/*
 * A very simple script to filter a table according to search criteria
 *
 * http://leparlement.org/filterTable
 * See also http://www.vonloesch.de/node/23
 */
function filterTable(term, table) {
  dehighlight(table);
  var terms = term.value.toLowerCase().split(" ");

  for (var r = 1; r < table.rows.length; r++) {
    var display = '';
    for (var i = 0; i < terms.length; i++) {
      if (table.rows[r].innerHTML.replace(/<[^>]+>/g, "").toLowerCase()
        .indexOf(terms[i]) < 0) {
        display = 'none';
      } else {
        if (terms[i].length) highlight(terms[i], table.rows[r]);
      }
      table.rows[r].style.display = display;
    }
  }
}


/*
 * Transform back each
 * <span>preText <span class="highlighted">term</span> postText</span>
 * into its original
 * preText term postText
 */
function dehighlight(container) {
  for (var i = 0; i < container.childNodes.length; i++) {
    var node = container.childNodes[i];

    if (node.attributes && node.attributes['class']
      && node.attributes['class'].value == 'highlighted') {
      node.parentNode.parentNode.replaceChild(
          document.createTextNode(
            node.parentNode.innerHTML.replace(/<[^>]+>/g, "")),
          node.parentNode);
      // Stop here and process next parent
      return;
    } else if (node.nodeType != 3) {
      // Keep going onto other elements
      dehighlight(node);
    }
  }
}

/*
 * Create a
 * <span>preText <span class="highlighted">term</span> postText</span>
 * around each search term
 */
function highlight(term, container) {
  for (var i = 0; i < container.childNodes.length; i++) {
    var node = container.childNodes[i];

    if (node.nodeType == 3) {
      // Text node
      var data = node.data;
      var data_low = data.toLowerCase();
      if (data_low.indexOf(term) >= 0) {
        //term found!
        var new_node = document.createElement('span');

        node.parentNode.replaceChild(new_node, node);

        var result;
        while ((result = data_low.indexOf(term)) != -1) {
          new_node.appendChild(document.createTextNode(
                data.substr(0, result)));
          new_node.appendChild(create_node(
                document.createTextNode(data.substr(
                    result, term.length))));
          data = data.substr(result + term.length);
          data_low = data_low.substr(result + term.length);
        }
        new_node.appendChild(document.createTextNode(data));
      }
    } else {
      // Keep going onto other elements
      highlight(term, node);
    }
  }
}

function create_node(child) {
  var node = document.createElement('span');
  node.setAttribute('class', 'highlighted');
  node.attributes['class'].value = 'highlighted';
  node.appendChild(child);
  return node;
}

/*
 * Here is the code used to set a filter on all filterable elements, usually I
 * use the behaviour.js library which does that just fine
 */
tables = document.getElementsByTagName('table');
for (var t = 0; t < tables.length; t++) {
  element = tables[t];

  if (element.attributes['class']
    && element.attributes['class'].value == 'filterable') {

    /* Here is dynamically created a form */
    var form = document.createElement('form');
    form.setAttribute('class', 'filter');
    // For ie...
    form.attributes['class'].value = 'filter';
    var input = document.createElement('input');
    input.onkeyup = function() {
      filterTable(input, element);
    }
    form.appendChild(input);
    element.parentNode.insertBefore(form, element);
  }
}