scripts/ajax.js
author Dan
Sun, 23 Mar 2008 23:17:06 -0400
changeset 7 3ba432f8390b
parent 6 5f35ebc4f9bb
child 10 d3059e20b0fa
permissions -rw-r--r--
Modified to fit Amarok script specifications.
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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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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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        }
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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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        {
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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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          }
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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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        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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        if ( is_playing )
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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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        }
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        if ( first_load )
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        {
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          first_load = false;
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          var top = $('track_' + current_track).Top() - 138;
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          window.scroll(0, top);
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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;
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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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        }
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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 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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      }
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    });
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}
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function update_clock()
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{
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  var str = secs_to_string(current_track_pos) + '/' + secs_to_string(current_track_length);
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  $('playmeter').object.innerHTML = str;
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  current_track_pos++;
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}
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function secs_to_string(time)
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{
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  var count_seconds = time % 60;
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  var count_minutes = ( time - count_seconds ) / 60;
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  return fill_zeroes(count_minutes) + ':' + fill_zeroes(count_seconds);
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}
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function fill_zeroes(str, len)
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{
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  if ( !len )
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    len = 2;
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  if ( typeof(str) == 'number' && str == 0 )
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    str = '0';
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  str = String(str);
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  while ( str.length < len )
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  {
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    str = '0' + str;
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  }
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  return str;
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}
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window.onload = refresh_playlist;
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setInterval(refresh_playlist, 10000);
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