; i < boobylist.length; i++ )
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diff changeset
   357
  {
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diff changeset
   358
    var booby = boobylist[i];
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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diff changeset
   359
    var match = booby.className.match(/(^| )(pulsar[0-9])( |$)/);
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diff changeset
   360
    if ( match && !$(booby).hasClass('current') )
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diff changeset
   361
    {
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diff changeset
   362
      $(booby).rmClass(match[2]);
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diff changeset
   363
    }
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diff changeset
   364
  }
13
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diff changeset
   365
  // recalculate list of rows that should pulse
11
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diff changeset
   366
  var tdlist_new = document.getElementsByClassName('current', 'tr');
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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diff changeset
   367
  if ( pulsar_current == 0 && tdlist_new == pulsar_tdlist )
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diff changeset
   368
  {
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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diff changeset
   369
    return true;
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diff changeset
   370
  }
13
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diff changeset
   371
  // reset everything to 0
11
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diff changeset
   372
  pulsar_tdlist = tdlist_new;
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diff changeset
   373
  pulsar_current = 0;
13
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diff changeset
   374
  pulsar_direction = 1;
11
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diff changeset
   375
  for ( var i = 0; i < pulsar_tdlist.length; i++ )
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Dan
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diff changeset
   376
  {
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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diff changeset
   377
    var td = pulsar_reset[i];
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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diff changeset
   378
    for ( var i = 1; i < 10; i++ )
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
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diff changeset
   379
    {
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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diff changeset
   380
      if ( $(td).hasClass('pulsar' + i) )
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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diff changeset
   381
      {
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
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diff changeset
   382
        $(td).rmClass('pulsar' + i);
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
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diff changeset
   383
      }
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   384
    }
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
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diff changeset
   385
    if ( ! $(td).hasClass('pulsar0') )
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   386
    {
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
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diff changeset
   387
      $(td).addClass('pulsar0');
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
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diff changeset
   388
    }
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   389
  }
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   390
}
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   391
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   392
var pulsar_advance = function()
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   393
{
13
b5db2345c397 Added PHP feature check to prevent script from throwing unneeded exceptions on unsupported PHP configurations
Dan
parents: 11
diff changeset
   394
  // this should be as optimized as possible, it should use a precalculated
b5db2345c397 Added PHP feature check to prevent script from throwing unneeded exceptions on unsupported PHP configurations
Dan
parents: 11
diff changeset
   395
  // list of elements to pulse and whatnot... heck even right now it's not
b5db2345c397 Added PHP feature check to prevent script from throwing unneeded exceptions on unsupported PHP configurations
Dan
parents: 11
diff changeset
   396
  // really as optimized as it should be due to the logic, but a lot of it's
b5db2345c397 Added PHP feature check to prevent script from throwing unneeded exceptions on unsupported PHP configurations
Dan
parents: 11
diff changeset
   397
  // kinda more or less necessary.
11
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   398
  if ( !is_playing )
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   399
    return true;
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   400
  if ( pulsar_current + pulsar_direction == 10 )
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   401
  {
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   402
    pulsar_direction = -1;
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   403
  }
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   404
  else if ( pulsar_current + pulsar_direction == -1 )
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   405
  {
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   406
    pulsar_direction = 1;
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   407
  }
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   408
  var nc = pulsar_current + pulsar_direction;
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   409
  for ( var i = 0; i < pulsar_tdlist.length; i++ )
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   410
  {
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   411
    $(pulsar_tdlist[i]).rmClass('pulsar' + pulsar_current).addClass('pulsar' + nc);
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   412
  }
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   413
  pulsar_current = nc;
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   414
}
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   415
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   416
addOnloadHook(pulsar_reset);
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   417
setInterval(pulsar_advance, 50);
0faea3a6c881 Fixed some position slider issues; added a pulsing effect to the current track (fun!)
Dan
parents: 10
diff changeset
   418
18
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   419
function updateTitle(artist, album, track)
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   420
{
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   421
  var sep = '';
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   422
  var str = '';
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   423
  if ( track )
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   424
  {
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   425
    str += sep + track;
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   426
    sep = ' - ';
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   427
  }
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   428
  if ( artist )
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   429
  {
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   430
    str += sep + artist;
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   431
    sep = ' - ';
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   432
  }
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   433
  if ( album )
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   434
  {
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   435
    str += sep + album;
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   436
    sep = ' - ';
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   437
  }
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   438
  str += sep + 'AmaroK Playlist';
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   439
  document.title = str;
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   440
}
69af47034212 Added page-titling functionality that changes document.title to match the current track; made position slider reset to zero on stop or playlist end
Dan
parents: 14
diff changeset
   441