User:Splarka/wbfilter.js

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/* Watchlist line filter script, version [0.0.2] 
Originally from http://en.wikipedia.org/wiki/User:Splarka/wbfilter.js

Triggers on watchlists, lets you filter by byte change.
*/

if(wgCanonicalSpecialPageName == 'Watchlist') addOnloadHook(watchlistByteFilter)
function watchlistByteFilter() {
  var obj = document.getElementById('contentSub') || document.getElementById('topbar')
  if(!obj) return;
  var wbf = document.createElement('div');
   wbf.setAttribute('id','wbffrm');
   wbf.style.color = 'black';
   var fs = document.createElement('fieldset');
    var lg = document.createElement('legend');
     lg.appendChild(document.createTextNode('Byte change threshold filter'));
    fs.appendChild(lg);
    var lab1 = document.createElement('label');
     lab1.appendChild(document.createTextNode('Byte threshold '));
     lab1.setAttribute('for','wbfinput1');
    fs.appendChild(lab1);
    var inp1 = document.createElement('input');
     inp1.setAttribute('id','wbfinput1');
     inp1.setAttribute('name','wbfinput1');
     inp1.setAttribute('type','text');
    fs.appendChild(inp1);
    var inp2 = document.createElement('input');
     inp2.setAttribute('id','wbfinput2');
     inp2.setAttribute('name','wbfinput2');
     inp2.setAttribute('type','checkbox');
    fs.appendChild(inp2);
    var lab2 = document.createElement('label');
     lab2.style.fontSize = '200%'
     lab2.appendChild(document.createTextNode(String.fromCharCode(177) + ' '));
     lab2.setAttribute('for','wbfinput2');
    fs.appendChild(lab2);
    var sub1 = document.createElement('input');
     sub1.setAttribute('type','button');
     sub1.setAttribute('value','greater than');
     addClickHandler(sub1,function() { filterWbf(true) });
     sub1.setAttribute('onclick','');
    fs.appendChild(sub1)
    fs.appendChild(document.createTextNode(' '));
    var sub2 = document.createElement('input');
     sub2.setAttribute('type','button');
     sub2.setAttribute('value','less than');
     addClickHandler(sub2,function() { filterWbf(false) });
    fs.appendChild(sub2)
   wbf.appendChild(fs);
  obj.appendChild(wbf);  
}

function filterWbf(greater) {
  var plusminus = document.getElementById('wbfinput2').checked;
  var bt = parseInt(document.getElementById('wbfinput1').value);
  var docobj = document.getElementById('bodyContent') || document.getElementById('content') || document.body
  var pos = getElementsByClassName(docobj,'*','mw-plusminus-pos');
  var neg = getElementsByClassName(docobj,'*','mw-plusminus-neg'); 
  var nul = getElementsByClassName(docobj,'*','mw-plusminus-null'); 
  var posneg = pos.concat(neg).concat(nul);

  for(var i=0;i<posneg.length;i++) posneg[i].parentNode.style.backgroundColor = ''

  if(plusminus) {
    spans = posneg;
  } else if(bt > 0) {
    spans = pos.concat(nul);
  } else if(bt < 0) {
    spans = neg.concat(nul);
  } else {
    alert('bad input');
    return;
  }
  for(var i=0;i<spans.length;i++) {
    spans[i].parentNode.style.backgroundColor = '';
    var val = gettext(spans[i]);
    val = parseInt(val.replace(/[^\d+-]/ig,''));
    if((Math.abs(val) > Math.abs(bt) && greater) || (Math.abs(val) < Math.abs(bt) && !greater)) { 
      spans[i].parentNode.style.backgroundColor = '#ffff99';
    }
  }
}

function gettext(object) {
  if (object.nodeType == 3) return object.nodeValue;
  var txt = [];
  var i=0;
  while(object.childNodes[i]) {
    txt[txt.length] = gettext(object.childNodes[i]);
    i++;
  }
  return txt.join('');
}